1 Noteworthy changes in release ?.?? (????-??-??)
2 ===============================================
5 * Enhanced decoding of optlen argument of getsockopt syscall.
6 * Enhanced decoding of SO_LINGER option of getsockopt and setsockopt syscalls.
7 * Enhanced decoding of SO_PEERCRED option of getsockopt syscall.
8 * Enhanced decoding of IP_ADD_MEMBERSHIP, IP_DROP_MEMBERSHIP,
9 IPV6_ADD_MEMBERSHIP, IPV6_DROP_MEMBERSHIP, IPV6_JOIN_ANYCAST,
10 IPV6_LEAVE_ANYCAST, MCAST_JOIN_GROUP, and MCAST_LEAVE_GROUP options
11 of setsockopt syscall.
12 * Implemented decoding of KEYCTL_RESTRICT_KEYRING operation of keyctl syscall.
13 * Enhanced decoding of UFFDIO_API ioctl command.
14 * Implemented decoding of linux socket filter programs specified
15 for SO_ATTACH_FILTER and SO_ATTACH_REUSEPORT_CBPF socket options.
16 * Implemented decoding of inet_diag_req_v2, inet_diag_req_compat,
17 packet_diag_msg, and smc_diag_msg netlink attributes of NETLINK_SOCK_DIAG.
18 * Implemented NETLINK_SELINUX protocol specific decoding.
19 * Implemented decoding of netlink message ack flags.
20 * Implemented decoding of nlmsgerr netlink attributes.
21 * Implemented basic protocol specific decoding of NETLINK_CRYPTO.
22 * Updated lists of BPF_*, KEY_*, RWF_*, SCM_*, SO_*, and *_MAGIC constants.
23 * Added decoding of arch_prctl syscall on x86.
26 * Fixed output formatting of blkpg_ioctl_arg, dm_name_list, and iocb
29 Noteworthy changes in release 4.18 (2017-07-05)
30 ===============================================
33 * Implemented decoding of SCM_TIMESTAMP* control messages.
34 * Implemented decoding of netlink NLMSG_DONE messages.
35 * Implemented decoding of netlink generic nlmsg_type and nlmsg_flags.
36 * Implemented decoding of NETLINK_AUDIT, NETLINK_NETFILTER, NETLINK_ROUTE,
37 NETLINK_SELINUX, NETLINK_SOCK_DIAG, and NETLINK_XFRM message types.
38 * Implemented decoding of NETLINK_GENERIC protocol families.
39 * Implemented basic protocol specific decoding of AF_INET, AF_INET6,
40 AF_NETLINK, AF_PACKET, AF_SMC, and AF_UNIX messages of NETLINK_SOCK_DIAG.
41 * Implemented basic decoding of netlink attributes.
42 * Implemented basic protocol specific decoding of AF_INET, AF_NETLINK,
43 AF_PACKET, AF_SMC, and AF_UNIX netlink attributes of NETLINK_SOCK_DIAG.
44 * Implemented decoding of inet_diag_msg, netlink_diag_msg, and unix_diag_msg
45 netlink attributes of NETLINK_SOCK_DIAG.
46 * Updated lists of ARPHRD_*, KEYCTL_*, NDIAG_SHOW_*, RTM_*, SCM_*, SCTP_*,
47 SO_*, V4L2_*, and prctl ARCH_* constants.
48 * Updated lists of ioctl commands from Linux 4.12.
51 * In interactive mode (-I2), those signals that were blocked at startup
52 will remain blocked for the whole period of strace execution.
53 * strace no longer resets SIGCHLD handler in tracees to the default action.
54 * When traced command is terminated by a blocked signal, strace unblocks
55 that signal to ensure its own termination with the same signal.
56 * Fixed corner cases in decoding of old sigaction syscall.
57 * Fixed build with old kernel headers on mips.
58 * Fixed build on aarch64 and tile with glibc >= 2.26.
59 * Fixed build on arc and nios2.
61 Noteworthy changes in release 4.17 (2017-05-24)
62 ===============================================
64 * Changes in command line syntax
65 * Syscall classes specified in -e trace= option now have % prefix (like
66 -e trace=%process). Old style class names without leading % are still
67 supported, but considered deprecated now.
70 * Optimized syscall filtering.
71 * Improved representation of timestamps.
72 * Enhanced decoding of sched_setattr syscall.
73 * Added -e trace=%stat option for tracing variants of stat syscall.
74 * Added -e trace=%lstat option for tracing variants of lstat syscall.
75 * Added -e trace=%fstat option for tracing variants of fstat and fstatat
77 * Added -e trace=%%stat option for tracing syscalls used for querying file
78 status information (stat, lstat, fstat, fstatat, statx, and their
80 * Added -e trace=%statfs option for tracing statfs, statfs64 and statvfs
82 * Added -e trace=%fstatfs option for tracing fstatfs, fstatfs64 and fstatvfs
84 * Added -e trace=%%statfs option for tracing syscalls used for querying file
85 system statistics information (statfs-like, fstatfs-like and ustat).
86 * Added -e trace=/regex option for filtering syscalls using regular
88 * Added support for prepending of question mark before syscall qualification
89 in -e trace expressions in order to suppress error in case no syscalls
90 matched the provided qualification.
91 * Implemented decoding of signal mask in rt_sigreturn syscall on alpha, arc,
92 arm, avr32, bfin, cris, hppa, m68k, metag, microblaze, mips, nios2, or1k,
93 powerpc, powerpc64, riscv, sh, sh64, sparc, sparc64, tile, x86, and xtensa
95 * Implemented decoding of statx syscall.
96 * Implemented decoding of NS_* ioctl commands.
97 * Implemented decoding of the remaining V4L2_BUF_TYPE_* types.
98 * Implemented decoding of VIDIOC_[SG]_TUNER ioctl commands.
99 * Implemented decoding of NLMSG_ERROR netlink messages.
100 * Improved decoding of BPF_PROG_ATTACH command of bpf syscall.
101 * Improved decoding of misplaced parts in DM_* ioctl commands.
102 * Updated lists of ioctl commands from Linux 4.11.
105 * Fixed decoding of flags argument of preadv2 and pwritev2 syscalls on x32.
106 * Fixed the number of arguments and tracing flags of alpha specific syscalls.
107 * Fixed decoding of old sigsuspend syscall on alpha, cris, mips, powerpc,
108 powerpc64, sh, sh64, sparc, and sparc64.
109 * Fixed decoding of sgetmask and ssetmask syscalls on 64-bit architectures.
110 * Fixed decoding of netlink messages received within struct msghdr.
111 * Worked around a bug in miscompiled aarch64 kernels leading to the 3rd
112 argument of sched_getattr syscall being not quite 32-bit.
113 * Fixed corner cases of printing inaccessible times argument of utimes
114 and futimesat syscalls.
116 Noteworthy changes in release 4.16 (2017-02-14)
117 ===============================================
120 * Implemented syscall return value injection (-e inject=SET:retval= option).
121 * Implemented signal injection (-e inject=SET:signal= option).
122 * Implemented decoding of SUID_DUMP_* constants in PR_[GS]ET_DUMPABLE.
123 * Implemented decoding of all SG_* ioctl commands.
124 * Implemented decoding of ustat syscall.
125 * Implemented decoding of BPF_OBJ_PIN, BPF_OBJ_GET, BPF_PROG_ATTACH,
126 and BPF_PROG_DETACH commands of bpf syscall.
127 * Enhanced decoding of sg_io_hdr and sg_io_v4 structures.
128 * Enhanced decoding of get_robust_list, getrandom, io_submit, set_robust_list
130 * Enhanced decoding of entities of kernel long type on x32 and mips n32 ABIs.
131 * Updated lists of IP_*, IPV6_*, and LOOP_* constants.
132 * Updated lists of ioctl commands from Linux 4.10.
133 * Added decoding of recently added syscalls on avr32, microblaze, ppc,
137 * Fixed pathmatch of oldselect syscall on 64-bit architectures.
138 * Fixed decoding of mmap2 syscall on s390 when arguments are not available.
139 * Fixed decoding of kexec_file_load, mprotect, pkey_mprotect, prctl, preadv*,
140 and pwritev* syscalls on x32.
141 * Fixed printing of string arguments of getxattr and setxattr syscalls
142 when -s option is used to limit the printed string size.
143 * Fixed decoding of ifconf, ifreq, and loop_info structures on non-native
145 * Fixed decoding of SG_* and LOOP_* ioctl commands.
146 * Fixed build on mips with musl libc.
147 * Fixed cross-building of ioctlsort.
148 * Applied minor formatting fixes to the manual page.
150 Noteworthy changes in release 4.15 (2016-12-14)
151 ===============================================
153 * Changes in behavior
154 * Time stamps are now printed according to ISO 8601.
155 * Changed output format of val3 parameter of futex FUTEX_WAKE_OP operation.
156 * The last argument of mincore, sched_getaffinity, and sched_setaffinity
157 syscalls is now formatted as an array.
160 * Implemented syscall fault injection (-e fault=... option).
161 * Implemented decoding of DM_* ioctl commands.
162 * Implemented decoding of attr parameter of perf_event_open syscall.
163 * Implemented decoding of pkey_alloc, pkey_free, and pkey_mprotect syscalls.
164 * Implemented dumping of mq_timedsend and mq_timedreceive syscalls.
165 * Implemented decoding of PR_SET_FP_MODE and PR_GET_FP_MODE operations
167 * Implemented PTRACE_GETREGS API support on m68k.
168 * Updated lists of ARCH_*, BPF_*, BTRFS_*, FALLOC_*, MS_*, *_MAGIC,
169 and V4L2_* constants.
170 * Updated lists of ioctl commands from Linux 4.9.
171 * Added decoding of recently added syscalls on arc, x32, and xtensa.
172 * Enhanced manual page.
175 * Fixed corner cases in decoding of exit, exit_group, futimesat, getgroups,
176 getresuid, init_module, inotify_init1, kcmp, kexec_load, lookup_dcookie,
177 mq_getsetattr, mq_notify, mq_open, mq_timedreceive, mq_timedsend,
178 name_to_handle_at, prctl, process_vm_readv, process_vm_writev, setfsuid,
179 setgroups, setns, unshare, and utimes syscalls.
180 * Fixed handling of verbose flag in printing of controls array
181 of struct v4l2_ext_controls.
182 * Fixed omission of field names in the output of capability, sigaction,
183 sigevent, statfs, timespec, timeval, and utimbuf structures.
184 * Fixed printing of unknown syscalls in siginfo structure.
185 * Fixed decoding of ioctl constants on m68k.
186 * Fixed cris architecture support.
187 * Fixed cross build when host compiler does not support the same
188 set of warning flags as the cross compiler.
189 * Fixed build on SLE10 and SLE11.
191 Noteworthy changes in release 4.14 (2016-10-04)
192 ===============================================
194 * Changes in behavior
195 * When using -p option without a command and no processes has been attached,
196 strace exits with exit status 1.
199 * Added printing of the mode argument of open and openat syscalls
200 when O_TMPFILE flag is set. (Addresses Fedora bug #1377846).
201 * Enhanced -e abbrev=set, -e raw=set, and -e verbose=set.
202 * Enhanced decoding of futex, keyctl, quotactl, timerfd_settime,
203 and aio family syscalls.
204 * Implemented fetching of the 7th subcall argument on mips o32.
205 * Updated lists of BPF_*, ETH_P_*, KEXEC_ARCH_*, SCTP_*, TCP_*, and *_MAGIC
207 * Updated lists of ioctl commands from Linux 4.8.
208 * Added decoding of new syscalls on sh and sh64.
209 * Added RISC-V architecture support.
212 * Marked io_setup and io_destroy as memory mapping related syscalls.
213 * Fixed leakage of placeholder descriptors to tracees.
214 * Fixed printing of mode_t, umode_t, and umask types.
215 * Fixed decoding of iovec arrays without a limit on total data size.
216 * Fixed decoding of fadvise64, fallocate, futex, keyctl, quotactl, readahead,
217 and ipc family syscalls.
218 * Fixed decoding of invalid syscalls mapped to indirect subcalls.
219 * Fixed decoding of struct btrfs_ioctl_vol_args_v2 on non-native
221 * Fixed decoding of PTRACE_DETACH on sparc and sparc64.
222 * Fixed decoding of struct stat64 on sparc64.
223 * Fixed decoding of uid and gid-related syscalls on sparc64.
224 * Fixed decoding of the forth argument of semctl syscall on sparc64.
225 * Fixed values of tty ioctl constants on sparc64.
226 * Fixed sparc personality support on sparc64.
228 Noteworthy changes in release 4.13 (2016-07-26)
229 ===============================================
232 * Implemented a general netlink socket parser.
233 * Enhanced decoding of socket addresses.
234 * Enhanced decoding of cmsghdr, msghdr, and mmsghdr structures.
235 * Enhanced decoding of accept, accept4, bind, getpeername, getsockname,
236 ipc, recvfrom, recvmsg, recvmmsg, sendto, sendmmsg, and socketcall syscalls.
237 * Updated lists of AF_*, BPF_MAP_TYPE_*, KEY_*, KEYCTL_*, RWF_*, SS_*,
238 and *_MAGIC constants.
239 * Updated lists of ioctl commands from Linux 4.7.
242 * Fixed decoding of pid_t argument of prlimit64 syscall.
243 * Fixed sign extension issues in the parser of struct rusage.
244 * Fixed race condition in decoding of timeout argument of recvmmsg and
245 rt_sigtimedwait syscalls.
246 * Fixed build with fresh linux kernel headers.
248 Noteworthy changes in release 4.12 (2016-05-31)
249 ===============================================
252 * Implemented simultaneous use of -p option and tracing of a command.
253 (addresses Debian bug #549942).
254 * Implemented caching of netlink conversations to reduce amount of time
255 spent in decoding socket details in -yy mode.
256 * Implemented -yy mode decoding of protocol:portid pairs associated with
257 netlink socket descriptors.
258 * Implemented decoding of copy_file_range, preadv2, and pwritev2 syscalls.
259 * Implemented dumping of preadv, preadv2, pwritev, pwritev2, and vmsplice
261 * Implemented decoding of BTRFS_* and UFFDIO_* ioctl commands.
262 * Enhanced decoding of BLK*, EVIOC*, RTC_*, and VIDIOC_* ioctl commands.
263 * Enhanced decoding of fstatfs, fstatfs64, get_mempolicy, getdents,
264 getdents64, getgroups, getpriority, kill, mbind, migrate_pages, mknod,
265 mknodat, personality, poll, ppoll, quotactl, rt_sigpending,
266 rt_sigqueueinfo, rt_sigtimedwait, rt_tgsigqueueinfo, sched_getaffinity,
267 sched_setaffinity, seccomp, set_mempolicy, setgroups, setpriority, statfs,
268 statfs64, tgkill, waitid, and xattr family syscalls.
269 * Enhanced decoding of getxpid, getxuid, and getxgid syscalls on alpha.
270 * Enhanced decoding of pipe syscall on alpha, ia64, mips, sh, and sparc.
271 * Added decoding of bind, listen, and setsockopt direct syscalls on sparc.
272 * Added decoding of osf_statfs64 and osf_fstatfs64 syscalls on alpha.
273 * Added decoding of fadvise64 and fadvise64_64 on s390.
274 * Updated lists of AF_*, BPF_MAP_TYPE_*, CLONE_*, EPOLL*, IPV6_*, MADV_*,
275 MSG_*, PTRACE_*, SEGV_*, SO_*, SOL_*, *_MAGIC, and quotactl constants.
276 * Updated lists of ioctl commands from Linux 4.6.
279 * Fixed build on arc, metag, nios2, or1k, and tile architectures.
280 * Fixed decoding of 32-bit times syscall return value on 64-bit architectures.
281 * Fixed decoding of mlock2 syscall on sparc.
282 * Fixed decoding of osf_shmat syscall on alpha.
283 * Fixed decoding of syscalls unknown to the kernel on s390/s390x.
284 (addresses Debian bug #485979 and Fedora bug #1298294).
285 * Fixed decoding of preadv syscall in case of short read.
286 * Fixed decoding and dumping of readv syscall in case of short read.
287 * Fixed dumping of recvmsg and recvmmsg syscalls in case of short read.
288 * Fixed decoding of mincore syscall's last argument.
289 * Fixed remaining errors in mapping between syscall numbers and numbers
290 of syscall arguments.
291 * Applied various fixes to strace-graph script.
293 Noteworthy changes in release 4.11 (2015-12-21)
294 ===============================================
296 * Changes in behavior
297 * Some syscalls have different names depending on architecture and
298 personality. In these cases, syscall filtering and printing now
299 consistently uses the names that match corresponding __NR_* kernel
300 macros of the tracee's architecture and personality.
301 * Added strace prefix to all diagnostic messages.
304 * Enhanced and extended test suite.
305 * Implemented reliable tracing of processes whose personality differs
306 from the personality of strace, fixed decoding of 32-bit personality
307 syscalls on 64-bit architectures.
308 * When some data referenced by syscall arguments is irrelevant or cannot
309 be read from tracee's memory, strace now prints its address consistently.
310 * When a syscall is restarted using restart_syscall mechanism, strace now
311 shows the syscall name on architectures that expose this information.
312 * Print values returned by epoll_create1, eventfd, eventfd2, fanotify_init,
313 inotify_init1, perf_event_open, pipe, pipe2, signalfd, signalfd4, socket,
314 socketpair, timerfd, and timerfd_create syscalls, as well as F_DUPFD and
315 F_DUPFD_CLOEXEC fcntl commands, as file descriptors.
316 * Optimized decoding of indirect socket syscalls.
317 * Implemented decoding of nanoseconds along with seconds in stat family
318 syscalls (addresses Fedora bug #1251176).
319 * Implemented decoding of struct statfs.f_flags in statfs syscall.
320 * Implemented decoding of siginfo_t.si_syscall and siginfo_t.si_arch
322 * Implemented decoding of indirect syscall on mips o32.
323 * Implemented decoding of IPPROTO_IP control messages.
324 * Implemented decoding of setsockopt syscall multicast arguments.
325 * Enhanced decoding of struct sigevent.
326 * Enhanced decoding of block, loop, mtd, ptp, rtc, SG_IO, socket, tty,
327 and v4l2 ioctl syscall arguments.
328 * Enhanced decoding of epoll_create, fcntl, fcntl64, futex, getdents,
329 getdents64, getsockopt, io_*, mount, msgctl, prctl, quotactl, recvfrom,
330 sendfile, setsockopt, and shmctl syscalls.
331 * Implemented decoding of bpf, execveat, ioperm, iopl, kcmp, kexec_file_load,
332 lookup_dcookie, membarrier, memfd_create, mlock2, name_to_handle_at,
333 open_by_handle_at, sched_getattr, sched_setattr, and userfaultfd syscalls.
334 * Updated lists of AF_*, EPOLL_*, FALLOC_FL_*, F_*, INPUT_PROP_*, IPPROTO_*,
335 IPV6_*, IP_*, KEY_*, LOCK_*, MNT_*, MS_*, PACKET_*, PERF_FLAG_*, PF_*,
336 PR_*, PTRACE_O_*, RENAME_*, SCTP_*, SECBIT_*, SO_*, TCP_*, and siginfo_t
338 * Added Nios II architecture support.
339 * Added new syscall entries to match Linux 4.4.
342 * Fixed potential short read of strings from tracee's memory.
343 * Fixed -qq option in conjunction with -o option.
344 * Fixed filtering of <unavailable> syscalls.
345 * Fixed decoding of ioctl syscall command on aarch64 and 32-bit architectures
346 with 64-bit aligned structures.
347 * Fixed decoding of eventfd2, epoll_create1, signalfd4, and sync_file_range2
348 syscall flags arguments.
349 * Fixed decoding of 4th argument of clock_nanosleep syscall.
350 * Fixed decoding of getpagesize syscall on m68k.
351 * Fixed decoding of getrandom and seccomp syscalls on aarch64.
352 * Fixed decoding of timezone argument of gettimeofday and settimeofday
354 * Fixed decoding of offset argument of mmap2 syscall on arm, sparc,
356 * Fixed decoding of pipe syscall on alpha and mips.
357 * Fixed decoding of pipe2 syscall on ia64, sh, sparc, and sparc64.
358 * Fixed decoding of signal mask argument of pselect6 syscall on x32.
359 * Fixed decoding of signal mask of rt_sigreturn syscall on aarch64, m68k,
361 * Fixed decoding of 4th argument of semctl indirect syscall.
362 * Fixed decoding of sa_restorer and sa_mask of sigaction syscall on m68k.
363 * Fixed decoding of statfs64 and fstatfs64 syscalls on arm eabi.
364 * Fixed decoding of struct dirent on x32.
365 * Fixed decoding of times syscall return value on mips n32 and x32.
366 * Fixed decoding of path argument of umount2 syscall
367 (addresses Debian bug #785050).
368 * Worked around a kernel bug in tracing privileged executables.
369 * Fixed various errors in mapping between syscall numbers and associated
370 information like the number of syscall arguments, the name of syscall,
373 Noteworthy changes in release 4.10 (2015-03-06)
374 ===============================================
377 * Added -yy option to print protocol and address information associated with
379 * Extended "-e read=set" and "-e write=set" options to cover sendmsg,
380 recvmsg, sendmmsg, and recvmmsg syscalls.
381 * Implemented full 32-bit decoding of ioctl commands
382 (addresses Debian bug #692913 and Fedora bug #902788).
383 * Implemented PTRACE_GETREGS API support on ia64.
384 * Implemented PTRACE_GETREGS API support on mips.
385 * Implemented PTRACE_GETREGSET API support on s390/s390x.
386 * Implemented decoding of getrandom and seccomp syscalls.
387 * Implemented full decoding of 64-bit capability sets.
388 * Implemented decoding of all prctl commands.
389 * Implemented decoding of parametrized ioctl commands.
390 * Implemented decoding of evdev ioctl commands.
391 * Implemented decoding of v4l ioctl commands.
392 * Implemented decoding of SG_IO v4 ioctl commands.
393 * Implemented decoding of FIFREEZE/FITHAW/FITRIM ioctl commands.
394 * Implemented decoding of FALLOC_FL_* fallocate flags.
395 * Implemented decoding of rt_sigreturn signal mask on aarch64,
397 * Enhanced socket decoder to support bluetooth sockets.
398 * Enhanced decoding of unlisted ioctl commands.
399 * Enhanced decoding of getsockopt and setsockopt syscall.
400 * Enhanced decoding of sysinfo syscall.
401 * Enhanced decoding of struct cmsghdr.
402 * Enhanced decoding of wait status.
403 * Enhanced aio support on non-x86 architectures by using external libaio.h.
404 * Added O_TMPFILE to the list of recognized open mode flags.
405 * Updated the list of filesystem type constants that is used in decoding
406 statfs family syscalls.
407 * Updated lists of CAP_*, PR_*, PTRACE_*, SCHED_*, SO_*, SOL_*, SWAP_FLAG_*,
409 * Updated lists of signal constants from Linux 3.19.
410 * Updated lists of errno constants from Linux 3.19.
411 * Updated lists of ioctl commands from Linux 3.9.
412 * Added new syscall entries to match Linux 3.19.
415 * Fixed various errors in mapping between syscall numbers and associated
416 information like the number of syscall arguments, the name of syscall,
418 * Fixed quoting issues in printing descriptors, filenames, network interface
419 names, struct utsname members, device/volume names of BLK* ioctl commands.
420 * Fixed uid_t/git_t decoding.
421 * Fixed potential out-of-bounds read issues in getdents/getdents64 decoders.
422 * Fixed potential open flags truncation on some architectures.
423 * Fixed decoding of struct ifreq.ifr_name.
424 * Fixed decoding of SIOCSIFNAME ioctl command.
425 * Fixed decoding of RENAME_* renameat2 flags.
426 * Fixed decoding of UTIME_NOW/UTIME_OMIT timeval structures.
427 * Fixed decoding of indirect ipc subcalls on some architectures.
428 * Fixed decoding of fanotify_mark syscall on 32-bit architectures.
429 * Fixed decoding of 32-bit stat structures on 64-bit architectures.
430 * Fixed decoding of 32-bit struct cmsghdr on 64-bit architectures.
431 * Fixed decoding of 32-bit preadv/pwritev offset on 64-bit architectures.
432 * Fixed decoding of sigreturn/rt_sigreturn signal mask on ia64, ppc, ppc64,
433 sparc, sparc64, mips, and s390.
434 * Fixed instruction pointer output (-i option) on architectures that support
435 several personalities.
436 * Fixed behaviour of "-e read=set" and "-e write=set" when read and write
438 * Fixed build on systems where struct sigaction has no sa_restorer member.
439 * Fixed build with uclibc and musl libc.
442 * Linux kernel >= 2.5.46 is required.
443 Older versions without a decent PTRACE_SETOPTIONS support will not work.
444 * On mips, linux kernel >= 2.6.15 is required.
445 Older versions without a decent PTRACE_GETREGS support will not work.
446 * On s390 and s390x, linux kernel >= 2.6.27 is required.
447 Older versions without a decent PTRACE_GETREGSET support will not work.
449 Noteworthy changes in release 4.9 (2014-08-15)
450 ==============================================
452 * Changes in behavior
453 * Disabled OABI support on ARM EABI systems by default,
454 added --enable-arm-oabi option to enable it at configure time.
457 * Added experimental -k option to print stack trace after each traced syscall.
458 * Added -w option to produce stats on syscall latency.
459 (addresses Debian bug #457497).
460 * Added ARC architecture support.
461 * Added PTRACE_GETREGS API support on PowerPC.
462 * Enhanced Bionic libc and musl libc support.
463 * Enhanced tracing of x86 personality processes on x86_64 and x32.
464 * Enhanced tracing of ARM personality processes on AArch64.
465 * Enhanced 32/64bit personality detection on PowerPC.
466 * Implemented decoding of add_key, ioprio_get, ioprio_set, kexec_load, keyctl,
467 renameat2, and request_key syscalls.
468 * Robustified decoding of select, pselect, and io_submit syscalls.
469 * Enhanced decoding of delete_module, fanotify_init, fanotify_mark, fcntl,
470 setdomainname, sethostname, setns, and sync_file_range syscalls.
471 * Enhanced decoding of signal bitmasks.
472 * Enhanced decoding of file descriptors.
473 * Enhanced siginfo_t decoding.
474 * Enhanced PF_NETLINK decoding.
475 * Updated CLOCK_* constants
476 (addresses Fedora bug #1088455).
477 * Added new syscall entries to match Linux 3.16.
480 * Added shmat and shmdt to the set of memory mapping related syscalls.
481 * Fixed detaching from stopped processes.
482 * Fixed fanotify_mark decoding on 32bit architectures.
483 * Fixed offset decoding in preadv and pwritev syscalls.
484 * Fixed select decoding for glibc in _FORTIFY_SOURCE mode.
485 * Fixed decoding of epoll_ctl syscall with EPOLL_CTL_DEL argument.
486 * Fixed build when <sys/ptrace.h> and <linux/ptrace.h> conflict
487 (addresses Fedora bug #993384).
488 * Miscellaneous corrections in the manual page.
489 (Addresses Debian bug #725987).
491 Noteworthy changes in release 4.8 (2013-06-03)
492 ==============================================
494 * Changes in behavior
495 * In case of normal strace termination, when the trace output is
496 redirected to a pipe, strace now closes it and waits for the pipe
497 process termination before exit.
500 * Implemented tracing using PTRACE_SEIZE API (when available).
501 * Implemented more reliable PTRACE_GETREGSET-based process personality
502 detection on x86-64 and x32 (when available).
503 * Added -e trace=memory option for tracing memory mapping related syscalls.
504 * Documented -b option.
505 * Allowed exit status messages to be suppressed by giving -q option twice.
506 * Added AArch64 architecture support
507 (addresses Debian bug #693074 and Fedora bug #969858).
508 * Added support for OpenRISC 1000, Meta, and Xtensa architectures.
509 * Added tilegx personality support for Tile.
510 * Enhanced support of NOMMU architectures.
511 * Enhanced decoding of getdents, mmap, perf_event_open, ptrace, and
513 * Added new syscall entries to match Linux 3.9.
514 * Regenerated the list of common ioctl names from Linux 3.9.
515 * Updated the list of errno constants.
516 * Updated lists of AF_*, MADV_*, MAP_*, MSG_*, MS_*, PF_*, PR_*,
517 PTRACE_O_*, and TCP_* constants.
518 * Implemented decoding of UBI ioctls.
519 * Removed redundant "*32" ioctl names.
522 * Fixed ERESTARTNOINTR leaking to userspace on ancient kernels
523 (addresses Fedora bug #659382).
524 * Fixed kernel release string parsing
525 (addresses Debian bug #702309).
526 * Fixed decoding of *xattr syscalls
527 (addresses Fedora bug #885233).
528 * Fixed handling of files with 64-bit inode numbers by 32-bit strace
529 (addresses Fedora bug #912790).
530 * Fixed tracing forks on SPARC.
531 * Fixed decoding of fadvise64, fallocate, ftruncate64, io_submit, pread,
532 preadv, pwrite, pwritev, readahead, sigaltstack, sync_file_range, sysctl,
533 and truncate64 syscalls.
534 * Fixed categories of multiple syscalls on most of supported architectures.
535 * Fixed decoding of non-native 32-bit personality recv[m]msg syscalls.
536 * Fixed decoding of multiple 32-bit personality syscalls on x32.
537 * Fixed decoding of long long syscall arguments on ARM, MIPS/o32, PowerPC,
538 S390x, and Tile architectures.
539 * Fixed semtimedop decoding on S390x.
540 * Fixed sram_alloc decoding on Blackfin.
541 * Fixed build when process_vm_readv is a stab.
542 * Fixed build with older versions of libaio.h.
544 Noteworthy changes in release 4.7 (2012-05-02)
545 ==============================================
547 * Changes in behavior
548 * strace no longer suspends waitpid until there is a child
549 for waitpid'ing process to collect status from.
550 * strace no longer detaches from a tracee which is supposed
552 * strace now issues a new message: "+++ exited with EXITCODE +++"
553 which shows exact moment strace got exit notification,
554 analogous to existing "+++ killed by SIG +++" message.
557 * Added x32 personality support (x86_64 architecture).
558 * Added -y and -P options to print file descriptor paths and
559 filter by those paths.
560 * Added -I option to control strace interactivity.
561 * Allowed -p option to take comma or whitespace-separated list of PIDs.
562 * Added strace_log_merge script helper to merge timestamped "strace -ff"
564 * Implemented decoding of clock_adjtime, get_robust_list, migrate_pages,
565 preadv, prlimit64, process_vm_readv, process_vm_writev, pwritev,
566 recvmmsg, recvmsg, rt_tgsigqueueinfo, sendmmsg, setns, set_robust_list,
567 sched_rr_get_interval, splice, syslog, tee and vmsplice syscalls.
568 * Enhanced decoding of capget, capset, getrlimit, flistxattr, io_submit,
569 listxattr, setrlimit and swapon syscalls.
570 * Implemented decoding of loop and mtd ioctls.
571 * Added syscall entries for new linux syscalls.
572 * Added syscall entries for direct socket system calls on powerpc.
573 * Updated the list of errno constants.
574 * Updated lists of MSG_*, STA_*, and TCP_* constants.
575 * Regenerated the list of ioctl names from Linux 3.3.
576 * Enhanced switching between processes with different personalities.
577 * Enhanced signals reporting by using short signal names.
578 * Made ERESTART* messages more descriptive.
579 * Made parsing of numbers from strings more robust.
580 * Added support for compat_statfs64 and statfs64.f_flags.
581 * Changed read of data blocks to use single process_vm_readv syscall
582 (when available) instead of several PTRACE_PEEKDATA operations.
583 * Changed read of registers on x86 and x86-64 to use single PTRACE_GETREGS
584 operation instead of several PTRACE_PEEKUSER operations.
585 * Applied various optimizations to make strace work faster.
588 * Implemented proper handling of real SIGTRAPs on kernels supporting
589 PTRACE_O_TRACESYSGOOD.
590 (Addresses Fedora bug #162774).
591 * Fixed sockaddr_un.sun_path name in decoded output.
592 (Addresses Debian bug #554946).
593 * Fixed to avoid potential core file clobbering on exit.
594 (Addresses Debian bug #656398).
595 * Fixed a typo in documentation.
596 (Addresses Debian bug #653309).
597 * Fixed decoding of timer id returned by timer_create.
598 * Fixed epoll_create1, epoll_wait and epoll_pwait decoding.
599 * Fixed *at syscalls flags decoding.
600 * Fixed ARM EABI 64-bit syscall's arguments decoding.
601 * Fixed semtimedop decoding on s390.
602 * Fixed osf_sigprocmask decoding on alpha.
603 * Fixed ipc and socket subcall decoding on several architectures.
604 * Corrected syscall entries for epoll_pwait, epoll_create, epoll_ctl,
605 epoll_wait, mincore, mlockall, prctl, reboot, sendfile, sendfile64,
606 sendmsg, sgetmask, ssetmask, swapon, tgkill and tkill syscalls.
607 * Corrected io_* syscall entries on ARM.
608 * Fixed PID prefix printing in "strace -oLOG -ff -p1 -p2 -p3" case.
609 * Fixed logging of unfinished lines in "strace -oLOG -ff" case.
610 * Fixed build when libaio-devel is not available.
611 * Fixed configure checks for PTRACE_* constants.
612 * Fixed compilation warnings remained on several architectures.
615 * Removed all non-Linux code. After years of neglect, that dead code
616 just hampered further strace development.
617 * Linux kernel >= 2.6.18 is recommended. Older versions might still
618 work but they haven't been thoroughly tested with this release.
620 Noteworthy changes in release 4.6 (2011-03-15)
621 ==============================================
623 * Changes in behavior
624 * Print diagnostic information about changes in personality mode to
625 standard error instead of standard output.
628 * Implemented a new method of following clone, fork, and vfork
629 syscalls using the Linux kernel's explicit facilities for tracing
630 creation of threads and child processes.
631 * Implemented CLONE_PARENT and CLONE_UNTRACED flags handling.
632 * Implemented decoding of TLS syscalls on m68k.
633 * Implemented biarch support on powerpc64.
634 * Implemented biarch support for getrlimit() and setrlimit().
635 * Implemented decoding of struct ucred in getsockopt SO_PEERCRED.
636 * Implemented SOL_SCTP socket options decoding.
637 * Added HDIO_* ioctl names.
638 (Addresses Debian bug #450953).
639 * Added LOOP_* ioctl names.
640 * Updated lists of CLOCK_*, CLONE_*, MS_*, and SOL_* constants
641 to match Linux 2.6.37.
642 * Updated the list of IPPROTO_* constants to match netinet/in.h.
643 * Implemented decoding of HDIO_* and BLK* ioctls.
644 * Added MicroBlaze architecture support.
645 * Added new syscall entries to match Linux 2.6.37.
646 * Regenerated list of ioctl names from Linux 2.6.37.
647 * Enhanced signal notification decoding.
648 * Documented -C and -D options.
651 * Fixed fetching syscall arguments on m68k.
652 * Fixed an error when judging whether a process has children.
653 * Fixed get/set_robust_list syscall numbers for powerpc.
654 * Fixed a corner case in printing clone flags.
655 * Fixed cross-compiling issues.
656 * Fixed build issues on powerpc64, SH and SPARC.
657 * Fixed syscall flags of fstatat*, mmap, mmap2, fadvise64*, swapoff,
658 fgetxattr, flistxattr, fremovexattr, epoll_create, fallocate,
659 fanotify_init, and fanotify_mark syscalls.
660 * Fixed decoding of get[ug]id, gete[ug]id and setfs[ug]id return values.
661 * Fixed biarch support in IO dumping.
662 * Fixed raw exit_group decoding.
663 * Fixed decoding of file descriptors on 64-bit architectures.
664 * Fixed a corner case in waitpid handling.
665 (Addresses Red Hat bug #663547).
666 * Fixed stat64 decoding on mips
667 (Addresses Debian bug #599028).
668 * Fixed misleading italics in the manual page.
669 (Addresses Debian bug #589323).
671 Noteworthy changes in release 4.5.20 (2010-04-13)
672 =================================================
675 * Implemented decoding of new linux syscalls: inotify_init1, recvmmsg.
676 * Implemented basic decoding of new linux syscalls: preadv, pwritev,
677 rt_tgsigqueueinfo, perf_event_open.
678 * Enhanced decoding of recently added syscalls on non-x86 architectures
679 by replacing a bare decoder with elaborate parsers enabled earlier
681 * Implemented -C option to combine regular and -c output.
682 (Addresses Debian bug #466196)
683 * Enhanced decoding of mbind and mremap syscalls.
684 * Enhanced SOL_PACKET socket options decoding.
685 * Regenerated list of ioctl names from linux 2.6.33.
686 * Added TILE architecture support.
689 * Fixed build with Linux kernel headers 2.6.32-rc5+.
690 (Addresses Debian bug #560516 and Fedora bug #539044)
691 * Fixed build on mips.
692 * Fixed handling of Linux systems without struct statfs64.
693 * Fixed reporting signal mask by sigreturn on powerpc.
694 * Fixed potential stack buffer overflow in select decoder.
695 (Addresses Fedora bug #556678)
696 * Corrected msgsnd indirect ipccall decoding.
697 * Corrected decoding of 64bit syscalls.
698 (Addresses Debian bug #570603)
699 * Corrected getsockopt decoding on architectures where
700 sizeof(long) > sizeof(int).
701 (Addresses Debian bug #494844)
702 * Corrected decoding of epoll_pwait.
703 (Addresses Debian bug #513014)
704 * Corrected handling of killed threads.
706 Noteworthy changes in release 4.5.19 (2009-10-21)
707 =================================================
709 * Changes in behavior
710 * When command exits, strace now exits with the same exit status.
711 If command is terminated by a signal, strace terminates itself
712 with the same signal, so that strace can be used as a wrapper
713 process transparent to the invoking parent process.
714 When using -p option, the exit status of strace is zero unless
715 there was an unexpected error in doing the tracing.
716 (Addresses Fedora bug #105371 and Debian bug #37665)
719 * Implemented decoding of new Linux syscalls: accept4, dup3,
720 epoll_create1, eventfd2, inotify_init1, pipe2, signalfd4.
721 * Implemented decoding of socket type flags introduced in Linux 2.6.27.
722 * Implemented decoding of accept4 socketcall.
723 * Enhanced prctl decoding.
724 * Enhanced nanosleep decoding.
725 * Enhanced ptrace decoding.
726 * Enhanced futex decoding.
727 * Enhanced CAP_* decoding.
728 * Enhanced SIOCS* ioctls decoding.
729 * Enhanced fcntl F_* flags decoding.
730 * Enhanced semop/semtimedop decoding.
731 * Updated ARM architecture support.
732 * Added Blackfin architecture support.
733 * Added AVR32 architecture support.
734 * Added CRIS architecture support.
735 * Made strace detect when traced process suddenly disappeared.
738 * Fixed syscall numbers for tee and sync_file_range.
739 (Addresses Debian bug #503124)
740 * Fixed several bugs in strings decoder, including potential heap
742 (Addresses Fedora bugs #470529, #478324 and #511035)
743 * Marked sendfile(2) as a network syscall.
744 (Addresses Debian bug #509499)
745 * Fixed accept(2) decoding.
746 (Addresses Debian bug #507573)
747 * Fixed sigtimedwait(2) decoding.
748 * Fixed build on ARM EABI.
749 (Addresses Debian bugs #520084 and #535564, and Fedora bug #507576)
750 * Fixed display of 32-bit fcntl(F_SETLK) on 64-bit architectures.
751 (Addresses Red Hat bug #471169)
752 * Fixed display of 32-bit argv array on 64-bit architectures.
753 (Addresses Fedora bug #519480)
754 * Fixed display of 32-bit struct sigaction on 64-bit architectures.
755 * Fixed HPPA architecture support.
756 (Addresses Debian bugs #437928 and #546619)
761 * Support new Linux/PPC system call subpage_prot and PROT_SAO flag.
762 * In sigaction system call, display sa_flags value along with SIG_DFL/SIG_IGN.
767 * -F is now deprecated, -f has traced vfork too on Linux for a long time now.
768 * Print O_CLOEXEC, MSG_CMSG_CLOEXEC flag bits.
769 * Improved output for prctl system call on Linux.
770 * Improved support for Linux/ARM.
771 * SA_NOMASK is now spelled SA_NODEFER, and SA_ONESHOT is spelled SA_RESETHAND.
776 * Improved output for delete_module, futex, and mbind system calls on Linux.
777 * Improved output for SG_IO ioctls on Linux.
778 * Support new Linux system calls move_pages, utimensat, signalfd, timerfd,
779 eventfd, getcpu, epoll_pwait.
784 * Several biarch improvements.
785 * Improved output for adjtimex, sysctl, quotactl, mount, umount.
786 * Support new Linux system calls *at, inotify*, pselect6, ppoll and unshare.
791 * Accept numeric system calls in -e.
796 * Introduce "-e trace=desc".
801 * Better x86-64 support for IA32 processes.
802 * Update PowerPC system calls.
803 * Better printing for Linux aio system calls.
807 * Quick fix release for build issues.
808 * One fix for Linux/ARM system call table.
813 * Print fault address for SIGSEGV/SIGBUS signals when available.
818 * Improve socket ioctl printing.
819 * Update Linux/IA64 syscall list.
820 * Fix Linux/x86-64 syscall argument extraction for 32-bit processes.
821 * Improve mount flags printing.
822 * Support symbolic printing of x86_64 arch_prctl parameters.
827 * Update syscall tables for Alpha, ARM, HPPA.
828 * Support new Linux syscalls mbind, set_mempolicy, get_mempolicy, waitid.
829 * Support Linux syscalls fadvise64, fadvise64_64, and epoll_*.
830 * Improve ioctl command name matching.
831 * Print RTC_* ioctl structure contents.
832 * Support newer RLIMIT_* values.
833 * Print struct cmsghdr details in sendmsg.
838 * Print attribute values in *xattr system calls on Linux.
839 * Include pread and pwrite calls in -e read and -e write tracing.
840 * Update SO_* and IP_* value lists and add IPV6_* values for socket options.
841 * Print clock_t values symbolically in Linux clock_* system calls.
845 * Bug fixes, Linux ioctl updates.
846 * David Miller contributed support for Linux/SPARC64.
854 * Update Linux ioctl lists.
855 * Update PF_* and AF_* value lists.
856 * The 4.5.3 -p behavior for NPTL threads applies only under -f, and got fixed.
861 * On Linux using NPTL threads, -p will now attach to all threads in a process.
862 * Handle new mq_* system calls in Linux 2.6.6 and later.
867 * Report some new VM_* bit values on Linux.
868 * Better output for Linux sched_* system calls.
873 * Display multiple ioctl name matches on Linux.
877 * New port to AMD's x86-64 architecture. One strace binary can
878 handle both new x86-64 and old i386 processes.
879 * Fixed support for LFS64 calls.
880 * New switch -E to add/remove environment variables for the command.
881 * Merged s390/s390x port.
882 * Trace an unbounded number of processes.
883 * Handle numerous new system calls in Linux 2.5, and new threads semantics.
884 * Fixed bugs with attach/detach leaving things stopped.
885 * Fixed traced process seeing ECHILD despite live, traced children
886 in waitpid calls with WNOHANG.
887 * Stuart Menefy contributed a port to Linux/SH.
888 * Stephen Thomas contributed a port to Linux/SH64.
889 * Many other bug fixes.
893 * Fix Linux/ia64 support, looks like someone renamed a few things on us
894 * Fix the ioctl setup for Linux, turned out it did not really work.
895 Improve the ioctl extractor as well so we decode some more ones.
899 * compile fixes for Linux/mips
903 * Linux ia64 and hppa ports added
904 * The usual Linux syscall updates (includes 32bit uid/gid support),
905 * Linux ioctl list updated
906 * Support IPv6 scope ids
907 * FreeBSD/i386 port added
908 * UnixWare and Solaris updates
909 * Better support for tracing multithreaded processes in Linux
913 * Compiles on glibc2.0 systems again
914 * Linux/S390 port added
915 * The usual Linux syscall updates
916 * we can follow fork on arm now
920 * Linux/MIPS port added
921 * Lots of Linux updates again
922 * Improved IPv6 support
928 * Compiles on glibc2.0 systems again
932 * Get stat structure properly on Linux 64bit archs
933 * Personalities work again
934 * Compile correctly on SunOS again
940 * Linux (ultra)sparc fixes
947 * add support for more Linux architectures (powerpc, sparc, arm)
948 * support lots more Linux syscalls
949 * fix signal handling
950 * add IPX and IPIP support
951 * check stray syscall after execv
952 * fix hanging children
954 Changes in version 3.1
955 ======================
958 * Linux 68k is supported
959 * Linux alpha is supported
960 * configure is upgraded to autoconf 2.x
961 * using -f in combination with -e now works correctly
962 * output can be piped to a program
963 * tracing setuid programs works better
964 * it is now reasonable to install strace setuid to root in some circumstances
965 * new useful tracing names like file and process to trace whole
966 classes of system calls, e.g. -efile traces all system calls that
967 take a file name as an argument
968 * IPC calls on SunOS 4.1.x are decoded
969 * Linux program memory is reliably dereferenced
970 * Linux decodes at least the name of all syscalls as of pre2.0.4
971 * various cosmetic changes and bug fixes
973 Changes from versions 2.x to version 3.0
974 ========================================
976 * filename arguments are neither abbreviated nor stringified
977 * string arguments are now true C strings using octal instead of hex by default
978 * preprocessor constants are never shortened (e.g. was RDONLY => now O_RDONLY)
979 * by default the output for multiple processes now goes into one file
980 * all structures, vectors, bitsets, etc. use consistent output formats
981 * the -c option now means count calls, -i does what the old -c used to do
983 New Features in version 3.0
984 ===========================
986 * non-ascii strings can be optionally printed entirely in hex
987 * the output format is readable when multiple processes are generating output
988 * exit values are printed in an alignment column
989 * is is possible to suppress messages about attaching and detaching
990 * various tracing features can be enabled on a per syscall/signal/desc basis
991 * selective tracing of syscalls
992 * selective printing of syscall structures
993 * selective abbreviation of long structures on a per syscall basis
994 * selective printing of raw syscall arguments and results
995 * selective tracing of signals
996 * selective dumping of all I/O read from file descriptors
997 * selective dumping of all I/O written to file descriptors
998 * optional counting of time, calls, and errors for each syscall