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 * Updated lists of MSG_* and SHM_* constants.
14 * Added manual page for the strace-log-merge command.
17 * Fixed multi-personality support in cross builds.
19 Noteworthy changes in release 4.20 (2017-11-13)
20 ===============================================
23 * Implemented decoding of NETLINK_NETFILTER netlink message types and flags.
24 * Implemented decoding of SECCOMP_GET_ACTION_AVAIL operation of seccomp
26 * Updated lists of ARPHRD_*, BPF_*, ETH_P_*, LOOP_*, MADV_*,
27 MEMBARRIER_CMD_*, MFD_*, SECCOMP_*, SO_*, SOL_*, TCP_*, and UFFD_FEATURE_*
29 * Added decoding of statx syscall on hppa.
30 * Updated lists of ioctl commands from Linux 4.14.
33 * Fixed powerpc personality support on powerpc64.
35 Noteworthy changes in release 4.19 (2017-09-05)
36 ===============================================
38 * Changes in behaviour
39 * Changed formatting of personality names on tile architecture in order
40 to make it in line with other multi-personality architectures.
41 * Changed field output order in struct v4l2_requestbuffers to improve in/out
43 * Changed handling of multiple signal= specifications in an injection
44 expression: multiple specification now leads to error instead of implicit
45 usage the last specification.
48 * Enhanced decoding of optlen argument of getsockopt syscall.
49 * Enhanced decoding of SO_LINGER option of getsockopt and setsockopt syscalls.
50 * Enhanced decoding of SO_PEERCRED option of getsockopt syscall.
51 * Enhanced decoding of IP_ADD_MEMBERSHIP, IP_DROP_MEMBERSHIP,
52 IPV6_ADD_MEMBERSHIP, IPV6_DROP_MEMBERSHIP, IPV6_JOIN_ANYCAST,
53 IPV6_LEAVE_ANYCAST, MCAST_JOIN_GROUP, and MCAST_LEAVE_GROUP options
54 of setsockopt syscall.
55 * Enhanced decoding of KEYCTL_DH_COMPUTE operation of keyctl syscall
56 (KDF parameters decoding).
57 * Implemented decoding of KEYCTL_RESTRICT_KEYRING operation of keyctl syscall.
58 * Enhanced decoding of UFFDIO_API ioctl command.
59 * Enhanced decoding of BPF_PROG_LOAD, BPF_MAP_CREATE, BPF_MAP_LOOKUP_ELEM,
60 and BPF_MAP_GET_NEXT_KEY commands of bpf syscall.
61 * Implemented decoding of linux socket filter programs specified
62 for SO_ATTACH_FILTER and SO_ATTACH_REUSEPORT_CBPF socket options.
63 * Implemented decoding of inet_diag_req_v2, inet_diag_req_compat,
64 packet_diag_msg, and smc_diag_msg netlink attributes of NETLINK_SOCK_DIAG.
65 * Implemented NETLINK_SELINUX protocol specific decoding.
66 * Implemented decoding of netlink message ack flags.
67 * Implemented decoding of nlmsgerr netlink attributes.
68 * Implemented basic protocol specific decoding of NETLINK_CRYPTO.
69 * Implemented decoding of crypto_user_alg netlink attributes
71 * Implemented basic protocol specific decoding of addr, addrlabel, dcb, link,
72 mdb, neigh, neightbl, netconf, nsid, route, rule, tc, and tca messages
74 * Implemented decoding of NETLINK_KOBJECT_UEVENT messages.
75 * Improved handling of unexpected tracees (the ones that cloned with
76 CLONE_PARENT/CLONE_PTRACE or called PTRACE_TRACEME on themselves): they
77 are now PTRACE_DETACH'ed instead of PTRACE_CONT'ed.
78 * Updated lists of BPF_*, KEY_*, RWF_*, SCM_*, SO_*, and *_MAGIC constants.
79 * Added decoding of arch_prctl syscall on x86.
80 * Added decoding of seccomp, bpf, userfaultfd, membarrier, mlock2,
81 copy_file_range, preadv2, pwritev2, and statx on alpha.
82 * Added decoding of statx syscall on microblaze.
83 * Added decoding of s390_guarded_storage syscall on s390.
84 * Updated lists of ioctl commands from Linux 4.13.
85 * Enhanced manual page.
88 * Fixed printing of group_req structure on non-native personalities.
89 * Fixed output formatting of blkpg_ioctl_arg, dm_name_list, and iocb
91 * Fixed formatting of nul-terminated strings which have kernel-imposed size
93 * Fixed printing of paths that hit PATM_MAX limit in order to match kernel's
95 * Fixed build warnings on Android mips64.
96 * Fixed unused function "is_negated_errno" build warning when built
98 * Fixed syscall number and arguments retrieval behaviour on sparc64 and
99 mips o32 after prctl(PR_SET_DUMPABLE, 0) makes PTRACE_PEEKTEXT impossible
100 to use if Linux kernel has commit v4.10-rc1~114^2~2.
101 * Fixed path tracing for execveat, symlink, symlinkat, inotify_add_watch,
102 and inotify_init syscalls.
103 * Fixed personality switch printing on sparc64 and risc-v.
105 Noteworthy changes in release 4.18 (2017-07-05)
106 ===============================================
109 * Implemented decoding of SCM_TIMESTAMP* control messages.
110 * Implemented decoding of netlink NLMSG_DONE messages.
111 * Implemented decoding of netlink generic nlmsg_type and nlmsg_flags.
112 * Implemented decoding of NETLINK_AUDIT, NETLINK_NETFILTER, NETLINK_ROUTE,
113 NETLINK_SELINUX, NETLINK_SOCK_DIAG, and NETLINK_XFRM message types.
114 * Implemented decoding of NETLINK_GENERIC protocol families.
115 * Implemented basic protocol specific decoding of AF_INET, AF_INET6,
116 AF_NETLINK, AF_PACKET, AF_SMC, and AF_UNIX messages of NETLINK_SOCK_DIAG.
117 * Implemented basic decoding of netlink attributes.
118 * Implemented basic protocol specific decoding of AF_INET, AF_NETLINK,
119 AF_PACKET, AF_SMC, and AF_UNIX netlink attributes of NETLINK_SOCK_DIAG.
120 * Implemented decoding of inet_diag_msg, netlink_diag_msg, and unix_diag_msg
121 netlink attributes of NETLINK_SOCK_DIAG.
122 * Updated lists of ARPHRD_*, KEYCTL_*, NDIAG_SHOW_*, RTM_*, SCM_*, SCTP_*,
123 SO_*, V4L2_*, and prctl ARCH_* constants.
124 * Updated lists of ioctl commands from Linux 4.12.
127 * In interactive mode (-I2), those signals that were blocked at startup
128 will remain blocked for the whole period of strace execution.
129 * strace no longer resets SIGCHLD handler in tracees to the default action.
130 * When traced command is terminated by a blocked signal, strace unblocks
131 that signal to ensure its own termination with the same signal.
132 * Fixed corner cases in decoding of old sigaction syscall.
133 * Fixed build with old kernel headers on mips.
134 * Fixed build on aarch64 and tile with glibc >= 2.26.
135 * Fixed build on arc and nios2.
137 Noteworthy changes in release 4.17 (2017-05-24)
138 ===============================================
140 * Changes in command line syntax
141 * Syscall classes specified in -e trace= option now have % prefix (like
142 -e trace=%process). Old style class names without leading % are still
143 supported, but considered deprecated now.
146 * Optimized syscall filtering.
147 * Improved representation of timestamps.
148 * Enhanced decoding of sched_setattr syscall.
149 * Added -e trace=%stat option for tracing variants of stat syscall.
150 * Added -e trace=%lstat option for tracing variants of lstat syscall.
151 * Added -e trace=%fstat option for tracing variants of fstat and fstatat
153 * Added -e trace=%%stat option for tracing syscalls used for querying file
154 status information (stat, lstat, fstat, fstatat, statx, and their
156 * Added -e trace=%statfs option for tracing statfs, statfs64 and statvfs
158 * Added -e trace=%fstatfs option for tracing fstatfs, fstatfs64 and fstatvfs
160 * Added -e trace=%%statfs option for tracing syscalls used for querying file
161 system statistics information (statfs-like, fstatfs-like and ustat).
162 * Added -e trace=/regex option for filtering syscalls using regular
164 * Added support for prepending of question mark before syscall qualification
165 in -e trace expressions in order to suppress error in case no syscalls
166 matched the provided qualification.
167 * Implemented decoding of signal mask in rt_sigreturn syscall on alpha, arc,
168 arm, avr32, bfin, cris, hppa, m68k, metag, microblaze, mips, nios2, or1k,
169 powerpc, powerpc64, riscv, sh, sh64, sparc, sparc64, tile, x86, and xtensa
171 * Implemented decoding of statx syscall.
172 * Implemented decoding of NS_* ioctl commands.
173 * Implemented decoding of the remaining V4L2_BUF_TYPE_* types.
174 * Implemented decoding of VIDIOC_[SG]_TUNER ioctl commands.
175 * Implemented decoding of NLMSG_ERROR netlink messages.
176 * Improved decoding of BPF_PROG_ATTACH command of bpf syscall.
177 * Improved decoding of misplaced parts in DM_* ioctl commands.
178 * Updated lists of ioctl commands from Linux 4.11.
181 * Fixed decoding of flags argument of preadv2 and pwritev2 syscalls on x32.
182 * Fixed the number of arguments and tracing flags of alpha specific syscalls.
183 * Fixed decoding of old sigsuspend syscall on alpha, cris, mips, powerpc,
184 powerpc64, sh, sh64, sparc, and sparc64.
185 * Fixed decoding of sgetmask and ssetmask syscalls on 64-bit architectures.
186 * Fixed decoding of netlink messages received within struct msghdr.
187 * Worked around a bug in miscompiled aarch64 kernels leading to the 3rd
188 argument of sched_getattr syscall being not quite 32-bit.
189 * Fixed corner cases of printing inaccessible times argument of utimes
190 and futimesat syscalls.
192 Noteworthy changes in release 4.16 (2017-02-14)
193 ===============================================
196 * Implemented syscall return value injection (-e inject=SET:retval= option).
197 * Implemented signal injection (-e inject=SET:signal= option).
198 * Implemented decoding of SUID_DUMP_* constants in PR_[GS]ET_DUMPABLE.
199 * Implemented decoding of all SG_* ioctl commands.
200 * Implemented decoding of ustat syscall.
201 * Implemented decoding of BPF_OBJ_PIN, BPF_OBJ_GET, BPF_PROG_ATTACH,
202 and BPF_PROG_DETACH commands of bpf syscall.
203 * Enhanced decoding of sg_io_hdr and sg_io_v4 structures.
204 * Enhanced decoding of get_robust_list, getrandom, io_submit, set_robust_list
206 * Enhanced decoding of entities of kernel long type on x32 and mips n32 ABIs.
207 * Updated lists of IP_*, IPV6_*, and LOOP_* constants.
208 * Updated lists of ioctl commands from Linux 4.10.
209 * Added decoding of recently added syscalls on avr32, microblaze, ppc,
213 * Fixed pathmatch of oldselect syscall on 64-bit architectures.
214 * Fixed decoding of mmap2 syscall on s390 when arguments are not available.
215 * Fixed decoding of kexec_file_load, mprotect, pkey_mprotect, prctl, preadv*,
216 and pwritev* syscalls on x32.
217 * Fixed printing of string arguments of getxattr and setxattr syscalls
218 when -s option is used to limit the printed string size.
219 * Fixed decoding of ifconf, ifreq, and loop_info structures on non-native
221 * Fixed decoding of SG_* and LOOP_* ioctl commands.
222 * Fixed build on mips with musl libc.
223 * Fixed cross-building of ioctlsort.
224 * Applied minor formatting fixes to the manual page.
226 Noteworthy changes in release 4.15 (2016-12-14)
227 ===============================================
229 * Changes in behavior
230 * Time stamps are now printed according to ISO 8601.
231 * Changed output format of val3 parameter of futex FUTEX_WAKE_OP operation.
232 * The last argument of mincore, sched_getaffinity, and sched_setaffinity
233 syscalls is now formatted as an array.
236 * Implemented syscall fault injection (-e fault=... option).
237 * Implemented decoding of DM_* ioctl commands.
238 * Implemented decoding of attr parameter of perf_event_open syscall.
239 * Implemented decoding of pkey_alloc, pkey_free, and pkey_mprotect syscalls.
240 * Implemented dumping of mq_timedsend and mq_timedreceive syscalls.
241 * Implemented decoding of PR_SET_FP_MODE and PR_GET_FP_MODE operations
243 * Implemented PTRACE_GETREGS API support on m68k.
244 * Updated lists of ARCH_*, BPF_*, BTRFS_*, FALLOC_*, MS_*, *_MAGIC,
245 and V4L2_* constants.
246 * Updated lists of ioctl commands from Linux 4.9.
247 * Added decoding of recently added syscalls on arc, x32, and xtensa.
248 * Enhanced manual page.
251 * Fixed corner cases in decoding of exit, exit_group, futimesat, getgroups,
252 getresuid, init_module, inotify_init1, kcmp, kexec_load, lookup_dcookie,
253 mq_getsetattr, mq_notify, mq_open, mq_timedreceive, mq_timedsend,
254 name_to_handle_at, prctl, process_vm_readv, process_vm_writev, setfsuid,
255 setgroups, setns, unshare, and utimes syscalls.
256 * Fixed handling of verbose flag in printing of controls array
257 of struct v4l2_ext_controls.
258 * Fixed omission of field names in the output of capability, sigaction,
259 sigevent, statfs, timespec, timeval, and utimbuf structures.
260 * Fixed printing of unknown syscalls in siginfo structure.
261 * Fixed decoding of ioctl constants on m68k.
262 * Fixed cris architecture support.
263 * Fixed cross build when host compiler does not support the same
264 set of warning flags as the cross compiler.
265 * Fixed build on SLE10 and SLE11.
267 Noteworthy changes in release 4.14 (2016-10-04)
268 ===============================================
270 * Changes in behavior
271 * When using -p option without a command and no processes has been attached,
272 strace exits with exit status 1.
275 * Added printing of the mode argument of open and openat syscalls
276 when O_TMPFILE flag is set. (Addresses Fedora bug #1377846).
277 * Enhanced -e abbrev=set, -e raw=set, and -e verbose=set.
278 * Enhanced decoding of futex, keyctl, quotactl, timerfd_settime,
279 and aio family syscalls.
280 * Implemented fetching of the 7th subcall argument on mips o32.
281 * Updated lists of BPF_*, ETH_P_*, KEXEC_ARCH_*, SCTP_*, TCP_*, and *_MAGIC
283 * Updated lists of ioctl commands from Linux 4.8.
284 * Added decoding of new syscalls on sh and sh64.
285 * Added RISC-V architecture support.
288 * Marked io_setup and io_destroy as memory mapping related syscalls.
289 * Fixed leakage of placeholder descriptors to tracees.
290 * Fixed printing of mode_t, umode_t, and umask types.
291 * Fixed decoding of iovec arrays without a limit on total data size.
292 * Fixed decoding of fadvise64, fallocate, futex, keyctl, quotactl, readahead,
293 and ipc family syscalls.
294 * Fixed decoding of invalid syscalls mapped to indirect subcalls.
295 * Fixed decoding of struct btrfs_ioctl_vol_args_v2 on non-native
297 * Fixed decoding of PTRACE_DETACH on sparc and sparc64.
298 * Fixed decoding of struct stat64 on sparc64.
299 * Fixed decoding of uid and gid-related syscalls on sparc64.
300 * Fixed decoding of the forth argument of semctl syscall on sparc64.
301 * Fixed values of tty ioctl constants on sparc64.
302 * Fixed sparc personality support on sparc64.
304 Noteworthy changes in release 4.13 (2016-07-26)
305 ===============================================
308 * Implemented a general netlink socket parser.
309 * Enhanced decoding of socket addresses.
310 * Enhanced decoding of cmsghdr, msghdr, and mmsghdr structures.
311 * Enhanced decoding of accept, accept4, bind, getpeername, getsockname,
312 ipc, recvfrom, recvmsg, recvmmsg, sendto, sendmmsg, and socketcall syscalls.
313 * Updated lists of AF_*, BPF_MAP_TYPE_*, KEY_*, KEYCTL_*, RWF_*, SS_*,
314 and *_MAGIC constants.
315 * Updated lists of ioctl commands from Linux 4.7.
318 * Fixed decoding of pid_t argument of prlimit64 syscall.
319 * Fixed sign extension issues in the parser of struct rusage.
320 * Fixed race condition in decoding of timeout argument of recvmmsg and
321 rt_sigtimedwait syscalls.
322 * Fixed build with fresh linux kernel headers.
324 Noteworthy changes in release 4.12 (2016-05-31)
325 ===============================================
328 * Implemented simultaneous use of -p option and tracing of a command.
329 (addresses Debian bug #549942).
330 * Implemented caching of netlink conversations to reduce amount of time
331 spent in decoding socket details in -yy mode.
332 * Implemented -yy mode decoding of protocol:portid pairs associated with
333 netlink socket descriptors.
334 * Implemented decoding of copy_file_range, preadv2, and pwritev2 syscalls.
335 * Implemented dumping of preadv, preadv2, pwritev, pwritev2, and vmsplice
337 * Implemented decoding of BTRFS_* and UFFDIO_* ioctl commands.
338 * Enhanced decoding of BLK*, EVIOC*, RTC_*, and VIDIOC_* ioctl commands.
339 * Enhanced decoding of fstatfs, fstatfs64, get_mempolicy, getdents,
340 getdents64, getgroups, getpriority, kill, mbind, migrate_pages, mknod,
341 mknodat, personality, poll, ppoll, quotactl, rt_sigpending,
342 rt_sigqueueinfo, rt_sigtimedwait, rt_tgsigqueueinfo, sched_getaffinity,
343 sched_setaffinity, seccomp, set_mempolicy, setgroups, setpriority, statfs,
344 statfs64, tgkill, waitid, and xattr family syscalls.
345 * Enhanced decoding of getxpid, getxuid, and getxgid syscalls on alpha.
346 * Enhanced decoding of pipe syscall on alpha, ia64, mips, sh, and sparc.
347 * Added decoding of bind, listen, and setsockopt direct syscalls on sparc.
348 * Added decoding of osf_statfs64 and osf_fstatfs64 syscalls on alpha.
349 * Added decoding of fadvise64 and fadvise64_64 on s390.
350 * Updated lists of AF_*, BPF_MAP_TYPE_*, CLONE_*, EPOLL*, IPV6_*, MADV_*,
351 MSG_*, PTRACE_*, SEGV_*, SO_*, SOL_*, *_MAGIC, and quotactl constants.
352 * Updated lists of ioctl commands from Linux 4.6.
355 * Fixed build on arc, metag, nios2, or1k, and tile architectures.
356 * Fixed decoding of 32-bit times syscall return value on 64-bit architectures.
357 * Fixed decoding of mlock2 syscall on sparc.
358 * Fixed decoding of osf_shmat syscall on alpha.
359 * Fixed decoding of syscalls unknown to the kernel on s390/s390x.
360 (addresses Debian bug #485979 and Fedora bug #1298294).
361 * Fixed decoding of preadv syscall in case of short read.
362 * Fixed decoding and dumping of readv syscall in case of short read.
363 * Fixed dumping of recvmsg and recvmmsg syscalls in case of short read.
364 * Fixed decoding of mincore syscall's last argument.
365 * Fixed remaining errors in mapping between syscall numbers and numbers
366 of syscall arguments.
367 * Applied various fixes to strace-graph script.
369 Noteworthy changes in release 4.11 (2015-12-21)
370 ===============================================
372 * Changes in behavior
373 * Some syscalls have different names depending on architecture and
374 personality. In these cases, syscall filtering and printing now
375 consistently uses the names that match corresponding __NR_* kernel
376 macros of the tracee's architecture and personality.
377 * Added strace prefix to all diagnostic messages.
380 * Enhanced and extended test suite.
381 * Implemented reliable tracing of processes whose personality differs
382 from the personality of strace, fixed decoding of 32-bit personality
383 syscalls on 64-bit architectures.
384 * When some data referenced by syscall arguments is irrelevant or cannot
385 be read from tracee's memory, strace now prints its address consistently.
386 * When a syscall is restarted using restart_syscall mechanism, strace now
387 shows the syscall name on architectures that expose this information.
388 * Print values returned by epoll_create1, eventfd, eventfd2, fanotify_init,
389 inotify_init1, perf_event_open, pipe, pipe2, signalfd, signalfd4, socket,
390 socketpair, timerfd, and timerfd_create syscalls, as well as F_DUPFD and
391 F_DUPFD_CLOEXEC fcntl commands, as file descriptors.
392 * Optimized decoding of indirect socket syscalls.
393 * Implemented decoding of nanoseconds along with seconds in stat family
394 syscalls (addresses Fedora bug #1251176).
395 * Implemented decoding of struct statfs.f_flags in statfs syscall.
396 * Implemented decoding of siginfo_t.si_syscall and siginfo_t.si_arch
398 * Implemented decoding of indirect syscall on mips o32.
399 * Implemented decoding of IPPROTO_IP control messages.
400 * Implemented decoding of setsockopt syscall multicast arguments.
401 * Enhanced decoding of struct sigevent.
402 * Enhanced decoding of block, loop, mtd, ptp, rtc, SG_IO, socket, tty,
403 and v4l2 ioctl syscall arguments.
404 * Enhanced decoding of epoll_create, fcntl, fcntl64, futex, getdents,
405 getdents64, getsockopt, io_*, mount, msgctl, prctl, quotactl, recvfrom,
406 sendfile, setsockopt, and shmctl syscalls.
407 * Implemented decoding of bpf, execveat, ioperm, iopl, kcmp, kexec_file_load,
408 lookup_dcookie, membarrier, memfd_create, mlock2, name_to_handle_at,
409 open_by_handle_at, sched_getattr, sched_setattr, and userfaultfd syscalls.
410 * Updated lists of AF_*, EPOLL_*, FALLOC_FL_*, F_*, INPUT_PROP_*, IPPROTO_*,
411 IPV6_*, IP_*, KEY_*, LOCK_*, MNT_*, MS_*, PACKET_*, PERF_FLAG_*, PF_*,
412 PR_*, PTRACE_O_*, RENAME_*, SCTP_*, SECBIT_*, SO_*, TCP_*, and siginfo_t
414 * Added Nios II architecture support.
415 * Added new syscall entries to match Linux 4.4.
418 * Fixed potential short read of strings from tracee's memory.
419 * Fixed -qq option in conjunction with -o option.
420 * Fixed filtering of <unavailable> syscalls.
421 * Fixed decoding of ioctl syscall command on aarch64 and 32-bit architectures
422 with 64-bit aligned structures.
423 * Fixed decoding of eventfd2, epoll_create1, signalfd4, and sync_file_range2
424 syscall flags arguments.
425 * Fixed decoding of 4th argument of clock_nanosleep syscall.
426 * Fixed decoding of getpagesize syscall on m68k.
427 * Fixed decoding of getrandom and seccomp syscalls on aarch64.
428 * Fixed decoding of timezone argument of gettimeofday and settimeofday
430 * Fixed decoding of offset argument of mmap2 syscall on arm, sparc,
432 * Fixed decoding of pipe syscall on alpha and mips.
433 * Fixed decoding of pipe2 syscall on ia64, sh, sparc, and sparc64.
434 * Fixed decoding of signal mask argument of pselect6 syscall on x32.
435 * Fixed decoding of signal mask of rt_sigreturn syscall on aarch64, m68k,
437 * Fixed decoding of 4th argument of semctl indirect syscall.
438 * Fixed decoding of sa_restorer and sa_mask of sigaction syscall on m68k.
439 * Fixed decoding of statfs64 and fstatfs64 syscalls on arm eabi.
440 * Fixed decoding of struct dirent on x32.
441 * Fixed decoding of times syscall return value on mips n32 and x32.
442 * Fixed decoding of path argument of umount2 syscall
443 (addresses Debian bug #785050).
444 * Worked around a kernel bug in tracing privileged executables.
445 * Fixed various errors in mapping between syscall numbers and associated
446 information like the number of syscall arguments, the name of syscall,
449 Noteworthy changes in release 4.10 (2015-03-06)
450 ===============================================
453 * Added -yy option to print protocol and address information associated with
455 * Extended "-e read=set" and "-e write=set" options to cover sendmsg,
456 recvmsg, sendmmsg, and recvmmsg syscalls.
457 * Implemented full 32-bit decoding of ioctl commands
458 (addresses Debian bug #692913 and Fedora bug #902788).
459 * Implemented PTRACE_GETREGS API support on ia64.
460 * Implemented PTRACE_GETREGS API support on mips.
461 * Implemented PTRACE_GETREGSET API support on s390/s390x.
462 * Implemented decoding of getrandom and seccomp syscalls.
463 * Implemented full decoding of 64-bit capability sets.
464 * Implemented decoding of all prctl commands.
465 * Implemented decoding of parametrized ioctl commands.
466 * Implemented decoding of evdev ioctl commands.
467 * Implemented decoding of v4l ioctl commands.
468 * Implemented decoding of SG_IO v4 ioctl commands.
469 * Implemented decoding of FIFREEZE/FITHAW/FITRIM ioctl commands.
470 * Implemented decoding of FALLOC_FL_* fallocate flags.
471 * Implemented decoding of rt_sigreturn signal mask on aarch64,
473 * Enhanced socket decoder to support bluetooth sockets.
474 * Enhanced decoding of unlisted ioctl commands.
475 * Enhanced decoding of getsockopt and setsockopt syscall.
476 * Enhanced decoding of sysinfo syscall.
477 * Enhanced decoding of struct cmsghdr.
478 * Enhanced decoding of wait status.
479 * Enhanced aio support on non-x86 architectures by using external libaio.h.
480 * Added O_TMPFILE to the list of recognized open mode flags.
481 * Updated the list of filesystem type constants that is used in decoding
482 statfs family syscalls.
483 * Updated lists of CAP_*, PR_*, PTRACE_*, SCHED_*, SO_*, SOL_*, SWAP_FLAG_*,
485 * Updated lists of signal constants from Linux 3.19.
486 * Updated lists of errno constants from Linux 3.19.
487 * Updated lists of ioctl commands from Linux 3.9.
488 * Added new syscall entries to match Linux 3.19.
491 * Fixed various errors in mapping between syscall numbers and associated
492 information like the number of syscall arguments, the name of syscall,
494 * Fixed quoting issues in printing descriptors, filenames, network interface
495 names, struct utsname members, device/volume names of BLK* ioctl commands.
496 * Fixed uid_t/git_t decoding.
497 * Fixed potential out-of-bounds read issues in getdents/getdents64 decoders.
498 * Fixed potential open flags truncation on some architectures.
499 * Fixed decoding of struct ifreq.ifr_name.
500 * Fixed decoding of SIOCSIFNAME ioctl command.
501 * Fixed decoding of RENAME_* renameat2 flags.
502 * Fixed decoding of UTIME_NOW/UTIME_OMIT timeval structures.
503 * Fixed decoding of indirect ipc subcalls on some architectures.
504 * Fixed decoding of fanotify_mark syscall on 32-bit architectures.
505 * Fixed decoding of 32-bit stat structures on 64-bit architectures.
506 * Fixed decoding of 32-bit struct cmsghdr on 64-bit architectures.
507 * Fixed decoding of 32-bit preadv/pwritev offset on 64-bit architectures.
508 * Fixed decoding of sigreturn/rt_sigreturn signal mask on ia64, ppc, ppc64,
509 sparc, sparc64, mips, and s390.
510 * Fixed instruction pointer output (-i option) on architectures that support
511 several personalities.
512 * Fixed behaviour of "-e read=set" and "-e write=set" when read and write
514 * Fixed build on systems where struct sigaction has no sa_restorer member.
515 * Fixed build with uclibc and musl libc.
518 * Linux kernel >= 2.5.46 is required.
519 Older versions without a decent PTRACE_SETOPTIONS support will not work.
520 * On mips, linux kernel >= 2.6.15 is required.
521 Older versions without a decent PTRACE_GETREGS support will not work.
522 * On s390 and s390x, linux kernel >= 2.6.27 is required.
523 Older versions without a decent PTRACE_GETREGSET support will not work.
525 Noteworthy changes in release 4.9 (2014-08-15)
526 ==============================================
528 * Changes in behavior
529 * Disabled OABI support on ARM EABI systems by default,
530 added --enable-arm-oabi option to enable it at configure time.
533 * Added experimental -k option to print stack trace after each traced syscall.
534 * Added -w option to produce stats on syscall latency.
535 (addresses Debian bug #457497).
536 * Added ARC architecture support.
537 * Added PTRACE_GETREGS API support on PowerPC.
538 * Enhanced Bionic libc and musl libc support.
539 * Enhanced tracing of x86 personality processes on x86_64 and x32.
540 * Enhanced tracing of ARM personality processes on AArch64.
541 * Enhanced 32/64bit personality detection on PowerPC.
542 * Implemented decoding of add_key, ioprio_get, ioprio_set, kexec_load, keyctl,
543 renameat2, and request_key syscalls.
544 * Robustified decoding of select, pselect, and io_submit syscalls.
545 * Enhanced decoding of delete_module, fanotify_init, fanotify_mark, fcntl,
546 setdomainname, sethostname, setns, and sync_file_range syscalls.
547 * Enhanced decoding of signal bitmasks.
548 * Enhanced decoding of file descriptors.
549 * Enhanced siginfo_t decoding.
550 * Enhanced PF_NETLINK decoding.
551 * Updated CLOCK_* constants
552 (addresses Fedora bug #1088455).
553 * Added new syscall entries to match Linux 3.16.
556 * Added shmat and shmdt to the set of memory mapping related syscalls.
557 * Fixed detaching from stopped processes.
558 * Fixed fanotify_mark decoding on 32bit architectures.
559 * Fixed offset decoding in preadv and pwritev syscalls.
560 * Fixed select decoding for glibc in _FORTIFY_SOURCE mode.
561 * Fixed decoding of epoll_ctl syscall with EPOLL_CTL_DEL argument.
562 * Fixed build when <sys/ptrace.h> and <linux/ptrace.h> conflict
563 (addresses Fedora bug #993384).
564 * Miscellaneous corrections in the manual page.
565 (Addresses Debian bug #725987).
567 Noteworthy changes in release 4.8 (2013-06-03)
568 ==============================================
570 * Changes in behavior
571 * In case of normal strace termination, when the trace output is
572 redirected to a pipe, strace now closes it and waits for the pipe
573 process termination before exit.
576 * Implemented tracing using PTRACE_SEIZE API (when available).
577 * Implemented more reliable PTRACE_GETREGSET-based process personality
578 detection on x86-64 and x32 (when available).
579 * Added -e trace=memory option for tracing memory mapping related syscalls.
580 * Documented -b option.
581 * Allowed exit status messages to be suppressed by giving -q option twice.
582 * Added AArch64 architecture support
583 (addresses Debian bug #693074 and Fedora bug #969858).
584 * Added support for OpenRISC 1000, Meta, and Xtensa architectures.
585 * Added tilegx personality support for Tile.
586 * Enhanced support of NOMMU architectures.
587 * Enhanced decoding of getdents, mmap, perf_event_open, ptrace, and
589 * Added new syscall entries to match Linux 3.9.
590 * Regenerated the list of common ioctl names from Linux 3.9.
591 * Updated the list of errno constants.
592 * Updated lists of AF_*, MADV_*, MAP_*, MSG_*, MS_*, PF_*, PR_*,
593 PTRACE_O_*, and TCP_* constants.
594 * Implemented decoding of UBI ioctls.
595 * Removed redundant "*32" ioctl names.
598 * Fixed ERESTARTNOINTR leaking to userspace on ancient kernels
599 (addresses Fedora bug #659382).
600 * Fixed kernel release string parsing
601 (addresses Debian bug #702309).
602 * Fixed decoding of *xattr syscalls
603 (addresses Fedora bug #885233).
604 * Fixed handling of files with 64-bit inode numbers by 32-bit strace
605 (addresses Fedora bug #912790).
606 * Fixed tracing forks on SPARC.
607 * Fixed decoding of fadvise64, fallocate, ftruncate64, io_submit, pread,
608 preadv, pwrite, pwritev, readahead, sigaltstack, sync_file_range, sysctl,
609 and truncate64 syscalls.
610 * Fixed categories of multiple syscalls on most of supported architectures.
611 * Fixed decoding of non-native 32-bit personality recv[m]msg syscalls.
612 * Fixed decoding of multiple 32-bit personality syscalls on x32.
613 * Fixed decoding of long long syscall arguments on ARM, MIPS/o32, PowerPC,
614 S390x, and Tile architectures.
615 * Fixed semtimedop decoding on S390x.
616 * Fixed sram_alloc decoding on Blackfin.
617 * Fixed build when process_vm_readv is a stab.
618 * Fixed build with older versions of libaio.h.
620 Noteworthy changes in release 4.7 (2012-05-02)
621 ==============================================
623 * Changes in behavior
624 * strace no longer suspends waitpid until there is a child
625 for waitpid'ing process to collect status from.
626 * strace no longer detaches from a tracee which is supposed
628 * strace now issues a new message: "+++ exited with EXITCODE +++"
629 which shows exact moment strace got exit notification,
630 analogous to existing "+++ killed by SIG +++" message.
633 * Added x32 personality support (x86_64 architecture).
634 * Added -y and -P options to print file descriptor paths and
635 filter by those paths.
636 * Added -I option to control strace interactivity.
637 * Allowed -p option to take comma or whitespace-separated list of PIDs.
638 * Added strace_log_merge script helper to merge timestamped "strace -ff"
640 * Implemented decoding of clock_adjtime, get_robust_list, migrate_pages,
641 preadv, prlimit64, process_vm_readv, process_vm_writev, pwritev,
642 recvmmsg, recvmsg, rt_tgsigqueueinfo, sendmmsg, setns, set_robust_list,
643 sched_rr_get_interval, splice, syslog, tee and vmsplice syscalls.
644 * Enhanced decoding of capget, capset, getrlimit, flistxattr, io_submit,
645 listxattr, setrlimit and swapon syscalls.
646 * Implemented decoding of loop and mtd ioctls.
647 * Added syscall entries for new linux syscalls.
648 * Added syscall entries for direct socket system calls on powerpc.
649 * Updated the list of errno constants.
650 * Updated lists of MSG_*, STA_*, and TCP_* constants.
651 * Regenerated the list of ioctl names from Linux 3.3.
652 * Enhanced switching between processes with different personalities.
653 * Enhanced signals reporting by using short signal names.
654 * Made ERESTART* messages more descriptive.
655 * Made parsing of numbers from strings more robust.
656 * Added support for compat_statfs64 and statfs64.f_flags.
657 * Changed read of data blocks to use single process_vm_readv syscall
658 (when available) instead of several PTRACE_PEEKDATA operations.
659 * Changed read of registers on x86 and x86-64 to use single PTRACE_GETREGS
660 operation instead of several PTRACE_PEEKUSER operations.
661 * Applied various optimizations to make strace work faster.
664 * Implemented proper handling of real SIGTRAPs on kernels supporting
665 PTRACE_O_TRACESYSGOOD.
666 (Addresses Fedora bug #162774).
667 * Fixed sockaddr_un.sun_path name in decoded output.
668 (Addresses Debian bug #554946).
669 * Fixed to avoid potential core file clobbering on exit.
670 (Addresses Debian bug #656398).
671 * Fixed a typo in documentation.
672 (Addresses Debian bug #653309).
673 * Fixed decoding of timer id returned by timer_create.
674 * Fixed epoll_create1, epoll_wait and epoll_pwait decoding.
675 * Fixed *at syscalls flags decoding.
676 * Fixed ARM EABI 64-bit syscall's arguments decoding.
677 * Fixed semtimedop decoding on s390.
678 * Fixed osf_sigprocmask decoding on alpha.
679 * Fixed ipc and socket subcall decoding on several architectures.
680 * Corrected syscall entries for epoll_pwait, epoll_create, epoll_ctl,
681 epoll_wait, mincore, mlockall, prctl, reboot, sendfile, sendfile64,
682 sendmsg, sgetmask, ssetmask, swapon, tgkill and tkill syscalls.
683 * Corrected io_* syscall entries on ARM.
684 * Fixed PID prefix printing in "strace -oLOG -ff -p1 -p2 -p3" case.
685 * Fixed logging of unfinished lines in "strace -oLOG -ff" case.
686 * Fixed build when libaio-devel is not available.
687 * Fixed configure checks for PTRACE_* constants.
688 * Fixed compilation warnings remained on several architectures.
691 * Removed all non-Linux code. After years of neglect, that dead code
692 just hampered further strace development.
693 * Linux kernel >= 2.6.18 is recommended. Older versions might still
694 work but they haven't been thoroughly tested with this release.
696 Noteworthy changes in release 4.6 (2011-03-15)
697 ==============================================
699 * Changes in behavior
700 * Print diagnostic information about changes in personality mode to
701 standard error instead of standard output.
704 * Implemented a new method of following clone, fork, and vfork
705 syscalls using the Linux kernel's explicit facilities for tracing
706 creation of threads and child processes.
707 * Implemented CLONE_PARENT and CLONE_UNTRACED flags handling.
708 * Implemented decoding of TLS syscalls on m68k.
709 * Implemented biarch support on powerpc64.
710 * Implemented biarch support for getrlimit() and setrlimit().
711 * Implemented decoding of struct ucred in getsockopt SO_PEERCRED.
712 * Implemented SOL_SCTP socket options decoding.
713 * Added HDIO_* ioctl names.
714 (Addresses Debian bug #450953).
715 * Added LOOP_* ioctl names.
716 * Updated lists of CLOCK_*, CLONE_*, MS_*, and SOL_* constants
717 to match Linux 2.6.37.
718 * Updated the list of IPPROTO_* constants to match netinet/in.h.
719 * Implemented decoding of HDIO_* and BLK* ioctls.
720 * Added MicroBlaze architecture support.
721 * Added new syscall entries to match Linux 2.6.37.
722 * Regenerated list of ioctl names from Linux 2.6.37.
723 * Enhanced signal notification decoding.
724 * Documented -C and -D options.
727 * Fixed fetching syscall arguments on m68k.
728 * Fixed an error when judging whether a process has children.
729 * Fixed get/set_robust_list syscall numbers for powerpc.
730 * Fixed a corner case in printing clone flags.
731 * Fixed cross-compiling issues.
732 * Fixed build issues on powerpc64, SH and SPARC.
733 * Fixed syscall flags of fstatat*, mmap, mmap2, fadvise64*, swapoff,
734 fgetxattr, flistxattr, fremovexattr, epoll_create, fallocate,
735 fanotify_init, and fanotify_mark syscalls.
736 * Fixed decoding of get[ug]id, gete[ug]id and setfs[ug]id return values.
737 * Fixed biarch support in IO dumping.
738 * Fixed raw exit_group decoding.
739 * Fixed decoding of file descriptors on 64-bit architectures.
740 * Fixed a corner case in waitpid handling.
741 (Addresses Red Hat bug #663547).
742 * Fixed stat64 decoding on mips
743 (Addresses Debian bug #599028).
744 * Fixed misleading italics in the manual page.
745 (Addresses Debian bug #589323).
747 Noteworthy changes in release 4.5.20 (2010-04-13)
748 =================================================
751 * Implemented decoding of new linux syscalls: inotify_init1, recvmmsg.
752 * Implemented basic decoding of new linux syscalls: preadv, pwritev,
753 rt_tgsigqueueinfo, perf_event_open.
754 * Enhanced decoding of recently added syscalls on non-x86 architectures
755 by replacing a bare decoder with elaborate parsers enabled earlier
757 * Implemented -C option to combine regular and -c output.
758 (Addresses Debian bug #466196)
759 * Enhanced decoding of mbind and mremap syscalls.
760 * Enhanced SOL_PACKET socket options decoding.
761 * Regenerated list of ioctl names from linux 2.6.33.
762 * Added TILE architecture support.
765 * Fixed build with Linux kernel headers 2.6.32-rc5+.
766 (Addresses Debian bug #560516 and Fedora bug #539044)
767 * Fixed build on mips.
768 * Fixed handling of Linux systems without struct statfs64.
769 * Fixed reporting signal mask by sigreturn on powerpc.
770 * Fixed potential stack buffer overflow in select decoder.
771 (Addresses Fedora bug #556678)
772 * Corrected msgsnd indirect ipccall decoding.
773 * Corrected decoding of 64bit syscalls.
774 (Addresses Debian bug #570603)
775 * Corrected getsockopt decoding on architectures where
776 sizeof(long) > sizeof(int).
777 (Addresses Debian bug #494844)
778 * Corrected decoding of epoll_pwait.
779 (Addresses Debian bug #513014)
780 * Corrected handling of killed threads.
782 Noteworthy changes in release 4.5.19 (2009-10-21)
783 =================================================
785 * Changes in behavior
786 * When command exits, strace now exits with the same exit status.
787 If command is terminated by a signal, strace terminates itself
788 with the same signal, so that strace can be used as a wrapper
789 process transparent to the invoking parent process.
790 When using -p option, the exit status of strace is zero unless
791 there was an unexpected error in doing the tracing.
792 (Addresses Fedora bug #105371 and Debian bug #37665)
795 * Implemented decoding of new Linux syscalls: accept4, dup3,
796 epoll_create1, eventfd2, inotify_init1, pipe2, signalfd4.
797 * Implemented decoding of socket type flags introduced in Linux 2.6.27.
798 * Implemented decoding of accept4 socketcall.
799 * Enhanced prctl decoding.
800 * Enhanced nanosleep decoding.
801 * Enhanced ptrace decoding.
802 * Enhanced futex decoding.
803 * Enhanced CAP_* decoding.
804 * Enhanced SIOCS* ioctls decoding.
805 * Enhanced fcntl F_* flags decoding.
806 * Enhanced semop/semtimedop decoding.
807 * Updated ARM architecture support.
808 * Added Blackfin architecture support.
809 * Added AVR32 architecture support.
810 * Added CRIS architecture support.
811 * Made strace detect when traced process suddenly disappeared.
814 * Fixed syscall numbers for tee and sync_file_range.
815 (Addresses Debian bug #503124)
816 * Fixed several bugs in strings decoder, including potential heap
818 (Addresses Fedora bugs #470529, #478324 and #511035)
819 * Marked sendfile(2) as a network syscall.
820 (Addresses Debian bug #509499)
821 * Fixed accept(2) decoding.
822 (Addresses Debian bug #507573)
823 * Fixed sigtimedwait(2) decoding.
824 * Fixed build on ARM EABI.
825 (Addresses Debian bugs #520084 and #535564, and Fedora bug #507576)
826 * Fixed display of 32-bit fcntl(F_SETLK) on 64-bit architectures.
827 (Addresses Red Hat bug #471169)
828 * Fixed display of 32-bit argv array on 64-bit architectures.
829 (Addresses Fedora bug #519480)
830 * Fixed display of 32-bit struct sigaction on 64-bit architectures.
831 * Fixed HPPA architecture support.
832 (Addresses Debian bugs #437928 and #546619)
837 * Support new Linux/PPC system call subpage_prot and PROT_SAO flag.
838 * In sigaction system call, display sa_flags value along with SIG_DFL/SIG_IGN.
843 * -F is now deprecated, -f has traced vfork too on Linux for a long time now.
844 * Print O_CLOEXEC, MSG_CMSG_CLOEXEC flag bits.
845 * Improved output for prctl system call on Linux.
846 * Improved support for Linux/ARM.
847 * SA_NOMASK is now spelled SA_NODEFER, and SA_ONESHOT is spelled SA_RESETHAND.
852 * Improved output for delete_module, futex, and mbind system calls on Linux.
853 * Improved output for SG_IO ioctls on Linux.
854 * Support new Linux system calls move_pages, utimensat, signalfd, timerfd,
855 eventfd, getcpu, epoll_pwait.
860 * Several biarch improvements.
861 * Improved output for adjtimex, sysctl, quotactl, mount, umount.
862 * Support new Linux system calls *at, inotify*, pselect6, ppoll and unshare.
867 * Accept numeric system calls in -e.
872 * Introduce "-e trace=desc".
877 * Better x86-64 support for IA32 processes.
878 * Update PowerPC system calls.
879 * Better printing for Linux aio system calls.
883 * Quick fix release for build issues.
884 * One fix for Linux/ARM system call table.
889 * Print fault address for SIGSEGV/SIGBUS signals when available.
894 * Improve socket ioctl printing.
895 * Update Linux/IA64 syscall list.
896 * Fix Linux/x86-64 syscall argument extraction for 32-bit processes.
897 * Improve mount flags printing.
898 * Support symbolic printing of x86_64 arch_prctl parameters.
903 * Update syscall tables for Alpha, ARM, HPPA.
904 * Support new Linux syscalls mbind, set_mempolicy, get_mempolicy, waitid.
905 * Support Linux syscalls fadvise64, fadvise64_64, and epoll_*.
906 * Improve ioctl command name matching.
907 * Print RTC_* ioctl structure contents.
908 * Support newer RLIMIT_* values.
909 * Print struct cmsghdr details in sendmsg.
914 * Print attribute values in *xattr system calls on Linux.
915 * Include pread and pwrite calls in -e read and -e write tracing.
916 * Update SO_* and IP_* value lists and add IPV6_* values for socket options.
917 * Print clock_t values symbolically in Linux clock_* system calls.
921 * Bug fixes, Linux ioctl updates.
922 * David Miller contributed support for Linux/SPARC64.
930 * Update Linux ioctl lists.
931 * Update PF_* and AF_* value lists.
932 * The 4.5.3 -p behavior for NPTL threads applies only under -f, and got fixed.
937 * On Linux using NPTL threads, -p will now attach to all threads in a process.
938 * Handle new mq_* system calls in Linux 2.6.6 and later.
943 * Report some new VM_* bit values on Linux.
944 * Better output for Linux sched_* system calls.
949 * Display multiple ioctl name matches on Linux.
953 * New port to AMD's x86-64 architecture. One strace binary can
954 handle both new x86-64 and old i386 processes.
955 * Fixed support for LFS64 calls.
956 * New switch -E to add/remove environment variables for the command.
957 * Merged s390/s390x port.
958 * Trace an unbounded number of processes.
959 * Handle numerous new system calls in Linux 2.5, and new threads semantics.
960 * Fixed bugs with attach/detach leaving things stopped.
961 * Fixed traced process seeing ECHILD despite live, traced children
962 in waitpid calls with WNOHANG.
963 * Stuart Menefy contributed a port to Linux/SH.
964 * Stephen Thomas contributed a port to Linux/SH64.
965 * Many other bug fixes.
969 * Fix Linux/ia64 support, looks like someone renamed a few things on us
970 * Fix the ioctl setup for Linux, turned out it did not really work.
971 Improve the ioctl extractor as well so we decode some more ones.
975 * compile fixes for Linux/mips
979 * Linux ia64 and hppa ports added
980 * The usual Linux syscall updates (includes 32bit uid/gid support),
981 * Linux ioctl list updated
982 * Support IPv6 scope ids
983 * FreeBSD/i386 port added
984 * UnixWare and Solaris updates
985 * Better support for tracing multithreaded processes in Linux
989 * Compiles on glibc2.0 systems again
990 * Linux/S390 port added
991 * The usual Linux syscall updates
992 * we can follow fork on arm now
996 * Linux/MIPS port added
997 * Lots of Linux updates again
998 * Improved IPv6 support
1004 * Compiles on glibc2.0 systems again
1008 * Get stat structure properly on Linux 64bit archs
1009 * Personalities work again
1010 * Compile correctly on SunOS again
1016 * Linux (ultra)sparc fixes
1023 * add support for more Linux architectures (powerpc, sparc, arm)
1024 * support lots more Linux syscalls
1025 * fix signal handling
1026 * add IPX and IPIP support
1027 * check stray syscall after execv
1028 * fix hanging children
1030 Changes in version 3.1
1031 ======================
1033 * Irix5 is supported
1034 * Linux 68k is supported
1035 * Linux alpha is supported
1036 * configure is upgraded to autoconf 2.x
1037 * using -f in combination with -e now works correctly
1038 * output can be piped to a program
1039 * tracing setuid programs works better
1040 * it is now reasonable to install strace setuid to root in some circumstances
1041 * new useful tracing names like file and process to trace whole
1042 classes of system calls, e.g. -efile traces all system calls that
1043 take a file name as an argument
1044 * IPC calls on SunOS 4.1.x are decoded
1045 * Linux program memory is reliably dereferenced
1046 * Linux decodes at least the name of all syscalls as of pre2.0.4
1047 * various cosmetic changes and bug fixes
1049 Changes from versions 2.x to version 3.0
1050 ========================================
1052 * filename arguments are neither abbreviated nor stringified
1053 * string arguments are now true C strings using octal instead of hex by default
1054 * preprocessor constants are never shortened (e.g. was RDONLY => now O_RDONLY)
1055 * by default the output for multiple processes now goes into one file
1056 * all structures, vectors, bitsets, etc. use consistent output formats
1057 * the -c option now means count calls, -i does what the old -c used to do
1059 New Features in version 3.0
1060 ===========================
1062 * non-ascii strings can be optionally printed entirely in hex
1063 * the output format is readable when multiple processes are generating output
1064 * exit values are printed in an alignment column
1065 * is is possible to suppress messages about attaching and detaching
1066 * various tracing features can be enabled on a per syscall/signal/desc basis
1067 * selective tracing of syscalls
1068 * selective printing of syscall structures
1069 * selective abbreviation of long structures on a per syscall basis
1070 * selective printing of raw syscall arguments and results
1071 * selective tracing of signals
1072 * selective dumping of all I/O read from file descriptors
1073 * selective dumping of all I/O written to file descriptors
1074 * optional counting of time, calls, and errors for each syscall
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