1 Noteworthy changes in release ?.?? (????-??-??)
2 ===============================================
5 * Implemented decoding of netlink descriptor attributes as file descriptors.
6 * Implemented decoding of hugetlb page size selection flags.
7 * Implemented decoding of BPF_PROG_TEST_RUN, BPF_PROG_GET_NEXT_ID,
8 BPF_MAP_GET_NEXT_ID, BPF_PROG_GET_FD_BY_ID, BPF_MAP_GET_FD_BY_ID,
9 and BPF_OBJ_GET_INFO_BY_FD commands of bpf syscall.
10 * Enhanced decoding of getsockopt and setsockopt syscalls for SOL_NETLINK
12 * Enhanced decoding of BPF_MAP_CREATE command of bpf syscall.
13 * Print values returned by mq_open syscall and first arguments
14 of mq_getsetattr, mq_notify, mq_timedreceive, and mq_timedsend syscalls
16 * Updated lists of MSG_*, NT_*, and SHM_* constants.
17 * Added manual page for the strace-log-merge command.
18 * Updated lists of ioctl commands from Linux 4.15.
21 * Fixed multi-personality support in cross builds.
22 * Added mq_getsetattr, mq_notify, mq_open, mq_timedreceive, and mq_timedsend
23 syscalls to %desc tracing set.
26 * A C compiler that can compile ISO Standard C (currently C99) is required.
27 Older versions without support of "for" loop initial declarations
30 Noteworthy changes in release 4.20 (2017-11-13)
31 ===============================================
34 * Implemented decoding of NETLINK_NETFILTER netlink message types and flags.
35 * Implemented decoding of SECCOMP_GET_ACTION_AVAIL operation of seccomp
37 * Updated lists of ARPHRD_*, BPF_*, ETH_P_*, LOOP_*, MADV_*,
38 MEMBARRIER_CMD_*, MFD_*, SECCOMP_*, SO_*, SOL_*, TCP_*, and UFFD_FEATURE_*
40 * Added decoding of statx syscall on hppa.
41 * Updated lists of ioctl commands from Linux 4.14.
44 * Fixed powerpc personality support on powerpc64.
46 Noteworthy changes in release 4.19 (2017-09-05)
47 ===============================================
49 * Changes in behaviour
50 * Changed formatting of personality names on tile architecture in order
51 to make it in line with other multi-personality architectures.
52 * Changed field output order in struct v4l2_requestbuffers to improve in/out
54 * Changed handling of multiple signal= specifications in an injection
55 expression: multiple specification now leads to error instead of implicit
56 usage the last specification.
59 * Enhanced decoding of optlen argument of getsockopt syscall.
60 * Enhanced decoding of SO_LINGER option of getsockopt and setsockopt syscalls.
61 * Enhanced decoding of SO_PEERCRED option of getsockopt syscall.
62 * Enhanced decoding of IP_ADD_MEMBERSHIP, IP_DROP_MEMBERSHIP,
63 IPV6_ADD_MEMBERSHIP, IPV6_DROP_MEMBERSHIP, IPV6_JOIN_ANYCAST,
64 IPV6_LEAVE_ANYCAST, MCAST_JOIN_GROUP, and MCAST_LEAVE_GROUP options
65 of setsockopt syscall.
66 * Enhanced decoding of KEYCTL_DH_COMPUTE operation of keyctl syscall
67 (KDF parameters decoding).
68 * Implemented decoding of KEYCTL_RESTRICT_KEYRING operation of keyctl syscall.
69 * Enhanced decoding of UFFDIO_API ioctl command.
70 * Enhanced decoding of BPF_PROG_LOAD, BPF_MAP_CREATE, BPF_MAP_LOOKUP_ELEM,
71 and BPF_MAP_GET_NEXT_KEY commands of bpf syscall.
72 * Implemented decoding of linux socket filter programs specified
73 for SO_ATTACH_FILTER and SO_ATTACH_REUSEPORT_CBPF socket options.
74 * Implemented decoding of inet_diag_req_v2, inet_diag_req_compat,
75 packet_diag_msg, and smc_diag_msg netlink attributes of NETLINK_SOCK_DIAG.
76 * Implemented NETLINK_SELINUX protocol specific decoding.
77 * Implemented decoding of netlink message ack flags.
78 * Implemented decoding of nlmsgerr netlink attributes.
79 * Implemented basic protocol specific decoding of NETLINK_CRYPTO.
80 * Implemented decoding of crypto_user_alg netlink attributes
82 * Implemented basic protocol specific decoding of addr, addrlabel, dcb, link,
83 mdb, neigh, neightbl, netconf, nsid, route, rule, tc, and tca messages
85 * Implemented decoding of NETLINK_KOBJECT_UEVENT messages.
86 * Improved handling of unexpected tracees (the ones that cloned with
87 CLONE_PARENT/CLONE_PTRACE or called PTRACE_TRACEME on themselves): they
88 are now PTRACE_DETACH'ed instead of PTRACE_CONT'ed.
89 * Updated lists of BPF_*, KEY_*, RWF_*, SCM_*, SO_*, and *_MAGIC constants.
90 * Added decoding of arch_prctl syscall on x86.
91 * Added decoding of seccomp, bpf, userfaultfd, membarrier, mlock2,
92 copy_file_range, preadv2, pwritev2, and statx on alpha.
93 * Added decoding of statx syscall on microblaze.
94 * Added decoding of s390_guarded_storage syscall on s390.
95 * Updated lists of ioctl commands from Linux 4.13.
96 * Enhanced manual page.
99 * Fixed printing of group_req structure on non-native personalities.
100 * Fixed output formatting of blkpg_ioctl_arg, dm_name_list, and iocb
102 * Fixed formatting of nul-terminated strings which have kernel-imposed size
104 * Fixed printing of paths that hit PATM_MAX limit in order to match kernel's
106 * Fixed build warnings on Android mips64.
107 * Fixed unused function "is_negated_errno" build warning when built
109 * Fixed syscall number and arguments retrieval behaviour on sparc64 and
110 mips o32 after prctl(PR_SET_DUMPABLE, 0) makes PTRACE_PEEKTEXT impossible
111 to use if Linux kernel has commit v4.10-rc1~114^2~2.
112 * Fixed path tracing for execveat, symlink, symlinkat, inotify_add_watch,
113 and inotify_init syscalls.
114 * Fixed personality switch printing on sparc64 and risc-v.
116 Noteworthy changes in release 4.18 (2017-07-05)
117 ===============================================
120 * Implemented decoding of SCM_TIMESTAMP* control messages.
121 * Implemented decoding of netlink NLMSG_DONE messages.
122 * Implemented decoding of netlink generic nlmsg_type and nlmsg_flags.
123 * Implemented decoding of NETLINK_AUDIT, NETLINK_NETFILTER, NETLINK_ROUTE,
124 NETLINK_SELINUX, NETLINK_SOCK_DIAG, and NETLINK_XFRM message types.
125 * Implemented decoding of NETLINK_GENERIC protocol families.
126 * Implemented basic protocol specific decoding of AF_INET, AF_INET6,
127 AF_NETLINK, AF_PACKET, AF_SMC, and AF_UNIX messages of NETLINK_SOCK_DIAG.
128 * Implemented basic decoding of netlink attributes.
129 * Implemented basic protocol specific decoding of AF_INET, AF_NETLINK,
130 AF_PACKET, AF_SMC, and AF_UNIX netlink attributes of NETLINK_SOCK_DIAG.
131 * Implemented decoding of inet_diag_msg, netlink_diag_msg, and unix_diag_msg
132 netlink attributes of NETLINK_SOCK_DIAG.
133 * Updated lists of ARPHRD_*, KEYCTL_*, NDIAG_SHOW_*, RTM_*, SCM_*, SCTP_*,
134 SO_*, V4L2_*, and prctl ARCH_* constants.
135 * Updated lists of ioctl commands from Linux 4.12.
138 * In interactive mode (-I2), those signals that were blocked at startup
139 will remain blocked for the whole period of strace execution.
140 * strace no longer resets SIGCHLD handler in tracees to the default action.
141 * When traced command is terminated by a blocked signal, strace unblocks
142 that signal to ensure its own termination with the same signal.
143 * Fixed corner cases in decoding of old sigaction syscall.
144 * Fixed build with old kernel headers on mips.
145 * Fixed build on aarch64 and tile with glibc >= 2.26.
146 * Fixed build on arc and nios2.
148 Noteworthy changes in release 4.17 (2017-05-24)
149 ===============================================
151 * Changes in command line syntax
152 * Syscall classes specified in -e trace= option now have % prefix (like
153 -e trace=%process). Old style class names without leading % are still
154 supported, but considered deprecated now.
157 * Optimized syscall filtering.
158 * Improved representation of timestamps.
159 * Enhanced decoding of sched_setattr syscall.
160 * Added -e trace=%stat option for tracing variants of stat syscall.
161 * Added -e trace=%lstat option for tracing variants of lstat syscall.
162 * Added -e trace=%fstat option for tracing variants of fstat and fstatat
164 * Added -e trace=%%stat option for tracing syscalls used for querying file
165 status information (stat, lstat, fstat, fstatat, statx, and their
167 * Added -e trace=%statfs option for tracing statfs, statfs64 and statvfs
169 * Added -e trace=%fstatfs option for tracing fstatfs, fstatfs64 and fstatvfs
171 * Added -e trace=%%statfs option for tracing syscalls used for querying file
172 system statistics information (statfs-like, fstatfs-like and ustat).
173 * Added -e trace=/regex option for filtering syscalls using regular
175 * Added support for prepending of question mark before syscall qualification
176 in -e trace expressions in order to suppress error in case no syscalls
177 matched the provided qualification.
178 * Implemented decoding of signal mask in rt_sigreturn syscall on alpha, arc,
179 arm, avr32, bfin, cris, hppa, m68k, metag, microblaze, mips, nios2, or1k,
180 powerpc, powerpc64, riscv, sh, sh64, sparc, sparc64, tile, x86, and xtensa
182 * Implemented decoding of statx syscall.
183 * Implemented decoding of NS_* ioctl commands.
184 * Implemented decoding of the remaining V4L2_BUF_TYPE_* types.
185 * Implemented decoding of VIDIOC_[SG]_TUNER ioctl commands.
186 * Implemented decoding of NLMSG_ERROR netlink messages.
187 * Improved decoding of BPF_PROG_ATTACH command of bpf syscall.
188 * Improved decoding of misplaced parts in DM_* ioctl commands.
189 * Updated lists of ioctl commands from Linux 4.11.
192 * Fixed decoding of flags argument of preadv2 and pwritev2 syscalls on x32.
193 * Fixed the number of arguments and tracing flags of alpha specific syscalls.
194 * Fixed decoding of old sigsuspend syscall on alpha, cris, mips, powerpc,
195 powerpc64, sh, sh64, sparc, and sparc64.
196 * Fixed decoding of sgetmask and ssetmask syscalls on 64-bit architectures.
197 * Fixed decoding of netlink messages received within struct msghdr.
198 * Worked around a bug in miscompiled aarch64 kernels leading to the 3rd
199 argument of sched_getattr syscall being not quite 32-bit.
200 * Fixed corner cases of printing inaccessible times argument of utimes
201 and futimesat syscalls.
203 Noteworthy changes in release 4.16 (2017-02-14)
204 ===============================================
207 * Implemented syscall return value injection (-e inject=SET:retval= option).
208 * Implemented signal injection (-e inject=SET:signal= option).
209 * Implemented decoding of SUID_DUMP_* constants in PR_[GS]ET_DUMPABLE.
210 * Implemented decoding of all SG_* ioctl commands.
211 * Implemented decoding of ustat syscall.
212 * Implemented decoding of BPF_OBJ_PIN, BPF_OBJ_GET, BPF_PROG_ATTACH,
213 and BPF_PROG_DETACH commands of bpf syscall.
214 * Enhanced decoding of sg_io_hdr and sg_io_v4 structures.
215 * Enhanced decoding of get_robust_list, getrandom, io_submit, set_robust_list
217 * Enhanced decoding of entities of kernel long type on x32 and mips n32 ABIs.
218 * Updated lists of IP_*, IPV6_*, and LOOP_* constants.
219 * Updated lists of ioctl commands from Linux 4.10.
220 * Added decoding of recently added syscalls on avr32, microblaze, ppc,
224 * Fixed pathmatch of oldselect syscall on 64-bit architectures.
225 * Fixed decoding of mmap2 syscall on s390 when arguments are not available.
226 * Fixed decoding of kexec_file_load, mprotect, pkey_mprotect, prctl, preadv*,
227 and pwritev* syscalls on x32.
228 * Fixed printing of string arguments of getxattr and setxattr syscalls
229 when -s option is used to limit the printed string size.
230 * Fixed decoding of ifconf, ifreq, and loop_info structures on non-native
232 * Fixed decoding of SG_* and LOOP_* ioctl commands.
233 * Fixed build on mips with musl libc.
234 * Fixed cross-building of ioctlsort.
235 * Applied minor formatting fixes to the manual page.
237 Noteworthy changes in release 4.15 (2016-12-14)
238 ===============================================
240 * Changes in behavior
241 * Time stamps are now printed according to ISO 8601.
242 * Changed output format of val3 parameter of futex FUTEX_WAKE_OP operation.
243 * The last argument of mincore, sched_getaffinity, and sched_setaffinity
244 syscalls is now formatted as an array.
247 * Implemented syscall fault injection (-e fault=... option).
248 * Implemented decoding of DM_* ioctl commands.
249 * Implemented decoding of attr parameter of perf_event_open syscall.
250 * Implemented decoding of pkey_alloc, pkey_free, and pkey_mprotect syscalls.
251 * Implemented dumping of mq_timedsend and mq_timedreceive syscalls.
252 * Implemented decoding of PR_SET_FP_MODE and PR_GET_FP_MODE operations
254 * Implemented PTRACE_GETREGS API support on m68k.
255 * Updated lists of ARCH_*, BPF_*, BTRFS_*, FALLOC_*, MS_*, *_MAGIC,
256 and V4L2_* constants.
257 * Updated lists of ioctl commands from Linux 4.9.
258 * Added decoding of recently added syscalls on arc, x32, and xtensa.
259 * Enhanced manual page.
262 * Fixed corner cases in decoding of exit, exit_group, futimesat, getgroups,
263 getresuid, init_module, inotify_init1, kcmp, kexec_load, lookup_dcookie,
264 mq_getsetattr, mq_notify, mq_open, mq_timedreceive, mq_timedsend,
265 name_to_handle_at, prctl, process_vm_readv, process_vm_writev, setfsuid,
266 setgroups, setns, unshare, and utimes syscalls.
267 * Fixed handling of verbose flag in printing of controls array
268 of struct v4l2_ext_controls.
269 * Fixed omission of field names in the output of capability, sigaction,
270 sigevent, statfs, timespec, timeval, and utimbuf structures.
271 * Fixed printing of unknown syscalls in siginfo structure.
272 * Fixed decoding of ioctl constants on m68k.
273 * Fixed cris architecture support.
274 * Fixed cross build when host compiler does not support the same
275 set of warning flags as the cross compiler.
276 * Fixed build on SLE10 and SLE11.
278 Noteworthy changes in release 4.14 (2016-10-04)
279 ===============================================
281 * Changes in behavior
282 * When using -p option without a command and no processes has been attached,
283 strace exits with exit status 1.
286 * Added printing of the mode argument of open and openat syscalls
287 when O_TMPFILE flag is set. (Addresses Fedora bug #1377846).
288 * Enhanced -e abbrev=set, -e raw=set, and -e verbose=set.
289 * Enhanced decoding of futex, keyctl, quotactl, timerfd_settime,
290 and aio family syscalls.
291 * Implemented fetching of the 7th subcall argument on mips o32.
292 * Updated lists of BPF_*, ETH_P_*, KEXEC_ARCH_*, SCTP_*, TCP_*, and *_MAGIC
294 * Updated lists of ioctl commands from Linux 4.8.
295 * Added decoding of new syscalls on sh and sh64.
296 * Added RISC-V architecture support.
299 * Marked io_setup and io_destroy as memory mapping related syscalls.
300 * Fixed leakage of placeholder descriptors to tracees.
301 * Fixed printing of mode_t, umode_t, and umask types.
302 * Fixed decoding of iovec arrays without a limit on total data size.
303 * Fixed decoding of fadvise64, fallocate, futex, keyctl, quotactl, readahead,
304 and ipc family syscalls.
305 * Fixed decoding of invalid syscalls mapped to indirect subcalls.
306 * Fixed decoding of struct btrfs_ioctl_vol_args_v2 on non-native
308 * Fixed decoding of PTRACE_DETACH on sparc and sparc64.
309 * Fixed decoding of struct stat64 on sparc64.
310 * Fixed decoding of uid and gid-related syscalls on sparc64.
311 * Fixed decoding of the forth argument of semctl syscall on sparc64.
312 * Fixed values of tty ioctl constants on sparc64.
313 * Fixed sparc personality support on sparc64.
315 Noteworthy changes in release 4.13 (2016-07-26)
316 ===============================================
319 * Implemented a general netlink socket parser.
320 * Enhanced decoding of socket addresses.
321 * Enhanced decoding of cmsghdr, msghdr, and mmsghdr structures.
322 * Enhanced decoding of accept, accept4, bind, getpeername, getsockname,
323 ipc, recvfrom, recvmsg, recvmmsg, sendto, sendmmsg, and socketcall syscalls.
324 * Updated lists of AF_*, BPF_MAP_TYPE_*, KEY_*, KEYCTL_*, RWF_*, SS_*,
325 and *_MAGIC constants.
326 * Updated lists of ioctl commands from Linux 4.7.
329 * Fixed decoding of pid_t argument of prlimit64 syscall.
330 * Fixed sign extension issues in the parser of struct rusage.
331 * Fixed race condition in decoding of timeout argument of recvmmsg and
332 rt_sigtimedwait syscalls.
333 * Fixed build with fresh linux kernel headers.
335 Noteworthy changes in release 4.12 (2016-05-31)
336 ===============================================
339 * Implemented simultaneous use of -p option and tracing of a command.
340 (addresses Debian bug #549942).
341 * Implemented caching of netlink conversations to reduce amount of time
342 spent in decoding socket details in -yy mode.
343 * Implemented -yy mode decoding of protocol:portid pairs associated with
344 netlink socket descriptors.
345 * Implemented decoding of copy_file_range, preadv2, and pwritev2 syscalls.
346 * Implemented dumping of preadv, preadv2, pwritev, pwritev2, and vmsplice
348 * Implemented decoding of BTRFS_* and UFFDIO_* ioctl commands.
349 * Enhanced decoding of BLK*, EVIOC*, RTC_*, and VIDIOC_* ioctl commands.
350 * Enhanced decoding of fstatfs, fstatfs64, get_mempolicy, getdents,
351 getdents64, getgroups, getpriority, kill, mbind, migrate_pages, mknod,
352 mknodat, personality, poll, ppoll, quotactl, rt_sigpending,
353 rt_sigqueueinfo, rt_sigtimedwait, rt_tgsigqueueinfo, sched_getaffinity,
354 sched_setaffinity, seccomp, set_mempolicy, setgroups, setpriority, statfs,
355 statfs64, tgkill, waitid, and xattr family syscalls.
356 * Enhanced decoding of getxpid, getxuid, and getxgid syscalls on alpha.
357 * Enhanced decoding of pipe syscall on alpha, ia64, mips, sh, and sparc.
358 * Added decoding of bind, listen, and setsockopt direct syscalls on sparc.
359 * Added decoding of osf_statfs64 and osf_fstatfs64 syscalls on alpha.
360 * Added decoding of fadvise64 and fadvise64_64 on s390.
361 * Updated lists of AF_*, BPF_MAP_TYPE_*, CLONE_*, EPOLL*, IPV6_*, MADV_*,
362 MSG_*, PTRACE_*, SEGV_*, SO_*, SOL_*, *_MAGIC, and quotactl constants.
363 * Updated lists of ioctl commands from Linux 4.6.
366 * Fixed build on arc, metag, nios2, or1k, and tile architectures.
367 * Fixed decoding of 32-bit times syscall return value on 64-bit architectures.
368 * Fixed decoding of mlock2 syscall on sparc.
369 * Fixed decoding of osf_shmat syscall on alpha.
370 * Fixed decoding of syscalls unknown to the kernel on s390/s390x.
371 (addresses Debian bug #485979 and Fedora bug #1298294).
372 * Fixed decoding of preadv syscall in case of short read.
373 * Fixed decoding and dumping of readv syscall in case of short read.
374 * Fixed dumping of recvmsg and recvmmsg syscalls in case of short read.
375 * Fixed decoding of mincore syscall's last argument.
376 * Fixed remaining errors in mapping between syscall numbers and numbers
377 of syscall arguments.
378 * Applied various fixes to strace-graph script.
380 Noteworthy changes in release 4.11 (2015-12-21)
381 ===============================================
383 * Changes in behavior
384 * Some syscalls have different names depending on architecture and
385 personality. In these cases, syscall filtering and printing now
386 consistently uses the names that match corresponding __NR_* kernel
387 macros of the tracee's architecture and personality.
388 * Added strace prefix to all diagnostic messages.
391 * Enhanced and extended test suite.
392 * Implemented reliable tracing of processes whose personality differs
393 from the personality of strace, fixed decoding of 32-bit personality
394 syscalls on 64-bit architectures.
395 * When some data referenced by syscall arguments is irrelevant or cannot
396 be read from tracee's memory, strace now prints its address consistently.
397 * When a syscall is restarted using restart_syscall mechanism, strace now
398 shows the syscall name on architectures that expose this information.
399 * Print values returned by epoll_create1, eventfd, eventfd2, fanotify_init,
400 inotify_init1, perf_event_open, pipe, pipe2, signalfd, signalfd4, socket,
401 socketpair, timerfd, and timerfd_create syscalls, as well as F_DUPFD and
402 F_DUPFD_CLOEXEC fcntl commands, as file descriptors.
403 * Optimized decoding of indirect socket syscalls.
404 * Implemented decoding of nanoseconds along with seconds in stat family
405 syscalls (addresses Fedora bug #1251176).
406 * Implemented decoding of struct statfs.f_flags in statfs syscall.
407 * Implemented decoding of siginfo_t.si_syscall and siginfo_t.si_arch
409 * Implemented decoding of indirect syscall on mips o32.
410 * Implemented decoding of IPPROTO_IP control messages.
411 * Implemented decoding of setsockopt syscall multicast arguments.
412 * Enhanced decoding of struct sigevent.
413 * Enhanced decoding of block, loop, mtd, ptp, rtc, SG_IO, socket, tty,
414 and v4l2 ioctl syscall arguments.
415 * Enhanced decoding of epoll_create, fcntl, fcntl64, futex, getdents,
416 getdents64, getsockopt, io_*, mount, msgctl, prctl, quotactl, recvfrom,
417 sendfile, setsockopt, and shmctl syscalls.
418 * Implemented decoding of bpf, execveat, ioperm, iopl, kcmp, kexec_file_load,
419 lookup_dcookie, membarrier, memfd_create, mlock2, name_to_handle_at,
420 open_by_handle_at, sched_getattr, sched_setattr, and userfaultfd syscalls.
421 * Updated lists of AF_*, EPOLL_*, FALLOC_FL_*, F_*, INPUT_PROP_*, IPPROTO_*,
422 IPV6_*, IP_*, KEY_*, LOCK_*, MNT_*, MS_*, PACKET_*, PERF_FLAG_*, PF_*,
423 PR_*, PTRACE_O_*, RENAME_*, SCTP_*, SECBIT_*, SO_*, TCP_*, and siginfo_t
425 * Added Nios II architecture support.
426 * Added new syscall entries to match Linux 4.4.
429 * Fixed potential short read of strings from tracee's memory.
430 * Fixed -qq option in conjunction with -o option.
431 * Fixed filtering of <unavailable> syscalls.
432 * Fixed decoding of ioctl syscall command on aarch64 and 32-bit architectures
433 with 64-bit aligned structures.
434 * Fixed decoding of eventfd2, epoll_create1, signalfd4, and sync_file_range2
435 syscall flags arguments.
436 * Fixed decoding of 4th argument of clock_nanosleep syscall.
437 * Fixed decoding of getpagesize syscall on m68k.
438 * Fixed decoding of getrandom and seccomp syscalls on aarch64.
439 * Fixed decoding of timezone argument of gettimeofday and settimeofday
441 * Fixed decoding of offset argument of mmap2 syscall on arm, sparc,
443 * Fixed decoding of pipe syscall on alpha and mips.
444 * Fixed decoding of pipe2 syscall on ia64, sh, sparc, and sparc64.
445 * Fixed decoding of signal mask argument of pselect6 syscall on x32.
446 * Fixed decoding of signal mask of rt_sigreturn syscall on aarch64, m68k,
448 * Fixed decoding of 4th argument of semctl indirect syscall.
449 * Fixed decoding of sa_restorer and sa_mask of sigaction syscall on m68k.
450 * Fixed decoding of statfs64 and fstatfs64 syscalls on arm eabi.
451 * Fixed decoding of struct dirent on x32.
452 * Fixed decoding of times syscall return value on mips n32 and x32.
453 * Fixed decoding of path argument of umount2 syscall
454 (addresses Debian bug #785050).
455 * Worked around a kernel bug in tracing privileged executables.
456 * Fixed various errors in mapping between syscall numbers and associated
457 information like the number of syscall arguments, the name of syscall,
460 Noteworthy changes in release 4.10 (2015-03-06)
461 ===============================================
464 * Added -yy option to print protocol and address information associated with
466 * Extended "-e read=set" and "-e write=set" options to cover sendmsg,
467 recvmsg, sendmmsg, and recvmmsg syscalls.
468 * Implemented full 32-bit decoding of ioctl commands
469 (addresses Debian bug #692913 and Fedora bug #902788).
470 * Implemented PTRACE_GETREGS API support on ia64.
471 * Implemented PTRACE_GETREGS API support on mips.
472 * Implemented PTRACE_GETREGSET API support on s390/s390x.
473 * Implemented decoding of getrandom and seccomp syscalls.
474 * Implemented full decoding of 64-bit capability sets.
475 * Implemented decoding of all prctl commands.
476 * Implemented decoding of parametrized ioctl commands.
477 * Implemented decoding of evdev ioctl commands.
478 * Implemented decoding of v4l ioctl commands.
479 * Implemented decoding of SG_IO v4 ioctl commands.
480 * Implemented decoding of FIFREEZE/FITHAW/FITRIM ioctl commands.
481 * Implemented decoding of FALLOC_FL_* fallocate flags.
482 * Implemented decoding of rt_sigreturn signal mask on aarch64,
484 * Enhanced socket decoder to support bluetooth sockets.
485 * Enhanced decoding of unlisted ioctl commands.
486 * Enhanced decoding of getsockopt and setsockopt syscall.
487 * Enhanced decoding of sysinfo syscall.
488 * Enhanced decoding of struct cmsghdr.
489 * Enhanced decoding of wait status.
490 * Enhanced aio support on non-x86 architectures by using external libaio.h.
491 * Added O_TMPFILE to the list of recognized open mode flags.
492 * Updated the list of filesystem type constants that is used in decoding
493 statfs family syscalls.
494 * Updated lists of CAP_*, PR_*, PTRACE_*, SCHED_*, SO_*, SOL_*, SWAP_FLAG_*,
496 * Updated lists of signal constants from Linux 3.19.
497 * Updated lists of errno constants from Linux 3.19.
498 * Updated lists of ioctl commands from Linux 3.9.
499 * Added new syscall entries to match Linux 3.19.
502 * Fixed various errors in mapping between syscall numbers and associated
503 information like the number of syscall arguments, the name of syscall,
505 * Fixed quoting issues in printing descriptors, filenames, network interface
506 names, struct utsname members, device/volume names of BLK* ioctl commands.
507 * Fixed uid_t/git_t decoding.
508 * Fixed potential out-of-bounds read issues in getdents/getdents64 decoders.
509 * Fixed potential open flags truncation on some architectures.
510 * Fixed decoding of struct ifreq.ifr_name.
511 * Fixed decoding of SIOCSIFNAME ioctl command.
512 * Fixed decoding of RENAME_* renameat2 flags.
513 * Fixed decoding of UTIME_NOW/UTIME_OMIT timeval structures.
514 * Fixed decoding of indirect ipc subcalls on some architectures.
515 * Fixed decoding of fanotify_mark syscall on 32-bit architectures.
516 * Fixed decoding of 32-bit stat structures on 64-bit architectures.
517 * Fixed decoding of 32-bit struct cmsghdr on 64-bit architectures.
518 * Fixed decoding of 32-bit preadv/pwritev offset on 64-bit architectures.
519 * Fixed decoding of sigreturn/rt_sigreturn signal mask on ia64, ppc, ppc64,
520 sparc, sparc64, mips, and s390.
521 * Fixed instruction pointer output (-i option) on architectures that support
522 several personalities.
523 * Fixed behaviour of "-e read=set" and "-e write=set" when read and write
525 * Fixed build on systems where struct sigaction has no sa_restorer member.
526 * Fixed build with uclibc and musl libc.
529 * Linux kernel >= 2.5.46 is required.
530 Older versions without a decent PTRACE_SETOPTIONS support will not work.
531 * On mips, linux kernel >= 2.6.15 is required.
532 Older versions without a decent PTRACE_GETREGS support will not work.
533 * On s390 and s390x, linux kernel >= 2.6.27 is required.
534 Older versions without a decent PTRACE_GETREGSET support will not work.
536 Noteworthy changes in release 4.9 (2014-08-15)
537 ==============================================
539 * Changes in behavior
540 * Disabled OABI support on ARM EABI systems by default,
541 added --enable-arm-oabi option to enable it at configure time.
544 * Added experimental -k option to print stack trace after each traced syscall.
545 * Added -w option to produce stats on syscall latency.
546 (addresses Debian bug #457497).
547 * Added ARC architecture support.
548 * Added PTRACE_GETREGS API support on PowerPC.
549 * Enhanced Bionic libc and musl libc support.
550 * Enhanced tracing of x86 personality processes on x86_64 and x32.
551 * Enhanced tracing of ARM personality processes on AArch64.
552 * Enhanced 32/64bit personality detection on PowerPC.
553 * Implemented decoding of add_key, ioprio_get, ioprio_set, kexec_load, keyctl,
554 renameat2, and request_key syscalls.
555 * Robustified decoding of select, pselect, and io_submit syscalls.
556 * Enhanced decoding of delete_module, fanotify_init, fanotify_mark, fcntl,
557 setdomainname, sethostname, setns, and sync_file_range syscalls.
558 * Enhanced decoding of signal bitmasks.
559 * Enhanced decoding of file descriptors.
560 * Enhanced siginfo_t decoding.
561 * Enhanced PF_NETLINK decoding.
562 * Updated CLOCK_* constants
563 (addresses Fedora bug #1088455).
564 * Added new syscall entries to match Linux 3.16.
567 * Added shmat and shmdt to the set of memory mapping related syscalls.
568 * Fixed detaching from stopped processes.
569 * Fixed fanotify_mark decoding on 32bit architectures.
570 * Fixed offset decoding in preadv and pwritev syscalls.
571 * Fixed select decoding for glibc in _FORTIFY_SOURCE mode.
572 * Fixed decoding of epoll_ctl syscall with EPOLL_CTL_DEL argument.
573 * Fixed build when <sys/ptrace.h> and <linux/ptrace.h> conflict
574 (addresses Fedora bug #993384).
575 * Miscellaneous corrections in the manual page.
576 (Addresses Debian bug #725987).
578 Noteworthy changes in release 4.8 (2013-06-03)
579 ==============================================
581 * Changes in behavior
582 * In case of normal strace termination, when the trace output is
583 redirected to a pipe, strace now closes it and waits for the pipe
584 process termination before exit.
587 * Implemented tracing using PTRACE_SEIZE API (when available).
588 * Implemented more reliable PTRACE_GETREGSET-based process personality
589 detection on x86-64 and x32 (when available).
590 * Added -e trace=memory option for tracing memory mapping related syscalls.
591 * Documented -b option.
592 * Allowed exit status messages to be suppressed by giving -q option twice.
593 * Added AArch64 architecture support
594 (addresses Debian bug #693074 and Fedora bug #969858).
595 * Added support for OpenRISC 1000, Meta, and Xtensa architectures.
596 * Added tilegx personality support for Tile.
597 * Enhanced support of NOMMU architectures.
598 * Enhanced decoding of getdents, mmap, perf_event_open, ptrace, and
600 * Added new syscall entries to match Linux 3.9.
601 * Regenerated the list of common ioctl names from Linux 3.9.
602 * Updated the list of errno constants.
603 * Updated lists of AF_*, MADV_*, MAP_*, MSG_*, MS_*, PF_*, PR_*,
604 PTRACE_O_*, and TCP_* constants.
605 * Implemented decoding of UBI ioctls.
606 * Removed redundant "*32" ioctl names.
609 * Fixed ERESTARTNOINTR leaking to userspace on ancient kernels
610 (addresses Fedora bug #659382).
611 * Fixed kernel release string parsing
612 (addresses Debian bug #702309).
613 * Fixed decoding of *xattr syscalls
614 (addresses Fedora bug #885233).
615 * Fixed handling of files with 64-bit inode numbers by 32-bit strace
616 (addresses Fedora bug #912790).
617 * Fixed tracing forks on SPARC.
618 * Fixed decoding of fadvise64, fallocate, ftruncate64, io_submit, pread,
619 preadv, pwrite, pwritev, readahead, sigaltstack, sync_file_range, sysctl,
620 and truncate64 syscalls.
621 * Fixed categories of multiple syscalls on most of supported architectures.
622 * Fixed decoding of non-native 32-bit personality recv[m]msg syscalls.
623 * Fixed decoding of multiple 32-bit personality syscalls on x32.
624 * Fixed decoding of long long syscall arguments on ARM, MIPS/o32, PowerPC,
625 S390x, and Tile architectures.
626 * Fixed semtimedop decoding on S390x.
627 * Fixed sram_alloc decoding on Blackfin.
628 * Fixed build when process_vm_readv is a stab.
629 * Fixed build with older versions of libaio.h.
631 Noteworthy changes in release 4.7 (2012-05-02)
632 ==============================================
634 * Changes in behavior
635 * strace no longer suspends waitpid until there is a child
636 for waitpid'ing process to collect status from.
637 * strace no longer detaches from a tracee which is supposed
639 * strace now issues a new message: "+++ exited with EXITCODE +++"
640 which shows exact moment strace got exit notification,
641 analogous to existing "+++ killed by SIG +++" message.
644 * Added x32 personality support (x86_64 architecture).
645 * Added -y and -P options to print file descriptor paths and
646 filter by those paths.
647 * Added -I option to control strace interactivity.
648 * Allowed -p option to take comma or whitespace-separated list of PIDs.
649 * Added strace_log_merge script helper to merge timestamped "strace -ff"
651 * Implemented decoding of clock_adjtime, get_robust_list, migrate_pages,
652 preadv, prlimit64, process_vm_readv, process_vm_writev, pwritev,
653 recvmmsg, recvmsg, rt_tgsigqueueinfo, sendmmsg, setns, set_robust_list,
654 sched_rr_get_interval, splice, syslog, tee and vmsplice syscalls.
655 * Enhanced decoding of capget, capset, getrlimit, flistxattr, io_submit,
656 listxattr, setrlimit and swapon syscalls.
657 * Implemented decoding of loop and mtd ioctls.
658 * Added syscall entries for new linux syscalls.
659 * Added syscall entries for direct socket system calls on powerpc.
660 * Updated the list of errno constants.
661 * Updated lists of MSG_*, STA_*, and TCP_* constants.
662 * Regenerated the list of ioctl names from Linux 3.3.
663 * Enhanced switching between processes with different personalities.
664 * Enhanced signals reporting by using short signal names.
665 * Made ERESTART* messages more descriptive.
666 * Made parsing of numbers from strings more robust.
667 * Added support for compat_statfs64 and statfs64.f_flags.
668 * Changed read of data blocks to use single process_vm_readv syscall
669 (when available) instead of several PTRACE_PEEKDATA operations.
670 * Changed read of registers on x86 and x86-64 to use single PTRACE_GETREGS
671 operation instead of several PTRACE_PEEKUSER operations.
672 * Applied various optimizations to make strace work faster.
675 * Implemented proper handling of real SIGTRAPs on kernels supporting
676 PTRACE_O_TRACESYSGOOD.
677 (Addresses Fedora bug #162774).
678 * Fixed sockaddr_un.sun_path name in decoded output.
679 (Addresses Debian bug #554946).
680 * Fixed to avoid potential core file clobbering on exit.
681 (Addresses Debian bug #656398).
682 * Fixed a typo in documentation.
683 (Addresses Debian bug #653309).
684 * Fixed decoding of timer id returned by timer_create.
685 * Fixed epoll_create1, epoll_wait and epoll_pwait decoding.
686 * Fixed *at syscalls flags decoding.
687 * Fixed ARM EABI 64-bit syscall's arguments decoding.
688 * Fixed semtimedop decoding on s390.
689 * Fixed osf_sigprocmask decoding on alpha.
690 * Fixed ipc and socket subcall decoding on several architectures.
691 * Corrected syscall entries for epoll_pwait, epoll_create, epoll_ctl,
692 epoll_wait, mincore, mlockall, prctl, reboot, sendfile, sendfile64,
693 sendmsg, sgetmask, ssetmask, swapon, tgkill and tkill syscalls.
694 * Corrected io_* syscall entries on ARM.
695 * Fixed PID prefix printing in "strace -oLOG -ff -p1 -p2 -p3" case.
696 * Fixed logging of unfinished lines in "strace -oLOG -ff" case.
697 * Fixed build when libaio-devel is not available.
698 * Fixed configure checks for PTRACE_* constants.
699 * Fixed compilation warnings remained on several architectures.
702 * Removed all non-Linux code. After years of neglect, that dead code
703 just hampered further strace development.
704 * Linux kernel >= 2.6.18 is recommended. Older versions might still
705 work but they haven't been thoroughly tested with this release.
707 Noteworthy changes in release 4.6 (2011-03-15)
708 ==============================================
710 * Changes in behavior
711 * Print diagnostic information about changes in personality mode to
712 standard error instead of standard output.
715 * Implemented a new method of following clone, fork, and vfork
716 syscalls using the Linux kernel's explicit facilities for tracing
717 creation of threads and child processes.
718 * Implemented CLONE_PARENT and CLONE_UNTRACED flags handling.
719 * Implemented decoding of TLS syscalls on m68k.
720 * Implemented biarch support on powerpc64.
721 * Implemented biarch support for getrlimit() and setrlimit().
722 * Implemented decoding of struct ucred in getsockopt SO_PEERCRED.
723 * Implemented SOL_SCTP socket options decoding.
724 * Added HDIO_* ioctl names.
725 (Addresses Debian bug #450953).
726 * Added LOOP_* ioctl names.
727 * Updated lists of CLOCK_*, CLONE_*, MS_*, and SOL_* constants
728 to match Linux 2.6.37.
729 * Updated the list of IPPROTO_* constants to match netinet/in.h.
730 * Implemented decoding of HDIO_* and BLK* ioctls.
731 * Added MicroBlaze architecture support.
732 * Added new syscall entries to match Linux 2.6.37.
733 * Regenerated list of ioctl names from Linux 2.6.37.
734 * Enhanced signal notification decoding.
735 * Documented -C and -D options.
738 * Fixed fetching syscall arguments on m68k.
739 * Fixed an error when judging whether a process has children.
740 * Fixed get/set_robust_list syscall numbers for powerpc.
741 * Fixed a corner case in printing clone flags.
742 * Fixed cross-compiling issues.
743 * Fixed build issues on powerpc64, SH and SPARC.
744 * Fixed syscall flags of fstatat*, mmap, mmap2, fadvise64*, swapoff,
745 fgetxattr, flistxattr, fremovexattr, epoll_create, fallocate,
746 fanotify_init, and fanotify_mark syscalls.
747 * Fixed decoding of get[ug]id, gete[ug]id and setfs[ug]id return values.
748 * Fixed biarch support in IO dumping.
749 * Fixed raw exit_group decoding.
750 * Fixed decoding of file descriptors on 64-bit architectures.
751 * Fixed a corner case in waitpid handling.
752 (Addresses Red Hat bug #663547).
753 * Fixed stat64 decoding on mips
754 (Addresses Debian bug #599028).
755 * Fixed misleading italics in the manual page.
756 (Addresses Debian bug #589323).
758 Noteworthy changes in release 4.5.20 (2010-04-13)
759 =================================================
762 * Implemented decoding of new linux syscalls: inotify_init1, recvmmsg.
763 * Implemented basic decoding of new linux syscalls: preadv, pwritev,
764 rt_tgsigqueueinfo, perf_event_open.
765 * Enhanced decoding of recently added syscalls on non-x86 architectures
766 by replacing a bare decoder with elaborate parsers enabled earlier
768 * Implemented -C option to combine regular and -c output.
769 (Addresses Debian bug #466196)
770 * Enhanced decoding of mbind and mremap syscalls.
771 * Enhanced SOL_PACKET socket options decoding.
772 * Regenerated list of ioctl names from linux 2.6.33.
773 * Added TILE architecture support.
776 * Fixed build with Linux kernel headers 2.6.32-rc5+.
777 (Addresses Debian bug #560516 and Fedora bug #539044)
778 * Fixed build on mips.
779 * Fixed handling of Linux systems without struct statfs64.
780 * Fixed reporting signal mask by sigreturn on powerpc.
781 * Fixed potential stack buffer overflow in select decoder.
782 (Addresses Fedora bug #556678)
783 * Corrected msgsnd indirect ipccall decoding.
784 * Corrected decoding of 64bit syscalls.
785 (Addresses Debian bug #570603)
786 * Corrected getsockopt decoding on architectures where
787 sizeof(long) > sizeof(int).
788 (Addresses Debian bug #494844)
789 * Corrected decoding of epoll_pwait.
790 (Addresses Debian bug #513014)
791 * Corrected handling of killed threads.
793 Noteworthy changes in release 4.5.19 (2009-10-21)
794 =================================================
796 * Changes in behavior
797 * When command exits, strace now exits with the same exit status.
798 If command is terminated by a signal, strace terminates itself
799 with the same signal, so that strace can be used as a wrapper
800 process transparent to the invoking parent process.
801 When using -p option, the exit status of strace is zero unless
802 there was an unexpected error in doing the tracing.
803 (Addresses Fedora bug #105371 and Debian bug #37665)
806 * Implemented decoding of new Linux syscalls: accept4, dup3,
807 epoll_create1, eventfd2, inotify_init1, pipe2, signalfd4.
808 * Implemented decoding of socket type flags introduced in Linux 2.6.27.
809 * Implemented decoding of accept4 socketcall.
810 * Enhanced prctl decoding.
811 * Enhanced nanosleep decoding.
812 * Enhanced ptrace decoding.
813 * Enhanced futex decoding.
814 * Enhanced CAP_* decoding.
815 * Enhanced SIOCS* ioctls decoding.
816 * Enhanced fcntl F_* flags decoding.
817 * Enhanced semop/semtimedop decoding.
818 * Updated ARM architecture support.
819 * Added Blackfin architecture support.
820 * Added AVR32 architecture support.
821 * Added CRIS architecture support.
822 * Made strace detect when traced process suddenly disappeared.
825 * Fixed syscall numbers for tee and sync_file_range.
826 (Addresses Debian bug #503124)
827 * Fixed several bugs in strings decoder, including potential heap
829 (Addresses Fedora bugs #470529, #478324 and #511035)
830 * Marked sendfile(2) as a network syscall.
831 (Addresses Debian bug #509499)
832 * Fixed accept(2) decoding.
833 (Addresses Debian bug #507573)
834 * Fixed sigtimedwait(2) decoding.
835 * Fixed build on ARM EABI.
836 (Addresses Debian bugs #520084 and #535564, and Fedora bug #507576)
837 * Fixed display of 32-bit fcntl(F_SETLK) on 64-bit architectures.
838 (Addresses Red Hat bug #471169)
839 * Fixed display of 32-bit argv array on 64-bit architectures.
840 (Addresses Fedora bug #519480)
841 * Fixed display of 32-bit struct sigaction on 64-bit architectures.
842 * Fixed HPPA architecture support.
843 (Addresses Debian bugs #437928 and #546619)
848 * Support new Linux/PPC system call subpage_prot and PROT_SAO flag.
849 * In sigaction system call, display sa_flags value along with SIG_DFL/SIG_IGN.
854 * -F is now deprecated, -f has traced vfork too on Linux for a long time now.
855 * Print O_CLOEXEC, MSG_CMSG_CLOEXEC flag bits.
856 * Improved output for prctl system call on Linux.
857 * Improved support for Linux/ARM.
858 * SA_NOMASK is now spelled SA_NODEFER, and SA_ONESHOT is spelled SA_RESETHAND.
863 * Improved output for delete_module, futex, and mbind system calls on Linux.
864 * Improved output for SG_IO ioctls on Linux.
865 * Support new Linux system calls move_pages, utimensat, signalfd, timerfd,
866 eventfd, getcpu, epoll_pwait.
871 * Several biarch improvements.
872 * Improved output for adjtimex, sysctl, quotactl, mount, umount.
873 * Support new Linux system calls *at, inotify*, pselect6, ppoll and unshare.
878 * Accept numeric system calls in -e.
883 * Introduce "-e trace=desc".
888 * Better x86-64 support for IA32 processes.
889 * Update PowerPC system calls.
890 * Better printing for Linux aio system calls.
894 * Quick fix release for build issues.
895 * One fix for Linux/ARM system call table.
900 * Print fault address for SIGSEGV/SIGBUS signals when available.
905 * Improve socket ioctl printing.
906 * Update Linux/IA64 syscall list.
907 * Fix Linux/x86-64 syscall argument extraction for 32-bit processes.
908 * Improve mount flags printing.
909 * Support symbolic printing of x86_64 arch_prctl parameters.
914 * Update syscall tables for Alpha, ARM, HPPA.
915 * Support new Linux syscalls mbind, set_mempolicy, get_mempolicy, waitid.
916 * Support Linux syscalls fadvise64, fadvise64_64, and epoll_*.
917 * Improve ioctl command name matching.
918 * Print RTC_* ioctl structure contents.
919 * Support newer RLIMIT_* values.
920 * Print struct cmsghdr details in sendmsg.
925 * Print attribute values in *xattr system calls on Linux.
926 * Include pread and pwrite calls in -e read and -e write tracing.
927 * Update SO_* and IP_* value lists and add IPV6_* values for socket options.
928 * Print clock_t values symbolically in Linux clock_* system calls.
932 * Bug fixes, Linux ioctl updates.
933 * David Miller contributed support for Linux/SPARC64.
941 * Update Linux ioctl lists.
942 * Update PF_* and AF_* value lists.
943 * The 4.5.3 -p behavior for NPTL threads applies only under -f, and got fixed.
948 * On Linux using NPTL threads, -p will now attach to all threads in a process.
949 * Handle new mq_* system calls in Linux 2.6.6 and later.
954 * Report some new VM_* bit values on Linux.
955 * Better output for Linux sched_* system calls.
960 * Display multiple ioctl name matches on Linux.
964 * New port to AMD's x86-64 architecture. One strace binary can
965 handle both new x86-64 and old i386 processes.
966 * Fixed support for LFS64 calls.
967 * New switch -E to add/remove environment variables for the command.
968 * Merged s390/s390x port.
969 * Trace an unbounded number of processes.
970 * Handle numerous new system calls in Linux 2.5, and new threads semantics.
971 * Fixed bugs with attach/detach leaving things stopped.
972 * Fixed traced process seeing ECHILD despite live, traced children
973 in waitpid calls with WNOHANG.
974 * Stuart Menefy contributed a port to Linux/SH.
975 * Stephen Thomas contributed a port to Linux/SH64.
976 * Many other bug fixes.
980 * Fix Linux/ia64 support, looks like someone renamed a few things on us
981 * Fix the ioctl setup for Linux, turned out it did not really work.
982 Improve the ioctl extractor as well so we decode some more ones.
986 * compile fixes for Linux/mips
990 * Linux ia64 and hppa ports added
991 * The usual Linux syscall updates (includes 32bit uid/gid support),
992 * Linux ioctl list updated
993 * Support IPv6 scope ids
994 * FreeBSD/i386 port added
995 * UnixWare and Solaris updates
996 * Better support for tracing multithreaded processes in Linux
1000 * Compiles on glibc2.0 systems again
1001 * Linux/S390 port added
1002 * The usual Linux syscall updates
1003 * we can follow fork on arm now
1007 * Linux/MIPS port added
1008 * Lots of Linux updates again
1009 * Improved IPv6 support
1015 * Compiles on glibc2.0 systems again
1019 * Get stat structure properly on Linux 64bit archs
1020 * Personalities work again
1021 * Compile correctly on SunOS again
1027 * Linux (ultra)sparc fixes
1034 * add support for more Linux architectures (powerpc, sparc, arm)
1035 * support lots more Linux syscalls
1036 * fix signal handling
1037 * add IPX and IPIP support
1038 * check stray syscall after execv
1039 * fix hanging children
1041 Changes in version 3.1
1042 ======================
1044 * Irix5 is supported
1045 * Linux 68k is supported
1046 * Linux alpha is supported
1047 * configure is upgraded to autoconf 2.x
1048 * using -f in combination with -e now works correctly
1049 * output can be piped to a program
1050 * tracing setuid programs works better
1051 * it is now reasonable to install strace setuid to root in some circumstances
1052 * new useful tracing names like file and process to trace whole
1053 classes of system calls, e.g. -efile traces all system calls that
1054 take a file name as an argument
1055 * IPC calls on SunOS 4.1.x are decoded
1056 * Linux program memory is reliably dereferenced
1057 * Linux decodes at least the name of all syscalls as of pre2.0.4
1058 * various cosmetic changes and bug fixes
1060 Changes from versions 2.x to version 3.0
1061 ========================================
1063 * filename arguments are neither abbreviated nor stringified
1064 * string arguments are now true C strings using octal instead of hex by default
1065 * preprocessor constants are never shortened (e.g. was RDONLY => now O_RDONLY)
1066 * by default the output for multiple processes now goes into one file
1067 * all structures, vectors, bitsets, etc. use consistent output formats
1068 * the -c option now means count calls, -i does what the old -c used to do
1070 New Features in version 3.0
1071 ===========================
1073 * non-ascii strings can be optionally printed entirely in hex
1074 * the output format is readable when multiple processes are generating output
1075 * exit values are printed in an alignment column
1076 * is is possible to suppress messages about attaching and detaching
1077 * various tracing features can be enabled on a per syscall/signal/desc basis
1078 * selective tracing of syscalls
1079 * selective printing of syscall structures
1080 * selective abbreviation of long structures on a per syscall basis
1081 * selective printing of raw syscall arguments and results
1082 * selective tracing of signals
1083 * selective dumping of all I/O read from file descriptors
1084 * selective dumping of all I/O written to file descriptors
1085 * optional counting of time, calls, and errors for each syscall