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 * Enhanced decoding of getsockopt and setsockopt syscalls for SOL_NETLINK
9 * Updated lists of MSG_* and SHM_* constants.
11 Noteworthy changes in release 4.20 (2017-11-13)
12 ===============================================
15 * Implemented decoding of NETLINK_NETFILTER netlink message types and flags.
16 * Implemented decoding of SECCOMP_GET_ACTION_AVAIL operation of seccomp
18 * Updated lists of ARPHRD_*, BPF_*, ETH_P_*, LOOP_*, MADV_*,
19 MEMBARRIER_CMD_*, MFD_*, SECCOMP_*, SO_*, SOL_*, TCP_*, and UFFD_FEATURE_*
21 * Added decoding of statx syscall on hppa.
22 * Updated lists of ioctl commands from Linux 4.14.
25 * Fixed powerpc personality support on powerpc64.
27 Noteworthy changes in release 4.19 (2017-09-05)
28 ===============================================
30 * Changes in behaviour
31 * Changed formatting of personality names on tile architecture in order
32 to make it in line with other multi-personality architectures.
33 * Changed field output order in struct v4l2_requestbuffers to improve in/out
35 * Changed handling of multiple signal= specifications in an injection
36 expression: multiple specification now leads to error instead of implicit
37 usage the last specification.
40 * Enhanced decoding of optlen argument of getsockopt syscall.
41 * Enhanced decoding of SO_LINGER option of getsockopt and setsockopt syscalls.
42 * Enhanced decoding of SO_PEERCRED option of getsockopt syscall.
43 * Enhanced decoding of IP_ADD_MEMBERSHIP, IP_DROP_MEMBERSHIP,
44 IPV6_ADD_MEMBERSHIP, IPV6_DROP_MEMBERSHIP, IPV6_JOIN_ANYCAST,
45 IPV6_LEAVE_ANYCAST, MCAST_JOIN_GROUP, and MCAST_LEAVE_GROUP options
46 of setsockopt syscall.
47 * Enhanced decoding of KEYCTL_DH_COMPUTE operation of keyctl syscall
48 (KDF parameters decoding).
49 * Implemented decoding of KEYCTL_RESTRICT_KEYRING operation of keyctl syscall.
50 * Enhanced decoding of UFFDIO_API ioctl command.
51 * Enhanced decoding of BPF_PROG_LOAD, BPF_MAP_CREATE, BPF_MAP_LOOKUP_ELEM,
52 and BPF_MAP_GET_NEXT_KEY commands of bpf syscall.
53 * Implemented decoding of linux socket filter programs specified
54 for SO_ATTACH_FILTER and SO_ATTACH_REUSEPORT_CBPF socket options.
55 * Implemented decoding of inet_diag_req_v2, inet_diag_req_compat,
56 packet_diag_msg, and smc_diag_msg netlink attributes of NETLINK_SOCK_DIAG.
57 * Implemented NETLINK_SELINUX protocol specific decoding.
58 * Implemented decoding of netlink message ack flags.
59 * Implemented decoding of nlmsgerr netlink attributes.
60 * Implemented basic protocol specific decoding of NETLINK_CRYPTO.
61 * Implemented decoding of crypto_user_alg netlink attributes
63 * Implemented basic protocol specific decoding of addr, addrlabel, dcb, link,
64 mdb, neigh, neightbl, netconf, nsid, route, rule, tc, and tca messages
66 * Implemented decoding of NETLINK_KOBJECT_UEVENT messages.
67 * Improved handling of unexpected tracees (the ones that cloned with
68 CLONE_PARENT/CLONE_PTRACE or called PTRACE_TRACEME on themselves): they
69 are now PTRACE_DETACH'ed instead of PTRACE_CONT'ed.
70 * Updated lists of BPF_*, KEY_*, RWF_*, SCM_*, SO_*, and *_MAGIC constants.
71 * Added decoding of arch_prctl syscall on x86.
72 * Added decoding of seccomp, bpf, userfaultfd, membarrier, mlock2,
73 copy_file_range, preadv2, pwritev2, and statx on alpha.
74 * Added decoding of statx syscall on microblaze.
75 * Added decoding of s390_guarded_storage syscall on s390.
76 * Updated lists of ioctl commands from Linux 4.13.
77 * Enhanced manual page.
80 * Fixed printing of group_req structure on non-native personalities.
81 * Fixed output formatting of blkpg_ioctl_arg, dm_name_list, and iocb
83 * Fixed formatting of nul-terminated strings which have kernel-imposed size
85 * Fixed printing of paths that hit PATM_MAX limit in order to match kernel's
87 * Fixed build warnings on Android mips64.
88 * Fixed unused function "is_negated_errno" build warning when built
90 * Fixed syscall number and arguments retrieval behaviour on sparc64 and
91 mips o32 after prctl(PR_SET_DUMPABLE, 0) makes PTRACE_PEEKTEXT impossible
92 to use if Linux kernel has commit v4.10-rc1~114^2~2.
93 * Fixed path tracing for execveat, symlink, symlinkat, inotify_add_watch,
94 and inotify_init syscalls.
95 * Fixed personality switch printing on sparc64 and risc-v.
97 Noteworthy changes in release 4.18 (2017-07-05)
98 ===============================================
101 * Implemented decoding of SCM_TIMESTAMP* control messages.
102 * Implemented decoding of netlink NLMSG_DONE messages.
103 * Implemented decoding of netlink generic nlmsg_type and nlmsg_flags.
104 * Implemented decoding of NETLINK_AUDIT, NETLINK_NETFILTER, NETLINK_ROUTE,
105 NETLINK_SELINUX, NETLINK_SOCK_DIAG, and NETLINK_XFRM message types.
106 * Implemented decoding of NETLINK_GENERIC protocol families.
107 * Implemented basic protocol specific decoding of AF_INET, AF_INET6,
108 AF_NETLINK, AF_PACKET, AF_SMC, and AF_UNIX messages of NETLINK_SOCK_DIAG.
109 * Implemented basic decoding of netlink attributes.
110 * Implemented basic protocol specific decoding of AF_INET, AF_NETLINK,
111 AF_PACKET, AF_SMC, and AF_UNIX netlink attributes of NETLINK_SOCK_DIAG.
112 * Implemented decoding of inet_diag_msg, netlink_diag_msg, and unix_diag_msg
113 netlink attributes of NETLINK_SOCK_DIAG.
114 * Updated lists of ARPHRD_*, KEYCTL_*, NDIAG_SHOW_*, RTM_*, SCM_*, SCTP_*,
115 SO_*, V4L2_*, and prctl ARCH_* constants.
116 * Updated lists of ioctl commands from Linux 4.12.
119 * In interactive mode (-I2), those signals that were blocked at startup
120 will remain blocked for the whole period of strace execution.
121 * strace no longer resets SIGCHLD handler in tracees to the default action.
122 * When traced command is terminated by a blocked signal, strace unblocks
123 that signal to ensure its own termination with the same signal.
124 * Fixed corner cases in decoding of old sigaction syscall.
125 * Fixed build with old kernel headers on mips.
126 * Fixed build on aarch64 and tile with glibc >= 2.26.
127 * Fixed build on arc and nios2.
129 Noteworthy changes in release 4.17 (2017-05-24)
130 ===============================================
132 * Changes in command line syntax
133 * Syscall classes specified in -e trace= option now have % prefix (like
134 -e trace=%process). Old style class names without leading % are still
135 supported, but considered deprecated now.
138 * Optimized syscall filtering.
139 * Improved representation of timestamps.
140 * Enhanced decoding of sched_setattr syscall.
141 * Added -e trace=%stat option for tracing variants of stat syscall.
142 * Added -e trace=%lstat option for tracing variants of lstat syscall.
143 * Added -e trace=%fstat option for tracing variants of fstat and fstatat
145 * Added -e trace=%%stat option for tracing syscalls used for querying file
146 status information (stat, lstat, fstat, fstatat, statx, and their
148 * Added -e trace=%statfs option for tracing statfs, statfs64 and statvfs
150 * Added -e trace=%fstatfs option for tracing fstatfs, fstatfs64 and fstatvfs
152 * Added -e trace=%%statfs option for tracing syscalls used for querying file
153 system statistics information (statfs-like, fstatfs-like and ustat).
154 * Added -e trace=/regex option for filtering syscalls using regular
156 * Added support for prepending of question mark before syscall qualification
157 in -e trace expressions in order to suppress error in case no syscalls
158 matched the provided qualification.
159 * Implemented decoding of signal mask in rt_sigreturn syscall on alpha, arc,
160 arm, avr32, bfin, cris, hppa, m68k, metag, microblaze, mips, nios2, or1k,
161 powerpc, powerpc64, riscv, sh, sh64, sparc, sparc64, tile, x86, and xtensa
163 * Implemented decoding of statx syscall.
164 * Implemented decoding of NS_* ioctl commands.
165 * Implemented decoding of the remaining V4L2_BUF_TYPE_* types.
166 * Implemented decoding of VIDIOC_[SG]_TUNER ioctl commands.
167 * Implemented decoding of NLMSG_ERROR netlink messages.
168 * Improved decoding of BPF_PROG_ATTACH command of bpf syscall.
169 * Improved decoding of misplaced parts in DM_* ioctl commands.
170 * Updated lists of ioctl commands from Linux 4.11.
173 * Fixed decoding of flags argument of preadv2 and pwritev2 syscalls on x32.
174 * Fixed the number of arguments and tracing flags of alpha specific syscalls.
175 * Fixed decoding of old sigsuspend syscall on alpha, cris, mips, powerpc,
176 powerpc64, sh, sh64, sparc, and sparc64.
177 * Fixed decoding of sgetmask and ssetmask syscalls on 64-bit architectures.
178 * Fixed decoding of netlink messages received within struct msghdr.
179 * Worked around a bug in miscompiled aarch64 kernels leading to the 3rd
180 argument of sched_getattr syscall being not quite 32-bit.
181 * Fixed corner cases of printing inaccessible times argument of utimes
182 and futimesat syscalls.
184 Noteworthy changes in release 4.16 (2017-02-14)
185 ===============================================
188 * Implemented syscall return value injection (-e inject=SET:retval= option).
189 * Implemented signal injection (-e inject=SET:signal= option).
190 * Implemented decoding of SUID_DUMP_* constants in PR_[GS]ET_DUMPABLE.
191 * Implemented decoding of all SG_* ioctl commands.
192 * Implemented decoding of ustat syscall.
193 * Implemented decoding of BPF_OBJ_PIN, BPF_OBJ_GET, BPF_PROG_ATTACH,
194 and BPF_PROG_DETACH commands of bpf syscall.
195 * Enhanced decoding of sg_io_hdr and sg_io_v4 structures.
196 * Enhanced decoding of get_robust_list, getrandom, io_submit, set_robust_list
198 * Enhanced decoding of entities of kernel long type on x32 and mips n32 ABIs.
199 * Updated lists of IP_*, IPV6_*, and LOOP_* constants.
200 * Updated lists of ioctl commands from Linux 4.10.
201 * Added decoding of recently added syscalls on avr32, microblaze, ppc,
205 * Fixed pathmatch of oldselect syscall on 64-bit architectures.
206 * Fixed decoding of mmap2 syscall on s390 when arguments are not available.
207 * Fixed decoding of kexec_file_load, mprotect, pkey_mprotect, prctl, preadv*,
208 and pwritev* syscalls on x32.
209 * Fixed printing of string arguments of getxattr and setxattr syscalls
210 when -s option is used to limit the printed string size.
211 * Fixed decoding of ifconf, ifreq, and loop_info structures on non-native
213 * Fixed decoding of SG_* and LOOP_* ioctl commands.
214 * Fixed build on mips with musl libc.
215 * Fixed cross-building of ioctlsort.
216 * Applied minor formatting fixes to the manual page.
218 Noteworthy changes in release 4.15 (2016-12-14)
219 ===============================================
221 * Changes in behavior
222 * Time stamps are now printed according to ISO 8601.
223 * Changed output format of val3 parameter of futex FUTEX_WAKE_OP operation.
224 * The last argument of mincore, sched_getaffinity, and sched_setaffinity
225 syscalls is now formatted as an array.
228 * Implemented syscall fault injection (-e fault=... option).
229 * Implemented decoding of DM_* ioctl commands.
230 * Implemented decoding of attr parameter of perf_event_open syscall.
231 * Implemented decoding of pkey_alloc, pkey_free, and pkey_mprotect syscalls.
232 * Implemented dumping of mq_timedsend and mq_timedreceive syscalls.
233 * Implemented decoding of PR_SET_FP_MODE and PR_GET_FP_MODE operations
235 * Implemented PTRACE_GETREGS API support on m68k.
236 * Updated lists of ARCH_*, BPF_*, BTRFS_*, FALLOC_*, MS_*, *_MAGIC,
237 and V4L2_* constants.
238 * Updated lists of ioctl commands from Linux 4.9.
239 * Added decoding of recently added syscalls on arc, x32, and xtensa.
240 * Enhanced manual page.
243 * Fixed corner cases in decoding of exit, exit_group, futimesat, getgroups,
244 getresuid, init_module, inotify_init1, kcmp, kexec_load, lookup_dcookie,
245 mq_getsetattr, mq_notify, mq_open, mq_timedreceive, mq_timedsend,
246 name_to_handle_at, prctl, process_vm_readv, process_vm_writev, setfsuid,
247 setgroups, setns, unshare, and utimes syscalls.
248 * Fixed handling of verbose flag in printing of controls array
249 of struct v4l2_ext_controls.
250 * Fixed omission of field names in the output of capability, sigaction,
251 sigevent, statfs, timespec, timeval, and utimbuf structures.
252 * Fixed printing of unknown syscalls in siginfo structure.
253 * Fixed decoding of ioctl constants on m68k.
254 * Fixed cris architecture support.
255 * Fixed cross build when host compiler does not support the same
256 set of warning flags as the cross compiler.
257 * Fixed build on SLE10 and SLE11.
259 Noteworthy changes in release 4.14 (2016-10-04)
260 ===============================================
262 * Changes in behavior
263 * When using -p option without a command and no processes has been attached,
264 strace exits with exit status 1.
267 * Added printing of the mode argument of open and openat syscalls
268 when O_TMPFILE flag is set. (Addresses Fedora bug #1377846).
269 * Enhanced -e abbrev=set, -e raw=set, and -e verbose=set.
270 * Enhanced decoding of futex, keyctl, quotactl, timerfd_settime,
271 and aio family syscalls.
272 * Implemented fetching of the 7th subcall argument on mips o32.
273 * Updated lists of BPF_*, ETH_P_*, KEXEC_ARCH_*, SCTP_*, TCP_*, and *_MAGIC
275 * Updated lists of ioctl commands from Linux 4.8.
276 * Added decoding of new syscalls on sh and sh64.
277 * Added RISC-V architecture support.
280 * Marked io_setup and io_destroy as memory mapping related syscalls.
281 * Fixed leakage of placeholder descriptors to tracees.
282 * Fixed printing of mode_t, umode_t, and umask types.
283 * Fixed decoding of iovec arrays without a limit on total data size.
284 * Fixed decoding of fadvise64, fallocate, futex, keyctl, quotactl, readahead,
285 and ipc family syscalls.
286 * Fixed decoding of invalid syscalls mapped to indirect subcalls.
287 * Fixed decoding of struct btrfs_ioctl_vol_args_v2 on non-native
289 * Fixed decoding of PTRACE_DETACH on sparc and sparc64.
290 * Fixed decoding of struct stat64 on sparc64.
291 * Fixed decoding of uid and gid-related syscalls on sparc64.
292 * Fixed decoding of the forth argument of semctl syscall on sparc64.
293 * Fixed values of tty ioctl constants on sparc64.
294 * Fixed sparc personality support on sparc64.
296 Noteworthy changes in release 4.13 (2016-07-26)
297 ===============================================
300 * Implemented a general netlink socket parser.
301 * Enhanced decoding of socket addresses.
302 * Enhanced decoding of cmsghdr, msghdr, and mmsghdr structures.
303 * Enhanced decoding of accept, accept4, bind, getpeername, getsockname,
304 ipc, recvfrom, recvmsg, recvmmsg, sendto, sendmmsg, and socketcall syscalls.
305 * Updated lists of AF_*, BPF_MAP_TYPE_*, KEY_*, KEYCTL_*, RWF_*, SS_*,
306 and *_MAGIC constants.
307 * Updated lists of ioctl commands from Linux 4.7.
310 * Fixed decoding of pid_t argument of prlimit64 syscall.
311 * Fixed sign extension issues in the parser of struct rusage.
312 * Fixed race condition in decoding of timeout argument of recvmmsg and
313 rt_sigtimedwait syscalls.
314 * Fixed build with fresh linux kernel headers.
316 Noteworthy changes in release 4.12 (2016-05-31)
317 ===============================================
320 * Implemented simultaneous use of -p option and tracing of a command.
321 (addresses Debian bug #549942).
322 * Implemented caching of netlink conversations to reduce amount of time
323 spent in decoding socket details in -yy mode.
324 * Implemented -yy mode decoding of protocol:portid pairs associated with
325 netlink socket descriptors.
326 * Implemented decoding of copy_file_range, preadv2, and pwritev2 syscalls.
327 * Implemented dumping of preadv, preadv2, pwritev, pwritev2, and vmsplice
329 * Implemented decoding of BTRFS_* and UFFDIO_* ioctl commands.
330 * Enhanced decoding of BLK*, EVIOC*, RTC_*, and VIDIOC_* ioctl commands.
331 * Enhanced decoding of fstatfs, fstatfs64, get_mempolicy, getdents,
332 getdents64, getgroups, getpriority, kill, mbind, migrate_pages, mknod,
333 mknodat, personality, poll, ppoll, quotactl, rt_sigpending,
334 rt_sigqueueinfo, rt_sigtimedwait, rt_tgsigqueueinfo, sched_getaffinity,
335 sched_setaffinity, seccomp, set_mempolicy, setgroups, setpriority, statfs,
336 statfs64, tgkill, waitid, and xattr family syscalls.
337 * Enhanced decoding of getxpid, getxuid, and getxgid syscalls on alpha.
338 * Enhanced decoding of pipe syscall on alpha, ia64, mips, sh, and sparc.
339 * Added decoding of bind, listen, and setsockopt direct syscalls on sparc.
340 * Added decoding of osf_statfs64 and osf_fstatfs64 syscalls on alpha.
341 * Added decoding of fadvise64 and fadvise64_64 on s390.
342 * Updated lists of AF_*, BPF_MAP_TYPE_*, CLONE_*, EPOLL*, IPV6_*, MADV_*,
343 MSG_*, PTRACE_*, SEGV_*, SO_*, SOL_*, *_MAGIC, and quotactl constants.
344 * Updated lists of ioctl commands from Linux 4.6.
347 * Fixed build on arc, metag, nios2, or1k, and tile architectures.
348 * Fixed decoding of 32-bit times syscall return value on 64-bit architectures.
349 * Fixed decoding of mlock2 syscall on sparc.
350 * Fixed decoding of osf_shmat syscall on alpha.
351 * Fixed decoding of syscalls unknown to the kernel on s390/s390x.
352 (addresses Debian bug #485979 and Fedora bug #1298294).
353 * Fixed decoding of preadv syscall in case of short read.
354 * Fixed decoding and dumping of readv syscall in case of short read.
355 * Fixed dumping of recvmsg and recvmmsg syscalls in case of short read.
356 * Fixed decoding of mincore syscall's last argument.
357 * Fixed remaining errors in mapping between syscall numbers and numbers
358 of syscall arguments.
359 * Applied various fixes to strace-graph script.
361 Noteworthy changes in release 4.11 (2015-12-21)
362 ===============================================
364 * Changes in behavior
365 * Some syscalls have different names depending on architecture and
366 personality. In these cases, syscall filtering and printing now
367 consistently uses the names that match corresponding __NR_* kernel
368 macros of the tracee's architecture and personality.
369 * Added strace prefix to all diagnostic messages.
372 * Enhanced and extended test suite.
373 * Implemented reliable tracing of processes whose personality differs
374 from the personality of strace, fixed decoding of 32-bit personality
375 syscalls on 64-bit architectures.
376 * When some data referenced by syscall arguments is irrelevant or cannot
377 be read from tracee's memory, strace now prints its address consistently.
378 * When a syscall is restarted using restart_syscall mechanism, strace now
379 shows the syscall name on architectures that expose this information.
380 * Print values returned by epoll_create1, eventfd, eventfd2, fanotify_init,
381 inotify_init1, perf_event_open, pipe, pipe2, signalfd, signalfd4, socket,
382 socketpair, timerfd, and timerfd_create syscalls, as well as F_DUPFD and
383 F_DUPFD_CLOEXEC fcntl commands, as file descriptors.
384 * Optimized decoding of indirect socket syscalls.
385 * Implemented decoding of nanoseconds along with seconds in stat family
386 syscalls (addresses Fedora bug #1251176).
387 * Implemented decoding of struct statfs.f_flags in statfs syscall.
388 * Implemented decoding of siginfo_t.si_syscall and siginfo_t.si_arch
390 * Implemented decoding of indirect syscall on mips o32.
391 * Implemented decoding of IPPROTO_IP control messages.
392 * Implemented decoding of setsockopt syscall multicast arguments.
393 * Enhanced decoding of struct sigevent.
394 * Enhanced decoding of block, loop, mtd, ptp, rtc, SG_IO, socket, tty,
395 and v4l2 ioctl syscall arguments.
396 * Enhanced decoding of epoll_create, fcntl, fcntl64, futex, getdents,
397 getdents64, getsockopt, io_*, mount, msgctl, prctl, quotactl, recvfrom,
398 sendfile, setsockopt, and shmctl syscalls.
399 * Implemented decoding of bpf, execveat, ioperm, iopl, kcmp, kexec_file_load,
400 lookup_dcookie, membarrier, memfd_create, mlock2, name_to_handle_at,
401 open_by_handle_at, sched_getattr, sched_setattr, and userfaultfd syscalls.
402 * Updated lists of AF_*, EPOLL_*, FALLOC_FL_*, F_*, INPUT_PROP_*, IPPROTO_*,
403 IPV6_*, IP_*, KEY_*, LOCK_*, MNT_*, MS_*, PACKET_*, PERF_FLAG_*, PF_*,
404 PR_*, PTRACE_O_*, RENAME_*, SCTP_*, SECBIT_*, SO_*, TCP_*, and siginfo_t
406 * Added Nios II architecture support.
407 * Added new syscall entries to match Linux 4.4.
410 * Fixed potential short read of strings from tracee's memory.
411 * Fixed -qq option in conjunction with -o option.
412 * Fixed filtering of <unavailable> syscalls.
413 * Fixed decoding of ioctl syscall command on aarch64 and 32-bit architectures
414 with 64-bit aligned structures.
415 * Fixed decoding of eventfd2, epoll_create1, signalfd4, and sync_file_range2
416 syscall flags arguments.
417 * Fixed decoding of 4th argument of clock_nanosleep syscall.
418 * Fixed decoding of getpagesize syscall on m68k.
419 * Fixed decoding of getrandom and seccomp syscalls on aarch64.
420 * Fixed decoding of timezone argument of gettimeofday and settimeofday
422 * Fixed decoding of offset argument of mmap2 syscall on arm, sparc,
424 * Fixed decoding of pipe syscall on alpha and mips.
425 * Fixed decoding of pipe2 syscall on ia64, sh, sparc, and sparc64.
426 * Fixed decoding of signal mask argument of pselect6 syscall on x32.
427 * Fixed decoding of signal mask of rt_sigreturn syscall on aarch64, m68k,
429 * Fixed decoding of 4th argument of semctl indirect syscall.
430 * Fixed decoding of sa_restorer and sa_mask of sigaction syscall on m68k.
431 * Fixed decoding of statfs64 and fstatfs64 syscalls on arm eabi.
432 * Fixed decoding of struct dirent on x32.
433 * Fixed decoding of times syscall return value on mips n32 and x32.
434 * Fixed decoding of path argument of umount2 syscall
435 (addresses Debian bug #785050).
436 * Worked around a kernel bug in tracing privileged executables.
437 * Fixed various errors in mapping between syscall numbers and associated
438 information like the number of syscall arguments, the name of syscall,
441 Noteworthy changes in release 4.10 (2015-03-06)
442 ===============================================
445 * Added -yy option to print protocol and address information associated with
447 * Extended "-e read=set" and "-e write=set" options to cover sendmsg,
448 recvmsg, sendmmsg, and recvmmsg syscalls.
449 * Implemented full 32-bit decoding of ioctl commands
450 (addresses Debian bug #692913 and Fedora bug #902788).
451 * Implemented PTRACE_GETREGS API support on ia64.
452 * Implemented PTRACE_GETREGS API support on mips.
453 * Implemented PTRACE_GETREGSET API support on s390/s390x.
454 * Implemented decoding of getrandom and seccomp syscalls.
455 * Implemented full decoding of 64-bit capability sets.
456 * Implemented decoding of all prctl commands.
457 * Implemented decoding of parametrized ioctl commands.
458 * Implemented decoding of evdev ioctl commands.
459 * Implemented decoding of v4l ioctl commands.
460 * Implemented decoding of SG_IO v4 ioctl commands.
461 * Implemented decoding of FIFREEZE/FITHAW/FITRIM ioctl commands.
462 * Implemented decoding of FALLOC_FL_* fallocate flags.
463 * Implemented decoding of rt_sigreturn signal mask on aarch64,
465 * Enhanced socket decoder to support bluetooth sockets.
466 * Enhanced decoding of unlisted ioctl commands.
467 * Enhanced decoding of getsockopt and setsockopt syscall.
468 * Enhanced decoding of sysinfo syscall.
469 * Enhanced decoding of struct cmsghdr.
470 * Enhanced decoding of wait status.
471 * Enhanced aio support on non-x86 architectures by using external libaio.h.
472 * Added O_TMPFILE to the list of recognized open mode flags.
473 * Updated the list of filesystem type constants that is used in decoding
474 statfs family syscalls.
475 * Updated lists of CAP_*, PR_*, PTRACE_*, SCHED_*, SO_*, SOL_*, SWAP_FLAG_*,
477 * Updated lists of signal constants from Linux 3.19.
478 * Updated lists of errno constants from Linux 3.19.
479 * Updated lists of ioctl commands from Linux 3.9.
480 * Added new syscall entries to match Linux 3.19.
483 * Fixed various errors in mapping between syscall numbers and associated
484 information like the number of syscall arguments, the name of syscall,
486 * Fixed quoting issues in printing descriptors, filenames, network interface
487 names, struct utsname members, device/volume names of BLK* ioctl commands.
488 * Fixed uid_t/git_t decoding.
489 * Fixed potential out-of-bounds read issues in getdents/getdents64 decoders.
490 * Fixed potential open flags truncation on some architectures.
491 * Fixed decoding of struct ifreq.ifr_name.
492 * Fixed decoding of SIOCSIFNAME ioctl command.
493 * Fixed decoding of RENAME_* renameat2 flags.
494 * Fixed decoding of UTIME_NOW/UTIME_OMIT timeval structures.
495 * Fixed decoding of indirect ipc subcalls on some architectures.
496 * Fixed decoding of fanotify_mark syscall on 32-bit architectures.
497 * Fixed decoding of 32-bit stat structures on 64-bit architectures.
498 * Fixed decoding of 32-bit struct cmsghdr on 64-bit architectures.
499 * Fixed decoding of 32-bit preadv/pwritev offset on 64-bit architectures.
500 * Fixed decoding of sigreturn/rt_sigreturn signal mask on ia64, ppc, ppc64,
501 sparc, sparc64, mips, and s390.
502 * Fixed instruction pointer output (-i option) on architectures that support
503 several personalities.
504 * Fixed behaviour of "-e read=set" and "-e write=set" when read and write
506 * Fixed build on systems where struct sigaction has no sa_restorer member.
507 * Fixed build with uclibc and musl libc.
510 * Linux kernel >= 2.5.46 is required.
511 Older versions without a decent PTRACE_SETOPTIONS support will not work.
512 * On mips, linux kernel >= 2.6.15 is required.
513 Older versions without a decent PTRACE_GETREGS support will not work.
514 * On s390 and s390x, linux kernel >= 2.6.27 is required.
515 Older versions without a decent PTRACE_GETREGSET support will not work.
517 Noteworthy changes in release 4.9 (2014-08-15)
518 ==============================================
520 * Changes in behavior
521 * Disabled OABI support on ARM EABI systems by default,
522 added --enable-arm-oabi option to enable it at configure time.
525 * Added experimental -k option to print stack trace after each traced syscall.
526 * Added -w option to produce stats on syscall latency.
527 (addresses Debian bug #457497).
528 * Added ARC architecture support.
529 * Added PTRACE_GETREGS API support on PowerPC.
530 * Enhanced Bionic libc and musl libc support.
531 * Enhanced tracing of x86 personality processes on x86_64 and x32.
532 * Enhanced tracing of ARM personality processes on AArch64.
533 * Enhanced 32/64bit personality detection on PowerPC.
534 * Implemented decoding of add_key, ioprio_get, ioprio_set, kexec_load, keyctl,
535 renameat2, and request_key syscalls.
536 * Robustified decoding of select, pselect, and io_submit syscalls.
537 * Enhanced decoding of delete_module, fanotify_init, fanotify_mark, fcntl,
538 setdomainname, sethostname, setns, and sync_file_range syscalls.
539 * Enhanced decoding of signal bitmasks.
540 * Enhanced decoding of file descriptors.
541 * Enhanced siginfo_t decoding.
542 * Enhanced PF_NETLINK decoding.
543 * Updated CLOCK_* constants
544 (addresses Fedora bug #1088455).
545 * Added new syscall entries to match Linux 3.16.
548 * Added shmat and shmdt to the set of memory mapping related syscalls.
549 * Fixed detaching from stopped processes.
550 * Fixed fanotify_mark decoding on 32bit architectures.
551 * Fixed offset decoding in preadv and pwritev syscalls.
552 * Fixed select decoding for glibc in _FORTIFY_SOURCE mode.
553 * Fixed decoding of epoll_ctl syscall with EPOLL_CTL_DEL argument.
554 * Fixed build when <sys/ptrace.h> and <linux/ptrace.h> conflict
555 (addresses Fedora bug #993384).
556 * Miscellaneous corrections in the manual page.
557 (Addresses Debian bug #725987).
559 Noteworthy changes in release 4.8 (2013-06-03)
560 ==============================================
562 * Changes in behavior
563 * In case of normal strace termination, when the trace output is
564 redirected to a pipe, strace now closes it and waits for the pipe
565 process termination before exit.
568 * Implemented tracing using PTRACE_SEIZE API (when available).
569 * Implemented more reliable PTRACE_GETREGSET-based process personality
570 detection on x86-64 and x32 (when available).
571 * Added -e trace=memory option for tracing memory mapping related syscalls.
572 * Documented -b option.
573 * Allowed exit status messages to be suppressed by giving -q option twice.
574 * Added AArch64 architecture support
575 (addresses Debian bug #693074 and Fedora bug #969858).
576 * Added support for OpenRISC 1000, Meta, and Xtensa architectures.
577 * Added tilegx personality support for Tile.
578 * Enhanced support of NOMMU architectures.
579 * Enhanced decoding of getdents, mmap, perf_event_open, ptrace, and
581 * Added new syscall entries to match Linux 3.9.
582 * Regenerated the list of common ioctl names from Linux 3.9.
583 * Updated the list of errno constants.
584 * Updated lists of AF_*, MADV_*, MAP_*, MSG_*, MS_*, PF_*, PR_*,
585 PTRACE_O_*, and TCP_* constants.
586 * Implemented decoding of UBI ioctls.
587 * Removed redundant "*32" ioctl names.
590 * Fixed ERESTARTNOINTR leaking to userspace on ancient kernels
591 (addresses Fedora bug #659382).
592 * Fixed kernel release string parsing
593 (addresses Debian bug #702309).
594 * Fixed decoding of *xattr syscalls
595 (addresses Fedora bug #885233).
596 * Fixed handling of files with 64-bit inode numbers by 32-bit strace
597 (addresses Fedora bug #912790).
598 * Fixed tracing forks on SPARC.
599 * Fixed decoding of fadvise64, fallocate, ftruncate64, io_submit, pread,
600 preadv, pwrite, pwritev, readahead, sigaltstack, sync_file_range, sysctl,
601 and truncate64 syscalls.
602 * Fixed categories of multiple syscalls on most of supported architectures.
603 * Fixed decoding of non-native 32-bit personality recv[m]msg syscalls.
604 * Fixed decoding of multiple 32-bit personality syscalls on x32.
605 * Fixed decoding of long long syscall arguments on ARM, MIPS/o32, PowerPC,
606 S390x, and Tile architectures.
607 * Fixed semtimedop decoding on S390x.
608 * Fixed sram_alloc decoding on Blackfin.
609 * Fixed build when process_vm_readv is a stab.
610 * Fixed build with older versions of libaio.h.
612 Noteworthy changes in release 4.7 (2012-05-02)
613 ==============================================
615 * Changes in behavior
616 * strace no longer suspends waitpid until there is a child
617 for waitpid'ing process to collect status from.
618 * strace no longer detaches from a tracee which is supposed
620 * strace now issues a new message: "+++ exited with EXITCODE +++"
621 which shows exact moment strace got exit notification,
622 analogous to existing "+++ killed by SIG +++" message.
625 * Added x32 personality support (x86_64 architecture).
626 * Added -y and -P options to print file descriptor paths and
627 filter by those paths.
628 * Added -I option to control strace interactivity.
629 * Allowed -p option to take comma or whitespace-separated list of PIDs.
630 * Added strace_log_merge script helper to merge timestamped "strace -ff"
632 * Implemented decoding of clock_adjtime, get_robust_list, migrate_pages,
633 preadv, prlimit64, process_vm_readv, process_vm_writev, pwritev,
634 recvmmsg, recvmsg, rt_tgsigqueueinfo, sendmmsg, setns, set_robust_list,
635 sched_rr_get_interval, splice, syslog, tee and vmsplice syscalls.
636 * Enhanced decoding of capget, capset, getrlimit, flistxattr, io_submit,
637 listxattr, setrlimit and swapon syscalls.
638 * Implemented decoding of loop and mtd ioctls.
639 * Added syscall entries for new linux syscalls.
640 * Added syscall entries for direct socket system calls on powerpc.
641 * Updated the list of errno constants.
642 * Updated lists of MSG_*, STA_*, and TCP_* constants.
643 * Regenerated the list of ioctl names from Linux 3.3.
644 * Enhanced switching between processes with different personalities.
645 * Enhanced signals reporting by using short signal names.
646 * Made ERESTART* messages more descriptive.
647 * Made parsing of numbers from strings more robust.
648 * Added support for compat_statfs64 and statfs64.f_flags.
649 * Changed read of data blocks to use single process_vm_readv syscall
650 (when available) instead of several PTRACE_PEEKDATA operations.
651 * Changed read of registers on x86 and x86-64 to use single PTRACE_GETREGS
652 operation instead of several PTRACE_PEEKUSER operations.
653 * Applied various optimizations to make strace work faster.
656 * Implemented proper handling of real SIGTRAPs on kernels supporting
657 PTRACE_O_TRACESYSGOOD.
658 (Addresses Fedora bug #162774).
659 * Fixed sockaddr_un.sun_path name in decoded output.
660 (Addresses Debian bug #554946).
661 * Fixed to avoid potential core file clobbering on exit.
662 (Addresses Debian bug #656398).
663 * Fixed a typo in documentation.
664 (Addresses Debian bug #653309).
665 * Fixed decoding of timer id returned by timer_create.
666 * Fixed epoll_create1, epoll_wait and epoll_pwait decoding.
667 * Fixed *at syscalls flags decoding.
668 * Fixed ARM EABI 64-bit syscall's arguments decoding.
669 * Fixed semtimedop decoding on s390.
670 * Fixed osf_sigprocmask decoding on alpha.
671 * Fixed ipc and socket subcall decoding on several architectures.
672 * Corrected syscall entries for epoll_pwait, epoll_create, epoll_ctl,
673 epoll_wait, mincore, mlockall, prctl, reboot, sendfile, sendfile64,
674 sendmsg, sgetmask, ssetmask, swapon, tgkill and tkill syscalls.
675 * Corrected io_* syscall entries on ARM.
676 * Fixed PID prefix printing in "strace -oLOG -ff -p1 -p2 -p3" case.
677 * Fixed logging of unfinished lines in "strace -oLOG -ff" case.
678 * Fixed build when libaio-devel is not available.
679 * Fixed configure checks for PTRACE_* constants.
680 * Fixed compilation warnings remained on several architectures.
683 * Removed all non-Linux code. After years of neglect, that dead code
684 just hampered further strace development.
685 * Linux kernel >= 2.6.18 is recommended. Older versions might still
686 work but they haven't been thoroughly tested with this release.
688 Noteworthy changes in release 4.6 (2011-03-15)
689 ==============================================
691 * Changes in behavior
692 * Print diagnostic information about changes in personality mode to
693 standard error instead of standard output.
696 * Implemented a new method of following clone, fork, and vfork
697 syscalls using the Linux kernel's explicit facilities for tracing
698 creation of threads and child processes.
699 * Implemented CLONE_PARENT and CLONE_UNTRACED flags handling.
700 * Implemented decoding of TLS syscalls on m68k.
701 * Implemented biarch support on powerpc64.
702 * Implemented biarch support for getrlimit() and setrlimit().
703 * Implemented decoding of struct ucred in getsockopt SO_PEERCRED.
704 * Implemented SOL_SCTP socket options decoding.
705 * Added HDIO_* ioctl names.
706 (Addresses Debian bug #450953).
707 * Added LOOP_* ioctl names.
708 * Updated lists of CLOCK_*, CLONE_*, MS_*, and SOL_* constants
709 to match Linux 2.6.37.
710 * Updated the list of IPPROTO_* constants to match netinet/in.h.
711 * Implemented decoding of HDIO_* and BLK* ioctls.
712 * Added MicroBlaze architecture support.
713 * Added new syscall entries to match Linux 2.6.37.
714 * Regenerated list of ioctl names from Linux 2.6.37.
715 * Enhanced signal notification decoding.
716 * Documented -C and -D options.
719 * Fixed fetching syscall arguments on m68k.
720 * Fixed an error when judging whether a process has children.
721 * Fixed get/set_robust_list syscall numbers for powerpc.
722 * Fixed a corner case in printing clone flags.
723 * Fixed cross-compiling issues.
724 * Fixed build issues on powerpc64, SH and SPARC.
725 * Fixed syscall flags of fstatat*, mmap, mmap2, fadvise64*, swapoff,
726 fgetxattr, flistxattr, fremovexattr, epoll_create, fallocate,
727 fanotify_init, and fanotify_mark syscalls.
728 * Fixed decoding of get[ug]id, gete[ug]id and setfs[ug]id return values.
729 * Fixed biarch support in IO dumping.
730 * Fixed raw exit_group decoding.
731 * Fixed decoding of file descriptors on 64-bit architectures.
732 * Fixed a corner case in waitpid handling.
733 (Addresses Red Hat bug #663547).
734 * Fixed stat64 decoding on mips
735 (Addresses Debian bug #599028).
736 * Fixed misleading italics in the manual page.
737 (Addresses Debian bug #589323).
739 Noteworthy changes in release 4.5.20 (2010-04-13)
740 =================================================
743 * Implemented decoding of new linux syscalls: inotify_init1, recvmmsg.
744 * Implemented basic decoding of new linux syscalls: preadv, pwritev,
745 rt_tgsigqueueinfo, perf_event_open.
746 * Enhanced decoding of recently added syscalls on non-x86 architectures
747 by replacing a bare decoder with elaborate parsers enabled earlier
749 * Implemented -C option to combine regular and -c output.
750 (Addresses Debian bug #466196)
751 * Enhanced decoding of mbind and mremap syscalls.
752 * Enhanced SOL_PACKET socket options decoding.
753 * Regenerated list of ioctl names from linux 2.6.33.
754 * Added TILE architecture support.
757 * Fixed build with Linux kernel headers 2.6.32-rc5+.
758 (Addresses Debian bug #560516 and Fedora bug #539044)
759 * Fixed build on mips.
760 * Fixed handling of Linux systems without struct statfs64.
761 * Fixed reporting signal mask by sigreturn on powerpc.
762 * Fixed potential stack buffer overflow in select decoder.
763 (Addresses Fedora bug #556678)
764 * Corrected msgsnd indirect ipccall decoding.
765 * Corrected decoding of 64bit syscalls.
766 (Addresses Debian bug #570603)
767 * Corrected getsockopt decoding on architectures where
768 sizeof(long) > sizeof(int).
769 (Addresses Debian bug #494844)
770 * Corrected decoding of epoll_pwait.
771 (Addresses Debian bug #513014)
772 * Corrected handling of killed threads.
774 Noteworthy changes in release 4.5.19 (2009-10-21)
775 =================================================
777 * Changes in behavior
778 * When command exits, strace now exits with the same exit status.
779 If command is terminated by a signal, strace terminates itself
780 with the same signal, so that strace can be used as a wrapper
781 process transparent to the invoking parent process.
782 When using -p option, the exit status of strace is zero unless
783 there was an unexpected error in doing the tracing.
784 (Addresses Fedora bug #105371 and Debian bug #37665)
787 * Implemented decoding of new Linux syscalls: accept4, dup3,
788 epoll_create1, eventfd2, inotify_init1, pipe2, signalfd4.
789 * Implemented decoding of socket type flags introduced in Linux 2.6.27.
790 * Implemented decoding of accept4 socketcall.
791 * Enhanced prctl decoding.
792 * Enhanced nanosleep decoding.
793 * Enhanced ptrace decoding.
794 * Enhanced futex decoding.
795 * Enhanced CAP_* decoding.
796 * Enhanced SIOCS* ioctls decoding.
797 * Enhanced fcntl F_* flags decoding.
798 * Enhanced semop/semtimedop decoding.
799 * Updated ARM architecture support.
800 * Added Blackfin architecture support.
801 * Added AVR32 architecture support.
802 * Added CRIS architecture support.
803 * Made strace detect when traced process suddenly disappeared.
806 * Fixed syscall numbers for tee and sync_file_range.
807 (Addresses Debian bug #503124)
808 * Fixed several bugs in strings decoder, including potential heap
810 (Addresses Fedora bugs #470529, #478324 and #511035)
811 * Marked sendfile(2) as a network syscall.
812 (Addresses Debian bug #509499)
813 * Fixed accept(2) decoding.
814 (Addresses Debian bug #507573)
815 * Fixed sigtimedwait(2) decoding.
816 * Fixed build on ARM EABI.
817 (Addresses Debian bugs #520084 and #535564, and Fedora bug #507576)
818 * Fixed display of 32-bit fcntl(F_SETLK) on 64-bit architectures.
819 (Addresses Red Hat bug #471169)
820 * Fixed display of 32-bit argv array on 64-bit architectures.
821 (Addresses Fedora bug #519480)
822 * Fixed display of 32-bit struct sigaction on 64-bit architectures.
823 * Fixed HPPA architecture support.
824 (Addresses Debian bugs #437928 and #546619)
829 * Support new Linux/PPC system call subpage_prot and PROT_SAO flag.
830 * In sigaction system call, display sa_flags value along with SIG_DFL/SIG_IGN.
835 * -F is now deprecated, -f has traced vfork too on Linux for a long time now.
836 * Print O_CLOEXEC, MSG_CMSG_CLOEXEC flag bits.
837 * Improved output for prctl system call on Linux.
838 * Improved support for Linux/ARM.
839 * SA_NOMASK is now spelled SA_NODEFER, and SA_ONESHOT is spelled SA_RESETHAND.
844 * Improved output for delete_module, futex, and mbind system calls on Linux.
845 * Improved output for SG_IO ioctls on Linux.
846 * Support new Linux system calls move_pages, utimensat, signalfd, timerfd,
847 eventfd, getcpu, epoll_pwait.
852 * Several biarch improvements.
853 * Improved output for adjtimex, sysctl, quotactl, mount, umount.
854 * Support new Linux system calls *at, inotify*, pselect6, ppoll and unshare.
859 * Accept numeric system calls in -e.
864 * Introduce "-e trace=desc".
869 * Better x86-64 support for IA32 processes.
870 * Update PowerPC system calls.
871 * Better printing for Linux aio system calls.
875 * Quick fix release for build issues.
876 * One fix for Linux/ARM system call table.
881 * Print fault address for SIGSEGV/SIGBUS signals when available.
886 * Improve socket ioctl printing.
887 * Update Linux/IA64 syscall list.
888 * Fix Linux/x86-64 syscall argument extraction for 32-bit processes.
889 * Improve mount flags printing.
890 * Support symbolic printing of x86_64 arch_prctl parameters.
895 * Update syscall tables for Alpha, ARM, HPPA.
896 * Support new Linux syscalls mbind, set_mempolicy, get_mempolicy, waitid.
897 * Support Linux syscalls fadvise64, fadvise64_64, and epoll_*.
898 * Improve ioctl command name matching.
899 * Print RTC_* ioctl structure contents.
900 * Support newer RLIMIT_* values.
901 * Print struct cmsghdr details in sendmsg.
906 * Print attribute values in *xattr system calls on Linux.
907 * Include pread and pwrite calls in -e read and -e write tracing.
908 * Update SO_* and IP_* value lists and add IPV6_* values for socket options.
909 * Print clock_t values symbolically in Linux clock_* system calls.
913 * Bug fixes, Linux ioctl updates.
914 * David Miller contributed support for Linux/SPARC64.
922 * Update Linux ioctl lists.
923 * Update PF_* and AF_* value lists.
924 * The 4.5.3 -p behavior for NPTL threads applies only under -f, and got fixed.
929 * On Linux using NPTL threads, -p will now attach to all threads in a process.
930 * Handle new mq_* system calls in Linux 2.6.6 and later.
935 * Report some new VM_* bit values on Linux.
936 * Better output for Linux sched_* system calls.
941 * Display multiple ioctl name matches on Linux.
945 * New port to AMD's x86-64 architecture. One strace binary can
946 handle both new x86-64 and old i386 processes.
947 * Fixed support for LFS64 calls.
948 * New switch -E to add/remove environment variables for the command.
949 * Merged s390/s390x port.
950 * Trace an unbounded number of processes.
951 * Handle numerous new system calls in Linux 2.5, and new threads semantics.
952 * Fixed bugs with attach/detach leaving things stopped.
953 * Fixed traced process seeing ECHILD despite live, traced children
954 in waitpid calls with WNOHANG.
955 * Stuart Menefy contributed a port to Linux/SH.
956 * Stephen Thomas contributed a port to Linux/SH64.
957 * Many other bug fixes.
961 * Fix Linux/ia64 support, looks like someone renamed a few things on us
962 * Fix the ioctl setup for Linux, turned out it did not really work.
963 Improve the ioctl extractor as well so we decode some more ones.
967 * compile fixes for Linux/mips
971 * Linux ia64 and hppa ports added
972 * The usual Linux syscall updates (includes 32bit uid/gid support),
973 * Linux ioctl list updated
974 * Support IPv6 scope ids
975 * FreeBSD/i386 port added
976 * UnixWare and Solaris updates
977 * Better support for tracing multithreaded processes in Linux
981 * Compiles on glibc2.0 systems again
982 * Linux/S390 port added
983 * The usual Linux syscall updates
984 * we can follow fork on arm now
988 * Linux/MIPS port added
989 * Lots of Linux updates again
990 * Improved IPv6 support
996 * Compiles on glibc2.0 systems again
1000 * Get stat structure properly on Linux 64bit archs
1001 * Personalities work again
1002 * Compile correctly on SunOS again
1008 * Linux (ultra)sparc fixes
1015 * add support for more Linux architectures (powerpc, sparc, arm)
1016 * support lots more Linux syscalls
1017 * fix signal handling
1018 * add IPX and IPIP support
1019 * check stray syscall after execv
1020 * fix hanging children
1022 Changes in version 3.1
1023 ======================
1025 * Irix5 is supported
1026 * Linux 68k is supported
1027 * Linux alpha is supported
1028 * configure is upgraded to autoconf 2.x
1029 * using -f in combination with -e now works correctly
1030 * output can be piped to a program
1031 * tracing setuid programs works better
1032 * it is now reasonable to install strace setuid to root in some circumstances
1033 * new useful tracing names like file and process to trace whole
1034 classes of system calls, e.g. -efile traces all system calls that
1035 take a file name as an argument
1036 * IPC calls on SunOS 4.1.x are decoded
1037 * Linux program memory is reliably dereferenced
1038 * Linux decodes at least the name of all syscalls as of pre2.0.4
1039 * various cosmetic changes and bug fixes
1041 Changes from versions 2.x to version 3.0
1042 ========================================
1044 * filename arguments are neither abbreviated nor stringified
1045 * string arguments are now true C strings using octal instead of hex by default
1046 * preprocessor constants are never shortened (e.g. was RDONLY => now O_RDONLY)
1047 * by default the output for multiple processes now goes into one file
1048 * all structures, vectors, bitsets, etc. use consistent output formats
1049 * the -c option now means count calls, -i does what the old -c used to do
1051 New Features in version 3.0
1052 ===========================
1054 * non-ascii strings can be optionally printed entirely in hex
1055 * the output format is readable when multiple processes are generating output
1056 * exit values are printed in an alignment column
1057 * is is possible to suppress messages about attaching and detaching
1058 * various tracing features can be enabled on a per syscall/signal/desc basis
1059 * selective tracing of syscalls
1060 * selective printing of syscall structures
1061 * selective abbreviation of long structures on a per syscall basis
1062 * selective printing of raw syscall arguments and results
1063 * selective tracing of signals
1064 * selective dumping of all I/O read from file descriptors
1065 * selective dumping of all I/O written to file descriptors
1066 * optional counting of time, calls, and errors for each syscall