Noteworthy changes in release 4.10 (2015-03-06) =============================================== * Improvements * Added -yy option to print protocol and address information associated with socket descriptors. * Extended "-e read=set" and "-e write=set" options to cover sendmsg, recvmsg, sendmmsg, and recvmmsg syscalls. * Implemented full 32-bit decoding of ioctl commands (addresses Debian bug #692913 and Fedora bug #902788). * Implemented PTRACE_GETREGS API support on ia64. * Implemented PTRACE_GETREGS API support on mips. * Implemented PTRACE_GETREGSET API support on s390/s390x. * Implemented decoding of getrandom and seccomp syscalls. * Implemented full decoding of 64-bit capability sets. * Implemented decoding of all prctl commands. * Implemented decoding of parametrized ioctl commands. * Implemented decoding of evdev ioctl commands. * Implemented decoding of v4l ioctl commands. * Implemented decoding of SG_IO v4 ioctl commands. * Implemented decoding of FIFREEZE/FITHAW/FITRIM ioctl commands. * Implemented decoding of FALLOC_FL_* fallocate flags. * Implemented decoding of rt_sigreturn signal mask on aarch64, x32, and x86_64. * Enhanced socket decoder to support bluetooth sockets. * Enhanced decoding of unlisted ioctl commands. * Enhanced decoding of getsockopt and setsockopt syscall. * Enhanced decoding of sysinfo syscall. * Enhanced decoding of struct cmsghdr. * Enhanced decoding of wait status. * Enhanced aio support on non-x86 architectures by using external libaio.h. * Added O_TMPFILE to the list of recognized open mode flags. * Updated the list of filesystem type constants that is used in decoding statfs family syscalls. * Updated lists of CAP_*, PR_*, PTRACE_*, SCHED_*, SO_*, SOL_*, SWAP_FLAG_*, and TFD_* constants. * Updated lists of signal constants from Linux 3.19. * Updated lists of errno constants from Linux 3.19. * Updated lists of ioctl commands from Linux 3.9. * Added new syscall entries to match Linux 3.19. * Bug fixes * Fixed various errors in mapping between syscall numbers and associated information like the number of syscall arguments, the name of syscall, and syscall decoder. * Fixed quoting issues in printing descriptors, filenames, network interface names, struct utsname members, device/volume names of BLK* ioctl commands. * Fixed uid_t/git_t decoding. * Fixed potential out-of-bounds read issues in getdents/getdents64 decoders. * Fixed potential open flags truncation on some architectures. * Fixed decoding of struct ifreq.ifr_name. * Fixed decoding of SIOCSIFNAME ioctl command. * Fixed decoding of RENAME_* renameat2 flags. * Fixed decoding of UTIME_NOW/UTIME_OMIT timeval structures. * Fixed decoding of indirect ipc subcalls on some architectures. * Fixed decoding of fanotify_mark syscall on 32-bit architectures. * Fixed decoding of 32-bit stat structures on 64-bit architectures. * Fixed decoding of 32-bit struct cmsghdr on 64-bit architectures. * Fixed decoding of 32-bit preadv/pwritev offset on 64-bit architectures. * Fixed decoding of sigreturn/rt_sigreturn signal mask on ia64, ppc, ppc64, sparc, sparc64, mips, and s390. * Fixed instruction pointer output (-i option) on architectures that support several personalities. * Fixed behaviour of "-e read=set" and "-e write=set" when read and write sets intersect. * Fixed build on systems where struct sigaction has no sa_restorer member. * Fixed build with uclibc and musl libc. * Portability * Linux kernel >= 2.5.46 is required. Older versions without a decent PTRACE_SETOPTIONS support will not work. * On mips, linux kernel >= 2.6.15 is required. Older versions without a decent PTRACE_GETREGS support will not work. * On s390 and s390x, linux kernel >= 2.6.27 is required. Older versions without a decent PTRACE_GETREGSET support will not work. Noteworthy changes in release 4.9 (2014-08-15) ============================================== * Changes in behavior * Disabled OABI support on ARM EABI systems by default, added --enable-arm-oabi option to enable it at configure time. * Improvements * Added experimental -k option to print stack trace after each traced syscall. * Added -w option to produce stats on syscall latency. (addresses Debian bug #457497). * Added ARC architecture support. * Added PTRACE_GETREGS API support on PowerPC. * Enhanced Bionic libc and musl libc support. * Enhanced tracing of x86 personality processes on x86_64 and x32. * Enhanced tracing of ARM personality processes on AArch64. * Enhanced 32/64bit personality detection on PowerPC. * Implemented decoding of add_key, ioprio_get, ioprio_set, kexec_load, keyctl, renameat2, and request_key syscalls. * Robustified decoding of select, pselect, and io_submit syscalls. * Enhanced decoding of delete_module, fanotify_init, fanotify_mark, fcntl, setdomainname, sethostname, setns, and sync_file_range syscalls. * Enhanced decoding of signal bitmasks. * Enhanced decoding of file descriptors. * Enhanced siginfo_t decoding. * Enhanced PF_NETLINK decoding. * Updated CLOCK_* constants (addresses Fedora bug #1088455). * Added new syscall entries to match Linux 3.16. * Bug fixes * Added shmat and shmdt to the set of memory mapping related syscalls. * Fixed detaching from stopped processes. * Fixed fanotify_mark decoding on 32bit architectures. * Fixed offset decoding in preadv and pwritev syscalls. * Fixed select decoding for glibc in _FORTIFY_SOURCE mode. * Fixed decoding of epoll_ctl syscall with EPOLL_CTL_DEL argument. * Fixed build when and conflict (addresses Fedora bug #993384). * Miscellaneous corrections in the manual page. (Addresses Debian bug #725987). Noteworthy changes in release 4.8 (2013-06-03) ============================================== * Changes in behavior * In case of normal strace termination, when the trace output is redirected to a pipe, strace now closes it and waits for the pipe process termination before exit. * Improvements * Implemented tracing using PTRACE_SEIZE API (when available). * Implemented more reliable PTRACE_GETREGSET-based process personality detection on x86-64 and x32 (when available). * Added -e trace=memory option for tracing memory mapping related syscalls. * Documented -b option. * Allowed exit status messages to be suppressed by giving -q option twice. * Added AArch64 architecture support (addresses Debian bug #693074 and Fedora bug #969858). * Added support for OpenRISC 1000, Meta, and Xtensa architectures. * Added tilegx personality support for Tile. * Enhanced support of NOMMU architectures. * Enhanced decoding of getdents, mmap, perf_event_open, ptrace, and quotactl syscalls. * Added new syscall entries to match Linux 3.9. * Regenerated the list of common ioctl names from Linux 3.9. * Updated the list of errno constants. * Updated lists of AF_*, MADV_*, MAP_*, MSG_*, MS_*, PF_*, PR_*, PTRACE_O_*, and TCP_* constants. * Implemented decoding of UBI ioctls. * Removed redundant "*32" ioctl names. * Bug fixes * Fixed ERESTARTNOINTR leaking to userspace on ancient kernels (addresses Fedora bug #659382). * Fixed kernel release string parsing (addresses Debian bug #702309). * Fixed decoding of *xattr syscalls (addresses Fedora bug #885233). * Fixed handling of files with 64-bit inode numbers by 32-bit strace (addresses Fedora bug #912790). * Fixed tracing forks on SPARC. * Fixed decoding of fadvise64, fallocate, ftruncate64, io_submit, pread, preadv, pwrite, pwritev, readahead, sigaltstack, sync_file_range, sysctl, and truncate64 syscalls. * Fixed categories of multiple syscalls on most of supported architectures. * Fixed decoding of non-native 32-bit personality recv[m]msg syscalls. * Fixed decoding of multiple 32-bit personality syscalls on x32. * Fixed decoding of long long syscall arguments on ARM, MIPS/o32, PowerPC, S390x, and Tile architectures. * Fixed semtimedop decoding on S390x. * Fixed sram_alloc decoding on Blackfin. * Fixed build when process_vm_readv is a stab. * Fixed build with older versions of libaio.h. Noteworthy changes in release 4.7 (2012-05-02) ============================================== * Changes in behavior * strace no longer suspends waitpid until there is a child for waitpid'ing process to collect status from. * strace no longer detaches from a tracee which is supposed to be going to die. * strace now issues a new message: "+++ exited with EXITCODE +++" which shows exact moment strace got exit notification, analogous to existing "+++ killed by SIG +++" message. * Improvements * Added x32 personality support (x86_64 architecture). * Added -y and -P options to print file descriptor paths and filter by those paths. * Added -I option to control strace interactivity. * Allowed -p option to take comma or whitespace-separated list of PIDs. * Added strace_log_merge script helper to merge timestamped "strace -ff" log files. * Implemented decoding of clock_adjtime, get_robust_list, migrate_pages, preadv, prlimit64, process_vm_readv, process_vm_writev, pwritev, recvmmsg, recvmsg, rt_tgsigqueueinfo, sendmmsg, setns, set_robust_list, sched_rr_get_interval, splice, syslog, tee and vmsplice syscalls. * Enhanced decoding of capget, capset, getrlimit, flistxattr, io_submit, listxattr, setrlimit and swapon syscalls. * Implemented decoding of loop and mtd ioctls. * Added syscall entries for new linux syscalls. * Added syscall entries for direct socket system calls on powerpc. * Updated the list of errno constants. * Updated lists of MSG_*, STA_*, and TCP_* constants. * Regenerated the list of ioctl names from Linux 3.3. * Enhanced switching between processes with different personalities. * Enhanced signals reporting by using short signal names. * Made ERESTART* messages more descriptive. * Made parsing of numbers from strings more robust. * Added support for compat_statfs64 and statfs64.f_flags. * Changed read of data blocks to use single process_vm_readv syscall (when available) instead of several PTRACE_PEEKDATA operations. * Changed read of registers on x86 and x86-64 to use single PTRACE_GETREGS operation instead of several PTRACE_PEEKUSER operations. * Applied various optimizations to make strace work faster. * Bug fixes * Implemented proper handling of real SIGTRAPs on kernels supporting PTRACE_O_TRACESYSGOOD. (Addresses Fedora bug #162774). * Fixed sockaddr_un.sun_path name in decoded output. (Addresses Debian bug #554946). * Fixed to avoid potential core file clobbering on exit. (Addresses Debian bug #656398). * Fixed a typo in documentation. (Addresses Debian bug #653309). * Fixed decoding of timer id returned by timer_create. * Fixed epoll_create1, epoll_wait and epoll_pwait decoding. * Fixed *at syscalls flags decoding. * Fixed ARM EABI 64-bit syscall's arguments decoding. * Fixed semtimedop decoding on s390. * Fixed osf_sigprocmask decoding on alpha. * Fixed ipc and socket subcall decoding on several architectures. * Corrected syscall entries for epoll_pwait, epoll_create, epoll_ctl, epoll_wait, mincore, mlockall, prctl, reboot, sendfile, sendfile64, sendmsg, sgetmask, ssetmask, swapon, tgkill and tkill syscalls. * Corrected io_* syscall entries on ARM. * Fixed PID prefix printing in "strace -oLOG -ff -p1 -p2 -p3" case. * Fixed logging of unfinished lines in "strace -oLOG -ff" case. * Fixed build when libaio-devel is not available. * Fixed configure checks for PTRACE_* constants. * Fixed compilation warnings remained on several architectures. * Portability * Removed all non-Linux code. After years of neglect, that dead code just hampered further strace development. * Linux kernel >= 2.6.18 is recommended. Older versions might still work but they haven't been thoroughly tested with this release. Noteworthy changes in release 4.6 (2011-03-15) ============================================== * Changes in behavior * Print diagnostic information about changes in personality mode to standard error instead of standard output. * Improvements * Implemented a new method of following clone, fork, and vfork syscalls using the Linux kernel's explicit facilities for tracing creation of threads and child processes. * Implemented CLONE_PARENT and CLONE_UNTRACED flags handling. * Implemented decoding of TLS syscalls on m68k. * Implemented biarch support on powerpc64. * Implemented biarch support for getrlimit() and setrlimit(). * Implemented decoding of struct ucred in getsockopt SO_PEERCRED. * Implemented SOL_SCTP socket options decoding. * Added HDIO_* ioctl names. (Addresses Debian bug #450953). * Added LOOP_* ioctl names. * Updated lists of CLOCK_*, CLONE_*, MS_*, and SOL_* constants to match Linux 2.6.37. * Updated the list of IPPROTO_* constants to match netinet/in.h. * Implemented decoding of HDIO_* and BLK* ioctls. * Added MicroBlaze architecture support. * Added new syscall entries to match Linux 2.6.37. * Regenerated list of ioctl names from Linux 2.6.37. * Enhanced signal notification decoding. * Documented -C and -D options. * Bug fixes * Fixed fetching syscall arguments on m68k. * Fixed an error when judging whether a process has children. * Fixed get/set_robust_list syscall numbers for powerpc. * Fixed a corner case in printing clone flags. * Fixed cross-compiling issues. * Fixed build issues on powerpc64, SH and SPARC. * Fixed syscall flags of fstatat*, mmap, mmap2, fadvise64*, swapoff, fgetxattr, flistxattr, fremovexattr, epoll_create, fallocate, fanotify_init, and fanotify_mark syscalls. * Fixed decoding of get[ug]id, gete[ug]id and setfs[ug]id return values. * Fixed biarch support in IO dumping. * Fixed raw exit_group decoding. * Fixed decoding of file descriptors on 64-bit architectures. * Fixed a corner case in waitpid handling. (Addresses Red Hat bug #663547). * Fixed stat64 decoding on mips (Addresses Debian bug #599028). * Fixed misleading italics in the manual page. (Addresses Debian bug #589323). Noteworthy changes in release 4.5.20 (2010-04-13) ================================================= * Improvements * Implemented decoding of new linux syscalls: inotify_init1, recvmmsg. * Implemented basic decoding of new linux syscalls: preadv, pwritev, rt_tgsigqueueinfo, perf_event_open. * Enhanced decoding of recently added syscalls on non-x86 architectures by replacing a bare decoder with elaborate parsers enabled earlier for x86/x86-64. * Implemented -C option to combine regular and -c output. (Addresses Debian bug #466196) * Enhanced decoding of mbind and mremap syscalls. * Enhanced SOL_PACKET socket options decoding. * Regenerated list of ioctl names from linux 2.6.33. * Added TILE architecture support. * Bug fixes * Fixed build with Linux kernel headers 2.6.32-rc5+. (Addresses Debian bug #560516 and Fedora bug #539044) * Fixed build on mips. * Fixed handling of Linux systems without struct statfs64. * Fixed reporting signal mask by sigreturn on powerpc. * Fixed potential stack buffer overflow in select decoder. (Addresses Fedora bug #556678) * Corrected msgsnd indirect ipccall decoding. * Corrected decoding of 64bit syscalls. (Addresses Debian bug #570603) * Corrected getsockopt decoding on architectures where sizeof(long) > sizeof(int). (Addresses Debian bug #494844) * Corrected decoding of epoll_pwait. (Addresses Debian bug #513014) * Corrected handling of killed threads. Noteworthy changes in release 4.5.19 (2009-10-21) ================================================= * Changes in behavior * When command exits, strace now exits with the same exit status. If command is terminated by a signal, strace terminates itself with the same signal, so that strace can be used as a wrapper process transparent to the invoking parent process. When using -p option, the exit status of strace is zero unless there was an unexpected error in doing the tracing. (Addresses Fedora bug #105371 and Debian bug #37665) * Improvements * Implemented decoding of new Linux syscalls: accept4, dup3, epoll_create1, eventfd2, inotify_init1, pipe2, signalfd4. * Implemented decoding of socket type flags introduced in Linux 2.6.27. * Implemented decoding of accept4 socketcall. * Enhanced prctl decoding. * Enhanced nanosleep decoding. * Enhanced ptrace decoding. * Enhanced futex decoding. * Enhanced CAP_* decoding. * Enhanced SIOCS* ioctls decoding. * Enhanced fcntl F_* flags decoding. * Enhanced semop/semtimedop decoding. * Updated ARM architecture support. * Added Blackfin architecture support. * Added AVR32 architecture support. * Added CRIS architecture support. * Made strace detect when traced process suddenly disappeared. * Bug fixes * Fixed syscall numbers for tee and sync_file_range. (Addresses Debian bug #503124) * Fixed several bugs in strings decoder, including potential heap memory corruption. (Addresses Fedora bugs #470529, #478324 and #511035) * Marked sendfile(2) as a network syscall. (Addresses Debian bug #509499) * Fixed accept(2) decoding. (Addresses Debian bug #507573) * Fixed sigtimedwait(2) decoding. * Fixed build on ARM EABI. (Addresses Debian bugs #520084 and #535564, and Fedora bug #507576) * Fixed display of 32-bit fcntl(F_SETLK) on 64-bit architectures. (Addresses Red Hat bug #471169) * Fixed display of 32-bit argv array on 64-bit architectures. (Addresses Fedora bug #519480) * Fixed display of 32-bit struct sigaction on 64-bit architectures. * Fixed HPPA architecture support. (Addresses Debian bugs #437928 and #546619) Changes in 4.5.18 ============== * Bug fixes. * Support new Linux/PPC system call subpage_prot and PROT_SAO flag. * In sigaction system call, display sa_flags value along with SIG_DFL/SIG_IGN. Changes in 4.5.17 ============== * Many bug fixes. * -F is now deprecated, -f has traced vfork too on Linux for a long time now. * Print O_CLOEXEC, MSG_CMSG_CLOEXEC flag bits. * Improved output for prctl system call on Linux. * Improved support for Linux/ARM. * SA_NOMASK is now spelled SA_NODEFER, and SA_ONESHOT is spelled SA_RESETHAND. Changes in 4.5.16 ============== * Bug fixes. * Improved output for delete_module, futex, and mbind system calls on Linux. * Improved output for SG_IO ioctls on Linux. * Support new Linux system calls move_pages, utimensat, signalfd, timerfd, eventfd, getcpu, epoll_pwait. Changes in 4.5.15 ============== * Bug fixes. * Several biarch improvements. * Improved output for adjtimex, sysctl, quotactl, mount, umount. * Support new Linux system calls *at, inotify*, pselect6, ppoll and unshare. Changes in 4.5.14 ============== * Bug fixes. * Accept numeric system calls in -e. Changes in 4.5.13 ============== * Bug fixes. * Introduce "-e trace=desc". Changes in 4.5.12 ============== * Bug fixes. * Better x86-64 support for IA32 processes. * Update PowerPC system calls. * Better printing for Linux aio system calls. Changes in 4.5.11 ============== * Quick fix release for build issues. * One fix for Linux/ARM system call table. Changes in 4.5.10 ============== * Bug fixes. * Print fault address for SIGSEGV/SIGBUS signals when available. Changes in 4.5.9 ============== * Bug fixes. * Improve socket ioctl printing. * Update Linux/IA64 syscall list. * Fix Linux/x86-64 syscall argument extraction for 32-bit processes. * Improve mount flags printing. * Support symbolic printing of x86_64 arch_prctl parameters. Changes in 4.5.8 ============== * Bug fixes. * Update syscall tables for Alpha, ARM, HPPA. * Support new Linux syscalls mbind, set_mempolicy, get_mempolicy, waitid. * Support Linux syscalls fadvise64, fadvise64_64, and epoll_*. * Improve ioctl command name matching. * Print RTC_* ioctl structure contents. * Support newer RLIMIT_* values. * Print struct cmsghdr details in sendmsg. Changes in 4.5.7 ============== * Bug fixes. * Print attribute values in *xattr system calls on Linux. * Include pread and pwrite calls in -e read and -e write tracing. * Update SO_* and IP_* value lists and add IPV6_* values for socket options. * Print clock_t values symbolically in Linux clock_* system calls. Changes in 4.5.6 ============== * Bug fixes, Linux ioctl updates. * David Miller contributed support for Linux/SPARC64. Changes in 4.5.5 ============== * Just bug fixes. Changes in 4.5.4 ============== * Update Linux ioctl lists. * Update PF_* and AF_* value lists. * The 4.5.3 -p behavior for NPTL threads applies only under -f, and got fixed. Changes in 4.5.3 ============== * Bug fixes. * On Linux using NPTL threads, -p will now attach to all threads in a process. * Handle new mq_* system calls in Linux 2.6.6 and later. Changes in 4.5.2 ============== * Bug fixes. * Report some new VM_* bit values on Linux. * Better output for Linux sched_* system calls. Changes in 4.5.1 ============== * Bug fixes. * Display multiple ioctl name matches on Linux. Changes in 4.5 ============== * New port to AMD's x86-64 architecture. One strace binary can handle both new x86-64 and old i386 processes. * Fixed support for LFS64 calls. * New switch -E to add/remove environment variables for the command. * Merged s390/s390x port. * Trace an unbounded number of processes. * Handle numerous new system calls in Linux 2.5, and new threads semantics. * Fixed bugs with attach/detach leaving things stopped. * Fixed traced process seeing ECHILD despite live, traced children in waitpid calls with WNOHANG. * Stuart Menefy contributed a port to Linux/SH. * Stephen Thomas contributed a port to Linux/SH64. * Many other bug fixes. Changes in 4.4 ============== * Fix Linux/ia64 support, looks like someone renamed a few things on us * Fix the ioctl setup for Linux, turned out it did not really work. Improve the ioctl extracter as well so we decode some more ones. Changes in 4.3.1 ================ * compile fixes for Linux/mips Changes in 4.3 ============== * Linux ia64 and hppa ports added * The usual Linux syscall updates (includes 32bit uid/gid support), * Linux ioctl list updated * Support IPv6 scope ids * FreeBSD/i386 port added * UnixWare and Solaris updates * Better support for tracing multithreaded processes in Linux Changes in 4.2 ============== * Compiles on glibc2.0 systems again * Linux/S390 port added * The usual Linux syscall updates * we can follow fork on arm now Changes in 4.1 ================ * Linux/MIPS port added * Lots of Linux updates again * Improved IPv6 support * Add strace-graph Changes in 4.0.1 ================ * Minor bugfixes * Compiles on glibc2.0 systems again Changes in 4.0 ============== * Get stat structure properly on Linux 64bit archs * Personalities work again * Compile correctly on SunOS again * IRIX64 updates * Solaris updates Changes in 3.99.1 ================= * Linux (ultra)sparc fixes * Linux alpha fixes * Minor cleanups Changes in 3.99 =============== * New maintainer * add support for more Linux architectures (powerpc, sparc, arm) * support lots more Linux syscalls * fix signal handling * add IPX and IPIP support * check stray syscall after execv * fix hanging children Changes in version 3.1 ====================== * Irix5 is supported * Linux 68k is supported * Linux alpha is supported * configure is upgraded to autoconf 2.x * using -f in combination with -e now works correctly * output can be piped to a program * tracing setuid programs works better * it is now reasonable to install strace setuid to root in some circumstances * new useful tracing names like file and process to trace whole classes of system calls, e.g. -efile traces all system calls that take a file name as an argument * IPC calls on SunOS 4.1.x are decoded * Linux program memory is reliably dereferenced * Linux decodes at least the name of all syscalls as of pre2.0.4 * various cosmetic changes and bug fixes Changes from versions 2.x to version 3.0 ======================================== * filename arguments are neither abbreviated nor stringified * string arguments are now true C strings using octal instead of hex by default * preprocessor constants are never shortened (e.g. was RDONLY => now O_RDONLY) * by default the output for multiple processes now goes into one file * all structures, vectors, bitsets, etc. use consistent output formats * the -c option now means count calls, -i does what the old -c used to do New Features in version 3.0 =========================== * non-ascii strings can be optionally printed entirely in hex * the output format is readable when mutiple processes are generating output * exit values are printed in an alignment column * is is possible to suppress messages about attaching and detaching * various tracing features can be enabled on a per syscall/signal/desc basis * selective tracing of syscalls * selective printing of syscall structures * selective abbreviation of long structures on a per syscall basis * selective printing of raw syscall arguments and results * selective tracing of signals * selective dumping of all I/O read from file descriptors * selective dumping of all I/O written to file descriptors * optional counting of time, calls, and errors for each syscall