1 Noteworthy changes in release ?.?? (????-??-??)
2 ===============================================
4 Noteworthy changes in release 4.10 (2015-03-06)
5 ===============================================
8 * Added -yy option to print protocol and address information associated with
10 * Extended "-e read=set" and "-e write=set" options to cover sendmsg,
11 recvmsg, sendmmsg, and recvmmsg syscalls.
12 * Implemented full 32-bit decoding of ioctl commands
13 (addresses Debian bug #692913 and Fedora bug #902788).
14 * Implemented PTRACE_GETREGS API support on ia64.
15 * Implemented PTRACE_GETREGS API support on mips.
16 * Implemented PTRACE_GETREGSET API support on s390/s390x.
17 * Implemented decoding of getrandom and seccomp syscalls.
18 * Implemented full decoding of 64-bit capability sets.
19 * Implemented decoding of all prctl commands.
20 * Implemented decoding of parametrized ioctl commands.
21 * Implemented decoding of evdev ioctl commands.
22 * Implemented decoding of v4l ioctl commands.
23 * Implemented decoding of SG_IO v4 ioctl commands.
24 * Implemented decoding of FIFREEZE/FITHAW/FITRIM ioctl commands.
25 * Implemented decoding of FALLOC_FL_* fallocate flags.
26 * Implemented decoding of rt_sigreturn signal mask on aarch64,
28 * Enhanced socket decoder to support bluetooth sockets.
29 * Enhanced decoding of unlisted ioctl commands.
30 * Enhanced decoding of getsockopt and setsockopt syscall.
31 * Enhanced decoding of sysinfo syscall.
32 * Enhanced decoding of struct cmsghdr.
33 * Enhanced decoding of wait status.
34 * Enhanced aio support on non-x86 architectures by using external libaio.h.
35 * Added O_TMPFILE to the list of recognized open mode flags.
36 * Updated the list of filesystem type constants that is used in decoding
37 statfs family syscalls.
38 * Updated lists of CAP_*, PR_*, PTRACE_*, SCHED_*, SO_*, SOL_*, SWAP_FLAG_*,
40 * Updated lists of signal constants from Linux 3.19.
41 * Updated lists of errno constants from Linux 3.19.
42 * Updated lists of ioctl commands from Linux 3.9.
43 * Added new syscall entries to match Linux 3.19.
46 * Fixed various errors in mapping between syscall numbers and associated
47 information like the number of syscall arguments, the name of syscall,
49 * Fixed quoting issues in printing descriptors, filenames, network interface
50 names, struct utsname members, device/volume names of BLK* ioctl commands.
51 * Fixed uid_t/git_t decoding.
52 * Fixed potential out-of-bounds read issues in getdents/getdents64 decoders.
53 * Fixed potential open flags truncation on some architectures.
54 * Fixed decoding of struct ifreq.ifr_name.
55 * Fixed decoding of SIOCSIFNAME ioctl command.
56 * Fixed decoding of RENAME_* renameat2 flags.
57 * Fixed decoding of UTIME_NOW/UTIME_OMIT timeval structures.
58 * Fixed decoding of indirect ipc subcalls on some architectures.
59 * Fixed decoding of fanotify_mark syscall on 32-bit architectures.
60 * Fixed decoding of 32-bit stat structures on 64-bit architectures.
61 * Fixed decoding of 32-bit struct cmsghdr on 64-bit architectures.
62 * Fixed decoding of 32-bit preadv/pwritev offset on 64-bit architectures.
63 * Fixed decoding of sigreturn/rt_sigreturn signal mask on ia64, ppc, ppc64,
64 sparc, sparc64, mips, and s390.
65 * Fixed instruction pointer output (-i option) on architectures that support
66 several personalities.
67 * Fixed behaviour of "-e read=set" and "-e write=set" when read and write
69 * Fixed build on systems where struct sigaction has no sa_restorer member.
70 * Fixed build with uclibc and musl libc.
73 * Linux kernel >= 2.5.46 is required.
74 Older versions without a decent PTRACE_SETOPTIONS support will not work.
75 * On mips, linux kernel >= 2.6.15 is required.
76 Older versions without a decent PTRACE_GETREGS support will not work.
77 * On s390 and s390x, linux kernel >= 2.6.27 is required.
78 Older versions without a decent PTRACE_GETREGSET support will not work.
80 Noteworthy changes in release 4.9 (2014-08-15)
81 ==============================================
84 * Disabled OABI support on ARM EABI systems by default,
85 added --enable-arm-oabi option to enable it at configure time.
88 * Added experimental -k option to print stack trace after each traced syscall.
89 * Added -w option to produce stats on syscall latency.
90 (addresses Debian bug #457497).
91 * Added ARC architecture support.
92 * Added PTRACE_GETREGS API support on PowerPC.
93 * Enhanced Bionic libc and musl libc support.
94 * Enhanced tracing of x86 personality processes on x86_64 and x32.
95 * Enhanced tracing of ARM personality processes on AArch64.
96 * Enhanced 32/64bit personality detection on PowerPC.
97 * Implemented decoding of add_key, ioprio_get, ioprio_set, kexec_load, keyctl,
98 renameat2, and request_key syscalls.
99 * Robustified decoding of select, pselect, and io_submit syscalls.
100 * Enhanced decoding of delete_module, fanotify_init, fanotify_mark, fcntl,
101 setdomainname, sethostname, setns, and sync_file_range syscalls.
102 * Enhanced decoding of signal bitmasks.
103 * Enhanced decoding of file descriptors.
104 * Enhanced siginfo_t decoding.
105 * Enhanced PF_NETLINK decoding.
106 * Updated CLOCK_* constants
107 (addresses Fedora bug #1088455).
108 * Added new syscall entries to match Linux 3.16.
111 * Added shmat and shmdt to the set of memory mapping related syscalls.
112 * Fixed detaching from stopped processes.
113 * Fixed fanotify_mark decoding on 32bit architectures.
114 * Fixed offset decoding in preadv and pwritev syscalls.
115 * Fixed select decoding for glibc in _FORTIFY_SOURCE mode.
116 * Fixed decoding of epoll_ctl syscall with EPOLL_CTL_DEL argument.
117 * Fixed build when <sys/ptrace.h> and <linux/ptrace.h> conflict
118 (addresses Fedora bug #993384).
119 * Miscellaneous corrections in the manual page.
120 (Addresses Debian bug #725987).
122 Noteworthy changes in release 4.8 (2013-06-03)
123 ==============================================
125 * Changes in behavior
126 * In case of normal strace termination, when the trace output is
127 redirected to a pipe, strace now closes it and waits for the pipe
128 process termination before exit.
131 * Implemented tracing using PTRACE_SEIZE API (when available).
132 * Implemented more reliable PTRACE_GETREGSET-based process personality
133 detection on x86-64 and x32 (when available).
134 * Added -e trace=memory option for tracing memory mapping related syscalls.
135 * Documented -b option.
136 * Allowed exit status messages to be suppressed by giving -q option twice.
137 * Added AArch64 architecture support
138 (addresses Debian bug #693074 and Fedora bug #969858).
139 * Added support for OpenRISC 1000, Meta, and Xtensa architectures.
140 * Added tilegx personality support for Tile.
141 * Enhanced support of NOMMU architectures.
142 * Enhanced decoding of getdents, mmap, perf_event_open, ptrace, and
144 * Added new syscall entries to match Linux 3.9.
145 * Regenerated the list of common ioctl names from Linux 3.9.
146 * Updated the list of errno constants.
147 * Updated lists of AF_*, MADV_*, MAP_*, MSG_*, MS_*, PF_*, PR_*,
148 PTRACE_O_*, and TCP_* constants.
149 * Implemented decoding of UBI ioctls.
150 * Removed redundant "*32" ioctl names.
153 * Fixed ERESTARTNOINTR leaking to userspace on ancient kernels
154 (addresses Fedora bug #659382).
155 * Fixed kernel release string parsing
156 (addresses Debian bug #702309).
157 * Fixed decoding of *xattr syscalls
158 (addresses Fedora bug #885233).
159 * Fixed handling of files with 64-bit inode numbers by 32-bit strace
160 (addresses Fedora bug #912790).
161 * Fixed tracing forks on SPARC.
162 * Fixed decoding of fadvise64, fallocate, ftruncate64, io_submit, pread,
163 preadv, pwrite, pwritev, readahead, sigaltstack, sync_file_range, sysctl,
164 and truncate64 syscalls.
165 * Fixed categories of multiple syscalls on most of supported architectures.
166 * Fixed decoding of non-native 32-bit personality recv[m]msg syscalls.
167 * Fixed decoding of multiple 32-bit personality syscalls on x32.
168 * Fixed decoding of long long syscall arguments on ARM, MIPS/o32, PowerPC,
169 S390x, and Tile architectures.
170 * Fixed semtimedop decoding on S390x.
171 * Fixed sram_alloc decoding on Blackfin.
172 * Fixed build when process_vm_readv is a stab.
173 * Fixed build with older versions of libaio.h.
175 Noteworthy changes in release 4.7 (2012-05-02)
176 ==============================================
178 * Changes in behavior
179 * strace no longer suspends waitpid until there is a child
180 for waitpid'ing process to collect status from.
181 * strace no longer detaches from a tracee which is supposed
183 * strace now issues a new message: "+++ exited with EXITCODE +++"
184 which shows exact moment strace got exit notification,
185 analogous to existing "+++ killed by SIG +++" message.
188 * Added x32 personality support (x86_64 architecture).
189 * Added -y and -P options to print file descriptor paths and
190 filter by those paths.
191 * Added -I option to control strace interactivity.
192 * Allowed -p option to take comma or whitespace-separated list of PIDs.
193 * Added strace_log_merge script helper to merge timestamped "strace -ff"
195 * Implemented decoding of clock_adjtime, get_robust_list, migrate_pages,
196 preadv, prlimit64, process_vm_readv, process_vm_writev, pwritev,
197 recvmmsg, recvmsg, rt_tgsigqueueinfo, sendmmsg, setns, set_robust_list,
198 sched_rr_get_interval, splice, syslog, tee and vmsplice syscalls.
199 * Enhanced decoding of capget, capset, getrlimit, flistxattr, io_submit,
200 listxattr, setrlimit and swapon syscalls.
201 * Implemented decoding of loop and mtd ioctls.
202 * Added syscall entries for new linux syscalls.
203 * Added syscall entries for direct socket system calls on powerpc.
204 * Updated the list of errno constants.
205 * Updated lists of MSG_*, STA_*, and TCP_* constants.
206 * Regenerated the list of ioctl names from Linux 3.3.
207 * Enhanced switching between processes with different personalities.
208 * Enhanced signals reporting by using short signal names.
209 * Made ERESTART* messages more descriptive.
210 * Made parsing of numbers from strings more robust.
211 * Added support for compat_statfs64 and statfs64.f_flags.
212 * Changed read of data blocks to use single process_vm_readv syscall
213 (when available) instead of several PTRACE_PEEKDATA operations.
214 * Changed read of registers on x86 and x86-64 to use single PTRACE_GETREGS
215 operation instead of several PTRACE_PEEKUSER operations.
216 * Applied various optimizations to make strace work faster.
219 * Implemented proper handling of real SIGTRAPs on kernels supporting
220 PTRACE_O_TRACESYSGOOD.
221 (Addresses Fedora bug #162774).
222 * Fixed sockaddr_un.sun_path name in decoded output.
223 (Addresses Debian bug #554946).
224 * Fixed to avoid potential core file clobbering on exit.
225 (Addresses Debian bug #656398).
226 * Fixed a typo in documentation.
227 (Addresses Debian bug #653309).
228 * Fixed decoding of timer id returned by timer_create.
229 * Fixed epoll_create1, epoll_wait and epoll_pwait decoding.
230 * Fixed *at syscalls flags decoding.
231 * Fixed ARM EABI 64-bit syscall's arguments decoding.
232 * Fixed semtimedop decoding on s390.
233 * Fixed osf_sigprocmask decoding on alpha.
234 * Fixed ipc and socket subcall decoding on several architectures.
235 * Corrected syscall entries for epoll_pwait, epoll_create, epoll_ctl,
236 epoll_wait, mincore, mlockall, prctl, reboot, sendfile, sendfile64,
237 sendmsg, sgetmask, ssetmask, swapon, tgkill and tkill syscalls.
238 * Corrected io_* syscall entries on ARM.
239 * Fixed PID prefix printing in "strace -oLOG -ff -p1 -p2 -p3" case.
240 * Fixed logging of unfinished lines in "strace -oLOG -ff" case.
241 * Fixed build when libaio-devel is not available.
242 * Fixed configure checks for PTRACE_* constants.
243 * Fixed compilation warnings remained on several architectures.
246 * Removed all non-Linux code. After years of neglect, that dead code
247 just hampered further strace development.
248 * Linux kernel >= 2.6.18 is recommended. Older versions might still
249 work but they haven't been thoroughly tested with this release.
251 Noteworthy changes in release 4.6 (2011-03-15)
252 ==============================================
254 * Changes in behavior
255 * Print diagnostic information about changes in personality mode to
256 standard error instead of standard output.
259 * Implemented a new method of following clone, fork, and vfork
260 syscalls using the Linux kernel's explicit facilities for tracing
261 creation of threads and child processes.
262 * Implemented CLONE_PARENT and CLONE_UNTRACED flags handling.
263 * Implemented decoding of TLS syscalls on m68k.
264 * Implemented biarch support on powerpc64.
265 * Implemented biarch support for getrlimit() and setrlimit().
266 * Implemented decoding of struct ucred in getsockopt SO_PEERCRED.
267 * Implemented SOL_SCTP socket options decoding.
268 * Added HDIO_* ioctl names.
269 (Addresses Debian bug #450953).
270 * Added LOOP_* ioctl names.
271 * Updated lists of CLOCK_*, CLONE_*, MS_*, and SOL_* constants
272 to match Linux 2.6.37.
273 * Updated the list of IPPROTO_* constants to match netinet/in.h.
274 * Implemented decoding of HDIO_* and BLK* ioctls.
275 * Added MicroBlaze architecture support.
276 * Added new syscall entries to match Linux 2.6.37.
277 * Regenerated list of ioctl names from Linux 2.6.37.
278 * Enhanced signal notification decoding.
279 * Documented -C and -D options.
282 * Fixed fetching syscall arguments on m68k.
283 * Fixed an error when judging whether a process has children.
284 * Fixed get/set_robust_list syscall numbers for powerpc.
285 * Fixed a corner case in printing clone flags.
286 * Fixed cross-compiling issues.
287 * Fixed build issues on powerpc64, SH and SPARC.
288 * Fixed syscall flags of fstatat*, mmap, mmap2, fadvise64*, swapoff,
289 fgetxattr, flistxattr, fremovexattr, epoll_create, fallocate,
290 fanotify_init, and fanotify_mark syscalls.
291 * Fixed decoding of get[ug]id, gete[ug]id and setfs[ug]id return values.
292 * Fixed biarch support in IO dumping.
293 * Fixed raw exit_group decoding.
294 * Fixed decoding of file descriptors on 64-bit architectures.
295 * Fixed a corner case in waitpid handling.
296 (Addresses Red Hat bug #663547).
297 * Fixed stat64 decoding on mips
298 (Addresses Debian bug #599028).
299 * Fixed misleading italics in the manual page.
300 (Addresses Debian bug #589323).
302 Noteworthy changes in release 4.5.20 (2010-04-13)
303 =================================================
306 * Implemented decoding of new linux syscalls: inotify_init1, recvmmsg.
307 * Implemented basic decoding of new linux syscalls: preadv, pwritev,
308 rt_tgsigqueueinfo, perf_event_open.
309 * Enhanced decoding of recently added syscalls on non-x86 architectures
310 by replacing a bare decoder with elaborate parsers enabled earlier
312 * Implemented -C option to combine regular and -c output.
313 (Addresses Debian bug #466196)
314 * Enhanced decoding of mbind and mremap syscalls.
315 * Enhanced SOL_PACKET socket options decoding.
316 * Regenerated list of ioctl names from linux 2.6.33.
317 * Added TILE architecture support.
320 * Fixed build with Linux kernel headers 2.6.32-rc5+.
321 (Addresses Debian bug #560516 and Fedora bug #539044)
322 * Fixed build on mips.
323 * Fixed handling of Linux systems without struct statfs64.
324 * Fixed reporting signal mask by sigreturn on powerpc.
325 * Fixed potential stack buffer overflow in select decoder.
326 (Addresses Fedora bug #556678)
327 * Corrected msgsnd indirect ipccall decoding.
328 * Corrected decoding of 64bit syscalls.
329 (Addresses Debian bug #570603)
330 * Corrected getsockopt decoding on architectures where
331 sizeof(long) > sizeof(int).
332 (Addresses Debian bug #494844)
333 * Corrected decoding of epoll_pwait.
334 (Addresses Debian bug #513014)
335 * Corrected handling of killed threads.
337 Noteworthy changes in release 4.5.19 (2009-10-21)
338 =================================================
340 * Changes in behavior
341 * When command exits, strace now exits with the same exit status.
342 If command is terminated by a signal, strace terminates itself
343 with the same signal, so that strace can be used as a wrapper
344 process transparent to the invoking parent process.
345 When using -p option, the exit status of strace is zero unless
346 there was an unexpected error in doing the tracing.
347 (Addresses Fedora bug #105371 and Debian bug #37665)
350 * Implemented decoding of new Linux syscalls: accept4, dup3,
351 epoll_create1, eventfd2, inotify_init1, pipe2, signalfd4.
352 * Implemented decoding of socket type flags introduced in Linux 2.6.27.
353 * Implemented decoding of accept4 socketcall.
354 * Enhanced prctl decoding.
355 * Enhanced nanosleep decoding.
356 * Enhanced ptrace decoding.
357 * Enhanced futex decoding.
358 * Enhanced CAP_* decoding.
359 * Enhanced SIOCS* ioctls decoding.
360 * Enhanced fcntl F_* flags decoding.
361 * Enhanced semop/semtimedop decoding.
362 * Updated ARM architecture support.
363 * Added Blackfin architecture support.
364 * Added AVR32 architecture support.
365 * Added CRIS architecture support.
366 * Made strace detect when traced process suddenly disappeared.
369 * Fixed syscall numbers for tee and sync_file_range.
370 (Addresses Debian bug #503124)
371 * Fixed several bugs in strings decoder, including potential heap
373 (Addresses Fedora bugs #470529, #478324 and #511035)
374 * Marked sendfile(2) as a network syscall.
375 (Addresses Debian bug #509499)
376 * Fixed accept(2) decoding.
377 (Addresses Debian bug #507573)
378 * Fixed sigtimedwait(2) decoding.
379 * Fixed build on ARM EABI.
380 (Addresses Debian bugs #520084 and #535564, and Fedora bug #507576)
381 * Fixed display of 32-bit fcntl(F_SETLK) on 64-bit architectures.
382 (Addresses Red Hat bug #471169)
383 * Fixed display of 32-bit argv array on 64-bit architectures.
384 (Addresses Fedora bug #519480)
385 * Fixed display of 32-bit struct sigaction on 64-bit architectures.
386 * Fixed HPPA architecture support.
387 (Addresses Debian bugs #437928 and #546619)
392 * Support new Linux/PPC system call subpage_prot and PROT_SAO flag.
393 * In sigaction system call, display sa_flags value along with SIG_DFL/SIG_IGN.
398 * -F is now deprecated, -f has traced vfork too on Linux for a long time now.
399 * Print O_CLOEXEC, MSG_CMSG_CLOEXEC flag bits.
400 * Improved output for prctl system call on Linux.
401 * Improved support for Linux/ARM.
402 * SA_NOMASK is now spelled SA_NODEFER, and SA_ONESHOT is spelled SA_RESETHAND.
407 * Improved output for delete_module, futex, and mbind system calls on Linux.
408 * Improved output for SG_IO ioctls on Linux.
409 * Support new Linux system calls move_pages, utimensat, signalfd, timerfd,
410 eventfd, getcpu, epoll_pwait.
415 * Several biarch improvements.
416 * Improved output for adjtimex, sysctl, quotactl, mount, umount.
417 * Support new Linux system calls *at, inotify*, pselect6, ppoll and unshare.
422 * Accept numeric system calls in -e.
427 * Introduce "-e trace=desc".
432 * Better x86-64 support for IA32 processes.
433 * Update PowerPC system calls.
434 * Better printing for Linux aio system calls.
438 * Quick fix release for build issues.
439 * One fix for Linux/ARM system call table.
444 * Print fault address for SIGSEGV/SIGBUS signals when available.
449 * Improve socket ioctl printing.
450 * Update Linux/IA64 syscall list.
451 * Fix Linux/x86-64 syscall argument extraction for 32-bit processes.
452 * Improve mount flags printing.
453 * Support symbolic printing of x86_64 arch_prctl parameters.
458 * Update syscall tables for Alpha, ARM, HPPA.
459 * Support new Linux syscalls mbind, set_mempolicy, get_mempolicy, waitid.
460 * Support Linux syscalls fadvise64, fadvise64_64, and epoll_*.
461 * Improve ioctl command name matching.
462 * Print RTC_* ioctl structure contents.
463 * Support newer RLIMIT_* values.
464 * Print struct cmsghdr details in sendmsg.
469 * Print attribute values in *xattr system calls on Linux.
470 * Include pread and pwrite calls in -e read and -e write tracing.
471 * Update SO_* and IP_* value lists and add IPV6_* values for socket options.
472 * Print clock_t values symbolically in Linux clock_* system calls.
476 * Bug fixes, Linux ioctl updates.
477 * David Miller contributed support for Linux/SPARC64.
485 * Update Linux ioctl lists.
486 * Update PF_* and AF_* value lists.
487 * The 4.5.3 -p behavior for NPTL threads applies only under -f, and got fixed.
492 * On Linux using NPTL threads, -p will now attach to all threads in a process.
493 * Handle new mq_* system calls in Linux 2.6.6 and later.
498 * Report some new VM_* bit values on Linux.
499 * Better output for Linux sched_* system calls.
504 * Display multiple ioctl name matches on Linux.
508 * New port to AMD's x86-64 architecture. One strace binary can
509 handle both new x86-64 and old i386 processes.
510 * Fixed support for LFS64 calls.
511 * New switch -E to add/remove environment variables for the command.
512 * Merged s390/s390x port.
513 * Trace an unbounded number of processes.
514 * Handle numerous new system calls in Linux 2.5, and new threads semantics.
515 * Fixed bugs with attach/detach leaving things stopped.
516 * Fixed traced process seeing ECHILD despite live, traced children
517 in waitpid calls with WNOHANG.
518 * Stuart Menefy contributed a port to Linux/SH.
519 * Stephen Thomas contributed a port to Linux/SH64.
520 * Many other bug fixes.
524 * Fix Linux/ia64 support, looks like someone renamed a few things on us
525 * Fix the ioctl setup for Linux, turned out it did not really work.
526 Improve the ioctl extracter as well so we decode some more ones.
530 * compile fixes for Linux/mips
534 * Linux ia64 and hppa ports added
535 * The usual Linux syscall updates (includes 32bit uid/gid support),
536 * Linux ioctl list updated
537 * Support IPv6 scope ids
538 * FreeBSD/i386 port added
539 * UnixWare and Solaris updates
540 * Better support for tracing multithreaded processes in Linux
544 * Compiles on glibc2.0 systems again
545 * Linux/S390 port added
546 * The usual Linux syscall updates
547 * we can follow fork on arm now
551 * Linux/MIPS port added
552 * Lots of Linux updates again
553 * Improved IPv6 support
559 * Compiles on glibc2.0 systems again
563 * Get stat structure properly on Linux 64bit archs
564 * Personalities work again
565 * Compile correctly on SunOS again
571 * Linux (ultra)sparc fixes
578 * add support for more Linux architectures (powerpc, sparc, arm)
579 * support lots more Linux syscalls
580 * fix signal handling
581 * add IPX and IPIP support
582 * check stray syscall after execv
583 * fix hanging children
585 Changes in version 3.1
586 ======================
589 * Linux 68k is supported
590 * Linux alpha is supported
591 * configure is upgraded to autoconf 2.x
592 * using -f in combination with -e now works correctly
593 * output can be piped to a program
594 * tracing setuid programs works better
595 * it is now reasonable to install strace setuid to root in some circumstances
596 * new useful tracing names like file and process to trace whole
597 classes of system calls, e.g. -efile traces all system calls that
598 take a file name as an argument
599 * IPC calls on SunOS 4.1.x are decoded
600 * Linux program memory is reliably dereferenced
601 * Linux decodes at least the name of all syscalls as of pre2.0.4
602 * various cosmetic changes and bug fixes
604 Changes from versions 2.x to version 3.0
605 ========================================
607 * filename arguments are neither abbreviated nor stringified
608 * string arguments are now true C strings using octal instead of hex by default
609 * preprocessor constants are never shortened (e.g. was RDONLY => now O_RDONLY)
610 * by default the output for multiple processes now goes into one file
611 * all structures, vectors, bitsets, etc. use consistent output formats
612 * the -c option now means count calls, -i does what the old -c used to do
614 New Features in version 3.0
615 ===========================
617 * non-ascii strings can be optionally printed entirely in hex
618 * the output format is readable when mutiple processes are generating output
619 * exit values are printed in an alignment column
620 * is is possible to suppress messages about attaching and detaching
621 * various tracing features can be enabled on a per syscall/signal/desc basis
622 * selective tracing of syscalls
623 * selective printing of syscall structures
624 * selective abbreviation of long structures on a per syscall basis
625 * selective printing of raw syscall arguments and results
626 * selective tracing of signals
627 * selective dumping of all I/O read from file descriptors
628 * selective dumping of all I/O written to file descriptors
629 * optional counting of time, calls, and errors for each syscall