1 Noteworthy changes in release ?.? (????-??-??)
2 ==============================================
5 * Implemented -DD and -DDD options that move strace into a separate
6 process group and session, respectively.
9 * Fixed -b execve when --seccomp-bpf option is specified.
10 * Fixed build on no-MMU architectures.
11 * Fixed build on antique systems that do not provide necessary definitions
12 of AUDIT_ARCH_* constants.
14 Noteworthy changes in release 5.3 (2019-09-25)
15 ==============================================
18 * Implemented usage of seccomp-bpf for stopping tracees only for filtered
19 syscalls. Use --seccomp-bpf option to enable.
20 * Implemented decoding of pidfd_open and clone3 syscalls.
21 * Enhanced decoding of io_cancel, io_submit, s390_sthyi, and syslog syscalls.
22 * Enhanced decoding of NETLINK_ROUTE protocol.
23 * Implemented decoding of UNIX_DIAG_UID netlink attribute.
24 * Implemented decoding of WDIOC_* ioctl commands.
25 * Enchanced syscall count statistics: overhead is now applied per-call,
26 added ability for sorting on errors field.
27 * Syscall delay injection and overhead values can now be supplied with
28 time measure unit suffix and provided in IEEE 754 floating point format.
29 * Updated lists of AUDIT_*, BPF_*, ETH_*, KEYCTL_*, KVM_*, MAP_*, SO_*, TCP_*, V4L2_*,
30 XDP_*, and *_MAGIC constants.
31 * Updated lists of ioctl commands from Linux 5.3.
32 * Enhanced manual page.
35 * Fixed syscall tampering on arc, avr32, csky, ia64, m68k, metag, mips,
36 nios2, or1k, riscv, s390, s390x, sparc, sparc64, and tile architectures
37 when PTRACE_GET_SYSCALL_INFO is in use.
38 * Fixed decoding of sockaddr_hci (AF_BLUETOOTH) addresses that lack
40 * Fixed evdev ioctl bitset decoding.
41 * Fixed tests on alpha with Linux kernel headers 5.1+.
44 * Removed support for decoding syscalls in range [1024...1079] on AArch64
45 architecture as this range has never been implemented in mainline kernel
48 Noteworthy changes in release 5.2 (2019-07-12)
49 ==============================================
52 * Implemented syscall return status filtering with -e status=set option
53 and its aliases: -z (limit syscall printing to successful syscalls only)
54 and -Z (limit syscall printing to failed syscalls only). Addresses Debian
56 * Implemented decoding of open_tree, move_mount, fsopen, fsconfig, fsmount,
58 * Enhanced decoding of bpf, clone, inotify_init, mbind, and set_mempolicy
60 * Updated lists of AT_*, AUDIT_*, BPF_*, CLONE_*, ETH_*, KEY_*, KVM_*, MPOL_*,
61 TIPC_*, and V4L2_* constants.
62 * Updated lists of ioctl commands from Linux 5.2.
65 * Fixed syscall tampering on powerpc and powerpc64 when
66 PTRACE_GET_SYSCALL_INFO is in use.
67 * Fixed build with cutting-edge toolchain.
69 Noteworthy changes in release 5.1 (2019-05-22)
70 ==============================================
73 * Fixed decoding of last two arguments of clone syscall on riscv.
76 * Added C-SKY architecture support.
77 * Implemented decoding of SO_TIMESTAMP*_NEW control messages.
78 * Implemented decoding of clock_gettime64, clock_settime64, clock_adjtime64,
79 clock_getres_time64, clock_nanosleep_time64, timer_gettime64,
80 timer_settime64, timerfd_gettime64, timerfd_settime64, utimensat_time64,
81 pselect6_time64, ppoll_time64, io_pgetevents_time64, recvmmsg_time64,
82 mq_timedsend_time64, mq_timedreceive_time64, semtimedop_time64,
83 rt_sigtimedwait_time64, futex_time64, sched_rr_get_interval_time64,
84 pidfd_send_signal, io_uring_setup, io_uring_enter, and io_uring_register
86 * Enhanced decoding of bpf syscall.
87 * Wired up getegid, geteuid, getppid, io_pgetevents, statfs64, and fstatfs64
89 * Wired up kexec_file_load and migrate_pages syscalls on arm.
90 * Wired up io_pgetevents, perf_event_open, seccomp, and statx syscalls
92 * Wired up seccomp syscall on m68k.
93 * Wired up statx syscall on sh.
94 * Wired up pkey_mprotect, pkey_alloc, and pkey_free syscalls on alpha, hppa,
95 ia64, m68k, s390, s390x, sh, sparc, and sparc64.
96 * Wired up rseq syscall on alpha, hppa, ia64, m68k, sh, sparc, sparc64,
98 * Wired up direct ipc syscalls on m68k, mips o32, powerpc, powerpc64,
99 s390, s390x, sh, sparc, sparc64, and x86.
100 * Updated lists of BPF_*, FAN_*, F_SEAL_*, IPV6_*, NT_*, PR_SPEC_*, SO_*,
101 and V4L2_* constants.
102 * Updated lists of ioctl commands from Linux 5.1.
104 Noteworthy changes in release 5.0 (2019-03-19)
105 ==============================================
107 * Changes in behavior
108 * -D option now implies -I4: by default strace ignores SIGHUP, SIGINT,
109 SIGQUIT, SIGPIPE, SIGTERM, SIGTTIN, SIGTTOU, and SIGTSTP when -D option
111 * Diagnostic message is no longer printed if an attempt to restart a process
112 has failed with ESRCH. (Addresses RHBZ bug #1662936.)
113 * ASCII dump no longer tries to read the whole buffer at once. As result,
114 it can fail with a diagnostic message after dumping only a part.
115 Amount of preceding zeroes printed for offset is now chosen in a way
116 to accommodate all the digits of all the offsets being printed.
119 * Changed the way tracees are handled: all pending tracees are now waited for
120 before further processing, this improves fairness of tracee processing.
121 (Addresses RHBZ bugs #478419, #526740, #851457, #1609318, #1610774,
122 and maybe some others.)
123 * Enhanced xlat styles support configured by -X option.
124 * Enhanced decoding of bpf syscall.
125 * Enhanced decoding of PTRACE_PEEKUSER and PTRACE_POKEUSER on hppa.
126 * Enhanced pid formatting in strace-log-merge output.
127 * Wired up kexec_file_load and rseq syscalls on aarch64, arc, metag, nios2,
128 or1k, riscv, and tile architectures.
129 * Updated lists of BPF_*, BTRFS_*, FAN_*, IFLA_*, KERN_*, KVM_CAP_*, NDA_*,
130 NETNSA_*, NT_*, PR_*, REL_*, SECCOMP_*, SCTP_*, UDP_*, V4L2_*, and *_MAGIC
132 * Updated lists of ioctl commands from Linux 5.0.
135 * Fixed ordering of sockaddr_in6 fields.
136 * Fixed strace-k test on alpha.
137 * Fixed build on mips o32.
138 * Fixed build on NOMMU architectures.
139 * Fixed build in --with-libiberty=yes mode.
140 * Fixed potential NULL dereference during printing of line continuation
141 for syscalls that haven't been decoded.
142 * Fixed strace-log-merge error diagnostics.
144 Noteworthy changes in release 4.26 (2018-12-26)
145 ===============================================
148 * The test suite is now provided under the terms of
149 the GNU General Public License version 2 or later.
150 * All the rest of strace is now provided under the terms of
151 the GNU Lesser General Public License version 2.1 or later.
153 * Changes in behavior
154 * If strace is interrupted by a signal it handles (currently
155 one of HUP, INT, QUIT, PIPE, or TERM), strace terminates
156 itself with this signal.
159 * Implemented obtainment of system call information using
160 PTRACE_GET_SYSCALL_INFO ptrace API.
161 * Implemented decoding of PTRACE_GET_SYSCALL_INFO ptrace request.
162 * Implemented decoding of BLKGETZONESZ, BLKGETNRZONES, and RND* ioctl
164 * Enhanced xlat styles support configured by -X option.
165 * Enhanced internet address formatting in structureless contexts.
166 * Enhanced decoding of getsockopt SO_ERROR option.
167 * Enhanced error diagnostics when the first exec fails.
168 * Added %net as a short form of %network in syscall specifications.
169 * Updated lists of ABS_*, BPF_*, FAN_*, IFA_*, IFLA_*, KVM_CAP_*, NETLINK_*,
170 NTF_*, PR_SPEC_*, REL_*, SOL_*, TCA_*, and V4L2_* constants.
171 * Updated lists of ioctl commands from Linux 4.20.
172 * Enhanced manual page.
175 * Fixed "xlat_idx: Unexpected xlat value 0" warnings.
176 * Fixed sthyi output format on s390.
177 * Documented -X option in strace -h output.
179 Noteworthy changes in release 4.25 (2018-10-30)
180 ===============================================
183 * Implemented decoding of KVM_CHECK_EXTENSION and NBD_* ioctl commands.
184 * Implemented decoding of SOL_XDP socket option names.
185 * Implemented decoding of AF_PACKET protocols in socket syscall.
186 * Implemented decoding of AF_AX25 and AF_X25 addresses, protocols,
188 * Implemented stack trace printing on receiving signals.
189 * Enhanced xlat styles support configured by -X option.
190 * Enhanced decoding of IFLA_*, NETCONFA_*, and SMC_DIAG_* netlink attributes.
191 * Wired up io_pgetevents syscall on arm, sparc, and sparc64.
192 * Updated lists of AF_*, AUDIT_*, BPF_*, IFLA_*, IN_*, IPSTATS_*,
193 IPV4_DEVCONF_*, NT_*, SCTP_*, SO_*, SOCK_*, SOL_*, and V4L2_* constants.
194 * Updated lists of ioctl commands from Linux 4.19.
197 * Fixed decoding of bit sets in evdev ioctl commands.
198 * Fixed decoding of EVIOCGBIT(0, ...) ioctl commands.
199 * Fixed test suite for the case when mlockall and unimplemented syscalls
200 are explicitly disabled by a seccomp filter.
202 Noteworthy changes in release 4.24 (2018-08-14)
203 ===============================================
206 * Implemented decoding of kvm vcpu exit reason (-e kvm=vcpu option),
207 requires Linux kernel version 4.16.0 or higher.
208 * Implemented decoding of KVM_SET_CPUID2 and KVM_GET_*_CPUID ioctl commands.
209 * Enhanced decoding of corner cases of SO_LINGER, SO_PEERCRED,
210 and PACKET_STATISTICS getsockopt options.
211 * Wired up io_pgetevents and rseq syscalls on hppa, microblaze, mips, powerpc,
213 * Updated lists of AUDIT_*, BPF_*, IFA_*, IFLA_*, RTA_*, RTPROT_*, TCP_*,
214 TRAP_*, and UDP_* constants.
215 * Updated lists of ioctl commands from Linux 4.18.
218 * Fixed decoding of Q_XGETQSTAT on non-native personalities.
219 * Fixed race condition in aio test.
220 * Fixed build with Bionic libc.
221 * Fixed build with glibc-2.28.
222 * Fixed build in exotic systemd-nspawn based environments.
223 * Fixed build on s390 with kernel headers that do not contain Linux commit
226 Noteworthy changes in release 4.23 (2018-06-14)
227 ===============================================
229 * Changes in behaviour
230 * On x32 personality, 64-bit syscalls (such as readv) are now shown with "#64"
231 suffix instead of "64:" prefix. Unlike the old names, these new names
232 can be used in syscall qualification expressions.
233 * Changed error number output format: error numbers are consistently
234 printed as "-1 ECONST (Error description)"
235 for known errors and as "-1 (errno 123)" for unknown errors,
236 regardless of -e raw qualification settings. One can specify
237 -X raw for displaying raw error numbers unconditionally.
238 * Unfetchable addresses inside arrays are now printed as comments.
239 * Obsolete IA-32 mode syscall names are no longer printed on ia64.
242 * Implemented libdw backend for -k option, configured at build time
243 using --with-libdw option.
244 Whether -k option is compiled is now configured at build time
245 using --enable-stacktrace option.
246 * Added -X option for configuring xlat output formatting (addresses
248 * Added support for personality designation ("64", "32", or "x32") to syscall
249 qualifications in -e trace expressions.
250 * Implemented injection of syscalls with no side effects as an alternative
251 to injection of an invalid syscall (-e inject=SET:syscall= expression).
252 * Improved support for reproducible builds (addresses Debian bug #896016).
253 * Implemented decoding of BPF_PROG_QUERY and BPF_RAW_TRACEPOINT_OPEN bpf
255 * Implemented decoding of INOTIFY_IOC_SETNEXTWD and PERF_EVENT_IOC_* ioctl
257 * Implemented decoding of PR_GET_SPECULATION_CTRL and PR_SET_SPECULATION_CTRL
258 prctl syscall options.
259 * Enhanced decoding of bpf, getsockopt, setsockopt, and socket syscalls.
260 * Enhanced decoding of NETLINK_KOBJECT_UEVENT and NETLINK_ROUTE protocols.
261 * Enhanced decoding of *_DIAG_MEMINFO netlink attributes.
262 * Enhanced decoding of BTRFS_*, FS_IOC_*, SIOCGIFHWADDR, and SIOCSIFHWADDR
264 * Enhanced decoding of AF_BLUETOOTH socket addresses.
265 * Implemented decoding of io_pgetevent syscall.
266 * Wired up rseq syscall.
267 * Updated lists of ADJ_*, BPF_*, BPF_F_*, BPF_PROG_TYPE_*, ETH_P_*, FPE_*,
268 IFF_*, IPPROTO_*, MAP_*, MS_*, MSG_*, NETLINK_*, PACKET_*, PROT_*, SCTP_*,
269 SECCOMP_FILTER_FLAG_*, SEGV_*, SEM_*, SHM_*, SW_*, V4L2_CID_*,
270 V4L2_CTRL_CLASS_*, and V4L2_PIX_FMT_* constants.
271 * Updated lists of ioctl commands from Linux 4.17.
274 * Fixed decoding of msgtyp argument of msgrcv syscall.
275 * Fixed fallback definitions for F_*, MCL_*, MSG_ZEROCOPY, SI_*,
276 and SOL_SOCKET constants.
277 * Fixed -e trace=%pure expression on mips.
279 Noteworthy changes in release 4.22 (2018-04-05)
280 ===============================================
282 * Changes in infrastructure
283 * The mailing list was moved to strace-devel@lists.strace.io.
284 * SourceForge git repository
285 (https://sourceforge.net/p/strace/code/ci/master/tree/) is no longer
286 maintained. Please use GitLab (https://gitlab.com/strace/strace/)
287 or GitHub (https://github.com/strace/strace/) repository instead.
289 * Changes in behaviour
290 * When printing string data, '8' and '9' following an octal escape sequence
291 no longer lead to unabbreviated octal escape sequence output, as they used
293 * Angle brackets are now printed as octal number escape sequences
294 in the output of paths associated with file descriptors.
295 * Data dump for write syscalls (-e write) is performed regardless
296 of successfulness of these syscall (addresses Debian bug #436284).
297 * -r and -t options are now affect output independently. Previously,
298 -r option led to ignoring of the -t option (addresses Debian bug #466195).
301 * Implemented delay injection (-e inject=SET:delay_enter= and
302 -e inject=SET:delay_exit= options).
303 * Added -A option for opening output files in append mode
304 (addresses Debian bug #528488).
305 * IPv6 addresses shown in socket information in -yy mode are now printed
307 * Enhanced decoding of bpf, prctl and ptrace syscalls.
308 * Enhanced decoding of BTRFS_IOC_INO_PATHS, BTRFS_IOC_LOGICAL_INO, and PTP_*
310 * Enhanced NETLINK_ROUTE protocol decoding.
311 * Updated lists of signal codes.
312 * Updated lists of BPF_*, BTN_*, ETH_P_*, INET_DIAG_BC_*, KEY_*, POLL*, RWF_*,
313 SCHED_FLAG_*, SCTP_* and error constants.
314 * Implemented block/character device number printing in -yy mode.
315 * Known pixel/SDR format names are printed as comments for pixelformat fields
317 * Enhanced decoding of kern_features syscall.
318 * Enhanced NETLINK_NETFILTER netlink protocol decoder.
319 * Optimized handling of large number of tracees.
320 * Improved wall clock time measurement in syscall count statistics
322 * Extended the range of allowed values in -e inject=...:retval= expression.
323 * Added i18n support.
324 * Updated lists of ioctl commands from Linux 4.16.
325 * Enhanced manual page.
328 * Fixed build on m68k.
329 * Fixed v4l2 pixelformat decoding on big-endian architectures.
332 Noteworthy changes in release 4.21 (2018-02-13)
333 ===============================================
335 * Changes in behaviour
336 * Warning is now issued when -F option is used.
337 * Warning is now issued when a tracee with unsupported personality
339 * Unknown syscall numbers are now printed in hexadecimal form.
342 * Implemented decoding of netlink descriptor attributes as file descriptors.
343 * Implemented decoding of hugetlb page size selection flags.
344 * Implemented decoding of BPF_PROG_TEST_RUN, BPF_PROG_GET_NEXT_ID,
345 BPF_MAP_GET_NEXT_ID, BPF_PROG_GET_FD_BY_ID, BPF_MAP_GET_FD_BY_ID,
346 and BPF_OBJ_GET_INFO_BY_FD commands of bpf syscall.
347 * Enhanced decoding of get_thread_area, memfd_create, modify_ldt,
348 perf_event_open, reboot, s390_guarded_storage, s390_pcio_mmio_read,
349 s390_pci_mmio_write, s390_runtime_instr, s390_sthyi, set_thread_area,
351 * Implemented decoding of KVM_* and DM_LIST_DEVICES ioctl commands.
352 * Implemented decoding of riscv_flush_icache syscall.
353 * Enhanced decoding of getsockopt and setsockopt syscalls for SOL_NETLINK
355 * Enhanced decoding of BPF_MAP_CREATE command of bpf syscall.
356 * Print values returned by mq_open syscall and first arguments
357 of mq_getsetattr, mq_notify, mq_timedreceive, and mq_timedsend syscalls
359 * Added decoding of get_tls syscall on arm.
360 * Added -e trace=%pure option for tracing system calls with no arguments that
362 * Updated lists of IPV6_*, MAP_*, MEMBARRIER_CMD_*, MSG_*, NT_*, PKEY_*,
363 SHM_*, and TCP_* constants.
364 * Added manual page for the strace-log-merge command.
365 * Updated lists of ioctl commands from Linux 4.15.
366 * Implemented biarch support for s390x.
367 * Implemented an optional support for symbol demangling in strace -k output
368 (activated by --with-libiberty configure option).
369 * Information about availability of demangling and reliable personality
370 decoding (on architectures with multiple personalities) is now available
372 * Added decoding of pkey_alloc, pkey_free, and pkey_mprotect syscalls on
373 powerpc and powerpc64.
374 * Enhanced manual page.
377 * Fixed multi-personality support in cross builds.
378 * Added mq_getsetattr, mq_notify, mq_open, mq_timedreceive, and mq_timedsend
379 syscalls to %desc tracing set.
380 * Fixed path tracing support for mmap syscalls with indirect arguments and
381 for old select syscall.
382 * Fixed decoding of arm-specific (__ARM_NR_*) syscalls.
383 * Fixed open mode flags decoding.
384 * Fixed corner cases in handling of strace -ff -ttt logs by strace-log-merge.
385 * Error counts that exceed one billion are now printed correctly in call
387 * Fixed call summary header for x32 personality.
388 * Changes of tracee personalities are reported more reliably.
389 * Fixed the case when strace attaches to a tracee being inside exec and its
390 first syscall stop is syscall-exit-stop instead of syscall-enter-stop,
391 which messed up all the syscall state tracking.
392 * Fixed printing of higher 32 bits of the return value for x32 personality.
395 * A C compiler that supports "for" loop initial declarations is now required.
396 * Inability to configure multiple personality support on architectures where
397 multiple personalities are supported leads to configuration failure during
398 build now. Use --enable-mpers=check to revert to the old behaviour.
399 * Build-time requirement for the mpers support has been lowered from gawk 4
401 * Removed incomplete and non-functional support for the CRIS architecture.
402 * Removed incomplete and unused support for IA-32 mode on the IA-64
405 Noteworthy changes in release 4.20 (2017-11-13)
406 ===============================================
409 * Implemented decoding of NETLINK_NETFILTER netlink message types and flags.
410 * Implemented decoding of SECCOMP_GET_ACTION_AVAIL operation of seccomp
412 * Updated lists of ARPHRD_*, BPF_*, ETH_P_*, LOOP_*, MADV_*,
413 MEMBARRIER_CMD_*, MFD_*, SECCOMP_*, SO_*, SOL_*, TCP_*, and UFFD_FEATURE_*
415 * Added decoding of statx syscall on hppa.
416 * Updated lists of ioctl commands from Linux 4.14.
419 * Fixed powerpc personality support on powerpc64.
421 Noteworthy changes in release 4.19 (2017-09-05)
422 ===============================================
424 * Changes in behaviour
425 * Changed formatting of personality names on tile architecture in order
426 to make it in line with other multi-personality architectures.
427 * Changed field output order in struct v4l2_requestbuffers to improve in/out
429 * Changed handling of multiple signal= specifications in an injection
430 expression: multiple specification now leads to error instead of implicit
431 usage the last specification.
434 * Enhanced decoding of optlen argument of getsockopt syscall.
435 * Enhanced decoding of SO_LINGER option of getsockopt and setsockopt syscalls.
436 * Enhanced decoding of SO_PEERCRED option of getsockopt syscall.
437 * Enhanced decoding of IP_ADD_MEMBERSHIP, IP_DROP_MEMBERSHIP,
438 IPV6_ADD_MEMBERSHIP, IPV6_DROP_MEMBERSHIP, IPV6_JOIN_ANYCAST,
439 IPV6_LEAVE_ANYCAST, MCAST_JOIN_GROUP, and MCAST_LEAVE_GROUP options
440 of setsockopt syscall.
441 * Enhanced decoding of KEYCTL_DH_COMPUTE operation of keyctl syscall
442 (KDF parameters decoding).
443 * Implemented decoding of KEYCTL_RESTRICT_KEYRING operation of keyctl syscall.
444 * Enhanced decoding of UFFDIO_API ioctl command.
445 * Enhanced decoding of BPF_PROG_LOAD, BPF_MAP_CREATE, BPF_MAP_LOOKUP_ELEM,
446 and BPF_MAP_GET_NEXT_KEY commands of bpf syscall.
447 * Implemented decoding of linux socket filter programs specified
448 for SO_ATTACH_FILTER and SO_ATTACH_REUSEPORT_CBPF socket options.
449 * Implemented decoding of inet_diag_req_v2, inet_diag_req_compat,
450 packet_diag_msg, and smc_diag_msg netlink attributes of NETLINK_SOCK_DIAG.
451 * Implemented NETLINK_SELINUX protocol specific decoding.
452 * Implemented decoding of netlink message ack flags.
453 * Implemented decoding of nlmsgerr netlink attributes.
454 * Implemented basic protocol specific decoding of NETLINK_CRYPTO.
455 * Implemented decoding of crypto_user_alg netlink attributes
457 * Implemented basic protocol specific decoding of addr, addrlabel, dcb, link,
458 mdb, neigh, neightbl, netconf, nsid, route, rule, tc, and tca messages
460 * Implemented decoding of NETLINK_KOBJECT_UEVENT messages.
461 * Improved handling of unexpected tracees (the ones that cloned with
462 CLONE_PARENT/CLONE_PTRACE or called PTRACE_TRACEME on themselves): they
463 are now PTRACE_DETACH'ed instead of PTRACE_CONT'ed.
464 * Updated lists of BPF_*, KEY_*, RWF_*, SCM_*, SO_*, and *_MAGIC constants.
465 * Added decoding of arch_prctl syscall on x86.
466 * Added decoding of seccomp, bpf, userfaultfd, membarrier, mlock2,
467 copy_file_range, preadv2, pwritev2, and statx on alpha.
468 * Added decoding of statx syscall on microblaze.
469 * Added decoding of s390_guarded_storage syscall on s390.
470 * Updated lists of ioctl commands from Linux 4.13.
471 * Enhanced manual page.
474 * Fixed printing of group_req structure on non-native personalities.
475 * Fixed output formatting of blkpg_ioctl_arg, dm_name_list, and iocb
477 * Fixed formatting of nul-terminated strings which have kernel-imposed size
479 * Fixed printing of paths that hit PATM_MAX limit in order to match kernel's
481 * Fixed build warnings on Android mips64.
482 * Fixed unused function "is_negated_errno" build warning when built
484 * Fixed syscall number and arguments retrieval behaviour on sparc64 and
485 mips o32 after prctl(PR_SET_DUMPABLE, 0) makes PTRACE_PEEKTEXT impossible
486 to use if Linux kernel has commit v4.10-rc1~114^2~2.
487 * Fixed path tracing for execveat, symlink, symlinkat, inotify_add_watch,
488 and inotify_init syscalls.
489 * Fixed personality switch printing on sparc64 and risc-v.
491 Noteworthy changes in release 4.18 (2017-07-05)
492 ===============================================
495 * Implemented decoding of SCM_TIMESTAMP* control messages.
496 * Implemented decoding of netlink NLMSG_DONE messages.
497 * Implemented decoding of netlink generic nlmsg_type and nlmsg_flags.
498 * Implemented decoding of NETLINK_AUDIT, NETLINK_NETFILTER, NETLINK_ROUTE,
499 NETLINK_SELINUX, NETLINK_SOCK_DIAG, and NETLINK_XFRM message types.
500 * Implemented decoding of NETLINK_GENERIC protocol families.
501 * Implemented basic protocol specific decoding of AF_INET, AF_INET6,
502 AF_NETLINK, AF_PACKET, AF_SMC, and AF_UNIX messages of NETLINK_SOCK_DIAG.
503 * Implemented basic decoding of netlink attributes.
504 * Implemented basic protocol specific decoding of AF_INET, AF_NETLINK,
505 AF_PACKET, AF_SMC, and AF_UNIX netlink attributes of NETLINK_SOCK_DIAG.
506 * Implemented decoding of inet_diag_msg, netlink_diag_msg, and unix_diag_msg
507 netlink attributes of NETLINK_SOCK_DIAG.
508 * Updated lists of ARPHRD_*, KEYCTL_*, NDIAG_SHOW_*, RTM_*, SCM_*, SCTP_*,
509 SO_*, V4L2_*, and prctl ARCH_* constants.
510 * Updated lists of ioctl commands from Linux 4.12.
513 * In interactive mode (-I2), those signals that were blocked at startup
514 will remain blocked for the whole period of strace execution.
515 * strace no longer resets SIGCHLD handler in tracees to the default action.
516 * When traced command is terminated by a blocked signal, strace unblocks
517 that signal to ensure its own termination with the same signal.
518 * Fixed corner cases in decoding of old sigaction syscall.
519 * Fixed build with old kernel headers on mips.
520 * Fixed build on aarch64 and tile with glibc >= 2.26.
521 * Fixed build on arc and nios2.
523 Noteworthy changes in release 4.17 (2017-05-24)
524 ===============================================
526 * Changes in command line syntax
527 * Syscall classes specified in -e trace= option now have % prefix (like
528 -e trace=%process). Old style class names without leading % are still
529 supported, but considered deprecated now.
532 * Optimized syscall filtering.
533 * Improved representation of timestamps.
534 * Enhanced decoding of sched_setattr syscall.
535 * Added -e trace=%stat option for tracing variants of stat syscall.
536 * Added -e trace=%lstat option for tracing variants of lstat syscall.
537 * Added -e trace=%fstat option for tracing variants of fstat and fstatat
539 * Added -e trace=%%stat option for tracing syscalls used for querying file
540 status information (stat, lstat, fstat, fstatat, statx, and their
542 * Added -e trace=%statfs option for tracing statfs, statfs64 and statvfs
544 * Added -e trace=%fstatfs option for tracing fstatfs, fstatfs64 and fstatvfs
546 * Added -e trace=%%statfs option for tracing syscalls used for querying file
547 system statistics information (statfs-like, fstatfs-like and ustat).
548 * Added -e trace=/regex option for filtering syscalls using regular
550 * Added support for prepending of question mark before syscall qualification
551 in -e trace expressions in order to suppress error in case no syscalls
552 matched the provided qualification.
553 * Implemented decoding of signal mask in rt_sigreturn syscall on alpha, arc,
554 arm, avr32, bfin, cris, hppa, m68k, metag, microblaze, mips, nios2, or1k,
555 powerpc, powerpc64, riscv, sh, sh64, sparc, sparc64, tile, x86, and xtensa
557 * Implemented decoding of statx syscall.
558 * Implemented decoding of NS_* ioctl commands.
559 * Implemented decoding of the remaining V4L2_BUF_TYPE_* types.
560 * Implemented decoding of VIDIOC_[SG]_TUNER ioctl commands.
561 * Implemented decoding of NLMSG_ERROR netlink messages.
562 * Improved decoding of BPF_PROG_ATTACH command of bpf syscall.
563 * Improved decoding of misplaced parts in DM_* ioctl commands.
564 * Updated lists of ioctl commands from Linux 4.11.
567 * Fixed decoding of flags argument of preadv2 and pwritev2 syscalls on x32.
568 * Fixed the number of arguments and tracing flags of alpha specific syscalls.
569 * Fixed decoding of old sigsuspend syscall on alpha, cris, mips, powerpc,
570 powerpc64, sh, sh64, sparc, and sparc64.
571 * Fixed decoding of sgetmask and ssetmask syscalls on 64-bit architectures.
572 * Fixed decoding of netlink messages received within struct msghdr.
573 * Worked around a bug in miscompiled aarch64 kernels leading to the 3rd
574 argument of sched_getattr syscall being not quite 32-bit.
575 * Fixed corner cases of printing inaccessible times argument of utimes
576 and futimesat syscalls.
578 Noteworthy changes in release 4.16 (2017-02-14)
579 ===============================================
582 * Implemented syscall return value injection (-e inject=SET:retval= option).
583 * Implemented signal injection (-e inject=SET:signal= option).
584 * Implemented decoding of SUID_DUMP_* constants in PR_[GS]ET_DUMPABLE.
585 * Implemented decoding of all SG_* ioctl commands.
586 * Implemented decoding of ustat syscall.
587 * Implemented decoding of BPF_OBJ_PIN, BPF_OBJ_GET, BPF_PROG_ATTACH,
588 and BPF_PROG_DETACH commands of bpf syscall.
589 * Enhanced decoding of sg_io_hdr and sg_io_v4 structures.
590 * Enhanced decoding of get_robust_list, getrandom, io_submit, set_robust_list
592 * Enhanced decoding of entities of kernel long type on x32 and mips n32 ABIs.
593 * Updated lists of IP_*, IPV6_*, and LOOP_* constants.
594 * Updated lists of ioctl commands from Linux 4.10.
595 * Added decoding of recently added syscalls on avr32, microblaze, ppc,
599 * Fixed pathmatch of oldselect syscall on 64-bit architectures.
600 * Fixed decoding of mmap2 syscall on s390 when arguments are not available.
601 * Fixed decoding of kexec_file_load, mprotect, pkey_mprotect, prctl, preadv*,
602 and pwritev* syscalls on x32.
603 * Fixed printing of string arguments of getxattr and setxattr syscalls
604 when -s option is used to limit the printed string size.
605 * Fixed decoding of ifconf, ifreq, and loop_info structures on non-native
607 * Fixed decoding of SG_* and LOOP_* ioctl commands.
608 * Fixed build on mips with musl libc.
609 * Fixed cross-building of ioctlsort.
610 * Applied minor formatting fixes to the manual page.
612 Noteworthy changes in release 4.15 (2016-12-14)
613 ===============================================
615 * Changes in behavior
616 * Time stamps are now printed according to ISO 8601.
617 * Changed output format of val3 parameter of futex FUTEX_WAKE_OP operation.
618 * The last argument of mincore, sched_getaffinity, and sched_setaffinity
619 syscalls is now formatted as an array.
622 * Implemented syscall fault injection (-e fault=... option).
623 * Implemented decoding of DM_* ioctl commands.
624 * Implemented decoding of attr parameter of perf_event_open syscall.
625 * Implemented decoding of pkey_alloc, pkey_free, and pkey_mprotect syscalls.
626 * Implemented dumping of mq_timedsend and mq_timedreceive syscalls.
627 * Implemented decoding of PR_SET_FP_MODE and PR_GET_FP_MODE operations
629 * Implemented PTRACE_GETREGS API support on m68k.
630 * Updated lists of ARCH_*, BPF_*, BTRFS_*, FALLOC_*, MS_*, *_MAGIC,
631 and V4L2_* constants.
632 * Updated lists of ioctl commands from Linux 4.9.
633 * Added decoding of recently added syscalls on arc, x32, and xtensa.
634 * Enhanced manual page.
637 * Fixed corner cases in decoding of exit, exit_group, futimesat, getgroups,
638 getresuid, init_module, inotify_init1, kcmp, kexec_load, lookup_dcookie,
639 mq_getsetattr, mq_notify, mq_open, mq_timedreceive, mq_timedsend,
640 name_to_handle_at, prctl, process_vm_readv, process_vm_writev, setfsuid,
641 setgroups, setns, unshare, and utimes syscalls.
642 * Fixed handling of verbose flag in printing of controls array
643 of struct v4l2_ext_controls.
644 * Fixed omission of field names in the output of capability, sigaction,
645 sigevent, statfs, timespec, timeval, and utimbuf structures.
646 * Fixed printing of unknown syscalls in siginfo structure.
647 * Fixed decoding of ioctl constants on m68k.
648 * Fixed cris architecture support.
649 * Fixed cross build when host compiler does not support the same
650 set of warning flags as the cross compiler.
651 * Fixed build on SLE10 and SLE11.
653 Noteworthy changes in release 4.14 (2016-10-04)
654 ===============================================
656 * Changes in behavior
657 * When using -p option without a command and no processes has been attached,
658 strace exits with exit status 1.
661 * Added printing of the mode argument of open and openat syscalls
662 when O_TMPFILE flag is set. (Addresses Fedora bug #1377846).
663 * Enhanced -e abbrev=set, -e raw=set, and -e verbose=set.
664 * Enhanced decoding of futex, keyctl, quotactl, timerfd_settime,
665 and aio family syscalls.
666 * Implemented fetching of the 7th subcall argument on mips o32.
667 * Updated lists of BPF_*, ETH_P_*, KEXEC_ARCH_*, SCTP_*, TCP_*, and *_MAGIC
669 * Updated lists of ioctl commands from Linux 4.8.
670 * Added decoding of new syscalls on sh and sh64.
671 * Added RISC-V architecture support.
674 * Marked io_setup and io_destroy as memory mapping related syscalls.
675 * Fixed leakage of placeholder descriptors to tracees.
676 * Fixed printing of mode_t, umode_t, and umask types.
677 * Fixed decoding of iovec arrays without a limit on total data size.
678 * Fixed decoding of fadvise64, fallocate, futex, keyctl, quotactl, readahead,
679 and ipc family syscalls.
680 * Fixed decoding of invalid syscalls mapped to indirect subcalls.
681 * Fixed decoding of struct btrfs_ioctl_vol_args_v2 on non-native
683 * Fixed decoding of PTRACE_DETACH on sparc and sparc64.
684 * Fixed decoding of struct stat64 on sparc64.
685 * Fixed decoding of uid and gid-related syscalls on sparc64.
686 * Fixed decoding of the forth argument of semctl syscall on sparc64.
687 * Fixed values of tty ioctl constants on sparc64.
688 * Fixed sparc personality support on sparc64.
690 Noteworthy changes in release 4.13 (2016-07-26)
691 ===============================================
694 * Implemented a general netlink socket parser.
695 * Enhanced decoding of socket addresses.
696 * Enhanced decoding of cmsghdr, msghdr, and mmsghdr structures.
697 * Enhanced decoding of accept, accept4, bind, getpeername, getsockname,
698 ipc, recvfrom, recvmsg, recvmmsg, sendto, sendmmsg, and socketcall syscalls.
699 * Updated lists of AF_*, BPF_MAP_TYPE_*, KEY_*, KEYCTL_*, RWF_*, SS_*,
700 and *_MAGIC constants.
701 * Updated lists of ioctl commands from Linux 4.7.
704 * Fixed decoding of pid_t argument of prlimit64 syscall.
705 * Fixed sign extension issues in the parser of struct rusage.
706 * Fixed race condition in decoding of timeout argument of recvmmsg and
707 rt_sigtimedwait syscalls.
708 * Fixed build with fresh linux kernel headers.
710 Noteworthy changes in release 4.12 (2016-05-31)
711 ===============================================
714 * Implemented simultaneous use of -p option and tracing of a command.
715 (addresses Debian bug #549942).
716 * Implemented caching of netlink conversations to reduce amount of time
717 spent in decoding socket details in -yy mode.
718 * Implemented -yy mode decoding of protocol:portid pairs associated with
719 netlink socket descriptors.
720 * Implemented decoding of copy_file_range, preadv2, and pwritev2 syscalls.
721 * Implemented dumping of preadv, preadv2, pwritev, pwritev2, and vmsplice
723 * Implemented decoding of BTRFS_* and UFFDIO_* ioctl commands.
724 * Enhanced decoding of BLK*, EVIOC*, RTC_*, and VIDIOC_* ioctl commands.
725 * Enhanced decoding of fstatfs, fstatfs64, get_mempolicy, getdents,
726 getdents64, getgroups, getpriority, kill, mbind, migrate_pages, mknod,
727 mknodat, personality, poll, ppoll, quotactl, rt_sigpending,
728 rt_sigqueueinfo, rt_sigtimedwait, rt_tgsigqueueinfo, sched_getaffinity,
729 sched_setaffinity, seccomp, set_mempolicy, setgroups, setpriority, statfs,
730 statfs64, tgkill, waitid, and xattr family syscalls.
731 * Enhanced decoding of getxpid, getxuid, and getxgid syscalls on alpha.
732 * Enhanced decoding of pipe syscall on alpha, ia64, mips, sh, and sparc.
733 * Added decoding of bind, listen, and setsockopt direct syscalls on sparc.
734 * Added decoding of osf_statfs64 and osf_fstatfs64 syscalls on alpha.
735 * Added decoding of fadvise64 and fadvise64_64 on s390.
736 * Updated lists of AF_*, BPF_MAP_TYPE_*, CLONE_*, EPOLL*, IPV6_*, MADV_*,
737 MSG_*, PTRACE_*, SEGV_*, SO_*, SOL_*, *_MAGIC, and quotactl constants.
738 * Updated lists of ioctl commands from Linux 4.6.
741 * Fixed build on arc, metag, nios2, or1k, and tile architectures.
742 * Fixed decoding of 32-bit times syscall return value on 64-bit architectures.
743 * Fixed decoding of mlock2 syscall on sparc.
744 * Fixed decoding of osf_shmat syscall on alpha.
745 * Fixed decoding of syscalls unknown to the kernel on s390/s390x.
746 (addresses Debian bug #485979 and Fedora bug #1298294).
747 * Fixed decoding of preadv syscall in case of short read.
748 * Fixed decoding and dumping of readv syscall in case of short read.
749 * Fixed dumping of recvmsg and recvmmsg syscalls in case of short read.
750 * Fixed decoding of mincore syscall's last argument.
751 * Fixed remaining errors in mapping between syscall numbers and numbers
752 of syscall arguments.
753 * Applied various fixes to strace-graph script.
755 Noteworthy changes in release 4.11 (2015-12-21)
756 ===============================================
758 * Changes in behavior
759 * Some syscalls have different names depending on architecture and
760 personality. In these cases, syscall filtering and printing now
761 consistently uses the names that match corresponding __NR_* kernel
762 macros of the tracee's architecture and personality.
763 * Added strace prefix to all diagnostic messages.
766 * Enhanced and extended test suite.
767 * Implemented reliable tracing of processes whose personality differs
768 from the personality of strace, fixed decoding of 32-bit personality
769 syscalls on 64-bit architectures.
770 * When some data referenced by syscall arguments is irrelevant or cannot
771 be read from tracee's memory, strace now prints its address consistently.
772 * When a syscall is restarted using restart_syscall mechanism, strace now
773 shows the syscall name on architectures that expose this information.
774 * Print values returned by epoll_create1, eventfd, eventfd2, fanotify_init,
775 inotify_init1, perf_event_open, pipe, pipe2, signalfd, signalfd4, socket,
776 socketpair, timerfd, and timerfd_create syscalls, as well as F_DUPFD and
777 F_DUPFD_CLOEXEC fcntl commands, as file descriptors.
778 * Optimized decoding of indirect socket syscalls.
779 * Implemented decoding of nanoseconds along with seconds in stat family
780 syscalls (addresses Fedora bug #1251176).
781 * Implemented decoding of struct statfs.f_flags in statfs syscall.
782 * Implemented decoding of siginfo_t.si_syscall and siginfo_t.si_arch
784 * Implemented decoding of indirect syscall on mips o32.
785 * Implemented decoding of IPPROTO_IP control messages.
786 * Implemented decoding of setsockopt syscall multicast arguments.
787 * Enhanced decoding of struct sigevent.
788 * Enhanced decoding of block, loop, mtd, ptp, rtc, SG_IO, socket, tty,
789 and v4l2 ioctl syscall arguments.
790 * Enhanced decoding of epoll_create, fcntl, fcntl64, futex, getdents,
791 getdents64, getsockopt, io_*, mount, msgctl, prctl, quotactl, recvfrom,
792 sendfile, setsockopt, and shmctl syscalls.
793 * Implemented decoding of bpf, execveat, ioperm, iopl, kcmp, kexec_file_load,
794 lookup_dcookie, membarrier, memfd_create, mlock2, name_to_handle_at,
795 open_by_handle_at, sched_getattr, sched_setattr, and userfaultfd syscalls.
796 * Updated lists of AF_*, EPOLL_*, FALLOC_FL_*, F_*, INPUT_PROP_*, IPPROTO_*,
797 IPV6_*, IP_*, KEY_*, LOCK_*, MNT_*, MS_*, PACKET_*, PERF_FLAG_*, PF_*,
798 PR_*, PTRACE_O_*, RENAME_*, SCTP_*, SECBIT_*, SO_*, TCP_*, and siginfo_t
800 * Added Nios II architecture support.
801 * Added new syscall entries to match Linux 4.4.
804 * Fixed potential short read of strings from tracee's memory.
805 * Fixed -qq option in conjunction with -o option.
806 * Fixed filtering of <unavailable> syscalls.
807 * Fixed decoding of ioctl syscall command on aarch64 and 32-bit architectures
808 with 64-bit aligned structures.
809 * Fixed decoding of eventfd2, epoll_create1, signalfd4, and sync_file_range2
810 syscall flags arguments.
811 * Fixed decoding of 4th argument of clock_nanosleep syscall.
812 * Fixed decoding of getpagesize syscall on m68k.
813 * Fixed decoding of getrandom and seccomp syscalls on aarch64.
814 * Fixed decoding of timezone argument of gettimeofday and settimeofday
816 * Fixed decoding of offset argument of mmap2 syscall on arm, sparc,
818 * Fixed decoding of pipe syscall on alpha and mips.
819 * Fixed decoding of pipe2 syscall on ia64, sh, sparc, and sparc64.
820 * Fixed decoding of signal mask argument of pselect6 syscall on x32.
821 * Fixed decoding of signal mask of rt_sigreturn syscall on aarch64, m68k,
823 * Fixed decoding of 4th argument of semctl indirect syscall.
824 * Fixed decoding of sa_restorer and sa_mask of sigaction syscall on m68k.
825 * Fixed decoding of statfs64 and fstatfs64 syscalls on arm eabi.
826 * Fixed decoding of struct dirent on x32.
827 * Fixed decoding of times syscall return value on mips n32 and x32.
828 * Fixed decoding of path argument of umount2 syscall
829 (addresses Debian bug #785050).
830 * Worked around a kernel bug in tracing privileged executables.
831 * Fixed various errors in mapping between syscall numbers and associated
832 information like the number of syscall arguments, the name of syscall,
835 Noteworthy changes in release 4.10 (2015-03-06)
836 ===============================================
839 * Added -yy option to print protocol and address information associated with
841 * Extended "-e read=set" and "-e write=set" options to cover sendmsg,
842 recvmsg, sendmmsg, and recvmmsg syscalls.
843 * Implemented full 32-bit decoding of ioctl commands
844 (addresses Debian bug #692913 and Fedora bug #902788).
845 * Implemented PTRACE_GETREGS API support on ia64.
846 * Implemented PTRACE_GETREGS API support on mips.
847 * Implemented PTRACE_GETREGSET API support on s390/s390x.
848 * Implemented decoding of getrandom and seccomp syscalls.
849 * Implemented full decoding of 64-bit capability sets.
850 * Implemented decoding of all prctl commands.
851 * Implemented decoding of parametrized ioctl commands.
852 * Implemented decoding of evdev ioctl commands.
853 * Implemented decoding of v4l ioctl commands.
854 * Implemented decoding of SG_IO v4 ioctl commands.
855 * Implemented decoding of FIFREEZE/FITHAW/FITRIM ioctl commands.
856 * Implemented decoding of FALLOC_FL_* fallocate flags.
857 * Implemented decoding of rt_sigreturn signal mask on aarch64,
859 * Enhanced socket decoder to support bluetooth sockets.
860 * Enhanced decoding of unlisted ioctl commands.
861 * Enhanced decoding of getsockopt and setsockopt syscall.
862 * Enhanced decoding of sysinfo syscall.
863 * Enhanced decoding of struct cmsghdr.
864 * Enhanced decoding of wait status.
865 * Enhanced aio support on non-x86 architectures by using external libaio.h.
866 * Added O_TMPFILE to the list of recognized open mode flags.
867 * Updated the list of filesystem type constants that is used in decoding
868 statfs family syscalls.
869 * Updated lists of CAP_*, PR_*, PTRACE_*, SCHED_*, SO_*, SOL_*, SWAP_FLAG_*,
871 * Updated lists of signal constants from Linux 3.19.
872 * Updated lists of errno constants from Linux 3.19.
873 * Updated lists of ioctl commands from Linux 3.9.
874 * Added new syscall entries to match Linux 3.19.
877 * Fixed various errors in mapping between syscall numbers and associated
878 information like the number of syscall arguments, the name of syscall,
880 * Fixed quoting issues in printing descriptors, filenames, network interface
881 names, struct utsname members, device/volume names of BLK* ioctl commands.
882 * Fixed uid_t/git_t decoding.
883 * Fixed potential out-of-bounds read issues in getdents/getdents64 decoders.
884 * Fixed potential open flags truncation on some architectures.
885 * Fixed decoding of struct ifreq.ifr_name.
886 * Fixed decoding of SIOCSIFNAME ioctl command.
887 * Fixed decoding of RENAME_* renameat2 flags.
888 * Fixed decoding of UTIME_NOW/UTIME_OMIT timeval structures.
889 * Fixed decoding of indirect ipc subcalls on some architectures.
890 * Fixed decoding of fanotify_mark syscall on 32-bit architectures.
891 * Fixed decoding of 32-bit stat structures on 64-bit architectures.
892 * Fixed decoding of 32-bit struct cmsghdr on 64-bit architectures.
893 * Fixed decoding of 32-bit preadv/pwritev offset on 64-bit architectures.
894 * Fixed decoding of sigreturn/rt_sigreturn signal mask on ia64, ppc, ppc64,
895 sparc, sparc64, mips, and s390.
896 * Fixed instruction pointer output (-i option) on architectures that support
897 several personalities.
898 * Fixed behaviour of "-e read=set" and "-e write=set" when read and write
900 * Fixed build on systems where struct sigaction has no sa_restorer member.
901 * Fixed build with uclibc and musl libc.
904 * Linux kernel >= 2.5.46 is required.
905 Older versions without a decent PTRACE_SETOPTIONS support will not work.
906 * On mips, linux kernel >= 2.6.15 is required.
907 Older versions without a decent PTRACE_GETREGS support will not work.
908 * On s390 and s390x, linux kernel >= 2.6.27 is required.
909 Older versions without a decent PTRACE_GETREGSET support will not work.
911 Noteworthy changes in release 4.9 (2014-08-15)
912 ==============================================
914 * Changes in behavior
915 * Disabled OABI support on ARM EABI systems by default,
916 added --enable-arm-oabi option to enable it at configure time.
919 * Added experimental -k option to print stack trace after each traced syscall.
920 * Added -w option to produce stats on syscall latency.
921 (addresses Debian bug #457497).
922 * Added ARC architecture support.
923 * Added PTRACE_GETREGS API support on PowerPC.
924 * Enhanced Bionic libc and musl libc support.
925 * Enhanced tracing of x86 personality processes on x86_64 and x32.
926 * Enhanced tracing of ARM personality processes on AArch64.
927 * Enhanced 32/64bit personality detection on PowerPC.
928 * Implemented decoding of add_key, ioprio_get, ioprio_set, kexec_load, keyctl,
929 renameat2, and request_key syscalls.
930 * Robustified decoding of select, pselect, and io_submit syscalls.
931 * Enhanced decoding of delete_module, fanotify_init, fanotify_mark, fcntl,
932 setdomainname, sethostname, setns, and sync_file_range syscalls.
933 * Enhanced decoding of signal bitmasks.
934 * Enhanced decoding of file descriptors.
935 * Enhanced siginfo_t decoding.
936 * Enhanced PF_NETLINK decoding.
937 * Updated CLOCK_* constants
938 (addresses Fedora bug #1088455).
939 * Added new syscall entries to match Linux 3.16.
942 * Added shmat and shmdt to the set of memory mapping related syscalls.
943 * Fixed detaching from stopped processes.
944 * Fixed fanotify_mark decoding on 32bit architectures.
945 * Fixed offset decoding in preadv and pwritev syscalls.
946 * Fixed select decoding for glibc in _FORTIFY_SOURCE mode.
947 * Fixed decoding of epoll_ctl syscall with EPOLL_CTL_DEL argument.
948 * Fixed build when <sys/ptrace.h> and <linux/ptrace.h> conflict
949 (addresses Fedora bug #993384).
950 * Miscellaneous corrections in the manual page.
951 (Addresses Debian bug #725987).
953 Noteworthy changes in release 4.8 (2013-06-03)
954 ==============================================
956 * Changes in behavior
957 * In case of normal strace termination, when the trace output is
958 redirected to a pipe, strace now closes it and waits for the pipe
959 process termination before exit.
962 * Implemented tracing using PTRACE_SEIZE API (when available).
963 * Implemented more reliable PTRACE_GETREGSET-based process personality
964 detection on x86-64 and x32 (when available).
965 * Added -e trace=memory option for tracing memory mapping related syscalls.
966 * Documented -b option.
967 * Allowed exit status messages to be suppressed by giving -q option twice.
968 * Added AArch64 architecture support
969 (addresses Debian bug #693074 and Fedora bug #969858).
970 * Added support for OpenRISC 1000, Meta, and Xtensa architectures.
971 * Added tilegx personality support for Tile.
972 * Enhanced support of NOMMU architectures.
973 * Enhanced decoding of getdents, mmap, perf_event_open, ptrace, and
975 * Added new syscall entries to match Linux 3.9.
976 * Regenerated the list of common ioctl names from Linux 3.9.
977 * Updated the list of errno constants.
978 * Updated lists of AF_*, MADV_*, MAP_*, MSG_*, MS_*, PF_*, PR_*,
979 PTRACE_O_*, and TCP_* constants.
980 * Implemented decoding of UBI ioctls.
981 * Removed redundant "*32" ioctl names.
984 * Fixed ERESTARTNOINTR leaking to userspace on ancient kernels
985 (addresses Fedora bug #659382).
986 * Fixed kernel release string parsing
987 (addresses Debian bug #702309).
988 * Fixed decoding of *xattr syscalls
989 (addresses Fedora bug #885233).
990 * Fixed handling of files with 64-bit inode numbers by 32-bit strace
991 (addresses Fedora bug #912790).
992 * Fixed tracing forks on SPARC.
993 * Fixed decoding of fadvise64, fallocate, ftruncate64, io_submit, pread,
994 preadv, pwrite, pwritev, readahead, sigaltstack, sync_file_range, sysctl,
995 and truncate64 syscalls.
996 * Fixed categories of multiple syscalls on most of supported architectures.
997 * Fixed decoding of non-native 32-bit personality recv[m]msg syscalls.
998 * Fixed decoding of multiple 32-bit personality syscalls on x32.
999 * Fixed decoding of long long syscall arguments on ARM, MIPS/o32, PowerPC,
1000 S390x, and Tile architectures.
1001 * Fixed semtimedop decoding on S390x.
1002 * Fixed sram_alloc decoding on Blackfin.
1003 * Fixed build when process_vm_readv is a stab.
1004 * Fixed build with older versions of libaio.h.
1006 Noteworthy changes in release 4.7 (2012-05-02)
1007 ==============================================
1009 * Changes in behavior
1010 * strace no longer suspends waitpid until there is a child
1011 for waitpid'ing process to collect status from.
1012 * strace no longer detaches from a tracee which is supposed
1014 * strace now issues a new message: "+++ exited with EXITCODE +++"
1015 which shows exact moment strace got exit notification,
1016 analogous to existing "+++ killed by SIG +++" message.
1019 * Added x32 personality support (x86_64 architecture).
1020 * Added -y and -P options to print file descriptor paths and
1021 filter by those paths.
1022 * Added -I option to control strace interactivity.
1023 * Allowed -p option to take comma or whitespace-separated list of PIDs.
1024 * Added strace_log_merge script helper to merge timestamped "strace -ff"
1026 * Implemented decoding of clock_adjtime, get_robust_list, migrate_pages,
1027 preadv, prlimit64, process_vm_readv, process_vm_writev, pwritev,
1028 recvmmsg, recvmsg, rt_tgsigqueueinfo, sendmmsg, setns, set_robust_list,
1029 sched_rr_get_interval, splice, syslog, tee and vmsplice syscalls.
1030 * Enhanced decoding of capget, capset, getrlimit, flistxattr, io_submit,
1031 listxattr, setrlimit and swapon syscalls.
1032 * Implemented decoding of loop and mtd ioctls.
1033 * Added syscall entries for new linux syscalls.
1034 * Added syscall entries for direct socket system calls on powerpc.
1035 * Updated the list of errno constants.
1036 * Updated lists of MSG_*, STA_*, and TCP_* constants.
1037 * Regenerated the list of ioctl names from Linux 3.3.
1038 * Enhanced switching between processes with different personalities.
1039 * Enhanced signals reporting by using short signal names.
1040 * Made ERESTART* messages more descriptive.
1041 * Made parsing of numbers from strings more robust.
1042 * Added support for compat_statfs64 and statfs64.f_flags.
1043 * Changed read of data blocks to use single process_vm_readv syscall
1044 (when available) instead of several PTRACE_PEEKDATA operations.
1045 * Changed read of registers on x86 and x86-64 to use single PTRACE_GETREGS
1046 operation instead of several PTRACE_PEEKUSER operations.
1047 * Applied various optimizations to make strace work faster.
1050 * Implemented proper handling of real SIGTRAPs on kernels supporting
1051 PTRACE_O_TRACESYSGOOD.
1052 (Addresses Fedora bug #162774).
1053 * Fixed sockaddr_un.sun_path name in decoded output.
1054 (Addresses Debian bug #554946).
1055 * Fixed to avoid potential core file clobbering on exit.
1056 (Addresses Debian bug #656398).
1057 * Fixed a typo in documentation.
1058 (Addresses Debian bug #653309).
1059 * Fixed decoding of timer id returned by timer_create.
1060 * Fixed epoll_create1, epoll_wait and epoll_pwait decoding.
1061 * Fixed *at syscalls flags decoding.
1062 * Fixed ARM EABI 64-bit syscall's arguments decoding.
1063 * Fixed semtimedop decoding on s390.
1064 * Fixed osf_sigprocmask decoding on alpha.
1065 * Fixed ipc and socket subcall decoding on several architectures.
1066 * Corrected syscall entries for epoll_pwait, epoll_create, epoll_ctl,
1067 epoll_wait, mincore, mlockall, prctl, reboot, sendfile, sendfile64,
1068 sendmsg, sgetmask, ssetmask, swapon, tgkill and tkill syscalls.
1069 * Corrected io_* syscall entries on ARM.
1070 * Fixed PID prefix printing in "strace -oLOG -ff -p1 -p2 -p3" case.
1071 * Fixed logging of unfinished lines in "strace -oLOG -ff" case.
1072 * Fixed build when libaio-devel is not available.
1073 * Fixed configure checks for PTRACE_* constants.
1074 * Fixed compilation warnings remained on several architectures.
1077 * Removed all non-Linux code. After years of neglect, that dead code
1078 just hampered further strace development.
1079 * Linux kernel >= 2.6.18 is recommended. Older versions might still
1080 work but they haven't been thoroughly tested with this release.
1082 Noteworthy changes in release 4.6 (2011-03-15)
1083 ==============================================
1085 * Changes in behavior
1086 * Print diagnostic information about changes in personality mode to
1087 standard error instead of standard output.
1090 * Implemented a new method of following clone, fork, and vfork
1091 syscalls using the Linux kernel's explicit facilities for tracing
1092 creation of threads and child processes.
1093 * Implemented CLONE_PARENT and CLONE_UNTRACED flags handling.
1094 * Implemented decoding of TLS syscalls on m68k.
1095 * Implemented biarch support on powerpc64.
1096 * Implemented biarch support for getrlimit() and setrlimit().
1097 * Implemented decoding of struct ucred in getsockopt SO_PEERCRED.
1098 * Implemented SOL_SCTP socket options decoding.
1099 * Added HDIO_* ioctl names.
1100 (Addresses Debian bug #450953).
1101 * Added LOOP_* ioctl names.
1102 * Updated lists of CLOCK_*, CLONE_*, MS_*, and SOL_* constants
1103 to match Linux 2.6.37.
1104 * Updated the list of IPPROTO_* constants to match netinet/in.h.
1105 * Implemented decoding of HDIO_* and BLK* ioctls.
1106 * Added MicroBlaze architecture support.
1107 * Added new syscall entries to match Linux 2.6.37.
1108 * Regenerated list of ioctl names from Linux 2.6.37.
1109 * Enhanced signal notification decoding.
1110 * Documented -C and -D options.
1113 * Fixed fetching syscall arguments on m68k.
1114 * Fixed an error when judging whether a process has children.
1115 * Fixed get/set_robust_list syscall numbers for powerpc.
1116 * Fixed a corner case in printing clone flags.
1117 * Fixed cross-compiling issues.
1118 * Fixed build issues on powerpc64, SH and SPARC.
1119 * Fixed syscall flags of fstatat*, mmap, mmap2, fadvise64*, swapoff,
1120 fgetxattr, flistxattr, fremovexattr, epoll_create, fallocate,
1121 fanotify_init, and fanotify_mark syscalls.
1122 * Fixed decoding of get[ug]id, gete[ug]id and setfs[ug]id return values.
1123 * Fixed biarch support in IO dumping.
1124 * Fixed raw exit_group decoding.
1125 * Fixed decoding of file descriptors on 64-bit architectures.
1126 * Fixed a corner case in waitpid handling.
1127 (Addresses Red Hat bug #663547).
1128 * Fixed stat64 decoding on mips
1129 (Addresses Debian bug #599028).
1130 * Fixed misleading italics in the manual page.
1131 (Addresses Debian bug #589323).
1133 Noteworthy changes in release 4.5.20 (2010-04-13)
1134 =================================================
1137 * Implemented decoding of new linux syscalls: inotify_init1, recvmmsg.
1138 * Implemented basic decoding of new linux syscalls: preadv, pwritev,
1139 rt_tgsigqueueinfo, perf_event_open.
1140 * Enhanced decoding of recently added syscalls on non-x86 architectures
1141 by replacing a bare decoder with elaborate parsers enabled earlier
1143 * Implemented -C option to combine regular and -c output.
1144 (Addresses Debian bug #466196)
1145 * Enhanced decoding of mbind and mremap syscalls.
1146 * Enhanced SOL_PACKET socket options decoding.
1147 * Regenerated list of ioctl names from linux 2.6.33.
1148 * Added TILE architecture support.
1151 * Fixed build with Linux kernel headers 2.6.32-rc5+.
1152 (Addresses Debian bug #560516 and Fedora bug #539044)
1153 * Fixed build on mips.
1154 * Fixed handling of Linux systems without struct statfs64.
1155 * Fixed reporting signal mask by sigreturn on powerpc.
1156 * Fixed potential stack buffer overflow in select decoder.
1157 (Addresses Fedora bug #556678)
1158 * Corrected msgsnd indirect ipccall decoding.
1159 * Corrected decoding of 64bit syscalls.
1160 (Addresses Debian bug #570603)
1161 * Corrected getsockopt decoding on architectures where
1162 sizeof(long) > sizeof(int).
1163 (Addresses Debian bug #494844)
1164 * Corrected decoding of epoll_pwait.
1165 (Addresses Debian bug #513014)
1166 * Corrected handling of killed threads.
1168 Noteworthy changes in release 4.5.19 (2009-10-21)
1169 =================================================
1171 * Changes in behavior
1172 * When command exits, strace now exits with the same exit status.
1173 If command is terminated by a signal, strace terminates itself
1174 with the same signal, so that strace can be used as a wrapper
1175 process transparent to the invoking parent process.
1176 When using -p option, the exit status of strace is zero unless
1177 there was an unexpected error in doing the tracing.
1178 (Addresses Fedora bug #105371 and Debian bug #37665)
1181 * Implemented decoding of new Linux syscalls: accept4, dup3,
1182 epoll_create1, eventfd2, inotify_init1, pipe2, signalfd4.
1183 * Implemented decoding of socket type flags introduced in Linux 2.6.27.
1184 * Implemented decoding of accept4 socketcall.
1185 * Enhanced prctl decoding.
1186 * Enhanced nanosleep decoding.
1187 * Enhanced ptrace decoding.
1188 * Enhanced futex decoding.
1189 * Enhanced CAP_* decoding.
1190 * Enhanced SIOCS* ioctls decoding.
1191 * Enhanced fcntl F_* flags decoding.
1192 * Enhanced semop/semtimedop decoding.
1193 * Updated ARM architecture support.
1194 * Added Blackfin architecture support.
1195 * Added AVR32 architecture support.
1196 * Added CRIS architecture support.
1197 * Made strace detect when traced process suddenly disappeared.
1200 * Fixed syscall numbers for tee and sync_file_range.
1201 (Addresses Debian bug #503124)
1202 * Fixed several bugs in strings decoder, including potential heap
1204 (Addresses Fedora bugs #470529, #478324 and #511035)
1205 * Marked sendfile(2) as a network syscall.
1206 (Addresses Debian bug #509499)
1207 * Fixed accept(2) decoding.
1208 (Addresses Debian bug #507573)
1209 * Fixed sigtimedwait(2) decoding.
1210 * Fixed build on ARM EABI.
1211 (Addresses Debian bugs #520084 and #535564, and Fedora bug #507576)
1212 * Fixed display of 32-bit fcntl(F_SETLK) on 64-bit architectures.
1213 (Addresses Red Hat bug #471169)
1214 * Fixed display of 32-bit argv array on 64-bit architectures.
1215 (Addresses Fedora bug #519480)
1216 * Fixed display of 32-bit struct sigaction on 64-bit architectures.
1217 * Fixed HPPA architecture support.
1218 (Addresses Debian bugs #437928 and #546619)
1223 * Support new Linux/PPC system call subpage_prot and PROT_SAO flag.
1224 * In sigaction system call, display sa_flags value along with SIG_DFL/SIG_IGN.
1229 * -F is now deprecated, -f has traced vfork too on Linux for a long time now.
1230 * Print O_CLOEXEC, MSG_CMSG_CLOEXEC flag bits.
1231 * Improved output for prctl system call on Linux.
1232 * Improved support for Linux/ARM.
1233 * SA_NOMASK is now spelled SA_NODEFER, and SA_ONESHOT is spelled SA_RESETHAND.
1238 * Improved output for delete_module, futex, and mbind system calls on Linux.
1239 * Improved output for SG_IO ioctls on Linux.
1240 * Support new Linux system calls move_pages, utimensat, signalfd, timerfd,
1241 eventfd, getcpu, epoll_pwait.
1246 * Several biarch improvements.
1247 * Improved output for adjtimex, sysctl, quotactl, mount, umount.
1248 * Support new Linux system calls *at, inotify*, pselect6, ppoll and unshare.
1253 * Accept numeric system calls in -e.
1258 * Introduce "-e trace=desc".
1263 * Better x86-64 support for IA32 processes.
1264 * Update PowerPC system calls.
1265 * Better printing for Linux aio system calls.
1269 * Quick fix release for build issues.
1270 * One fix for Linux/ARM system call table.
1275 * Print fault address for SIGSEGV/SIGBUS signals when available.
1280 * Improve socket ioctl printing.
1281 * Update Linux/IA64 syscall list.
1282 * Fix Linux/x86-64 syscall argument extraction for 32-bit processes.
1283 * Improve mount flags printing.
1284 * Support symbolic printing of x86_64 arch_prctl parameters.
1289 * Update syscall tables for Alpha, ARM, HPPA.
1290 * Support new Linux syscalls mbind, set_mempolicy, get_mempolicy, waitid.
1291 * Support Linux syscalls fadvise64, fadvise64_64, and epoll_*.
1292 * Improve ioctl command name matching.
1293 * Print RTC_* ioctl structure contents.
1294 * Support newer RLIMIT_* values.
1295 * Print struct cmsghdr details in sendmsg.
1300 * Print attribute values in *xattr system calls on Linux.
1301 * Include pread and pwrite calls in -e read and -e write tracing.
1302 * Update SO_* and IP_* value lists and add IPV6_* values for socket options.
1303 * Print clock_t values symbolically in Linux clock_* system calls.
1307 * Bug fixes, Linux ioctl updates.
1308 * David Miller contributed support for Linux/SPARC64.
1316 * Update Linux ioctl lists.
1317 * Update PF_* and AF_* value lists.
1318 * The 4.5.3 -p behavior for NPTL threads applies only under -f, and got fixed.
1323 * On Linux using NPTL threads, -p will now attach to all threads in a process.
1324 * Handle new mq_* system calls in Linux 2.6.6 and later.
1329 * Report some new VM_* bit values on Linux.
1330 * Better output for Linux sched_* system calls.
1335 * Display multiple ioctl name matches on Linux.
1339 * New port to AMD's x86-64 architecture. One strace binary can
1340 handle both new x86-64 and old i386 processes.
1341 * Fixed support for LFS64 calls.
1342 * New switch -E to add/remove environment variables for the command.
1343 * Merged s390/s390x port.
1344 * Trace an unbounded number of processes.
1345 * Handle numerous new system calls in Linux 2.5, and new threads semantics.
1346 * Fixed bugs with attach/detach leaving things stopped.
1347 * Fixed traced process seeing ECHILD despite live, traced children
1348 in waitpid calls with WNOHANG.
1349 * Stuart Menefy contributed a port to Linux/SH.
1350 * Stephen Thomas contributed a port to Linux/SH64.
1351 * Many other bug fixes.
1355 * Fix Linux/ia64 support, looks like someone renamed a few things on us
1356 * Fix the ioctl setup for Linux, turned out it did not really work.
1357 Improve the ioctl extractor as well so we decode some more ones.
1361 * compile fixes for Linux/mips
1365 * Linux ia64 and hppa ports added
1366 * The usual Linux syscall updates (includes 32bit uid/gid support),
1367 * Linux ioctl list updated
1368 * Support IPv6 scope ids
1369 * FreeBSD/i386 port added
1370 * UnixWare and Solaris updates
1371 * Better support for tracing multithreaded processes in Linux
1375 * Compiles on glibc2.0 systems again
1376 * Linux/S390 port added
1377 * The usual Linux syscall updates
1378 * we can follow fork on arm now
1382 * Linux/MIPS port added
1383 * Lots of Linux updates again
1384 * Improved IPv6 support
1390 * Compiles on glibc2.0 systems again
1394 * Get stat structure properly on Linux 64bit archs
1395 * Personalities work again
1396 * Compile correctly on SunOS again
1402 * Linux (ultra)sparc fixes
1409 * add support for more Linux architectures (powerpc, sparc, arm)
1410 * support lots more Linux syscalls
1411 * fix signal handling
1412 * add IPX and IPIP support
1413 * check stray syscall after execv
1414 * fix hanging children
1416 Changes in version 3.1
1417 ======================
1419 * Irix5 is supported
1420 * Linux 68k is supported
1421 * Linux alpha is supported
1422 * configure is upgraded to autoconf 2.x
1423 * using -f in combination with -e now works correctly
1424 * output can be piped to a program
1425 * tracing setuid programs works better
1426 * it is now reasonable to install strace setuid to root in some circumstances
1427 * new useful tracing names like file and process to trace whole
1428 classes of system calls, e.g. -efile traces all system calls that
1429 take a file name as an argument
1430 * IPC calls on SunOS 4.1.x are decoded
1431 * Linux program memory is reliably dereferenced
1432 * Linux decodes at least the name of all syscalls as of pre2.0.4
1433 * various cosmetic changes and bug fixes
1435 Changes from versions 2.x to version 3.0
1436 ========================================
1438 * filename arguments are neither abbreviated nor stringified
1439 * string arguments are now true C strings using octal instead of hex by default
1440 * preprocessor constants are never shortened (e.g. was RDONLY => now O_RDONLY)
1441 * by default the output for multiple processes now goes into one file
1442 * all structures, vectors, bitsets, etc. use consistent output formats
1443 * the -c option now means count calls, -i does what the old -c used to do
1445 New Features in version 3.0
1446 ===========================
1448 * non-ascii strings can be optionally printed entirely in hex
1449 * the output format is readable when multiple processes are generating output
1450 * exit values are printed in an alignment column
1451 * is is possible to suppress messages about attaching and detaching
1452 * various tracing features can be enabled on a per syscall/signal/desc basis
1453 * selective tracing of syscalls
1454 * selective printing of syscall structures
1455 * selective abbreviation of long structures on a per syscall basis
1456 * selective printing of raw syscall arguments and results
1457 * selective tracing of signals
1458 * selective dumping of all I/O read from file descriptors
1459 * selective dumping of all I/O written to file descriptors
1460 * optional counting of time, calls, and errors for each syscall
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