1 Noteworthy changes in release ?.?? (????-??-??)
2 ===============================================
5 * Implemented decoding of SCM_TIMESTAMP* control messages.
6 * Updated lists of ioctl commands from Linux 4.12.
9 * In interactive mode (-I2), those signals that were blocked at startup
10 will remain blocked for the whole period of strace execution.
11 * strace no longer resets SIGCHLD handler in tracees to the default action.
12 * When traced command is terminated by a blocked signal, strace unblocks
13 that signal to ensure its own termination with the same signal.
14 * Fixed corner cases in decoding of old sigaction syscall.
15 * Fixed build with old kernel headers on mips.
17 Noteworthy changes in release 4.17 (2017-05-24)
18 ===============================================
20 * Changes in command line syntax
21 * Syscall classes specified in -e trace= option now have % prefix (like
22 -e trace=%process). Old style class names without leading % are still
23 supported, but considered deprecated now.
26 * Optimized syscall filtering.
27 * Improved representation of timestamps.
28 * Enhanced decoding of sched_setattr syscall.
29 * Added -e trace=%stat option for tracing variants of stat syscall.
30 * Added -e trace=%lstat option for tracing variants of lstat syscall.
31 * Added -e trace=%fstat option for tracing variants of fstat and fstatat
33 * Added -e trace=%%stat option for tracing syscalls used for querying file
34 status information (stat, lstat, fstat, fstatat, statx, and their
36 * Added -e trace=%statfs option for tracing statfs, statfs64 and statvfs
38 * Added -e trace=%fstatfs option for tracing fstatfs, fstatfs64 and fstatvfs
40 * Added -e trace=%%statfs option for tracing syscalls used for querying file
41 system statistics information (statfs-like, fstatfs-like and ustat).
42 * Added -e trace=/regex option for filtering syscalls using regular
44 * Added support for prepending of question mark before syscall qualification
45 in -e trace expressions in order to suppress error in case no syscalls
46 matched the provided qualification.
47 * Implemented decoding of signal mask in rt_sigreturn syscall on alpha, arc,
48 arm, avr32, bfin, cris, hppa, m68k, metag, microblaze, mips, nios2, or1k,
49 powerpc, powerpc64, riscv, sh, sh64, sparc, sparc64, tile, x86, and xtensa
51 * Implemented decoding of statx syscall.
52 * Implemented decoding of NS_* ioctl commands.
53 * Implemented decoding of the remaining V4L2_BUF_TYPE_* types.
54 * Implemented decoding of VIDIOC_[SG]_TUNER ioctl commands.
55 * Implemented decoding of NLMSG_ERROR netlink messages.
56 * Improved decoding of BPF_PROG_ATTACH command of bpf syscall.
57 * Improved decoding of misplaced parts in DM_* ioctl commands.
58 * Updated lists of ioctl commands from Linux 4.11.
61 * Fixed decoding of flags argument of preadv2 and pwritev2 syscalls on x32.
62 * Fixed the number of arguments and tracing flags of alpha specific syscalls.
63 * Fixed decoding of old sigsuspend syscall on alpha, cris, mips, powerpc,
64 powerpc64, sh, sh64, sparc, and sparc64.
65 * Fixed decoding of sgetmask and ssetmask syscalls on 64-bit architectures.
66 * Fixed decoding of netlink messages received within struct msghdr.
67 * Worked around a bug in miscompiled aarch64 kernels leading to the 3rd
68 argument of sched_getattr syscall being not quite 32-bit.
69 * Fixed corner cases of printing inaccessible times argument of utimes
70 and futimesat syscalls.
72 Noteworthy changes in release 4.16 (2017-02-14)
73 ===============================================
76 * Implemented syscall return value injection (-e inject=SET:retval= option).
77 * Implemented signal injection (-e inject=SET:signal= option).
78 * Implemented decoding of SUID_DUMP_* constants in PR_[GS]ET_DUMPABLE.
79 * Implemented decoding of all SG_* ioctl commands.
80 * Implemented decoding of ustat syscall.
81 * Implemented decoding of BPF_OBJ_PIN, BPF_OBJ_GET, BPF_PROG_ATTACH,
82 and BPF_PROG_DETACH commands of bpf syscall.
83 * Enhanced decoding of sg_io_hdr and sg_io_v4 structures.
84 * Enhanced decoding of get_robust_list, getrandom, io_submit, set_robust_list
86 * Enhanced decoding of entities of kernel long type on x32 and mips n32 ABIs.
87 * Updated lists of IP_*, IPV6_*, and LOOP_* constants.
88 * Updated lists of ioctl commands from Linux 4.10.
89 * Added decoding of recently added syscalls on avr32, microblaze, ppc,
93 * Fixed pathmatch of oldselect syscall on 64-bit architectures.
94 * Fixed decoding of mmap2 syscall on s390 when arguments are not available.
95 * Fixed decoding of kexec_file_load, mprotect, pkey_mprotect, prctl, preadv*,
96 and pwritev* syscalls on x32.
97 * Fixed printing of string arguments of getxattr and setxattr syscalls
98 when -s option is used to limit the printed string size.
99 * Fixed decoding of ifconf, ifreq, and loop_info structures on non-native
101 * Fixed decoding of SG_* and LOOP_* ioctl commands.
102 * Fixed build on mips with musl libc.
103 * Fixed cross-building of ioctlsort.
104 * Applied minor formatting fixes to the manual page.
106 Noteworthy changes in release 4.15 (2016-12-14)
107 ===============================================
109 * Changes in behavior
110 * Time stamps are now printed according to ISO 8601.
111 * Changed output format of val3 parameter of futex FUTEX_WAKE_OP operation.
112 * The last argument of mincore, sched_getaffinity, and sched_setaffinity
113 syscalls is now formatted as an array.
116 * Implemented syscall fault injection (-e fault=... option).
117 * Implemented decoding of DM_* ioctl commands.
118 * Implemented decoding of attr parameter of perf_event_open syscall.
119 * Implemented decoding of pkey_alloc, pkey_free, and pkey_mprotect syscalls.
120 * Implemented dumping of mq_timedsend and mq_timedreceive syscalls.
121 * Implemented decoding of PR_SET_FP_MODE and PR_GET_FP_MODE operations
123 * Implemented PTRACE_GETREGS API support on m68k.
124 * Updated lists of ARCH_*, BPF_*, BTRFS_*, FALLOC_*, MS_*, *_MAGIC,
125 and V4L2_* constants.
126 * Updated lists of ioctl commands from Linux 4.9.
127 * Added decoding of recently added syscalls on arc, x32, and xtensa.
128 * Enhanced manual page.
131 * Fixed corner cases in decoding of exit, exit_group, futimesat, getgroups,
132 getresuid, init_module, inotify_init1, kcmp, kexec_load, lookup_dcookie,
133 mq_getsetattr, mq_notify, mq_open, mq_timedreceive, mq_timedsend,
134 name_to_handle_at, prctl, process_vm_readv, process_vm_writev, setfsuid,
135 setgroups, setns, unshare, and utimes syscalls.
136 * Fixed handling of verbose flag in printing of controls array
137 of struct v4l2_ext_controls.
138 * Fixed omission of field names in the output of capability, sigaction,
139 sigevent, statfs, timespec, timeval, and utimbuf structures.
140 * Fixed printing of unknown syscalls in siginfo structure.
141 * Fixed decoding of ioctl constants on m68k.
142 * Fixed cris architecture support.
143 * Fixed cross build when host compiler does not support the same
144 set of warning flags as the cross compiler.
145 * Fixed build on SLE10 and SLE11.
147 Noteworthy changes in release 4.14 (2016-10-04)
148 ===============================================
150 * Changes in behavior
151 * When using -p option without a command and no processes has been attached,
152 strace exits with exit status 1.
155 * Added printing of the mode argument of open and openat syscalls
156 when O_TMPFILE flag is set. (Addresses Fedora bug #1377846).
157 * Enhanced -e abbrev=set, -e raw=set, and -e verbose=set.
158 * Enhanced decoding of futex, keyctl, quotactl, timerfd_settime,
159 and aio family syscalls.
160 * Implemented fetching of the 7th subcall argument on mips o32.
161 * Updated lists of BPF_*, ETH_P_*, KEXEC_ARCH_*, SCTP_*, TCP_*, and *_MAGIC
163 * Updated lists of ioctl commands from Linux 4.8.
164 * Added decoding of new syscalls on sh and sh64.
165 * Added RISC-V architecture support.
168 * Marked io_setup and io_destroy as memory mapping related syscalls.
169 * Fixed leakage of placeholder descriptors to tracees.
170 * Fixed printing of mode_t, umode_t, and umask types.
171 * Fixed decoding of iovec arrays without a limit on total data size.
172 * Fixed decoding of fadvise64, fallocate, futex, keyctl, quotactl, readahead,
173 and ipc family syscalls.
174 * Fixed decoding of invalid syscalls mapped to indirect subcalls.
175 * Fixed decoding of struct btrfs_ioctl_vol_args_v2 on non-native
177 * Fixed decoding of PTRACE_DETACH on sparc and sparc64.
178 * Fixed decoding of struct stat64 on sparc64.
179 * Fixed decoding of uid and gid-related syscalls on sparc64.
180 * Fixed decoding of the forth argument of semctl syscall on sparc64.
181 * Fixed values of tty ioctl constants on sparc64.
182 * Fixed sparc personality support on sparc64.
184 Noteworthy changes in release 4.13 (2016-07-26)
185 ===============================================
188 * Implemented a general netlink socket parser.
189 * Enhanced decoding of socket addresses.
190 * Enhanced decoding of cmsghdr, msghdr, and mmsghdr structures.
191 * Enhanced decoding of accept, accept4, bind, getpeername, getsockname,
192 ipc, recvfrom, recvmsg, recvmmsg, sendto, sendmmsg, and socketcall syscalls.
193 * Updated lists of AF_*, BPF_MAP_TYPE_*, KEY_*, KEYCTL_*, RWF_*, SS_*,
194 and *_MAGIC constants.
195 * Updated lists of ioctl commands from Linux 4.7.
198 * Fixed decoding of pid_t argument of prlimit64 syscall.
199 * Fixed sign extension issues in the parser of struct rusage.
200 * Fixed race condition in decoding of timeout argument of recvmmsg and
201 rt_sigtimedwait syscalls.
202 * Fixed build with fresh linux kernel headers.
204 Noteworthy changes in release 4.12 (2016-05-31)
205 ===============================================
208 * Implemented simultaneous use of -p option and tracing of a command.
209 (addresses Debian bug #549942).
210 * Implemented caching of netlink conversations to reduce amount of time
211 spent in decoding socket details in -yy mode.
212 * Implemented -yy mode decoding of protocol:portid pairs associated with
213 netlink socket descriptors.
214 * Implemented decoding of copy_file_range, preadv2, and pwritev2 syscalls.
215 * Implemented dumping of preadv, preadv2, pwritev, pwritev2, and vmsplice
217 * Implemented decoding of BTRFS_* and UFFDIO_* ioctl commands.
218 * Enhanced decoding of BLK*, EVIOC*, RTC_*, and VIDIOC_* ioctl commands.
219 * Enhanced decoding of fstatfs, fstatfs64, get_mempolicy, getdents,
220 getdents64, getgroups, getpriority, kill, mbind, migrate_pages, mknod,
221 mknodat, personality, poll, ppoll, quotactl, rt_sigpending,
222 rt_sigqueueinfo, rt_sigtimedwait, rt_tgsigqueueinfo, sched_getaffinity,
223 sched_setaffinity, seccomp, set_mempolicy, setgroups, setpriority, statfs,
224 statfs64, tgkill, waitid, and xattr family syscalls.
225 * Enhanced decoding of getxpid, getxuid, and getxgid syscalls on alpha.
226 * Enhanced decoding of pipe syscall on alpha, ia64, mips, sh, and sparc.
227 * Added decoding of bind, listen, and setsockopt direct syscalls on sparc.
228 * Added decoding of osf_statfs64 and osf_fstatfs64 syscalls on alpha.
229 * Added decoding of fadvise64 and fadvise64_64 on s390.
230 * Updated lists of AF_*, BPF_MAP_TYPE_*, CLONE_*, EPOLL*, IPV6_*, MADV_*,
231 MSG_*, PTRACE_*, SEGV_*, SO_*, SOL_*, *_MAGIC, and quotactl constants.
232 * Updated lists of ioctl commands from Linux 4.6.
235 * Fixed build on arc, metag, nios2, or1k, and tile architectures.
236 * Fixed decoding of 32-bit times syscall return value on 64-bit architectures.
237 * Fixed decoding of mlock2 syscall on sparc.
238 * Fixed decoding of osf_shmat syscall on alpha.
239 * Fixed decoding of syscalls unknown to the kernel on s390/s390x.
240 (addresses Debian bug #485979 and Fedora bug #1298294).
241 * Fixed decoding of preadv syscall in case of short read.
242 * Fixed decoding and dumping of readv syscall in case of short read.
243 * Fixed dumping of recvmsg and recvmmsg syscalls in case of short read.
244 * Fixed decoding of mincore syscall's last argument.
245 * Fixed remaining errors in mapping between syscall numbers and numbers
246 of syscall arguments.
247 * Applied various fixes to strace-graph script.
249 Noteworthy changes in release 4.11 (2015-12-21)
250 ===============================================
252 * Changes in behavior
253 * Some syscalls have different names depending on architecture and
254 personality. In these cases, syscall filtering and printing now
255 consistently uses the names that match corresponding __NR_* kernel
256 macros of the tracee's architecture and personality.
257 * Added strace prefix to all diagnostic messages.
260 * Enhanced and extended test suite.
261 * Implemented reliable tracing of processes whose personality differs
262 from the personality of strace, fixed decoding of 32-bit personality
263 syscalls on 64-bit architectures.
264 * When some data referenced by syscall arguments is irrelevant or cannot
265 be read from tracee's memory, strace now prints its address consistently.
266 * When a syscall is restarted using restart_syscall mechanism, strace now
267 shows the syscall name on architectures that expose this information.
268 * Print values returned by epoll_create1, eventfd, eventfd2, fanotify_init,
269 inotify_init1, perf_event_open, pipe, pipe2, signalfd, signalfd4, socket,
270 socketpair, timerfd, and timerfd_create syscalls, as well as F_DUPFD and
271 F_DUPFD_CLOEXEC fcntl commands, as file descriptors.
272 * Optimized decoding of indirect socket syscalls.
273 * Implemented decoding of nanoseconds along with seconds in stat family
274 syscalls (addresses Fedora bug #1251176).
275 * Implemented decoding of struct statfs.f_flags in statfs syscall.
276 * Implemented decoding of siginfo_t.si_syscall and siginfo_t.si_arch
278 * Implemented decoding of indirect syscall on mips o32.
279 * Implemented decoding of IPPROTO_IP control messages.
280 * Implemented decoding of setsockopt syscall multicast arguments.
281 * Enhanced decoding of struct sigevent.
282 * Enhanced decoding of block, loop, mtd, ptp, rtc, SG_IO, socket, tty,
283 and v4l2 ioctl syscall arguments.
284 * Enhanced decoding of epoll_create, fcntl, fcntl64, futex, getdents,
285 getdents64, getsockopt, io_*, mount, msgctl, prctl, quotactl, recvfrom,
286 sendfile, setsockopt, and shmctl syscalls.
287 * Implemented decoding of bpf, execveat, ioperm, iopl, kcmp, kexec_file_load,
288 lookup_dcookie, membarrier, memfd_create, mlock2, name_to_handle_at,
289 open_by_handle_at, sched_getattr, sched_setattr, and userfaultfd syscalls.
290 * Updated lists of AF_*, EPOLL_*, FALLOC_FL_*, F_*, INPUT_PROP_*, IPPROTO_*,
291 IPV6_*, IP_*, KEY_*, LOCK_*, MNT_*, MS_*, PACKET_*, PERF_FLAG_*, PF_*,
292 PR_*, PTRACE_O_*, RENAME_*, SCTP_*, SECBIT_*, SO_*, TCP_*, and siginfo_t
294 * Added Nios II architecture support.
295 * Added new syscall entries to match Linux 4.4.
298 * Fixed potential short read of strings from tracee's memory.
299 * Fixed -qq option in conjunction with -o option.
300 * Fixed filtering of <unavailable> syscalls.
301 * Fixed decoding of ioctl syscall command on aarch64 and 32-bit architectures
302 with 64-bit aligned structures.
303 * Fixed decoding of eventfd2, epoll_create1, signalfd4, and sync_file_range2
304 syscall flags arguments.
305 * Fixed decoding of 4th argument of clock_nanosleep syscall.
306 * Fixed decoding of getpagesize syscall on m68k.
307 * Fixed decoding of getrandom and seccomp syscalls on aarch64.
308 * Fixed decoding of timezone argument of gettimeofday and settimeofday
310 * Fixed decoding of offset argument of mmap2 syscall on arm, sparc,
312 * Fixed decoding of pipe syscall on alpha and mips.
313 * Fixed decoding of pipe2 syscall on ia64, sh, sparc, and sparc64.
314 * Fixed decoding of signal mask argument of pselect6 syscall on x32.
315 * Fixed decoding of signal mask of rt_sigreturn syscall on aarch64, m68k,
317 * Fixed decoding of 4th argument of semctl indirect syscall.
318 * Fixed decoding of sa_restorer and sa_mask of sigaction syscall on m68k.
319 * Fixed decoding of statfs64 and fstatfs64 syscalls on arm eabi.
320 * Fixed decoding of struct dirent on x32.
321 * Fixed decoding of times syscall return value on mips n32 and x32.
322 * Fixed decoding of path argument of umount2 syscall
323 (addresses Debian bug #785050).
324 * Worked around a kernel bug in tracing privileged executables.
325 * Fixed various errors in mapping between syscall numbers and associated
326 information like the number of syscall arguments, the name of syscall,
329 Noteworthy changes in release 4.10 (2015-03-06)
330 ===============================================
333 * Added -yy option to print protocol and address information associated with
335 * Extended "-e read=set" and "-e write=set" options to cover sendmsg,
336 recvmsg, sendmmsg, and recvmmsg syscalls.
337 * Implemented full 32-bit decoding of ioctl commands
338 (addresses Debian bug #692913 and Fedora bug #902788).
339 * Implemented PTRACE_GETREGS API support on ia64.
340 * Implemented PTRACE_GETREGS API support on mips.
341 * Implemented PTRACE_GETREGSET API support on s390/s390x.
342 * Implemented decoding of getrandom and seccomp syscalls.
343 * Implemented full decoding of 64-bit capability sets.
344 * Implemented decoding of all prctl commands.
345 * Implemented decoding of parametrized ioctl commands.
346 * Implemented decoding of evdev ioctl commands.
347 * Implemented decoding of v4l ioctl commands.
348 * Implemented decoding of SG_IO v4 ioctl commands.
349 * Implemented decoding of FIFREEZE/FITHAW/FITRIM ioctl commands.
350 * Implemented decoding of FALLOC_FL_* fallocate flags.
351 * Implemented decoding of rt_sigreturn signal mask on aarch64,
353 * Enhanced socket decoder to support bluetooth sockets.
354 * Enhanced decoding of unlisted ioctl commands.
355 * Enhanced decoding of getsockopt and setsockopt syscall.
356 * Enhanced decoding of sysinfo syscall.
357 * Enhanced decoding of struct cmsghdr.
358 * Enhanced decoding of wait status.
359 * Enhanced aio support on non-x86 architectures by using external libaio.h.
360 * Added O_TMPFILE to the list of recognized open mode flags.
361 * Updated the list of filesystem type constants that is used in decoding
362 statfs family syscalls.
363 * Updated lists of CAP_*, PR_*, PTRACE_*, SCHED_*, SO_*, SOL_*, SWAP_FLAG_*,
365 * Updated lists of signal constants from Linux 3.19.
366 * Updated lists of errno constants from Linux 3.19.
367 * Updated lists of ioctl commands from Linux 3.9.
368 * Added new syscall entries to match Linux 3.19.
371 * Fixed various errors in mapping between syscall numbers and associated
372 information like the number of syscall arguments, the name of syscall,
374 * Fixed quoting issues in printing descriptors, filenames, network interface
375 names, struct utsname members, device/volume names of BLK* ioctl commands.
376 * Fixed uid_t/git_t decoding.
377 * Fixed potential out-of-bounds read issues in getdents/getdents64 decoders.
378 * Fixed potential open flags truncation on some architectures.
379 * Fixed decoding of struct ifreq.ifr_name.
380 * Fixed decoding of SIOCSIFNAME ioctl command.
381 * Fixed decoding of RENAME_* renameat2 flags.
382 * Fixed decoding of UTIME_NOW/UTIME_OMIT timeval structures.
383 * Fixed decoding of indirect ipc subcalls on some architectures.
384 * Fixed decoding of fanotify_mark syscall on 32-bit architectures.
385 * Fixed decoding of 32-bit stat structures on 64-bit architectures.
386 * Fixed decoding of 32-bit struct cmsghdr on 64-bit architectures.
387 * Fixed decoding of 32-bit preadv/pwritev offset on 64-bit architectures.
388 * Fixed decoding of sigreturn/rt_sigreturn signal mask on ia64, ppc, ppc64,
389 sparc, sparc64, mips, and s390.
390 * Fixed instruction pointer output (-i option) on architectures that support
391 several personalities.
392 * Fixed behaviour of "-e read=set" and "-e write=set" when read and write
394 * Fixed build on systems where struct sigaction has no sa_restorer member.
395 * Fixed build with uclibc and musl libc.
398 * Linux kernel >= 2.5.46 is required.
399 Older versions without a decent PTRACE_SETOPTIONS support will not work.
400 * On mips, linux kernel >= 2.6.15 is required.
401 Older versions without a decent PTRACE_GETREGS support will not work.
402 * On s390 and s390x, linux kernel >= 2.6.27 is required.
403 Older versions without a decent PTRACE_GETREGSET support will not work.
405 Noteworthy changes in release 4.9 (2014-08-15)
406 ==============================================
408 * Changes in behavior
409 * Disabled OABI support on ARM EABI systems by default,
410 added --enable-arm-oabi option to enable it at configure time.
413 * Added experimental -k option to print stack trace after each traced syscall.
414 * Added -w option to produce stats on syscall latency.
415 (addresses Debian bug #457497).
416 * Added ARC architecture support.
417 * Added PTRACE_GETREGS API support on PowerPC.
418 * Enhanced Bionic libc and musl libc support.
419 * Enhanced tracing of x86 personality processes on x86_64 and x32.
420 * Enhanced tracing of ARM personality processes on AArch64.
421 * Enhanced 32/64bit personality detection on PowerPC.
422 * Implemented decoding of add_key, ioprio_get, ioprio_set, kexec_load, keyctl,
423 renameat2, and request_key syscalls.
424 * Robustified decoding of select, pselect, and io_submit syscalls.
425 * Enhanced decoding of delete_module, fanotify_init, fanotify_mark, fcntl,
426 setdomainname, sethostname, setns, and sync_file_range syscalls.
427 * Enhanced decoding of signal bitmasks.
428 * Enhanced decoding of file descriptors.
429 * Enhanced siginfo_t decoding.
430 * Enhanced PF_NETLINK decoding.
431 * Updated CLOCK_* constants
432 (addresses Fedora bug #1088455).
433 * Added new syscall entries to match Linux 3.16.
436 * Added shmat and shmdt to the set of memory mapping related syscalls.
437 * Fixed detaching from stopped processes.
438 * Fixed fanotify_mark decoding on 32bit architectures.
439 * Fixed offset decoding in preadv and pwritev syscalls.
440 * Fixed select decoding for glibc in _FORTIFY_SOURCE mode.
441 * Fixed decoding of epoll_ctl syscall with EPOLL_CTL_DEL argument.
442 * Fixed build when <sys/ptrace.h> and <linux/ptrace.h> conflict
443 (addresses Fedora bug #993384).
444 * Miscellaneous corrections in the manual page.
445 (Addresses Debian bug #725987).
447 Noteworthy changes in release 4.8 (2013-06-03)
448 ==============================================
450 * Changes in behavior
451 * In case of normal strace termination, when the trace output is
452 redirected to a pipe, strace now closes it and waits for the pipe
453 process termination before exit.
456 * Implemented tracing using PTRACE_SEIZE API (when available).
457 * Implemented more reliable PTRACE_GETREGSET-based process personality
458 detection on x86-64 and x32 (when available).
459 * Added -e trace=memory option for tracing memory mapping related syscalls.
460 * Documented -b option.
461 * Allowed exit status messages to be suppressed by giving -q option twice.
462 * Added AArch64 architecture support
463 (addresses Debian bug #693074 and Fedora bug #969858).
464 * Added support for OpenRISC 1000, Meta, and Xtensa architectures.
465 * Added tilegx personality support for Tile.
466 * Enhanced support of NOMMU architectures.
467 * Enhanced decoding of getdents, mmap, perf_event_open, ptrace, and
469 * Added new syscall entries to match Linux 3.9.
470 * Regenerated the list of common ioctl names from Linux 3.9.
471 * Updated the list of errno constants.
472 * Updated lists of AF_*, MADV_*, MAP_*, MSG_*, MS_*, PF_*, PR_*,
473 PTRACE_O_*, and TCP_* constants.
474 * Implemented decoding of UBI ioctls.
475 * Removed redundant "*32" ioctl names.
478 * Fixed ERESTARTNOINTR leaking to userspace on ancient kernels
479 (addresses Fedora bug #659382).
480 * Fixed kernel release string parsing
481 (addresses Debian bug #702309).
482 * Fixed decoding of *xattr syscalls
483 (addresses Fedora bug #885233).
484 * Fixed handling of files with 64-bit inode numbers by 32-bit strace
485 (addresses Fedora bug #912790).
486 * Fixed tracing forks on SPARC.
487 * Fixed decoding of fadvise64, fallocate, ftruncate64, io_submit, pread,
488 preadv, pwrite, pwritev, readahead, sigaltstack, sync_file_range, sysctl,
489 and truncate64 syscalls.
490 * Fixed categories of multiple syscalls on most of supported architectures.
491 * Fixed decoding of non-native 32-bit personality recv[m]msg syscalls.
492 * Fixed decoding of multiple 32-bit personality syscalls on x32.
493 * Fixed decoding of long long syscall arguments on ARM, MIPS/o32, PowerPC,
494 S390x, and Tile architectures.
495 * Fixed semtimedop decoding on S390x.
496 * Fixed sram_alloc decoding on Blackfin.
497 * Fixed build when process_vm_readv is a stab.
498 * Fixed build with older versions of libaio.h.
500 Noteworthy changes in release 4.7 (2012-05-02)
501 ==============================================
503 * Changes in behavior
504 * strace no longer suspends waitpid until there is a child
505 for waitpid'ing process to collect status from.
506 * strace no longer detaches from a tracee which is supposed
508 * strace now issues a new message: "+++ exited with EXITCODE +++"
509 which shows exact moment strace got exit notification,
510 analogous to existing "+++ killed by SIG +++" message.
513 * Added x32 personality support (x86_64 architecture).
514 * Added -y and -P options to print file descriptor paths and
515 filter by those paths.
516 * Added -I option to control strace interactivity.
517 * Allowed -p option to take comma or whitespace-separated list of PIDs.
518 * Added strace_log_merge script helper to merge timestamped "strace -ff"
520 * Implemented decoding of clock_adjtime, get_robust_list, migrate_pages,
521 preadv, prlimit64, process_vm_readv, process_vm_writev, pwritev,
522 recvmmsg, recvmsg, rt_tgsigqueueinfo, sendmmsg, setns, set_robust_list,
523 sched_rr_get_interval, splice, syslog, tee and vmsplice syscalls.
524 * Enhanced decoding of capget, capset, getrlimit, flistxattr, io_submit,
525 listxattr, setrlimit and swapon syscalls.
526 * Implemented decoding of loop and mtd ioctls.
527 * Added syscall entries for new linux syscalls.
528 * Added syscall entries for direct socket system calls on powerpc.
529 * Updated the list of errno constants.
530 * Updated lists of MSG_*, STA_*, and TCP_* constants.
531 * Regenerated the list of ioctl names from Linux 3.3.
532 * Enhanced switching between processes with different personalities.
533 * Enhanced signals reporting by using short signal names.
534 * Made ERESTART* messages more descriptive.
535 * Made parsing of numbers from strings more robust.
536 * Added support for compat_statfs64 and statfs64.f_flags.
537 * Changed read of data blocks to use single process_vm_readv syscall
538 (when available) instead of several PTRACE_PEEKDATA operations.
539 * Changed read of registers on x86 and x86-64 to use single PTRACE_GETREGS
540 operation instead of several PTRACE_PEEKUSER operations.
541 * Applied various optimizations to make strace work faster.
544 * Implemented proper handling of real SIGTRAPs on kernels supporting
545 PTRACE_O_TRACESYSGOOD.
546 (Addresses Fedora bug #162774).
547 * Fixed sockaddr_un.sun_path name in decoded output.
548 (Addresses Debian bug #554946).
549 * Fixed to avoid potential core file clobbering on exit.
550 (Addresses Debian bug #656398).
551 * Fixed a typo in documentation.
552 (Addresses Debian bug #653309).
553 * Fixed decoding of timer id returned by timer_create.
554 * Fixed epoll_create1, epoll_wait and epoll_pwait decoding.
555 * Fixed *at syscalls flags decoding.
556 * Fixed ARM EABI 64-bit syscall's arguments decoding.
557 * Fixed semtimedop decoding on s390.
558 * Fixed osf_sigprocmask decoding on alpha.
559 * Fixed ipc and socket subcall decoding on several architectures.
560 * Corrected syscall entries for epoll_pwait, epoll_create, epoll_ctl,
561 epoll_wait, mincore, mlockall, prctl, reboot, sendfile, sendfile64,
562 sendmsg, sgetmask, ssetmask, swapon, tgkill and tkill syscalls.
563 * Corrected io_* syscall entries on ARM.
564 * Fixed PID prefix printing in "strace -oLOG -ff -p1 -p2 -p3" case.
565 * Fixed logging of unfinished lines in "strace -oLOG -ff" case.
566 * Fixed build when libaio-devel is not available.
567 * Fixed configure checks for PTRACE_* constants.
568 * Fixed compilation warnings remained on several architectures.
571 * Removed all non-Linux code. After years of neglect, that dead code
572 just hampered further strace development.
573 * Linux kernel >= 2.6.18 is recommended. Older versions might still
574 work but they haven't been thoroughly tested with this release.
576 Noteworthy changes in release 4.6 (2011-03-15)
577 ==============================================
579 * Changes in behavior
580 * Print diagnostic information about changes in personality mode to
581 standard error instead of standard output.
584 * Implemented a new method of following clone, fork, and vfork
585 syscalls using the Linux kernel's explicit facilities for tracing
586 creation of threads and child processes.
587 * Implemented CLONE_PARENT and CLONE_UNTRACED flags handling.
588 * Implemented decoding of TLS syscalls on m68k.
589 * Implemented biarch support on powerpc64.
590 * Implemented biarch support for getrlimit() and setrlimit().
591 * Implemented decoding of struct ucred in getsockopt SO_PEERCRED.
592 * Implemented SOL_SCTP socket options decoding.
593 * Added HDIO_* ioctl names.
594 (Addresses Debian bug #450953).
595 * Added LOOP_* ioctl names.
596 * Updated lists of CLOCK_*, CLONE_*, MS_*, and SOL_* constants
597 to match Linux 2.6.37.
598 * Updated the list of IPPROTO_* constants to match netinet/in.h.
599 * Implemented decoding of HDIO_* and BLK* ioctls.
600 * Added MicroBlaze architecture support.
601 * Added new syscall entries to match Linux 2.6.37.
602 * Regenerated list of ioctl names from Linux 2.6.37.
603 * Enhanced signal notification decoding.
604 * Documented -C and -D options.
607 * Fixed fetching syscall arguments on m68k.
608 * Fixed an error when judging whether a process has children.
609 * Fixed get/set_robust_list syscall numbers for powerpc.
610 * Fixed a corner case in printing clone flags.
611 * Fixed cross-compiling issues.
612 * Fixed build issues on powerpc64, SH and SPARC.
613 * Fixed syscall flags of fstatat*, mmap, mmap2, fadvise64*, swapoff,
614 fgetxattr, flistxattr, fremovexattr, epoll_create, fallocate,
615 fanotify_init, and fanotify_mark syscalls.
616 * Fixed decoding of get[ug]id, gete[ug]id and setfs[ug]id return values.
617 * Fixed biarch support in IO dumping.
618 * Fixed raw exit_group decoding.
619 * Fixed decoding of file descriptors on 64-bit architectures.
620 * Fixed a corner case in waitpid handling.
621 (Addresses Red Hat bug #663547).
622 * Fixed stat64 decoding on mips
623 (Addresses Debian bug #599028).
624 * Fixed misleading italics in the manual page.
625 (Addresses Debian bug #589323).
627 Noteworthy changes in release 4.5.20 (2010-04-13)
628 =================================================
631 * Implemented decoding of new linux syscalls: inotify_init1, recvmmsg.
632 * Implemented basic decoding of new linux syscalls: preadv, pwritev,
633 rt_tgsigqueueinfo, perf_event_open.
634 * Enhanced decoding of recently added syscalls on non-x86 architectures
635 by replacing a bare decoder with elaborate parsers enabled earlier
637 * Implemented -C option to combine regular and -c output.
638 (Addresses Debian bug #466196)
639 * Enhanced decoding of mbind and mremap syscalls.
640 * Enhanced SOL_PACKET socket options decoding.
641 * Regenerated list of ioctl names from linux 2.6.33.
642 * Added TILE architecture support.
645 * Fixed build with Linux kernel headers 2.6.32-rc5+.
646 (Addresses Debian bug #560516 and Fedora bug #539044)
647 * Fixed build on mips.
648 * Fixed handling of Linux systems without struct statfs64.
649 * Fixed reporting signal mask by sigreturn on powerpc.
650 * Fixed potential stack buffer overflow in select decoder.
651 (Addresses Fedora bug #556678)
652 * Corrected msgsnd indirect ipccall decoding.
653 * Corrected decoding of 64bit syscalls.
654 (Addresses Debian bug #570603)
655 * Corrected getsockopt decoding on architectures where
656 sizeof(long) > sizeof(int).
657 (Addresses Debian bug #494844)
658 * Corrected decoding of epoll_pwait.
659 (Addresses Debian bug #513014)
660 * Corrected handling of killed threads.
662 Noteworthy changes in release 4.5.19 (2009-10-21)
663 =================================================
665 * Changes in behavior
666 * When command exits, strace now exits with the same exit status.
667 If command is terminated by a signal, strace terminates itself
668 with the same signal, so that strace can be used as a wrapper
669 process transparent to the invoking parent process.
670 When using -p option, the exit status of strace is zero unless
671 there was an unexpected error in doing the tracing.
672 (Addresses Fedora bug #105371 and Debian bug #37665)
675 * Implemented decoding of new Linux syscalls: accept4, dup3,
676 epoll_create1, eventfd2, inotify_init1, pipe2, signalfd4.
677 * Implemented decoding of socket type flags introduced in Linux 2.6.27.
678 * Implemented decoding of accept4 socketcall.
679 * Enhanced prctl decoding.
680 * Enhanced nanosleep decoding.
681 * Enhanced ptrace decoding.
682 * Enhanced futex decoding.
683 * Enhanced CAP_* decoding.
684 * Enhanced SIOCS* ioctls decoding.
685 * Enhanced fcntl F_* flags decoding.
686 * Enhanced semop/semtimedop decoding.
687 * Updated ARM architecture support.
688 * Added Blackfin architecture support.
689 * Added AVR32 architecture support.
690 * Added CRIS architecture support.
691 * Made strace detect when traced process suddenly disappeared.
694 * Fixed syscall numbers for tee and sync_file_range.
695 (Addresses Debian bug #503124)
696 * Fixed several bugs in strings decoder, including potential heap
698 (Addresses Fedora bugs #470529, #478324 and #511035)
699 * Marked sendfile(2) as a network syscall.
700 (Addresses Debian bug #509499)
701 * Fixed accept(2) decoding.
702 (Addresses Debian bug #507573)
703 * Fixed sigtimedwait(2) decoding.
704 * Fixed build on ARM EABI.
705 (Addresses Debian bugs #520084 and #535564, and Fedora bug #507576)
706 * Fixed display of 32-bit fcntl(F_SETLK) on 64-bit architectures.
707 (Addresses Red Hat bug #471169)
708 * Fixed display of 32-bit argv array on 64-bit architectures.
709 (Addresses Fedora bug #519480)
710 * Fixed display of 32-bit struct sigaction on 64-bit architectures.
711 * Fixed HPPA architecture support.
712 (Addresses Debian bugs #437928 and #546619)
717 * Support new Linux/PPC system call subpage_prot and PROT_SAO flag.
718 * In sigaction system call, display sa_flags value along with SIG_DFL/SIG_IGN.
723 * -F is now deprecated, -f has traced vfork too on Linux for a long time now.
724 * Print O_CLOEXEC, MSG_CMSG_CLOEXEC flag bits.
725 * Improved output for prctl system call on Linux.
726 * Improved support for Linux/ARM.
727 * SA_NOMASK is now spelled SA_NODEFER, and SA_ONESHOT is spelled SA_RESETHAND.
732 * Improved output for delete_module, futex, and mbind system calls on Linux.
733 * Improved output for SG_IO ioctls on Linux.
734 * Support new Linux system calls move_pages, utimensat, signalfd, timerfd,
735 eventfd, getcpu, epoll_pwait.
740 * Several biarch improvements.
741 * Improved output for adjtimex, sysctl, quotactl, mount, umount.
742 * Support new Linux system calls *at, inotify*, pselect6, ppoll and unshare.
747 * Accept numeric system calls in -e.
752 * Introduce "-e trace=desc".
757 * Better x86-64 support for IA32 processes.
758 * Update PowerPC system calls.
759 * Better printing for Linux aio system calls.
763 * Quick fix release for build issues.
764 * One fix for Linux/ARM system call table.
769 * Print fault address for SIGSEGV/SIGBUS signals when available.
774 * Improve socket ioctl printing.
775 * Update Linux/IA64 syscall list.
776 * Fix Linux/x86-64 syscall argument extraction for 32-bit processes.
777 * Improve mount flags printing.
778 * Support symbolic printing of x86_64 arch_prctl parameters.
783 * Update syscall tables for Alpha, ARM, HPPA.
784 * Support new Linux syscalls mbind, set_mempolicy, get_mempolicy, waitid.
785 * Support Linux syscalls fadvise64, fadvise64_64, and epoll_*.
786 * Improve ioctl command name matching.
787 * Print RTC_* ioctl structure contents.
788 * Support newer RLIMIT_* values.
789 * Print struct cmsghdr details in sendmsg.
794 * Print attribute values in *xattr system calls on Linux.
795 * Include pread and pwrite calls in -e read and -e write tracing.
796 * Update SO_* and IP_* value lists and add IPV6_* values for socket options.
797 * Print clock_t values symbolically in Linux clock_* system calls.
801 * Bug fixes, Linux ioctl updates.
802 * David Miller contributed support for Linux/SPARC64.
810 * Update Linux ioctl lists.
811 * Update PF_* and AF_* value lists.
812 * The 4.5.3 -p behavior for NPTL threads applies only under -f, and got fixed.
817 * On Linux using NPTL threads, -p will now attach to all threads in a process.
818 * Handle new mq_* system calls in Linux 2.6.6 and later.
823 * Report some new VM_* bit values on Linux.
824 * Better output for Linux sched_* system calls.
829 * Display multiple ioctl name matches on Linux.
833 * New port to AMD's x86-64 architecture. One strace binary can
834 handle both new x86-64 and old i386 processes.
835 * Fixed support for LFS64 calls.
836 * New switch -E to add/remove environment variables for the command.
837 * Merged s390/s390x port.
838 * Trace an unbounded number of processes.
839 * Handle numerous new system calls in Linux 2.5, and new threads semantics.
840 * Fixed bugs with attach/detach leaving things stopped.
841 * Fixed traced process seeing ECHILD despite live, traced children
842 in waitpid calls with WNOHANG.
843 * Stuart Menefy contributed a port to Linux/SH.
844 * Stephen Thomas contributed a port to Linux/SH64.
845 * Many other bug fixes.
849 * Fix Linux/ia64 support, looks like someone renamed a few things on us
850 * Fix the ioctl setup for Linux, turned out it did not really work.
851 Improve the ioctl extractor as well so we decode some more ones.
855 * compile fixes for Linux/mips
859 * Linux ia64 and hppa ports added
860 * The usual Linux syscall updates (includes 32bit uid/gid support),
861 * Linux ioctl list updated
862 * Support IPv6 scope ids
863 * FreeBSD/i386 port added
864 * UnixWare and Solaris updates
865 * Better support for tracing multithreaded processes in Linux
869 * Compiles on glibc2.0 systems again
870 * Linux/S390 port added
871 * The usual Linux syscall updates
872 * we can follow fork on arm now
876 * Linux/MIPS port added
877 * Lots of Linux updates again
878 * Improved IPv6 support
884 * Compiles on glibc2.0 systems again
888 * Get stat structure properly on Linux 64bit archs
889 * Personalities work again
890 * Compile correctly on SunOS again
896 * Linux (ultra)sparc fixes
903 * add support for more Linux architectures (powerpc, sparc, arm)
904 * support lots more Linux syscalls
905 * fix signal handling
906 * add IPX and IPIP support
907 * check stray syscall after execv
908 * fix hanging children
910 Changes in version 3.1
911 ======================
914 * Linux 68k is supported
915 * Linux alpha is supported
916 * configure is upgraded to autoconf 2.x
917 * using -f in combination with -e now works correctly
918 * output can be piped to a program
919 * tracing setuid programs works better
920 * it is now reasonable to install strace setuid to root in some circumstances
921 * new useful tracing names like file and process to trace whole
922 classes of system calls, e.g. -efile traces all system calls that
923 take a file name as an argument
924 * IPC calls on SunOS 4.1.x are decoded
925 * Linux program memory is reliably dereferenced
926 * Linux decodes at least the name of all syscalls as of pre2.0.4
927 * various cosmetic changes and bug fixes
929 Changes from versions 2.x to version 3.0
930 ========================================
932 * filename arguments are neither abbreviated nor stringified
933 * string arguments are now true C strings using octal instead of hex by default
934 * preprocessor constants are never shortened (e.g. was RDONLY => now O_RDONLY)
935 * by default the output for multiple processes now goes into one file
936 * all structures, vectors, bitsets, etc. use consistent output formats
937 * the -c option now means count calls, -i does what the old -c used to do
939 New Features in version 3.0
940 ===========================
942 * non-ascii strings can be optionally printed entirely in hex
943 * the output format is readable when multiple processes are generating output
944 * exit values are printed in an alignment column
945 * is is possible to suppress messages about attaching and detaching
946 * various tracing features can be enabled on a per syscall/signal/desc basis
947 * selective tracing of syscalls
948 * selective printing of syscall structures
949 * selective abbreviation of long structures on a per syscall basis
950 * selective printing of raw syscall arguments and results
951 * selective tracing of signals
952 * selective dumping of all I/O read from file descriptors
953 * selective dumping of all I/O written to file descriptors
954 * optional counting of time, calls, and errors for each syscall
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