1 Noteworthy changes in release ?.?? (????-??-??)
2 ===============================================
5 * On x32 personality, 64-bit syscalls (such as readv) are now shown with "#64"
6 suffix instead of "64:" prefix. Unlike the old names, these new names
7 can be used in syscall qualification expressions.
8 * Changed error number output format: error numbers are consistently
9 printed as "-1 ECONST (Error description)"
10 for known errors and as "-1 (errno 123)" for unknown errors,
11 regardless of -e raw qualification settings. One can specify
12 -X raw for displaying raw error numbers unconditionally.
13 * Unfetchable addresses inside arrays are now printed as comments.
16 * Implemented libdw backend for -k option, configured at build time
17 using --with-libdw option.
18 Whether -k option is compiled is now configured at build time
19 using --enable-stacktrace option.
20 * Added -X option for configuring xlat output formatting (addresses
22 * Added support for personality designation ("64", "32", or "x32") to syscall
23 qualifications in -e trace expressions.
24 * Implemented injection of syscalls with no side effects as an alternative
25 to injection of an invalid syscall (-e inject=SET:syscall= expression).
26 * Improved support for reproducible builds (addresses Debian bug #896016).
27 * Implemented decoding of BPF_PROG_QUERY and BPF_RAW_TRACEPOINT_OPEN bpf
29 * Implemented decoding of INOTIFY_IOC_SETNEXTWD and PERF_EVENT_IOC_* ioctl
31 * Implemented decoding of PR_GET_SPECULATION_CTRL and PR_SET_SPECULATION_CTRL
32 prctl syscall options.
33 * Enhanced decoding of bpf, getsockopt, setsockopt, and socket syscalls.
34 * Enhanced decoding of NETLINK_KOBJECT_UEVENT and NETLINK_ROUTE protocols.
35 * Enhanced decoding of *_DIAG_MEMINFO netlink attributes.
36 * Enhanced decoding of BTRFS_*, FS_IOC_*, SIOCGIFHWADDR, and SIOCSIFHWADDR
38 * Enhanced decoding of AF_BLUETOOTH socket addresses.
39 * Implemented decoding of io_pgetevent syscall.
40 * Updated lists of ADJ_*, BPF_*, BPF_F_*, BPF_PROG_TYPE_*, ETH_P_*, FPE_*,
41 IFF_*, IPPROTO_*, MAP_*, MS_*, MSG_*, NETLINK_*, PACKET_*, PROT_*, SCTP_*,
42 SECCOMP_FILTER_FLAG_*, SEGV_*, SEM_*, SHM_*, SW_*, V4L2_CID_*,
43 V4L2_CTRL_CLASS_*, and V4L2_PIX_FMT_* constants.
44 * Updated lists of ioctl commands from Linux 4.17.
47 * Fixed decoding of msgtyp argument of msgrcv syscall.
48 * Fixed fallback definitions for F_*, MCL_*, MSG_ZEROCOPY, SI_*,
49 and SOL_SOCKET constants.
51 Noteworthy changes in release 4.22 (2018-04-05)
52 ===============================================
54 * Changes in infrastructure
55 * The mailing list was moved to strace-devel@lists.strace.io.
56 * SourceForge git repository
57 (https://sourceforge.net/p/strace/code/ci/master/tree/) is no longer
58 maintained. Please use GitLab (https://gitlab.com/strace/strace/)
59 or GitHub (https://github.com/strace/strace/) repository instead.
61 * Changes in behaviour
62 * When printing string data, '8' and '9' following an octal escape sequence
63 no longer lead to unabbreviated octal escape sequence output, as they used
65 * Angle brackets are now printed as octal number escape sequences
66 in the output of paths associated with file descriptors.
67 * Data dump for write syscalls (-e write) is performed regardless
68 of successfulness of these syscall (addresses Debian bug #436284).
69 * -r and -t options are now affect output independently. Previously,
70 -r option led to ignoring of the -t option (addresses Debian bug #466195).
73 * Implemented delay injection (-e inject=SET:delay_enter= and
74 -e inject=SET:delay_exit= options).
75 * Added -A option for opening output files in append mode
76 (addresses Debian bug #528488).
77 * IPv6 addresses shown in socket information in -yy mode are now printed
79 * Enhanced decoding of bpf, prctl and ptrace syscalls.
80 * Enhanced decoding of BTRFS_IOC_INO_PATHS, BTRFS_IOC_LOGICAL_INO, and PTP_*
82 * Enhanced NETLINK_ROUTE protocol decoding.
83 * Updated lists of signal codes.
84 * Updated lists of BPF_*, BTN_*, ETH_P_*, INET_DIAG_BC_*, KEY_*, POLL*, RWF_*,
85 SCHED_FLAG_*, SCTP_* and error constants.
86 * Implemented block/character device number printing in -yy mode.
87 * Known pixel/SDR format names are printed as comments for pixelformat fields
89 * Enhanced decoding of kern_features syscall.
90 * Enhanced NETLINK_NETFILTER netlink protocol decoder.
91 * Optimized handling of large number of tracees.
92 * Improved wall clock time measurement in syscall count statistics
94 * Extended the range of allowed values in -e inject=...:retval= expression.
96 * Updated lists of ioctl commands from Linux 4.16.
97 * Enhanced manual page.
100 * Fixed build on m68k.
101 * Fixed v4l2 pixelformat decoding on big-endian architectures.
104 Noteworthy changes in release 4.21 (2018-02-13)
105 ===============================================
107 * Changes in behaviour
108 * Warning is now issued when -F option is used.
109 * Warning is now issued when a tracee with unsupported personality
111 * Unknown syscall numbers are now printed in hexadecimal form.
114 * Implemented decoding of netlink descriptor attributes as file descriptors.
115 * Implemented decoding of hugetlb page size selection flags.
116 * Implemented decoding of BPF_PROG_TEST_RUN, BPF_PROG_GET_NEXT_ID,
117 BPF_MAP_GET_NEXT_ID, BPF_PROG_GET_FD_BY_ID, BPF_MAP_GET_FD_BY_ID,
118 and BPF_OBJ_GET_INFO_BY_FD commands of bpf syscall.
119 * Enhanced decoding of get_thread_area, memfd_create, modify_ldt,
120 perf_event_open, reboot, s390_guarded_storage, s390_pcio_mmio_read,
121 s390_pci_mmio_write, s390_runtime_instr, s390_sthyi, set_thread_area,
123 * Implemented decoding of KVM_* and DM_LIST_DEVICES ioctl commands.
124 * Implemented decoding of riscv_flush_icache syscall.
125 * Enhanced decoding of getsockopt and setsockopt syscalls for SOL_NETLINK
127 * Enhanced decoding of BPF_MAP_CREATE command of bpf syscall.
128 * Print values returned by mq_open syscall and first arguments
129 of mq_getsetattr, mq_notify, mq_timedreceive, and mq_timedsend syscalls
131 * Added decoding of get_tls syscall on arm.
132 * Added -e trace=%pure option for tracing system calls with no arguments that
134 * Updated lists of IPV6_*, MAP_*, MEMBARRIER_CMD_*, MSG_*, NT_*, PKEY_*,
135 SHM_*, and TCP_* constants.
136 * Added manual page for the strace-log-merge command.
137 * Updated lists of ioctl commands from Linux 4.15.
138 * Implemented biarch support for s390x.
139 * Implemented an optional support for symbol demangling in strace -k output
140 (activated by --with-libiberty configure option).
141 * Information about availability of demangling and reliable personality
142 decoding (on architectures with multiple personalities) is now available
144 * Added decoding of pkey_alloc, pkey_free, and pkey_mprotect syscalls on
145 powerpc and powerpc64.
146 * Enhanced manual page.
149 * Fixed multi-personality support in cross builds.
150 * Added mq_getsetattr, mq_notify, mq_open, mq_timedreceive, and mq_timedsend
151 syscalls to %desc tracing set.
152 * Fixed path tracing support for mmap syscalls with indirect arguments and
153 for old select syscall.
154 * Fixed decoding of arm-specific (__ARM_NR_*) syscalls.
155 * Fixed open mode flags decoding.
156 * Fixed corner cases in handling of strace -ff -ttt logs by strace-log-merge.
157 * Error counts that exceed one billion are now printed correctly in call
159 * Fixed call summary header for x32 personality.
160 * Changes of tracee personalities are reported more reliably.
161 * Fixed the case when strace attaches to a tracee being inside exec and its
162 first syscall stop is syscall-exit-stop instead of syscall-enter-stop,
163 which messed up all the syscall state tracking.
164 * Fixed printing of higher 32 bits of the return value for x32 personality.
167 * A C compiler that supports "for" loop initial declarations is now required.
168 * Inability to configure multiple personality support on architectures where
169 multiple personalities are supported leads to configuration failure during
170 build now. Use --enable-mpers=check to revert to the old behaviour.
171 * Build-time requirement for the mpers support has been lowered from gawk 4
173 * Removed incomplete and non-functional support for the CRIS architecture.
174 * Removed incomplete and unused support for IA-32 mode on the IA-64
177 Noteworthy changes in release 4.20 (2017-11-13)
178 ===============================================
181 * Implemented decoding of NETLINK_NETFILTER netlink message types and flags.
182 * Implemented decoding of SECCOMP_GET_ACTION_AVAIL operation of seccomp
184 * Updated lists of ARPHRD_*, BPF_*, ETH_P_*, LOOP_*, MADV_*,
185 MEMBARRIER_CMD_*, MFD_*, SECCOMP_*, SO_*, SOL_*, TCP_*, and UFFD_FEATURE_*
187 * Added decoding of statx syscall on hppa.
188 * Updated lists of ioctl commands from Linux 4.14.
191 * Fixed powerpc personality support on powerpc64.
193 Noteworthy changes in release 4.19 (2017-09-05)
194 ===============================================
196 * Changes in behaviour
197 * Changed formatting of personality names on tile architecture in order
198 to make it in line with other multi-personality architectures.
199 * Changed field output order in struct v4l2_requestbuffers to improve in/out
201 * Changed handling of multiple signal= specifications in an injection
202 expression: multiple specification now leads to error instead of implicit
203 usage the last specification.
206 * Enhanced decoding of optlen argument of getsockopt syscall.
207 * Enhanced decoding of SO_LINGER option of getsockopt and setsockopt syscalls.
208 * Enhanced decoding of SO_PEERCRED option of getsockopt syscall.
209 * Enhanced decoding of IP_ADD_MEMBERSHIP, IP_DROP_MEMBERSHIP,
210 IPV6_ADD_MEMBERSHIP, IPV6_DROP_MEMBERSHIP, IPV6_JOIN_ANYCAST,
211 IPV6_LEAVE_ANYCAST, MCAST_JOIN_GROUP, and MCAST_LEAVE_GROUP options
212 of setsockopt syscall.
213 * Enhanced decoding of KEYCTL_DH_COMPUTE operation of keyctl syscall
214 (KDF parameters decoding).
215 * Implemented decoding of KEYCTL_RESTRICT_KEYRING operation of keyctl syscall.
216 * Enhanced decoding of UFFDIO_API ioctl command.
217 * Enhanced decoding of BPF_PROG_LOAD, BPF_MAP_CREATE, BPF_MAP_LOOKUP_ELEM,
218 and BPF_MAP_GET_NEXT_KEY commands of bpf syscall.
219 * Implemented decoding of linux socket filter programs specified
220 for SO_ATTACH_FILTER and SO_ATTACH_REUSEPORT_CBPF socket options.
221 * Implemented decoding of inet_diag_req_v2, inet_diag_req_compat,
222 packet_diag_msg, and smc_diag_msg netlink attributes of NETLINK_SOCK_DIAG.
223 * Implemented NETLINK_SELINUX protocol specific decoding.
224 * Implemented decoding of netlink message ack flags.
225 * Implemented decoding of nlmsgerr netlink attributes.
226 * Implemented basic protocol specific decoding of NETLINK_CRYPTO.
227 * Implemented decoding of crypto_user_alg netlink attributes
229 * Implemented basic protocol specific decoding of addr, addrlabel, dcb, link,
230 mdb, neigh, neightbl, netconf, nsid, route, rule, tc, and tca messages
232 * Implemented decoding of NETLINK_KOBJECT_UEVENT messages.
233 * Improved handling of unexpected tracees (the ones that cloned with
234 CLONE_PARENT/CLONE_PTRACE or called PTRACE_TRACEME on themselves): they
235 are now PTRACE_DETACH'ed instead of PTRACE_CONT'ed.
236 * Updated lists of BPF_*, KEY_*, RWF_*, SCM_*, SO_*, and *_MAGIC constants.
237 * Added decoding of arch_prctl syscall on x86.
238 * Added decoding of seccomp, bpf, userfaultfd, membarrier, mlock2,
239 copy_file_range, preadv2, pwritev2, and statx on alpha.
240 * Added decoding of statx syscall on microblaze.
241 * Added decoding of s390_guarded_storage syscall on s390.
242 * Updated lists of ioctl commands from Linux 4.13.
243 * Enhanced manual page.
246 * Fixed printing of group_req structure on non-native personalities.
247 * Fixed output formatting of blkpg_ioctl_arg, dm_name_list, and iocb
249 * Fixed formatting of nul-terminated strings which have kernel-imposed size
251 * Fixed printing of paths that hit PATM_MAX limit in order to match kernel's
253 * Fixed build warnings on Android mips64.
254 * Fixed unused function "is_negated_errno" build warning when built
256 * Fixed syscall number and arguments retrieval behaviour on sparc64 and
257 mips o32 after prctl(PR_SET_DUMPABLE, 0) makes PTRACE_PEEKTEXT impossible
258 to use if Linux kernel has commit v4.10-rc1~114^2~2.
259 * Fixed path tracing for execveat, symlink, symlinkat, inotify_add_watch,
260 and inotify_init syscalls.
261 * Fixed personality switch printing on sparc64 and risc-v.
263 Noteworthy changes in release 4.18 (2017-07-05)
264 ===============================================
267 * Implemented decoding of SCM_TIMESTAMP* control messages.
268 * Implemented decoding of netlink NLMSG_DONE messages.
269 * Implemented decoding of netlink generic nlmsg_type and nlmsg_flags.
270 * Implemented decoding of NETLINK_AUDIT, NETLINK_NETFILTER, NETLINK_ROUTE,
271 NETLINK_SELINUX, NETLINK_SOCK_DIAG, and NETLINK_XFRM message types.
272 * Implemented decoding of NETLINK_GENERIC protocol families.
273 * Implemented basic protocol specific decoding of AF_INET, AF_INET6,
274 AF_NETLINK, AF_PACKET, AF_SMC, and AF_UNIX messages of NETLINK_SOCK_DIAG.
275 * Implemented basic decoding of netlink attributes.
276 * Implemented basic protocol specific decoding of AF_INET, AF_NETLINK,
277 AF_PACKET, AF_SMC, and AF_UNIX netlink attributes of NETLINK_SOCK_DIAG.
278 * Implemented decoding of inet_diag_msg, netlink_diag_msg, and unix_diag_msg
279 netlink attributes of NETLINK_SOCK_DIAG.
280 * Updated lists of ARPHRD_*, KEYCTL_*, NDIAG_SHOW_*, RTM_*, SCM_*, SCTP_*,
281 SO_*, V4L2_*, and prctl ARCH_* constants.
282 * Updated lists of ioctl commands from Linux 4.12.
285 * In interactive mode (-I2), those signals that were blocked at startup
286 will remain blocked for the whole period of strace execution.
287 * strace no longer resets SIGCHLD handler in tracees to the default action.
288 * When traced command is terminated by a blocked signal, strace unblocks
289 that signal to ensure its own termination with the same signal.
290 * Fixed corner cases in decoding of old sigaction syscall.
291 * Fixed build with old kernel headers on mips.
292 * Fixed build on aarch64 and tile with glibc >= 2.26.
293 * Fixed build on arc and nios2.
295 Noteworthy changes in release 4.17 (2017-05-24)
296 ===============================================
298 * Changes in command line syntax
299 * Syscall classes specified in -e trace= option now have % prefix (like
300 -e trace=%process). Old style class names without leading % are still
301 supported, but considered deprecated now.
304 * Optimized syscall filtering.
305 * Improved representation of timestamps.
306 * Enhanced decoding of sched_setattr syscall.
307 * Added -e trace=%stat option for tracing variants of stat syscall.
308 * Added -e trace=%lstat option for tracing variants of lstat syscall.
309 * Added -e trace=%fstat option for tracing variants of fstat and fstatat
311 * Added -e trace=%%stat option for tracing syscalls used for querying file
312 status information (stat, lstat, fstat, fstatat, statx, and their
314 * Added -e trace=%statfs option for tracing statfs, statfs64 and statvfs
316 * Added -e trace=%fstatfs option for tracing fstatfs, fstatfs64 and fstatvfs
318 * Added -e trace=%%statfs option for tracing syscalls used for querying file
319 system statistics information (statfs-like, fstatfs-like and ustat).
320 * Added -e trace=/regex option for filtering syscalls using regular
322 * Added support for prepending of question mark before syscall qualification
323 in -e trace expressions in order to suppress error in case no syscalls
324 matched the provided qualification.
325 * Implemented decoding of signal mask in rt_sigreturn syscall on alpha, arc,
326 arm, avr32, bfin, cris, hppa, m68k, metag, microblaze, mips, nios2, or1k,
327 powerpc, powerpc64, riscv, sh, sh64, sparc, sparc64, tile, x86, and xtensa
329 * Implemented decoding of statx syscall.
330 * Implemented decoding of NS_* ioctl commands.
331 * Implemented decoding of the remaining V4L2_BUF_TYPE_* types.
332 * Implemented decoding of VIDIOC_[SG]_TUNER ioctl commands.
333 * Implemented decoding of NLMSG_ERROR netlink messages.
334 * Improved decoding of BPF_PROG_ATTACH command of bpf syscall.
335 * Improved decoding of misplaced parts in DM_* ioctl commands.
336 * Updated lists of ioctl commands from Linux 4.11.
339 * Fixed decoding of flags argument of preadv2 and pwritev2 syscalls on x32.
340 * Fixed the number of arguments and tracing flags of alpha specific syscalls.
341 * Fixed decoding of old sigsuspend syscall on alpha, cris, mips, powerpc,
342 powerpc64, sh, sh64, sparc, and sparc64.
343 * Fixed decoding of sgetmask and ssetmask syscalls on 64-bit architectures.
344 * Fixed decoding of netlink messages received within struct msghdr.
345 * Worked around a bug in miscompiled aarch64 kernels leading to the 3rd
346 argument of sched_getattr syscall being not quite 32-bit.
347 * Fixed corner cases of printing inaccessible times argument of utimes
348 and futimesat syscalls.
350 Noteworthy changes in release 4.16 (2017-02-14)
351 ===============================================
354 * Implemented syscall return value injection (-e inject=SET:retval= option).
355 * Implemented signal injection (-e inject=SET:signal= option).
356 * Implemented decoding of SUID_DUMP_* constants in PR_[GS]ET_DUMPABLE.
357 * Implemented decoding of all SG_* ioctl commands.
358 * Implemented decoding of ustat syscall.
359 * Implemented decoding of BPF_OBJ_PIN, BPF_OBJ_GET, BPF_PROG_ATTACH,
360 and BPF_PROG_DETACH commands of bpf syscall.
361 * Enhanced decoding of sg_io_hdr and sg_io_v4 structures.
362 * Enhanced decoding of get_robust_list, getrandom, io_submit, set_robust_list
364 * Enhanced decoding of entities of kernel long type on x32 and mips n32 ABIs.
365 * Updated lists of IP_*, IPV6_*, and LOOP_* constants.
366 * Updated lists of ioctl commands from Linux 4.10.
367 * Added decoding of recently added syscalls on avr32, microblaze, ppc,
371 * Fixed pathmatch of oldselect syscall on 64-bit architectures.
372 * Fixed decoding of mmap2 syscall on s390 when arguments are not available.
373 * Fixed decoding of kexec_file_load, mprotect, pkey_mprotect, prctl, preadv*,
374 and pwritev* syscalls on x32.
375 * Fixed printing of string arguments of getxattr and setxattr syscalls
376 when -s option is used to limit the printed string size.
377 * Fixed decoding of ifconf, ifreq, and loop_info structures on non-native
379 * Fixed decoding of SG_* and LOOP_* ioctl commands.
380 * Fixed build on mips with musl libc.
381 * Fixed cross-building of ioctlsort.
382 * Applied minor formatting fixes to the manual page.
384 Noteworthy changes in release 4.15 (2016-12-14)
385 ===============================================
387 * Changes in behavior
388 * Time stamps are now printed according to ISO 8601.
389 * Changed output format of val3 parameter of futex FUTEX_WAKE_OP operation.
390 * The last argument of mincore, sched_getaffinity, and sched_setaffinity
391 syscalls is now formatted as an array.
394 * Implemented syscall fault injection (-e fault=... option).
395 * Implemented decoding of DM_* ioctl commands.
396 * Implemented decoding of attr parameter of perf_event_open syscall.
397 * Implemented decoding of pkey_alloc, pkey_free, and pkey_mprotect syscalls.
398 * Implemented dumping of mq_timedsend and mq_timedreceive syscalls.
399 * Implemented decoding of PR_SET_FP_MODE and PR_GET_FP_MODE operations
401 * Implemented PTRACE_GETREGS API support on m68k.
402 * Updated lists of ARCH_*, BPF_*, BTRFS_*, FALLOC_*, MS_*, *_MAGIC,
403 and V4L2_* constants.
404 * Updated lists of ioctl commands from Linux 4.9.
405 * Added decoding of recently added syscalls on arc, x32, and xtensa.
406 * Enhanced manual page.
409 * Fixed corner cases in decoding of exit, exit_group, futimesat, getgroups,
410 getresuid, init_module, inotify_init1, kcmp, kexec_load, lookup_dcookie,
411 mq_getsetattr, mq_notify, mq_open, mq_timedreceive, mq_timedsend,
412 name_to_handle_at, prctl, process_vm_readv, process_vm_writev, setfsuid,
413 setgroups, setns, unshare, and utimes syscalls.
414 * Fixed handling of verbose flag in printing of controls array
415 of struct v4l2_ext_controls.
416 * Fixed omission of field names in the output of capability, sigaction,
417 sigevent, statfs, timespec, timeval, and utimbuf structures.
418 * Fixed printing of unknown syscalls in siginfo structure.
419 * Fixed decoding of ioctl constants on m68k.
420 * Fixed cris architecture support.
421 * Fixed cross build when host compiler does not support the same
422 set of warning flags as the cross compiler.
423 * Fixed build on SLE10 and SLE11.
425 Noteworthy changes in release 4.14 (2016-10-04)
426 ===============================================
428 * Changes in behavior
429 * When using -p option without a command and no processes has been attached,
430 strace exits with exit status 1.
433 * Added printing of the mode argument of open and openat syscalls
434 when O_TMPFILE flag is set. (Addresses Fedora bug #1377846).
435 * Enhanced -e abbrev=set, -e raw=set, and -e verbose=set.
436 * Enhanced decoding of futex, keyctl, quotactl, timerfd_settime,
437 and aio family syscalls.
438 * Implemented fetching of the 7th subcall argument on mips o32.
439 * Updated lists of BPF_*, ETH_P_*, KEXEC_ARCH_*, SCTP_*, TCP_*, and *_MAGIC
441 * Updated lists of ioctl commands from Linux 4.8.
442 * Added decoding of new syscalls on sh and sh64.
443 * Added RISC-V architecture support.
446 * Marked io_setup and io_destroy as memory mapping related syscalls.
447 * Fixed leakage of placeholder descriptors to tracees.
448 * Fixed printing of mode_t, umode_t, and umask types.
449 * Fixed decoding of iovec arrays without a limit on total data size.
450 * Fixed decoding of fadvise64, fallocate, futex, keyctl, quotactl, readahead,
451 and ipc family syscalls.
452 * Fixed decoding of invalid syscalls mapped to indirect subcalls.
453 * Fixed decoding of struct btrfs_ioctl_vol_args_v2 on non-native
455 * Fixed decoding of PTRACE_DETACH on sparc and sparc64.
456 * Fixed decoding of struct stat64 on sparc64.
457 * Fixed decoding of uid and gid-related syscalls on sparc64.
458 * Fixed decoding of the forth argument of semctl syscall on sparc64.
459 * Fixed values of tty ioctl constants on sparc64.
460 * Fixed sparc personality support on sparc64.
462 Noteworthy changes in release 4.13 (2016-07-26)
463 ===============================================
466 * Implemented a general netlink socket parser.
467 * Enhanced decoding of socket addresses.
468 * Enhanced decoding of cmsghdr, msghdr, and mmsghdr structures.
469 * Enhanced decoding of accept, accept4, bind, getpeername, getsockname,
470 ipc, recvfrom, recvmsg, recvmmsg, sendto, sendmmsg, and socketcall syscalls.
471 * Updated lists of AF_*, BPF_MAP_TYPE_*, KEY_*, KEYCTL_*, RWF_*, SS_*,
472 and *_MAGIC constants.
473 * Updated lists of ioctl commands from Linux 4.7.
476 * Fixed decoding of pid_t argument of prlimit64 syscall.
477 * Fixed sign extension issues in the parser of struct rusage.
478 * Fixed race condition in decoding of timeout argument of recvmmsg and
479 rt_sigtimedwait syscalls.
480 * Fixed build with fresh linux kernel headers.
482 Noteworthy changes in release 4.12 (2016-05-31)
483 ===============================================
486 * Implemented simultaneous use of -p option and tracing of a command.
487 (addresses Debian bug #549942).
488 * Implemented caching of netlink conversations to reduce amount of time
489 spent in decoding socket details in -yy mode.
490 * Implemented -yy mode decoding of protocol:portid pairs associated with
491 netlink socket descriptors.
492 * Implemented decoding of copy_file_range, preadv2, and pwritev2 syscalls.
493 * Implemented dumping of preadv, preadv2, pwritev, pwritev2, and vmsplice
495 * Implemented decoding of BTRFS_* and UFFDIO_* ioctl commands.
496 * Enhanced decoding of BLK*, EVIOC*, RTC_*, and VIDIOC_* ioctl commands.
497 * Enhanced decoding of fstatfs, fstatfs64, get_mempolicy, getdents,
498 getdents64, getgroups, getpriority, kill, mbind, migrate_pages, mknod,
499 mknodat, personality, poll, ppoll, quotactl, rt_sigpending,
500 rt_sigqueueinfo, rt_sigtimedwait, rt_tgsigqueueinfo, sched_getaffinity,
501 sched_setaffinity, seccomp, set_mempolicy, setgroups, setpriority, statfs,
502 statfs64, tgkill, waitid, and xattr family syscalls.
503 * Enhanced decoding of getxpid, getxuid, and getxgid syscalls on alpha.
504 * Enhanced decoding of pipe syscall on alpha, ia64, mips, sh, and sparc.
505 * Added decoding of bind, listen, and setsockopt direct syscalls on sparc.
506 * Added decoding of osf_statfs64 and osf_fstatfs64 syscalls on alpha.
507 * Added decoding of fadvise64 and fadvise64_64 on s390.
508 * Updated lists of AF_*, BPF_MAP_TYPE_*, CLONE_*, EPOLL*, IPV6_*, MADV_*,
509 MSG_*, PTRACE_*, SEGV_*, SO_*, SOL_*, *_MAGIC, and quotactl constants.
510 * Updated lists of ioctl commands from Linux 4.6.
513 * Fixed build on arc, metag, nios2, or1k, and tile architectures.
514 * Fixed decoding of 32-bit times syscall return value on 64-bit architectures.
515 * Fixed decoding of mlock2 syscall on sparc.
516 * Fixed decoding of osf_shmat syscall on alpha.
517 * Fixed decoding of syscalls unknown to the kernel on s390/s390x.
518 (addresses Debian bug #485979 and Fedora bug #1298294).
519 * Fixed decoding of preadv syscall in case of short read.
520 * Fixed decoding and dumping of readv syscall in case of short read.
521 * Fixed dumping of recvmsg and recvmmsg syscalls in case of short read.
522 * Fixed decoding of mincore syscall's last argument.
523 * Fixed remaining errors in mapping between syscall numbers and numbers
524 of syscall arguments.
525 * Applied various fixes to strace-graph script.
527 Noteworthy changes in release 4.11 (2015-12-21)
528 ===============================================
530 * Changes in behavior
531 * Some syscalls have different names depending on architecture and
532 personality. In these cases, syscall filtering and printing now
533 consistently uses the names that match corresponding __NR_* kernel
534 macros of the tracee's architecture and personality.
535 * Added strace prefix to all diagnostic messages.
538 * Enhanced and extended test suite.
539 * Implemented reliable tracing of processes whose personality differs
540 from the personality of strace, fixed decoding of 32-bit personality
541 syscalls on 64-bit architectures.
542 * When some data referenced by syscall arguments is irrelevant or cannot
543 be read from tracee's memory, strace now prints its address consistently.
544 * When a syscall is restarted using restart_syscall mechanism, strace now
545 shows the syscall name on architectures that expose this information.
546 * Print values returned by epoll_create1, eventfd, eventfd2, fanotify_init,
547 inotify_init1, perf_event_open, pipe, pipe2, signalfd, signalfd4, socket,
548 socketpair, timerfd, and timerfd_create syscalls, as well as F_DUPFD and
549 F_DUPFD_CLOEXEC fcntl commands, as file descriptors.
550 * Optimized decoding of indirect socket syscalls.
551 * Implemented decoding of nanoseconds along with seconds in stat family
552 syscalls (addresses Fedora bug #1251176).
553 * Implemented decoding of struct statfs.f_flags in statfs syscall.
554 * Implemented decoding of siginfo_t.si_syscall and siginfo_t.si_arch
556 * Implemented decoding of indirect syscall on mips o32.
557 * Implemented decoding of IPPROTO_IP control messages.
558 * Implemented decoding of setsockopt syscall multicast arguments.
559 * Enhanced decoding of struct sigevent.
560 * Enhanced decoding of block, loop, mtd, ptp, rtc, SG_IO, socket, tty,
561 and v4l2 ioctl syscall arguments.
562 * Enhanced decoding of epoll_create, fcntl, fcntl64, futex, getdents,
563 getdents64, getsockopt, io_*, mount, msgctl, prctl, quotactl, recvfrom,
564 sendfile, setsockopt, and shmctl syscalls.
565 * Implemented decoding of bpf, execveat, ioperm, iopl, kcmp, kexec_file_load,
566 lookup_dcookie, membarrier, memfd_create, mlock2, name_to_handle_at,
567 open_by_handle_at, sched_getattr, sched_setattr, and userfaultfd syscalls.
568 * Updated lists of AF_*, EPOLL_*, FALLOC_FL_*, F_*, INPUT_PROP_*, IPPROTO_*,
569 IPV6_*, IP_*, KEY_*, LOCK_*, MNT_*, MS_*, PACKET_*, PERF_FLAG_*, PF_*,
570 PR_*, PTRACE_O_*, RENAME_*, SCTP_*, SECBIT_*, SO_*, TCP_*, and siginfo_t
572 * Added Nios II architecture support.
573 * Added new syscall entries to match Linux 4.4.
576 * Fixed potential short read of strings from tracee's memory.
577 * Fixed -qq option in conjunction with -o option.
578 * Fixed filtering of <unavailable> syscalls.
579 * Fixed decoding of ioctl syscall command on aarch64 and 32-bit architectures
580 with 64-bit aligned structures.
581 * Fixed decoding of eventfd2, epoll_create1, signalfd4, and sync_file_range2
582 syscall flags arguments.
583 * Fixed decoding of 4th argument of clock_nanosleep syscall.
584 * Fixed decoding of getpagesize syscall on m68k.
585 * Fixed decoding of getrandom and seccomp syscalls on aarch64.
586 * Fixed decoding of timezone argument of gettimeofday and settimeofday
588 * Fixed decoding of offset argument of mmap2 syscall on arm, sparc,
590 * Fixed decoding of pipe syscall on alpha and mips.
591 * Fixed decoding of pipe2 syscall on ia64, sh, sparc, and sparc64.
592 * Fixed decoding of signal mask argument of pselect6 syscall on x32.
593 * Fixed decoding of signal mask of rt_sigreturn syscall on aarch64, m68k,
595 * Fixed decoding of 4th argument of semctl indirect syscall.
596 * Fixed decoding of sa_restorer and sa_mask of sigaction syscall on m68k.
597 * Fixed decoding of statfs64 and fstatfs64 syscalls on arm eabi.
598 * Fixed decoding of struct dirent on x32.
599 * Fixed decoding of times syscall return value on mips n32 and x32.
600 * Fixed decoding of path argument of umount2 syscall
601 (addresses Debian bug #785050).
602 * Worked around a kernel bug in tracing privileged executables.
603 * Fixed various errors in mapping between syscall numbers and associated
604 information like the number of syscall arguments, the name of syscall,
607 Noteworthy changes in release 4.10 (2015-03-06)
608 ===============================================
611 * Added -yy option to print protocol and address information associated with
613 * Extended "-e read=set" and "-e write=set" options to cover sendmsg,
614 recvmsg, sendmmsg, and recvmmsg syscalls.
615 * Implemented full 32-bit decoding of ioctl commands
616 (addresses Debian bug #692913 and Fedora bug #902788).
617 * Implemented PTRACE_GETREGS API support on ia64.
618 * Implemented PTRACE_GETREGS API support on mips.
619 * Implemented PTRACE_GETREGSET API support on s390/s390x.
620 * Implemented decoding of getrandom and seccomp syscalls.
621 * Implemented full decoding of 64-bit capability sets.
622 * Implemented decoding of all prctl commands.
623 * Implemented decoding of parametrized ioctl commands.
624 * Implemented decoding of evdev ioctl commands.
625 * Implemented decoding of v4l ioctl commands.
626 * Implemented decoding of SG_IO v4 ioctl commands.
627 * Implemented decoding of FIFREEZE/FITHAW/FITRIM ioctl commands.
628 * Implemented decoding of FALLOC_FL_* fallocate flags.
629 * Implemented decoding of rt_sigreturn signal mask on aarch64,
631 * Enhanced socket decoder to support bluetooth sockets.
632 * Enhanced decoding of unlisted ioctl commands.
633 * Enhanced decoding of getsockopt and setsockopt syscall.
634 * Enhanced decoding of sysinfo syscall.
635 * Enhanced decoding of struct cmsghdr.
636 * Enhanced decoding of wait status.
637 * Enhanced aio support on non-x86 architectures by using external libaio.h.
638 * Added O_TMPFILE to the list of recognized open mode flags.
639 * Updated the list of filesystem type constants that is used in decoding
640 statfs family syscalls.
641 * Updated lists of CAP_*, PR_*, PTRACE_*, SCHED_*, SO_*, SOL_*, SWAP_FLAG_*,
643 * Updated lists of signal constants from Linux 3.19.
644 * Updated lists of errno constants from Linux 3.19.
645 * Updated lists of ioctl commands from Linux 3.9.
646 * Added new syscall entries to match Linux 3.19.
649 * Fixed various errors in mapping between syscall numbers and associated
650 information like the number of syscall arguments, the name of syscall,
652 * Fixed quoting issues in printing descriptors, filenames, network interface
653 names, struct utsname members, device/volume names of BLK* ioctl commands.
654 * Fixed uid_t/git_t decoding.
655 * Fixed potential out-of-bounds read issues in getdents/getdents64 decoders.
656 * Fixed potential open flags truncation on some architectures.
657 * Fixed decoding of struct ifreq.ifr_name.
658 * Fixed decoding of SIOCSIFNAME ioctl command.
659 * Fixed decoding of RENAME_* renameat2 flags.
660 * Fixed decoding of UTIME_NOW/UTIME_OMIT timeval structures.
661 * Fixed decoding of indirect ipc subcalls on some architectures.
662 * Fixed decoding of fanotify_mark syscall on 32-bit architectures.
663 * Fixed decoding of 32-bit stat structures on 64-bit architectures.
664 * Fixed decoding of 32-bit struct cmsghdr on 64-bit architectures.
665 * Fixed decoding of 32-bit preadv/pwritev offset on 64-bit architectures.
666 * Fixed decoding of sigreturn/rt_sigreturn signal mask on ia64, ppc, ppc64,
667 sparc, sparc64, mips, and s390.
668 * Fixed instruction pointer output (-i option) on architectures that support
669 several personalities.
670 * Fixed behaviour of "-e read=set" and "-e write=set" when read and write
672 * Fixed build on systems where struct sigaction has no sa_restorer member.
673 * Fixed build with uclibc and musl libc.
676 * Linux kernel >= 2.5.46 is required.
677 Older versions without a decent PTRACE_SETOPTIONS support will not work.
678 * On mips, linux kernel >= 2.6.15 is required.
679 Older versions without a decent PTRACE_GETREGS support will not work.
680 * On s390 and s390x, linux kernel >= 2.6.27 is required.
681 Older versions without a decent PTRACE_GETREGSET support will not work.
683 Noteworthy changes in release 4.9 (2014-08-15)
684 ==============================================
686 * Changes in behavior
687 * Disabled OABI support on ARM EABI systems by default,
688 added --enable-arm-oabi option to enable it at configure time.
691 * Added experimental -k option to print stack trace after each traced syscall.
692 * Added -w option to produce stats on syscall latency.
693 (addresses Debian bug #457497).
694 * Added ARC architecture support.
695 * Added PTRACE_GETREGS API support on PowerPC.
696 * Enhanced Bionic libc and musl libc support.
697 * Enhanced tracing of x86 personality processes on x86_64 and x32.
698 * Enhanced tracing of ARM personality processes on AArch64.
699 * Enhanced 32/64bit personality detection on PowerPC.
700 * Implemented decoding of add_key, ioprio_get, ioprio_set, kexec_load, keyctl,
701 renameat2, and request_key syscalls.
702 * Robustified decoding of select, pselect, and io_submit syscalls.
703 * Enhanced decoding of delete_module, fanotify_init, fanotify_mark, fcntl,
704 setdomainname, sethostname, setns, and sync_file_range syscalls.
705 * Enhanced decoding of signal bitmasks.
706 * Enhanced decoding of file descriptors.
707 * Enhanced siginfo_t decoding.
708 * Enhanced PF_NETLINK decoding.
709 * Updated CLOCK_* constants
710 (addresses Fedora bug #1088455).
711 * Added new syscall entries to match Linux 3.16.
714 * Added shmat and shmdt to the set of memory mapping related syscalls.
715 * Fixed detaching from stopped processes.
716 * Fixed fanotify_mark decoding on 32bit architectures.
717 * Fixed offset decoding in preadv and pwritev syscalls.
718 * Fixed select decoding for glibc in _FORTIFY_SOURCE mode.
719 * Fixed decoding of epoll_ctl syscall with EPOLL_CTL_DEL argument.
720 * Fixed build when <sys/ptrace.h> and <linux/ptrace.h> conflict
721 (addresses Fedora bug #993384).
722 * Miscellaneous corrections in the manual page.
723 (Addresses Debian bug #725987).
725 Noteworthy changes in release 4.8 (2013-06-03)
726 ==============================================
728 * Changes in behavior
729 * In case of normal strace termination, when the trace output is
730 redirected to a pipe, strace now closes it and waits for the pipe
731 process termination before exit.
734 * Implemented tracing using PTRACE_SEIZE API (when available).
735 * Implemented more reliable PTRACE_GETREGSET-based process personality
736 detection on x86-64 and x32 (when available).
737 * Added -e trace=memory option for tracing memory mapping related syscalls.
738 * Documented -b option.
739 * Allowed exit status messages to be suppressed by giving -q option twice.
740 * Added AArch64 architecture support
741 (addresses Debian bug #693074 and Fedora bug #969858).
742 * Added support for OpenRISC 1000, Meta, and Xtensa architectures.
743 * Added tilegx personality support for Tile.
744 * Enhanced support of NOMMU architectures.
745 * Enhanced decoding of getdents, mmap, perf_event_open, ptrace, and
747 * Added new syscall entries to match Linux 3.9.
748 * Regenerated the list of common ioctl names from Linux 3.9.
749 * Updated the list of errno constants.
750 * Updated lists of AF_*, MADV_*, MAP_*, MSG_*, MS_*, PF_*, PR_*,
751 PTRACE_O_*, and TCP_* constants.
752 * Implemented decoding of UBI ioctls.
753 * Removed redundant "*32" ioctl names.
756 * Fixed ERESTARTNOINTR leaking to userspace on ancient kernels
757 (addresses Fedora bug #659382).
758 * Fixed kernel release string parsing
759 (addresses Debian bug #702309).
760 * Fixed decoding of *xattr syscalls
761 (addresses Fedora bug #885233).
762 * Fixed handling of files with 64-bit inode numbers by 32-bit strace
763 (addresses Fedora bug #912790).
764 * Fixed tracing forks on SPARC.
765 * Fixed decoding of fadvise64, fallocate, ftruncate64, io_submit, pread,
766 preadv, pwrite, pwritev, readahead, sigaltstack, sync_file_range, sysctl,
767 and truncate64 syscalls.
768 * Fixed categories of multiple syscalls on most of supported architectures.
769 * Fixed decoding of non-native 32-bit personality recv[m]msg syscalls.
770 * Fixed decoding of multiple 32-bit personality syscalls on x32.
771 * Fixed decoding of long long syscall arguments on ARM, MIPS/o32, PowerPC,
772 S390x, and Tile architectures.
773 * Fixed semtimedop decoding on S390x.
774 * Fixed sram_alloc decoding on Blackfin.
775 * Fixed build when process_vm_readv is a stab.
776 * Fixed build with older versions of libaio.h.
778 Noteworthy changes in release 4.7 (2012-05-02)
779 ==============================================
781 * Changes in behavior
782 * strace no longer suspends waitpid until there is a child
783 for waitpid'ing process to collect status from.
784 * strace no longer detaches from a tracee which is supposed
786 * strace now issues a new message: "+++ exited with EXITCODE +++"
787 which shows exact moment strace got exit notification,
788 analogous to existing "+++ killed by SIG +++" message.
791 * Added x32 personality support (x86_64 architecture).
792 * Added -y and -P options to print file descriptor paths and
793 filter by those paths.
794 * Added -I option to control strace interactivity.
795 * Allowed -p option to take comma or whitespace-separated list of PIDs.
796 * Added strace_log_merge script helper to merge timestamped "strace -ff"
798 * Implemented decoding of clock_adjtime, get_robust_list, migrate_pages,
799 preadv, prlimit64, process_vm_readv, process_vm_writev, pwritev,
800 recvmmsg, recvmsg, rt_tgsigqueueinfo, sendmmsg, setns, set_robust_list,
801 sched_rr_get_interval, splice, syslog, tee and vmsplice syscalls.
802 * Enhanced decoding of capget, capset, getrlimit, flistxattr, io_submit,
803 listxattr, setrlimit and swapon syscalls.
804 * Implemented decoding of loop and mtd ioctls.
805 * Added syscall entries for new linux syscalls.
806 * Added syscall entries for direct socket system calls on powerpc.
807 * Updated the list of errno constants.
808 * Updated lists of MSG_*, STA_*, and TCP_* constants.
809 * Regenerated the list of ioctl names from Linux 3.3.
810 * Enhanced switching between processes with different personalities.
811 * Enhanced signals reporting by using short signal names.
812 * Made ERESTART* messages more descriptive.
813 * Made parsing of numbers from strings more robust.
814 * Added support for compat_statfs64 and statfs64.f_flags.
815 * Changed read of data blocks to use single process_vm_readv syscall
816 (when available) instead of several PTRACE_PEEKDATA operations.
817 * Changed read of registers on x86 and x86-64 to use single PTRACE_GETREGS
818 operation instead of several PTRACE_PEEKUSER operations.
819 * Applied various optimizations to make strace work faster.
822 * Implemented proper handling of real SIGTRAPs on kernels supporting
823 PTRACE_O_TRACESYSGOOD.
824 (Addresses Fedora bug #162774).
825 * Fixed sockaddr_un.sun_path name in decoded output.
826 (Addresses Debian bug #554946).
827 * Fixed to avoid potential core file clobbering on exit.
828 (Addresses Debian bug #656398).
829 * Fixed a typo in documentation.
830 (Addresses Debian bug #653309).
831 * Fixed decoding of timer id returned by timer_create.
832 * Fixed epoll_create1, epoll_wait and epoll_pwait decoding.
833 * Fixed *at syscalls flags decoding.
834 * Fixed ARM EABI 64-bit syscall's arguments decoding.
835 * Fixed semtimedop decoding on s390.
836 * Fixed osf_sigprocmask decoding on alpha.
837 * Fixed ipc and socket subcall decoding on several architectures.
838 * Corrected syscall entries for epoll_pwait, epoll_create, epoll_ctl,
839 epoll_wait, mincore, mlockall, prctl, reboot, sendfile, sendfile64,
840 sendmsg, sgetmask, ssetmask, swapon, tgkill and tkill syscalls.
841 * Corrected io_* syscall entries on ARM.
842 * Fixed PID prefix printing in "strace -oLOG -ff -p1 -p2 -p3" case.
843 * Fixed logging of unfinished lines in "strace -oLOG -ff" case.
844 * Fixed build when libaio-devel is not available.
845 * Fixed configure checks for PTRACE_* constants.
846 * Fixed compilation warnings remained on several architectures.
849 * Removed all non-Linux code. After years of neglect, that dead code
850 just hampered further strace development.
851 * Linux kernel >= 2.6.18 is recommended. Older versions might still
852 work but they haven't been thoroughly tested with this release.
854 Noteworthy changes in release 4.6 (2011-03-15)
855 ==============================================
857 * Changes in behavior
858 * Print diagnostic information about changes in personality mode to
859 standard error instead of standard output.
862 * Implemented a new method of following clone, fork, and vfork
863 syscalls using the Linux kernel's explicit facilities for tracing
864 creation of threads and child processes.
865 * Implemented CLONE_PARENT and CLONE_UNTRACED flags handling.
866 * Implemented decoding of TLS syscalls on m68k.
867 * Implemented biarch support on powerpc64.
868 * Implemented biarch support for getrlimit() and setrlimit().
869 * Implemented decoding of struct ucred in getsockopt SO_PEERCRED.
870 * Implemented SOL_SCTP socket options decoding.
871 * Added HDIO_* ioctl names.
872 (Addresses Debian bug #450953).
873 * Added LOOP_* ioctl names.
874 * Updated lists of CLOCK_*, CLONE_*, MS_*, and SOL_* constants
875 to match Linux 2.6.37.
876 * Updated the list of IPPROTO_* constants to match netinet/in.h.
877 * Implemented decoding of HDIO_* and BLK* ioctls.
878 * Added MicroBlaze architecture support.
879 * Added new syscall entries to match Linux 2.6.37.
880 * Regenerated list of ioctl names from Linux 2.6.37.
881 * Enhanced signal notification decoding.
882 * Documented -C and -D options.
885 * Fixed fetching syscall arguments on m68k.
886 * Fixed an error when judging whether a process has children.
887 * Fixed get/set_robust_list syscall numbers for powerpc.
888 * Fixed a corner case in printing clone flags.
889 * Fixed cross-compiling issues.
890 * Fixed build issues on powerpc64, SH and SPARC.
891 * Fixed syscall flags of fstatat*, mmap, mmap2, fadvise64*, swapoff,
892 fgetxattr, flistxattr, fremovexattr, epoll_create, fallocate,
893 fanotify_init, and fanotify_mark syscalls.
894 * Fixed decoding of get[ug]id, gete[ug]id and setfs[ug]id return values.
895 * Fixed biarch support in IO dumping.
896 * Fixed raw exit_group decoding.
897 * Fixed decoding of file descriptors on 64-bit architectures.
898 * Fixed a corner case in waitpid handling.
899 (Addresses Red Hat bug #663547).
900 * Fixed stat64 decoding on mips
901 (Addresses Debian bug #599028).
902 * Fixed misleading italics in the manual page.
903 (Addresses Debian bug #589323).
905 Noteworthy changes in release 4.5.20 (2010-04-13)
906 =================================================
909 * Implemented decoding of new linux syscalls: inotify_init1, recvmmsg.
910 * Implemented basic decoding of new linux syscalls: preadv, pwritev,
911 rt_tgsigqueueinfo, perf_event_open.
912 * Enhanced decoding of recently added syscalls on non-x86 architectures
913 by replacing a bare decoder with elaborate parsers enabled earlier
915 * Implemented -C option to combine regular and -c output.
916 (Addresses Debian bug #466196)
917 * Enhanced decoding of mbind and mremap syscalls.
918 * Enhanced SOL_PACKET socket options decoding.
919 * Regenerated list of ioctl names from linux 2.6.33.
920 * Added TILE architecture support.
923 * Fixed build with Linux kernel headers 2.6.32-rc5+.
924 (Addresses Debian bug #560516 and Fedora bug #539044)
925 * Fixed build on mips.
926 * Fixed handling of Linux systems without struct statfs64.
927 * Fixed reporting signal mask by sigreturn on powerpc.
928 * Fixed potential stack buffer overflow in select decoder.
929 (Addresses Fedora bug #556678)
930 * Corrected msgsnd indirect ipccall decoding.
931 * Corrected decoding of 64bit syscalls.
932 (Addresses Debian bug #570603)
933 * Corrected getsockopt decoding on architectures where
934 sizeof(long) > sizeof(int).
935 (Addresses Debian bug #494844)
936 * Corrected decoding of epoll_pwait.
937 (Addresses Debian bug #513014)
938 * Corrected handling of killed threads.
940 Noteworthy changes in release 4.5.19 (2009-10-21)
941 =================================================
943 * Changes in behavior
944 * When command exits, strace now exits with the same exit status.
945 If command is terminated by a signal, strace terminates itself
946 with the same signal, so that strace can be used as a wrapper
947 process transparent to the invoking parent process.
948 When using -p option, the exit status of strace is zero unless
949 there was an unexpected error in doing the tracing.
950 (Addresses Fedora bug #105371 and Debian bug #37665)
953 * Implemented decoding of new Linux syscalls: accept4, dup3,
954 epoll_create1, eventfd2, inotify_init1, pipe2, signalfd4.
955 * Implemented decoding of socket type flags introduced in Linux 2.6.27.
956 * Implemented decoding of accept4 socketcall.
957 * Enhanced prctl decoding.
958 * Enhanced nanosleep decoding.
959 * Enhanced ptrace decoding.
960 * Enhanced futex decoding.
961 * Enhanced CAP_* decoding.
962 * Enhanced SIOCS* ioctls decoding.
963 * Enhanced fcntl F_* flags decoding.
964 * Enhanced semop/semtimedop decoding.
965 * Updated ARM architecture support.
966 * Added Blackfin architecture support.
967 * Added AVR32 architecture support.
968 * Added CRIS architecture support.
969 * Made strace detect when traced process suddenly disappeared.
972 * Fixed syscall numbers for tee and sync_file_range.
973 (Addresses Debian bug #503124)
974 * Fixed several bugs in strings decoder, including potential heap
976 (Addresses Fedora bugs #470529, #478324 and #511035)
977 * Marked sendfile(2) as a network syscall.
978 (Addresses Debian bug #509499)
979 * Fixed accept(2) decoding.
980 (Addresses Debian bug #507573)
981 * Fixed sigtimedwait(2) decoding.
982 * Fixed build on ARM EABI.
983 (Addresses Debian bugs #520084 and #535564, and Fedora bug #507576)
984 * Fixed display of 32-bit fcntl(F_SETLK) on 64-bit architectures.
985 (Addresses Red Hat bug #471169)
986 * Fixed display of 32-bit argv array on 64-bit architectures.
987 (Addresses Fedora bug #519480)
988 * Fixed display of 32-bit struct sigaction on 64-bit architectures.
989 * Fixed HPPA architecture support.
990 (Addresses Debian bugs #437928 and #546619)
995 * Support new Linux/PPC system call subpage_prot and PROT_SAO flag.
996 * In sigaction system call, display sa_flags value along with SIG_DFL/SIG_IGN.
1001 * -F is now deprecated, -f has traced vfork too on Linux for a long time now.
1002 * Print O_CLOEXEC, MSG_CMSG_CLOEXEC flag bits.
1003 * Improved output for prctl system call on Linux.
1004 * Improved support for Linux/ARM.
1005 * SA_NOMASK is now spelled SA_NODEFER, and SA_ONESHOT is spelled SA_RESETHAND.
1010 * Improved output for delete_module, futex, and mbind system calls on Linux.
1011 * Improved output for SG_IO ioctls on Linux.
1012 * Support new Linux system calls move_pages, utimensat, signalfd, timerfd,
1013 eventfd, getcpu, epoll_pwait.
1018 * Several biarch improvements.
1019 * Improved output for adjtimex, sysctl, quotactl, mount, umount.
1020 * Support new Linux system calls *at, inotify*, pselect6, ppoll and unshare.
1025 * Accept numeric system calls in -e.
1030 * Introduce "-e trace=desc".
1035 * Better x86-64 support for IA32 processes.
1036 * Update PowerPC system calls.
1037 * Better printing for Linux aio system calls.
1041 * Quick fix release for build issues.
1042 * One fix for Linux/ARM system call table.
1047 * Print fault address for SIGSEGV/SIGBUS signals when available.
1052 * Improve socket ioctl printing.
1053 * Update Linux/IA64 syscall list.
1054 * Fix Linux/x86-64 syscall argument extraction for 32-bit processes.
1055 * Improve mount flags printing.
1056 * Support symbolic printing of x86_64 arch_prctl parameters.
1061 * Update syscall tables for Alpha, ARM, HPPA.
1062 * Support new Linux syscalls mbind, set_mempolicy, get_mempolicy, waitid.
1063 * Support Linux syscalls fadvise64, fadvise64_64, and epoll_*.
1064 * Improve ioctl command name matching.
1065 * Print RTC_* ioctl structure contents.
1066 * Support newer RLIMIT_* values.
1067 * Print struct cmsghdr details in sendmsg.
1072 * Print attribute values in *xattr system calls on Linux.
1073 * Include pread and pwrite calls in -e read and -e write tracing.
1074 * Update SO_* and IP_* value lists and add IPV6_* values for socket options.
1075 * Print clock_t values symbolically in Linux clock_* system calls.
1079 * Bug fixes, Linux ioctl updates.
1080 * David Miller contributed support for Linux/SPARC64.
1088 * Update Linux ioctl lists.
1089 * Update PF_* and AF_* value lists.
1090 * The 4.5.3 -p behavior for NPTL threads applies only under -f, and got fixed.
1095 * On Linux using NPTL threads, -p will now attach to all threads in a process.
1096 * Handle new mq_* system calls in Linux 2.6.6 and later.
1101 * Report some new VM_* bit values on Linux.
1102 * Better output for Linux sched_* system calls.
1107 * Display multiple ioctl name matches on Linux.
1111 * New port to AMD's x86-64 architecture. One strace binary can
1112 handle both new x86-64 and old i386 processes.
1113 * Fixed support for LFS64 calls.
1114 * New switch -E to add/remove environment variables for the command.
1115 * Merged s390/s390x port.
1116 * Trace an unbounded number of processes.
1117 * Handle numerous new system calls in Linux 2.5, and new threads semantics.
1118 * Fixed bugs with attach/detach leaving things stopped.
1119 * Fixed traced process seeing ECHILD despite live, traced children
1120 in waitpid calls with WNOHANG.
1121 * Stuart Menefy contributed a port to Linux/SH.
1122 * Stephen Thomas contributed a port to Linux/SH64.
1123 * Many other bug fixes.
1127 * Fix Linux/ia64 support, looks like someone renamed a few things on us
1128 * Fix the ioctl setup for Linux, turned out it did not really work.
1129 Improve the ioctl extractor as well so we decode some more ones.
1133 * compile fixes for Linux/mips
1137 * Linux ia64 and hppa ports added
1138 * The usual Linux syscall updates (includes 32bit uid/gid support),
1139 * Linux ioctl list updated
1140 * Support IPv6 scope ids
1141 * FreeBSD/i386 port added
1142 * UnixWare and Solaris updates
1143 * Better support for tracing multithreaded processes in Linux
1147 * Compiles on glibc2.0 systems again
1148 * Linux/S390 port added
1149 * The usual Linux syscall updates
1150 * we can follow fork on arm now
1154 * Linux/MIPS port added
1155 * Lots of Linux updates again
1156 * Improved IPv6 support
1162 * Compiles on glibc2.0 systems again
1166 * Get stat structure properly on Linux 64bit archs
1167 * Personalities work again
1168 * Compile correctly on SunOS again
1174 * Linux (ultra)sparc fixes
1181 * add support for more Linux architectures (powerpc, sparc, arm)
1182 * support lots more Linux syscalls
1183 * fix signal handling
1184 * add IPX and IPIP support
1185 * check stray syscall after execv
1186 * fix hanging children
1188 Changes in version 3.1
1189 ======================
1191 * Irix5 is supported
1192 * Linux 68k is supported
1193 * Linux alpha is supported
1194 * configure is upgraded to autoconf 2.x
1195 * using -f in combination with -e now works correctly
1196 * output can be piped to a program
1197 * tracing setuid programs works better
1198 * it is now reasonable to install strace setuid to root in some circumstances
1199 * new useful tracing names like file and process to trace whole
1200 classes of system calls, e.g. -efile traces all system calls that
1201 take a file name as an argument
1202 * IPC calls on SunOS 4.1.x are decoded
1203 * Linux program memory is reliably dereferenced
1204 * Linux decodes at least the name of all syscalls as of pre2.0.4
1205 * various cosmetic changes and bug fixes
1207 Changes from versions 2.x to version 3.0
1208 ========================================
1210 * filename arguments are neither abbreviated nor stringified
1211 * string arguments are now true C strings using octal instead of hex by default
1212 * preprocessor constants are never shortened (e.g. was RDONLY => now O_RDONLY)
1213 * by default the output for multiple processes now goes into one file
1214 * all structures, vectors, bitsets, etc. use consistent output formats
1215 * the -c option now means count calls, -i does what the old -c used to do
1217 New Features in version 3.0
1218 ===========================
1220 * non-ascii strings can be optionally printed entirely in hex
1221 * the output format is readable when multiple processes are generating output
1222 * exit values are printed in an alignment column
1223 * is is possible to suppress messages about attaching and detaching
1224 * various tracing features can be enabled on a per syscall/signal/desc basis
1225 * selective tracing of syscalls
1226 * selective printing of syscall structures
1227 * selective abbreviation of long structures on a per syscall basis
1228 * selective printing of raw syscall arguments and results
1229 * selective tracing of signals
1230 * selective dumping of all I/O read from file descriptors
1231 * selective dumping of all I/O written to file descriptors
1232 * optional counting of time, calls, and errors for each syscall