1 Noteworthy changes in release ?.?? (????-??-??)
2 ===============================================
5 * Enhanced decoding of sched_setattr syscall.
8 * Fixed decoding of flags argument of preadv2 and pwritev2 syscalls on x32.
10 Noteworthy changes in release 4.16 (2017-02-14)
11 ===============================================
14 * Implemented syscall return value injection (-e inject=SET:retval= option).
15 * Implemented signal injection (-e inject=SET:signal= option).
16 * Implemented decoding of SUID_DUMP_* constants in PR_[GS]ET_DUMPABLE.
17 * Implemented decoding of all SG_* ioctl commands.
18 * Implemented decoding of ustat syscall.
19 * Implemented decoding of BPF_OBJ_PIN, BPF_OBJ_GET, BPF_PROG_ATTACH,
20 and BPF_PROG_DETACH commands of bpf syscall.
21 * Enhanced decoding of sg_io_hdr and sg_io_v4 structures.
22 * Enhanced decoding of get_robust_list, getrandom, io_submit, set_robust_list
24 * Enhanced decoding of entities of kernel long type on x32 and mips n32 ABIs.
25 * Updated lists of IP_*, IPV6_*, and LOOP_* constants.
26 * Updated lists of ioctl commands from Linux 4.10.
27 * Added decoding of recently added syscalls on avr32, microblaze, ppc,
31 * Fixed pathmatch of oldselect syscall on 64-bit architectures.
32 * Fixed decoding of mmap2 syscall on s390 when arguments are not available.
33 * Fixed decoding of kexec_file_load, mprotect, pkey_mprotect, prctl, preadv*,
34 and pwritev* syscalls on x32.
35 * Fixed printing of string arguments of getxattr and setxattr syscalls
36 when -s option is used to limit the printed string size.
37 * Fixed decoding of ifconf, ifreq, and loop_info structures on non-native
39 * Fixed decoding of SG_* and LOOP_* ioctl commands.
40 * Fixed build on mips with musl libc.
41 * Fixed cross-building of ioctlsort.
42 * Applied minor formatting fixes to the manual page.
44 Noteworthy changes in release 4.15 (2016-12-14)
45 ===============================================
48 * Time stamps are now printed according to ISO 8601.
49 * Changed output format of val3 parameter of futex FUTEX_WAKE_OP operation.
50 * The last argument of mincore, sched_getaffinity, and sched_setaffinity
51 syscalls is now formatted as an array.
54 * Implemented syscall fault injection (-e fault=... option).
55 * Implemented decoding of DM_* ioctl commands.
56 * Implemented decoding of attr parameter of perf_event_open syscall.
57 * Implemented decoding of pkey_alloc, pkey_free, and pkey_mprotect syscalls.
58 * Implemented dumping of mq_timedsend and mq_timedreceive syscalls.
59 * Implemented decoding of PR_SET_FP_MODE and PR_GET_FP_MODE operations
61 * Implemented PTRACE_GETREGS API support on m68k.
62 * Updated lists of ARCH_*, BPF_*, BTRFS_*, FALLOC_*, MS_*, *_MAGIC,
64 * Updated lists of ioctl commands from Linux 4.9.
65 * Added decoding of recently added syscalls on arc, x32, and xtensa.
66 * Enhanced manual page.
69 * Fixed corner cases in decoding of exit, exit_group, futimesat, getgroups,
70 getresuid, init_module, inotify_init1, kcmp, kexec_load, lookup_dcookie,
71 mq_getsetattr, mq_notify, mq_open, mq_timedreceive, mq_timedsend,
72 name_to_handle_at, prctl, process_vm_readv, process_vm_writev, setfsuid,
73 setgroups, setns, unshare, and utimes syscalls.
74 * Fixed handling of verbose flag in printing of controls array
75 of struct v4l2_ext_controls.
76 * Fixed omission of field names in the output of capability, sigaction,
77 sigevent, statfs, timespec, timeval, and utimbuf structures.
78 * Fixed printing of unknown syscalls in siginfo structure.
79 * Fixed decoding of ioctl constants on m68k.
80 * Fixed cris architecture support.
81 * Fixed cross build when host compiler does not support the same
82 set of warning flags as the cross compiler.
83 * Fixed build on SLE10 and SLE11.
85 Noteworthy changes in release 4.14 (2016-10-04)
86 ===============================================
89 * When using -p option without a command and no processes has been attached,
90 strace exits with exit status 1.
93 * Added printing of the mode argument of open and openat syscalls
94 when O_TMPFILE flag is set. (Addresses Fedora bug #1377846).
95 * Enhanced -e abbrev=set, -e raw=set, and -e verbose=set.
96 * Enhanced decoding of futex, keyctl, quotactl, timerfd_settime,
97 and aio family syscalls.
98 * Implemented fetching of the 7th subcall argument on mips o32.
99 * Updated lists of BPF_*, ETH_P_*, KEXEC_ARCH_*, SCTP_*, TCP_*, and *_MAGIC
101 * Updated lists of ioctl commands from Linux 4.8.
102 * Added decoding of new syscalls on sh and sh64.
103 * Added RISC-V architecture support.
106 * Marked io_setup and io_destroy as memory mapping related syscalls.
107 * Fixed leakage of placeholder descriptors to tracees.
108 * Fixed printing of mode_t, umode_t, and umask types.
109 * Fixed decoding of iovec arrays without a limit on total data size.
110 * Fixed decoding of fadvise64, fallocate, futex, keyctl, quotactl, readahead,
111 and ipc family syscalls.
112 * Fixed decoding of invalid syscalls mapped to indirect subcalls.
113 * Fixed decoding of struct btrfs_ioctl_vol_args_v2 on non-native
115 * Fixed decoding of PTRACE_DETACH on sparc and sparc64.
116 * Fixed decoding of struct stat64 on sparc64.
117 * Fixed decoding of uid and gid-related syscalls on sparc64.
118 * Fixed decoding of the forth argument of semctl syscall on sparc64.
119 * Fixed values of tty ioctl constants on sparc64.
120 * Fixed sparc personality support on sparc64.
122 Noteworthy changes in release 4.13 (2016-07-26)
123 ===============================================
126 * Implemented a general netlink socket parser.
127 * Enhanced decoding of socket addresses.
128 * Enhanced decoding of cmsghdr, msghdr, and mmsghdr structures.
129 * Enhanced decoding of accept, accept4, bind, getpeername, getsockname,
130 ipc, recvfrom, recvmsg, recvmmsg, sendto, sendmmsg, and socketcall syscalls.
131 * Updated lists of AF_*, BPF_MAP_TYPE_*, KEY_*, KEYCTL_*, RWF_*, SS_*,
132 and *_MAGIC constants.
133 * Updated lists of ioctl commands from Linux 4.7.
136 * Fixed decoding of pid_t argument of prlimit64 syscall.
137 * Fixed sign extension issues in the parser of struct rusage.
138 * Fixed race condition in decoding of timeout argument of recvmmsg and
139 rt_sigtimedwait syscalls.
140 * Fixed build with fresh linux kernel headers.
142 Noteworthy changes in release 4.12 (2016-05-31)
143 ===============================================
146 * Implemented simultaneous use of -p option and tracing of a command.
147 (addresses Debian bug #549942).
148 * Implemented caching of netlink conversations to reduce amount of time
149 spent in decoding socket details in -yy mode.
150 * Implemented -yy mode decoding of protocol:portid pairs associated with
151 netlink socket descriptors.
152 * Implemented decoding of copy_file_range, preadv2, and pwritev2 syscalls.
153 * Implemented dumping of preadv, preadv2, pwritev, pwritev2, and vmsplice
155 * Implemented decoding of BTRFS_* and UFFDIO_* ioctl commands.
156 * Enhanced decoding of BLK*, EVIOC*, RTC_*, and VIDIOC_* ioctl commands.
157 * Enhanced decoding of fstatfs, fstatfs64, get_mempolicy, getdents,
158 getdents64, getgroups, getpriority, kill, mbind, migrate_pages, mknod,
159 mknodat, personality, poll, ppoll, quotactl, rt_sigpending,
160 rt_sigqueueinfo, rt_sigtimedwait, rt_tgsigqueueinfo, sched_getaffinity,
161 sched_setaffinity, seccomp, set_mempolicy, setgroups, setpriority, statfs,
162 statfs64, tgkill, waitid, and xattr family syscalls.
163 * Enhanced decoding of getxpid, getxuid, and getxgid syscalls on alpha.
164 * Enhanced decoding of pipe syscall on alpha, ia64, mips, sh, and sparc.
165 * Added decoding of bind, listen, and setsockopt direct syscalls on sparc.
166 * Added decoding of osf_statfs64 and osf_fstatfs64 syscalls on alpha.
167 * Added decoding of fadvise64 and fadvise64_64 on s390.
168 * Updated lists of AF_*, BPF_MAP_TYPE_*, CLONE_*, EPOLL*, IPV6_*, MADV_*,
169 MSG_*, PTRACE_*, SEGV_*, SO_*, SOL_*, *_MAGIC, and quotactl constants.
170 * Updated lists of ioctl commands from Linux 4.6.
173 * Fixed build on arc, metag, nios2, or1k, and tile architectures.
174 * Fixed decoding of 32-bit times syscall return value on 64-bit architectures.
175 * Fixed decoding of mlock2 syscall on sparc.
176 * Fixed decoding of osf_shmat syscall on alpha.
177 * Fixed decoding of syscalls unknown to the kernel on s390/s390x.
178 (addresses Debian bug #485979 and Fedora bug #1298294).
179 * Fixed decoding of preadv syscall in case of short read.
180 * Fixed decoding and dumping of readv syscall in case of short read.
181 * Fixed dumping of recvmsg and recvmmsg syscalls in case of short read.
182 * Fixed decoding of mincore syscall's last argument.
183 * Fixed remaining errors in mapping between syscall numbers and numbers
184 of syscall arguments.
185 * Applied various fixes to strace-graph script.
187 Noteworthy changes in release 4.11 (2015-12-21)
188 ===============================================
190 * Changes in behavior
191 * Some syscalls have different names depending on architecture and
192 personality. In these cases, syscall filtering and printing now
193 consistently uses the names that match corresponding __NR_* kernel
194 macros of the tracee's architecture and personality.
195 * Added strace prefix to all diagnostic messages.
198 * Enhanced and extended test suite.
199 * Implemented reliable tracing of processes whose personality differs
200 from the personality of strace, fixed decoding of 32-bit personality
201 syscalls on 64-bit architectures.
202 * When some data referenced by syscall arguments is irrelevant or cannot
203 be read from tracee's memory, strace now prints its address consistently.
204 * When a syscall is restarted using restart_syscall mechanism, strace now
205 shows the syscall name on architectures that expose this information.
206 * Print values returned by epoll_create1, eventfd, eventfd2, fanotify_init,
207 inotify_init1, perf_event_open, pipe, pipe2, signalfd, signalfd4, socket,
208 socketpair, timerfd, and timerfd_create syscalls, as well as F_DUPFD and
209 F_DUPFD_CLOEXEC fcntl commands, as file descriptors.
210 * Optimized decoding of indirect socket syscalls.
211 * Implemented decoding of nanoseconds along with seconds in stat family
212 syscalls (addresses Fedora bug #1251176).
213 * Implemented decoding of struct statfs.f_flags in statfs syscall.
214 * Implemented decoding of siginfo_t.si_syscall and siginfo_t.si_arch
216 * Implemented decoding of indirect syscall on mips o32.
217 * Implemented decoding of IPPROTO_IP control messages.
218 * Implemented decoding of setsockopt syscall multicast arguments.
219 * Enhanced decoding of struct sigevent.
220 * Enhanced decoding of block, loop, mtd, ptp, rtc, SG_IO, socket, tty,
221 and v4l2 ioctl syscall arguments.
222 * Enhanced decoding of epoll_create, fcntl, fcntl64, futex, getdents,
223 getdents64, getsockopt, io_*, mount, msgctl, prctl, quotactl, recvfrom,
224 sendfile, setsockopt, and shmctl syscalls.
225 * Implemented decoding of bpf, execveat, ioperm, iopl, kcmp, kexec_file_load,
226 lookup_dcookie, membarrier, memfd_create, mlock2, name_to_handle_at,
227 open_by_handle_at, sched_getattr, sched_setattr, and userfaultfd syscalls.
228 * Updated lists of AF_*, EPOLL_*, FALLOC_FL_*, F_*, INPUT_PROP_*, IPPROTO_*,
229 IPV6_*, IP_*, KEY_*, LOCK_*, MNT_*, MS_*, PACKET_*, PERF_FLAG_*, PF_*,
230 PR_*, PTRACE_O_*, RENAME_*, SCTP_*, SECBIT_*, SO_*, TCP_*, and siginfo_t
232 * Added Nios II architecture support.
233 * Added new syscall entries to match Linux 4.4.
236 * Fixed potential short read of strings from tracee's memory.
237 * Fixed -qq option in conjunction with -o option.
238 * Fixed filtering of <unavailable> syscalls.
239 * Fixed decoding of ioctl syscall command on aarch64 and 32-bit architectures
240 with 64-bit aligned structures.
241 * Fixed decoding of eventfd2, epoll_create1, signalfd4, and sync_file_range2
242 syscall flags arguments.
243 * Fixed decoding of 4th argument of clock_nanosleep syscall.
244 * Fixed decoding of getpagesize syscall on m68k.
245 * Fixed decoding of getrandom and seccomp syscalls on aarch64.
246 * Fixed decoding of timezone argument of gettimeofday and settimeofday
248 * Fixed decoding of offset argument of mmap2 syscall on arm, sparc,
250 * Fixed decoding of pipe syscall on alpha and mips.
251 * Fixed decoding of pipe2 syscall on ia64, sh, sparc, and sparc64.
252 * Fixed decoding of signal mask argument of pselect6 syscall on x32.
253 * Fixed decoding of signal mask of rt_sigreturn syscall on aarch64, m68k,
255 * Fixed decoding of 4th argument of semctl indirect syscall.
256 * Fixed decoding of sa_restorer and sa_mask of sigaction syscall on m68k.
257 * Fixed decoding of statfs64 and fstatfs64 syscalls on arm eabi.
258 * Fixed decoding of struct dirent on x32.
259 * Fixed decoding of times syscall return value on mips n32 and x32.
260 * Fixed decoding of path argument of umount2 syscall
261 (addresses Debian bug #785050).
262 * Worked around a kernel bug in tracing privileged executables.
263 * Fixed various errors in mapping between syscall numbers and associated
264 information like the number of syscall arguments, the name of syscall,
267 Noteworthy changes in release 4.10 (2015-03-06)
268 ===============================================
271 * Added -yy option to print protocol and address information associated with
273 * Extended "-e read=set" and "-e write=set" options to cover sendmsg,
274 recvmsg, sendmmsg, and recvmmsg syscalls.
275 * Implemented full 32-bit decoding of ioctl commands
276 (addresses Debian bug #692913 and Fedora bug #902788).
277 * Implemented PTRACE_GETREGS API support on ia64.
278 * Implemented PTRACE_GETREGS API support on mips.
279 * Implemented PTRACE_GETREGSET API support on s390/s390x.
280 * Implemented decoding of getrandom and seccomp syscalls.
281 * Implemented full decoding of 64-bit capability sets.
282 * Implemented decoding of all prctl commands.
283 * Implemented decoding of parametrized ioctl commands.
284 * Implemented decoding of evdev ioctl commands.
285 * Implemented decoding of v4l ioctl commands.
286 * Implemented decoding of SG_IO v4 ioctl commands.
287 * Implemented decoding of FIFREEZE/FITHAW/FITRIM ioctl commands.
288 * Implemented decoding of FALLOC_FL_* fallocate flags.
289 * Implemented decoding of rt_sigreturn signal mask on aarch64,
291 * Enhanced socket decoder to support bluetooth sockets.
292 * Enhanced decoding of unlisted ioctl commands.
293 * Enhanced decoding of getsockopt and setsockopt syscall.
294 * Enhanced decoding of sysinfo syscall.
295 * Enhanced decoding of struct cmsghdr.
296 * Enhanced decoding of wait status.
297 * Enhanced aio support on non-x86 architectures by using external libaio.h.
298 * Added O_TMPFILE to the list of recognized open mode flags.
299 * Updated the list of filesystem type constants that is used in decoding
300 statfs family syscalls.
301 * Updated lists of CAP_*, PR_*, PTRACE_*, SCHED_*, SO_*, SOL_*, SWAP_FLAG_*,
303 * Updated lists of signal constants from Linux 3.19.
304 * Updated lists of errno constants from Linux 3.19.
305 * Updated lists of ioctl commands from Linux 3.9.
306 * Added new syscall entries to match Linux 3.19.
309 * Fixed various errors in mapping between syscall numbers and associated
310 information like the number of syscall arguments, the name of syscall,
312 * Fixed quoting issues in printing descriptors, filenames, network interface
313 names, struct utsname members, device/volume names of BLK* ioctl commands.
314 * Fixed uid_t/git_t decoding.
315 * Fixed potential out-of-bounds read issues in getdents/getdents64 decoders.
316 * Fixed potential open flags truncation on some architectures.
317 * Fixed decoding of struct ifreq.ifr_name.
318 * Fixed decoding of SIOCSIFNAME ioctl command.
319 * Fixed decoding of RENAME_* renameat2 flags.
320 * Fixed decoding of UTIME_NOW/UTIME_OMIT timeval structures.
321 * Fixed decoding of indirect ipc subcalls on some architectures.
322 * Fixed decoding of fanotify_mark syscall on 32-bit architectures.
323 * Fixed decoding of 32-bit stat structures on 64-bit architectures.
324 * Fixed decoding of 32-bit struct cmsghdr on 64-bit architectures.
325 * Fixed decoding of 32-bit preadv/pwritev offset on 64-bit architectures.
326 * Fixed decoding of sigreturn/rt_sigreturn signal mask on ia64, ppc, ppc64,
327 sparc, sparc64, mips, and s390.
328 * Fixed instruction pointer output (-i option) on architectures that support
329 several personalities.
330 * Fixed behaviour of "-e read=set" and "-e write=set" when read and write
332 * Fixed build on systems where struct sigaction has no sa_restorer member.
333 * Fixed build with uclibc and musl libc.
336 * Linux kernel >= 2.5.46 is required.
337 Older versions without a decent PTRACE_SETOPTIONS support will not work.
338 * On mips, linux kernel >= 2.6.15 is required.
339 Older versions without a decent PTRACE_GETREGS support will not work.
340 * On s390 and s390x, linux kernel >= 2.6.27 is required.
341 Older versions without a decent PTRACE_GETREGSET support will not work.
343 Noteworthy changes in release 4.9 (2014-08-15)
344 ==============================================
346 * Changes in behavior
347 * Disabled OABI support on ARM EABI systems by default,
348 added --enable-arm-oabi option to enable it at configure time.
351 * Added experimental -k option to print stack trace after each traced syscall.
352 * Added -w option to produce stats on syscall latency.
353 (addresses Debian bug #457497).
354 * Added ARC architecture support.
355 * Added PTRACE_GETREGS API support on PowerPC.
356 * Enhanced Bionic libc and musl libc support.
357 * Enhanced tracing of x86 personality processes on x86_64 and x32.
358 * Enhanced tracing of ARM personality processes on AArch64.
359 * Enhanced 32/64bit personality detection on PowerPC.
360 * Implemented decoding of add_key, ioprio_get, ioprio_set, kexec_load, keyctl,
361 renameat2, and request_key syscalls.
362 * Robustified decoding of select, pselect, and io_submit syscalls.
363 * Enhanced decoding of delete_module, fanotify_init, fanotify_mark, fcntl,
364 setdomainname, sethostname, setns, and sync_file_range syscalls.
365 * Enhanced decoding of signal bitmasks.
366 * Enhanced decoding of file descriptors.
367 * Enhanced siginfo_t decoding.
368 * Enhanced PF_NETLINK decoding.
369 * Updated CLOCK_* constants
370 (addresses Fedora bug #1088455).
371 * Added new syscall entries to match Linux 3.16.
374 * Added shmat and shmdt to the set of memory mapping related syscalls.
375 * Fixed detaching from stopped processes.
376 * Fixed fanotify_mark decoding on 32bit architectures.
377 * Fixed offset decoding in preadv and pwritev syscalls.
378 * Fixed select decoding for glibc in _FORTIFY_SOURCE mode.
379 * Fixed decoding of epoll_ctl syscall with EPOLL_CTL_DEL argument.
380 * Fixed build when <sys/ptrace.h> and <linux/ptrace.h> conflict
381 (addresses Fedora bug #993384).
382 * Miscellaneous corrections in the manual page.
383 (Addresses Debian bug #725987).
385 Noteworthy changes in release 4.8 (2013-06-03)
386 ==============================================
388 * Changes in behavior
389 * In case of normal strace termination, when the trace output is
390 redirected to a pipe, strace now closes it and waits for the pipe
391 process termination before exit.
394 * Implemented tracing using PTRACE_SEIZE API (when available).
395 * Implemented more reliable PTRACE_GETREGSET-based process personality
396 detection on x86-64 and x32 (when available).
397 * Added -e trace=memory option for tracing memory mapping related syscalls.
398 * Documented -b option.
399 * Allowed exit status messages to be suppressed by giving -q option twice.
400 * Added AArch64 architecture support
401 (addresses Debian bug #693074 and Fedora bug #969858).
402 * Added support for OpenRISC 1000, Meta, and Xtensa architectures.
403 * Added tilegx personality support for Tile.
404 * Enhanced support of NOMMU architectures.
405 * Enhanced decoding of getdents, mmap, perf_event_open, ptrace, and
407 * Added new syscall entries to match Linux 3.9.
408 * Regenerated the list of common ioctl names from Linux 3.9.
409 * Updated the list of errno constants.
410 * Updated lists of AF_*, MADV_*, MAP_*, MSG_*, MS_*, PF_*, PR_*,
411 PTRACE_O_*, and TCP_* constants.
412 * Implemented decoding of UBI ioctls.
413 * Removed redundant "*32" ioctl names.
416 * Fixed ERESTARTNOINTR leaking to userspace on ancient kernels
417 (addresses Fedora bug #659382).
418 * Fixed kernel release string parsing
419 (addresses Debian bug #702309).
420 * Fixed decoding of *xattr syscalls
421 (addresses Fedora bug #885233).
422 * Fixed handling of files with 64-bit inode numbers by 32-bit strace
423 (addresses Fedora bug #912790).
424 * Fixed tracing forks on SPARC.
425 * Fixed decoding of fadvise64, fallocate, ftruncate64, io_submit, pread,
426 preadv, pwrite, pwritev, readahead, sigaltstack, sync_file_range, sysctl,
427 and truncate64 syscalls.
428 * Fixed categories of multiple syscalls on most of supported architectures.
429 * Fixed decoding of non-native 32-bit personality recv[m]msg syscalls.
430 * Fixed decoding of multiple 32-bit personality syscalls on x32.
431 * Fixed decoding of long long syscall arguments on ARM, MIPS/o32, PowerPC,
432 S390x, and Tile architectures.
433 * Fixed semtimedop decoding on S390x.
434 * Fixed sram_alloc decoding on Blackfin.
435 * Fixed build when process_vm_readv is a stab.
436 * Fixed build with older versions of libaio.h.
438 Noteworthy changes in release 4.7 (2012-05-02)
439 ==============================================
441 * Changes in behavior
442 * strace no longer suspends waitpid until there is a child
443 for waitpid'ing process to collect status from.
444 * strace no longer detaches from a tracee which is supposed
446 * strace now issues a new message: "+++ exited with EXITCODE +++"
447 which shows exact moment strace got exit notification,
448 analogous to existing "+++ killed by SIG +++" message.
451 * Added x32 personality support (x86_64 architecture).
452 * Added -y and -P options to print file descriptor paths and
453 filter by those paths.
454 * Added -I option to control strace interactivity.
455 * Allowed -p option to take comma or whitespace-separated list of PIDs.
456 * Added strace_log_merge script helper to merge timestamped "strace -ff"
458 * Implemented decoding of clock_adjtime, get_robust_list, migrate_pages,
459 preadv, prlimit64, process_vm_readv, process_vm_writev, pwritev,
460 recvmmsg, recvmsg, rt_tgsigqueueinfo, sendmmsg, setns, set_robust_list,
461 sched_rr_get_interval, splice, syslog, tee and vmsplice syscalls.
462 * Enhanced decoding of capget, capset, getrlimit, flistxattr, io_submit,
463 listxattr, setrlimit and swapon syscalls.
464 * Implemented decoding of loop and mtd ioctls.
465 * Added syscall entries for new linux syscalls.
466 * Added syscall entries for direct socket system calls on powerpc.
467 * Updated the list of errno constants.
468 * Updated lists of MSG_*, STA_*, and TCP_* constants.
469 * Regenerated the list of ioctl names from Linux 3.3.
470 * Enhanced switching between processes with different personalities.
471 * Enhanced signals reporting by using short signal names.
472 * Made ERESTART* messages more descriptive.
473 * Made parsing of numbers from strings more robust.
474 * Added support for compat_statfs64 and statfs64.f_flags.
475 * Changed read of data blocks to use single process_vm_readv syscall
476 (when available) instead of several PTRACE_PEEKDATA operations.
477 * Changed read of registers on x86 and x86-64 to use single PTRACE_GETREGS
478 operation instead of several PTRACE_PEEKUSER operations.
479 * Applied various optimizations to make strace work faster.
482 * Implemented proper handling of real SIGTRAPs on kernels supporting
483 PTRACE_O_TRACESYSGOOD.
484 (Addresses Fedora bug #162774).
485 * Fixed sockaddr_un.sun_path name in decoded output.
486 (Addresses Debian bug #554946).
487 * Fixed to avoid potential core file clobbering on exit.
488 (Addresses Debian bug #656398).
489 * Fixed a typo in documentation.
490 (Addresses Debian bug #653309).
491 * Fixed decoding of timer id returned by timer_create.
492 * Fixed epoll_create1, epoll_wait and epoll_pwait decoding.
493 * Fixed *at syscalls flags decoding.
494 * Fixed ARM EABI 64-bit syscall's arguments decoding.
495 * Fixed semtimedop decoding on s390.
496 * Fixed osf_sigprocmask decoding on alpha.
497 * Fixed ipc and socket subcall decoding on several architectures.
498 * Corrected syscall entries for epoll_pwait, epoll_create, epoll_ctl,
499 epoll_wait, mincore, mlockall, prctl, reboot, sendfile, sendfile64,
500 sendmsg, sgetmask, ssetmask, swapon, tgkill and tkill syscalls.
501 * Corrected io_* syscall entries on ARM.
502 * Fixed PID prefix printing in "strace -oLOG -ff -p1 -p2 -p3" case.
503 * Fixed logging of unfinished lines in "strace -oLOG -ff" case.
504 * Fixed build when libaio-devel is not available.
505 * Fixed configure checks for PTRACE_* constants.
506 * Fixed compilation warnings remained on several architectures.
509 * Removed all non-Linux code. After years of neglect, that dead code
510 just hampered further strace development.
511 * Linux kernel >= 2.6.18 is recommended. Older versions might still
512 work but they haven't been thoroughly tested with this release.
514 Noteworthy changes in release 4.6 (2011-03-15)
515 ==============================================
517 * Changes in behavior
518 * Print diagnostic information about changes in personality mode to
519 standard error instead of standard output.
522 * Implemented a new method of following clone, fork, and vfork
523 syscalls using the Linux kernel's explicit facilities for tracing
524 creation of threads and child processes.
525 * Implemented CLONE_PARENT and CLONE_UNTRACED flags handling.
526 * Implemented decoding of TLS syscalls on m68k.
527 * Implemented biarch support on powerpc64.
528 * Implemented biarch support for getrlimit() and setrlimit().
529 * Implemented decoding of struct ucred in getsockopt SO_PEERCRED.
530 * Implemented SOL_SCTP socket options decoding.
531 * Added HDIO_* ioctl names.
532 (Addresses Debian bug #450953).
533 * Added LOOP_* ioctl names.
534 * Updated lists of CLOCK_*, CLONE_*, MS_*, and SOL_* constants
535 to match Linux 2.6.37.
536 * Updated the list of IPPROTO_* constants to match netinet/in.h.
537 * Implemented decoding of HDIO_* and BLK* ioctls.
538 * Added MicroBlaze architecture support.
539 * Added new syscall entries to match Linux 2.6.37.
540 * Regenerated list of ioctl names from Linux 2.6.37.
541 * Enhanced signal notification decoding.
542 * Documented -C and -D options.
545 * Fixed fetching syscall arguments on m68k.
546 * Fixed an error when judging whether a process has children.
547 * Fixed get/set_robust_list syscall numbers for powerpc.
548 * Fixed a corner case in printing clone flags.
549 * Fixed cross-compiling issues.
550 * Fixed build issues on powerpc64, SH and SPARC.
551 * Fixed syscall flags of fstatat*, mmap, mmap2, fadvise64*, swapoff,
552 fgetxattr, flistxattr, fremovexattr, epoll_create, fallocate,
553 fanotify_init, and fanotify_mark syscalls.
554 * Fixed decoding of get[ug]id, gete[ug]id and setfs[ug]id return values.
555 * Fixed biarch support in IO dumping.
556 * Fixed raw exit_group decoding.
557 * Fixed decoding of file descriptors on 64-bit architectures.
558 * Fixed a corner case in waitpid handling.
559 (Addresses Red Hat bug #663547).
560 * Fixed stat64 decoding on mips
561 (Addresses Debian bug #599028).
562 * Fixed misleading italics in the manual page.
563 (Addresses Debian bug #589323).
565 Noteworthy changes in release 4.5.20 (2010-04-13)
566 =================================================
569 * Implemented decoding of new linux syscalls: inotify_init1, recvmmsg.
570 * Implemented basic decoding of new linux syscalls: preadv, pwritev,
571 rt_tgsigqueueinfo, perf_event_open.
572 * Enhanced decoding of recently added syscalls on non-x86 architectures
573 by replacing a bare decoder with elaborate parsers enabled earlier
575 * Implemented -C option to combine regular and -c output.
576 (Addresses Debian bug #466196)
577 * Enhanced decoding of mbind and mremap syscalls.
578 * Enhanced SOL_PACKET socket options decoding.
579 * Regenerated list of ioctl names from linux 2.6.33.
580 * Added TILE architecture support.
583 * Fixed build with Linux kernel headers 2.6.32-rc5+.
584 (Addresses Debian bug #560516 and Fedora bug #539044)
585 * Fixed build on mips.
586 * Fixed handling of Linux systems without struct statfs64.
587 * Fixed reporting signal mask by sigreturn on powerpc.
588 * Fixed potential stack buffer overflow in select decoder.
589 (Addresses Fedora bug #556678)
590 * Corrected msgsnd indirect ipccall decoding.
591 * Corrected decoding of 64bit syscalls.
592 (Addresses Debian bug #570603)
593 * Corrected getsockopt decoding on architectures where
594 sizeof(long) > sizeof(int).
595 (Addresses Debian bug #494844)
596 * Corrected decoding of epoll_pwait.
597 (Addresses Debian bug #513014)
598 * Corrected handling of killed threads.
600 Noteworthy changes in release 4.5.19 (2009-10-21)
601 =================================================
603 * Changes in behavior
604 * When command exits, strace now exits with the same exit status.
605 If command is terminated by a signal, strace terminates itself
606 with the same signal, so that strace can be used as a wrapper
607 process transparent to the invoking parent process.
608 When using -p option, the exit status of strace is zero unless
609 there was an unexpected error in doing the tracing.
610 (Addresses Fedora bug #105371 and Debian bug #37665)
613 * Implemented decoding of new Linux syscalls: accept4, dup3,
614 epoll_create1, eventfd2, inotify_init1, pipe2, signalfd4.
615 * Implemented decoding of socket type flags introduced in Linux 2.6.27.
616 * Implemented decoding of accept4 socketcall.
617 * Enhanced prctl decoding.
618 * Enhanced nanosleep decoding.
619 * Enhanced ptrace decoding.
620 * Enhanced futex decoding.
621 * Enhanced CAP_* decoding.
622 * Enhanced SIOCS* ioctls decoding.
623 * Enhanced fcntl F_* flags decoding.
624 * Enhanced semop/semtimedop decoding.
625 * Updated ARM architecture support.
626 * Added Blackfin architecture support.
627 * Added AVR32 architecture support.
628 * Added CRIS architecture support.
629 * Made strace detect when traced process suddenly disappeared.
632 * Fixed syscall numbers for tee and sync_file_range.
633 (Addresses Debian bug #503124)
634 * Fixed several bugs in strings decoder, including potential heap
636 (Addresses Fedora bugs #470529, #478324 and #511035)
637 * Marked sendfile(2) as a network syscall.
638 (Addresses Debian bug #509499)
639 * Fixed accept(2) decoding.
640 (Addresses Debian bug #507573)
641 * Fixed sigtimedwait(2) decoding.
642 * Fixed build on ARM EABI.
643 (Addresses Debian bugs #520084 and #535564, and Fedora bug #507576)
644 * Fixed display of 32-bit fcntl(F_SETLK) on 64-bit architectures.
645 (Addresses Red Hat bug #471169)
646 * Fixed display of 32-bit argv array on 64-bit architectures.
647 (Addresses Fedora bug #519480)
648 * Fixed display of 32-bit struct sigaction on 64-bit architectures.
649 * Fixed HPPA architecture support.
650 (Addresses Debian bugs #437928 and #546619)
655 * Support new Linux/PPC system call subpage_prot and PROT_SAO flag.
656 * In sigaction system call, display sa_flags value along with SIG_DFL/SIG_IGN.
661 * -F is now deprecated, -f has traced vfork too on Linux for a long time now.
662 * Print O_CLOEXEC, MSG_CMSG_CLOEXEC flag bits.
663 * Improved output for prctl system call on Linux.
664 * Improved support for Linux/ARM.
665 * SA_NOMASK is now spelled SA_NODEFER, and SA_ONESHOT is spelled SA_RESETHAND.
670 * Improved output for delete_module, futex, and mbind system calls on Linux.
671 * Improved output for SG_IO ioctls on Linux.
672 * Support new Linux system calls move_pages, utimensat, signalfd, timerfd,
673 eventfd, getcpu, epoll_pwait.
678 * Several biarch improvements.
679 * Improved output for adjtimex, sysctl, quotactl, mount, umount.
680 * Support new Linux system calls *at, inotify*, pselect6, ppoll and unshare.
685 * Accept numeric system calls in -e.
690 * Introduce "-e trace=desc".
695 * Better x86-64 support for IA32 processes.
696 * Update PowerPC system calls.
697 * Better printing for Linux aio system calls.
701 * Quick fix release for build issues.
702 * One fix for Linux/ARM system call table.
707 * Print fault address for SIGSEGV/SIGBUS signals when available.
712 * Improve socket ioctl printing.
713 * Update Linux/IA64 syscall list.
714 * Fix Linux/x86-64 syscall argument extraction for 32-bit processes.
715 * Improve mount flags printing.
716 * Support symbolic printing of x86_64 arch_prctl parameters.
721 * Update syscall tables for Alpha, ARM, HPPA.
722 * Support new Linux syscalls mbind, set_mempolicy, get_mempolicy, waitid.
723 * Support Linux syscalls fadvise64, fadvise64_64, and epoll_*.
724 * Improve ioctl command name matching.
725 * Print RTC_* ioctl structure contents.
726 * Support newer RLIMIT_* values.
727 * Print struct cmsghdr details in sendmsg.
732 * Print attribute values in *xattr system calls on Linux.
733 * Include pread and pwrite calls in -e read and -e write tracing.
734 * Update SO_* and IP_* value lists and add IPV6_* values for socket options.
735 * Print clock_t values symbolically in Linux clock_* system calls.
739 * Bug fixes, Linux ioctl updates.
740 * David Miller contributed support for Linux/SPARC64.
748 * Update Linux ioctl lists.
749 * Update PF_* and AF_* value lists.
750 * The 4.5.3 -p behavior for NPTL threads applies only under -f, and got fixed.
755 * On Linux using NPTL threads, -p will now attach to all threads in a process.
756 * Handle new mq_* system calls in Linux 2.6.6 and later.
761 * Report some new VM_* bit values on Linux.
762 * Better output for Linux sched_* system calls.
767 * Display multiple ioctl name matches on Linux.
771 * New port to AMD's x86-64 architecture. One strace binary can
772 handle both new x86-64 and old i386 processes.
773 * Fixed support for LFS64 calls.
774 * New switch -E to add/remove environment variables for the command.
775 * Merged s390/s390x port.
776 * Trace an unbounded number of processes.
777 * Handle numerous new system calls in Linux 2.5, and new threads semantics.
778 * Fixed bugs with attach/detach leaving things stopped.
779 * Fixed traced process seeing ECHILD despite live, traced children
780 in waitpid calls with WNOHANG.
781 * Stuart Menefy contributed a port to Linux/SH.
782 * Stephen Thomas contributed a port to Linux/SH64.
783 * Many other bug fixes.
787 * Fix Linux/ia64 support, looks like someone renamed a few things on us
788 * Fix the ioctl setup for Linux, turned out it did not really work.
789 Improve the ioctl extracter as well so we decode some more ones.
793 * compile fixes for Linux/mips
797 * Linux ia64 and hppa ports added
798 * The usual Linux syscall updates (includes 32bit uid/gid support),
799 * Linux ioctl list updated
800 * Support IPv6 scope ids
801 * FreeBSD/i386 port added
802 * UnixWare and Solaris updates
803 * Better support for tracing multithreaded processes in Linux
807 * Compiles on glibc2.0 systems again
808 * Linux/S390 port added
809 * The usual Linux syscall updates
810 * we can follow fork on arm now
814 * Linux/MIPS port added
815 * Lots of Linux updates again
816 * Improved IPv6 support
822 * Compiles on glibc2.0 systems again
826 * Get stat structure properly on Linux 64bit archs
827 * Personalities work again
828 * Compile correctly on SunOS again
834 * Linux (ultra)sparc fixes
841 * add support for more Linux architectures (powerpc, sparc, arm)
842 * support lots more Linux syscalls
843 * fix signal handling
844 * add IPX and IPIP support
845 * check stray syscall after execv
846 * fix hanging children
848 Changes in version 3.1
849 ======================
852 * Linux 68k is supported
853 * Linux alpha is supported
854 * configure is upgraded to autoconf 2.x
855 * using -f in combination with -e now works correctly
856 * output can be piped to a program
857 * tracing setuid programs works better
858 * it is now reasonable to install strace setuid to root in some circumstances
859 * new useful tracing names like file and process to trace whole
860 classes of system calls, e.g. -efile traces all system calls that
861 take a file name as an argument
862 * IPC calls on SunOS 4.1.x are decoded
863 * Linux program memory is reliably dereferenced
864 * Linux decodes at least the name of all syscalls as of pre2.0.4
865 * various cosmetic changes and bug fixes
867 Changes from versions 2.x to version 3.0
868 ========================================
870 * filename arguments are neither abbreviated nor stringified
871 * string arguments are now true C strings using octal instead of hex by default
872 * preprocessor constants are never shortened (e.g. was RDONLY => now O_RDONLY)
873 * by default the output for multiple processes now goes into one file
874 * all structures, vectors, bitsets, etc. use consistent output formats
875 * the -c option now means count calls, -i does what the old -c used to do
877 New Features in version 3.0
878 ===========================
880 * non-ascii strings can be optionally printed entirely in hex
881 * the output format is readable when mutiple processes are generating output
882 * exit values are printed in an alignment column
883 * is is possible to suppress messages about attaching and detaching
884 * various tracing features can be enabled on a per syscall/signal/desc basis
885 * selective tracing of syscalls
886 * selective printing of syscall structures
887 * selective abbreviation of long structures on a per syscall basis
888 * selective printing of raw syscall arguments and results
889 * selective tracing of signals
890 * selective dumping of all I/O read from file descriptors
891 * selective dumping of all I/O written to file descriptors
892 * optional counting of time, calls, and errors for each syscall
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