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Noteworthy changes in release ?.? (????-??-??)
==============================================
* Improvements
* Every short option now has a long option alias, which also has enabled
the following improvements:
* Ability to use human-readable settings for -I/--interruptible,
-D/--daemonize options.
* Ability to silence specific messages using -e quiet/--quiet qualifier
(an alias for the -q option).
* Ability to specify selected fd decoding features using
-e decode-fds/--decode-fds qualifier (an alias for the -y option).
* Ability to set precision for the absolute timestamp, relative timestamp,
and syscall time output (using --absolute-timestamps,
--relative-timestamps, and --syscall-times options, respectively).
* Bug fixes
* Fixed build on csky abiv1 architecture.
Noteworthy changes in release 5.5 (2020-02-06)
==============================================
* Improvements
* Added -e trace=%creds option for tracing syscalls related to process
credentials.
* Enhanced decoding of arch_prctl, keyctl, io_uring_register, io_uring_setup,
and perf_event_open syscalls.
* Enhanced decoding of BPF_PROG_LOAD bpf syscall command.
* Updated decoding of clone3 syscall to match Linux 5.5.
* Implemented decoding of TCA_ACT_FLAGS and TCA_STATS_PKT64 netlink
attributes.
* Updated lists of AUDIT_*, BPF_*, CLONE_*, KEY_*, KVM_*, PPC_PTRACE_*,
SCTP_*, STATX_*, TIPC_*, V4L2_*, and *_MAGIC constants.
* Updated lists of ioctl commands from Linux 5.5.
* Enhanced manual page and "strace --help" output.
* Bug fixes
* Fixed stack trace printing for early syscalls when strace is configured
to use libdw backend for stack tracing (addresses Fedora bug #1788636).
* Fixed stack trace caching when --seccomp-bpf option is specified.
* Fixed potentially unaligned access in decoder of SO_TIMESTAMP*_NEW
control messages.
* Fixed decoding of NDA_LLADDR netlink neighbor table attribute.
* Fixed build of mpers support when CFLAGS contains -flto.
* Fixed build on no-MMU architectures.
* Fixed build with glibc-2.31 and Linux kernel headers < 5.3.
* Fixed tests for glibc-2.31.
Noteworthy changes in release 5.4 (2019-11-28)
==============================================
* Improvements
* Implemented -DD and -DDD options that move strace into a separate
process group and session, respectively.
* Enhanced seccomp-bpf tracee syscall filtering support by implementing
new "binary match" BPF program generation strategy and automatically
choosing the strategy that generates the shortest BPF program.
* Implemented decoding of BPF_BTF_GET_NEXT_ID bpf syscall command.
* Enhanced decoding of BPF_MAP_LOOKUP_ELEM bpf syscall command.
* Implemented PTP_CLOCK_GETCAPS2, PTP_EXTTS_REQUEST2, PTP_PEROUT_REQUEST2,
PTP_ENABLE_PPS2, and PTP_SYS_OFFSET2 ioctl decoding.
* Updated lists of BPF_*, CAN_*, KEXEC_*, KVM_*, MADV_*, MSG_*, P_*, PR_*,
PTP_*, SCTP_*, and V4L2_* constants.
* Implemented ability to build ARM EABI mpers support using a separate
compiler on aarch64.
* Updated lists of ioctl commands from Linux 5.4.
* Enhanced manual page.
* Bug fixes
* Fixed -b execve when --seccomp-bpf option is specified.
* Fixed decoding of BPF_PROG_LOAD bpf syscall command.
* Fixed build on no-MMU architectures.
* Fixed build on antique systems that do not provide necessary definitions
of AUDIT_ARCH_* constants.
Noteworthy changes in release 5.3 (2019-09-25)
==============================================
* Improvements
* Implemented usage of seccomp-bpf for stopping tracees only for filtered
syscalls. Use --seccomp-bpf option to enable.
* Implemented decoding of pidfd_open and clone3 syscalls.
* Enhanced decoding of io_cancel, io_submit, s390_sthyi, and syslog syscalls.
* Enhanced decoding of NETLINK_ROUTE protocol.
* Implemented decoding of UNIX_DIAG_UID netlink attribute.
* Implemented decoding of WDIOC_* ioctl commands.
* Enchanced syscall count statistics: overhead is now applied per-call,
added ability for sorting on errors field.
* Syscall delay injection and overhead values can now be supplied with
time measure unit suffix and provided in IEEE 754 floating point format.
* Updated lists of AUDIT_*, BPF_*, ETH_*, KEYCTL_*, KVM_*, MAP_*, SO_*, TCP_*, V4L2_*,
XDP_*, and *_MAGIC constants.
* Updated lists of ioctl commands from Linux 5.3.
* Enhanced manual page.
* Bug fixes
* Fixed syscall tampering on arc, avr32, csky, ia64, m68k, metag, mips,
nios2, or1k, riscv, s390, s390x, sparc, sparc64, and tile architectures
when PTRACE_GET_SYSCALL_INFO is in use.
* Fixed decoding of sockaddr_hci (AF_BLUETOOTH) addresses that lack
hci_channel field.
* Fixed evdev ioctl bitset decoding.
* Fixed tests on alpha with Linux kernel headers 5.1+.
* Portability
* Removed support for decoding syscalls in range [1024...1079] on AArch64
architecture as this range has never been implemented in mainline kernel
releases.
Noteworthy changes in release 5.2 (2019-07-12)
==============================================
* Improvements
* Implemented syscall return status filtering with -e status=set option
and its aliases: -z (limit syscall printing to successful syscalls only)
and -Z (limit syscall printing to failed syscalls only). Addresses Debian
bug #176376.
* Implemented decoding of open_tree, move_mount, fsopen, fsconfig, fsmount,
and fspick syscalls.
* Enhanced decoding of bpf, clone, inotify_init, mbind, and set_mempolicy
syscalls.
* Updated lists of AT_*, AUDIT_*, BPF_*, CLONE_*, ETH_*, KEY_*, KVM_*, MPOL_*,
TIPC_*, and V4L2_* constants.
* Updated lists of ioctl commands from Linux 5.2.
* Bug fixes
* Fixed syscall tampering on powerpc and powerpc64 when
PTRACE_GET_SYSCALL_INFO is in use.
* Fixed build with cutting-edge toolchain.
Noteworthy changes in release 5.1 (2019-05-22)
==============================================
* Bug fixes
* Fixed decoding of last two arguments of clone syscall on riscv.
* Improvements
* Added C-SKY architecture support.
* Implemented decoding of SO_TIMESTAMP*_NEW control messages.
* Implemented decoding of clock_gettime64, clock_settime64, clock_adjtime64,
clock_getres_time64, clock_nanosleep_time64, timer_gettime64,
timer_settime64, timerfd_gettime64, timerfd_settime64, utimensat_time64,
pselect6_time64, ppoll_time64, io_pgetevents_time64, recvmmsg_time64,
mq_timedsend_time64, mq_timedreceive_time64, semtimedop_time64,
rt_sigtimedwait_time64, futex_time64, sched_rr_get_interval_time64,
pidfd_send_signal, io_uring_setup, io_uring_enter, and io_uring_register
syscalls.
* Enhanced decoding of bpf syscall.
* Wired up getegid, geteuid, getppid, io_pgetevents, statfs64, and fstatfs64
syscalls on alpha.
* Wired up kexec_file_load and migrate_pages syscalls on arm.
* Wired up io_pgetevents, perf_event_open, seccomp, and statx syscalls
on ia64.
* Wired up seccomp syscall on m68k.
* Wired up statx syscall on sh.
* Wired up pkey_mprotect, pkey_alloc, and pkey_free syscalls on alpha, hppa,
ia64, m68k, s390, s390x, sh, sparc, and sparc64.
* Wired up rseq syscall on alpha, hppa, ia64, m68k, sh, sparc, sparc64,
and xtensa.
* Wired up direct ipc syscalls on m68k, mips o32, powerpc, powerpc64,
s390, s390x, sh, sparc, sparc64, and x86.
* Updated lists of BPF_*, FAN_*, F_SEAL_*, IPV6_*, NT_*, PR_SPEC_*, SO_*,
and V4L2_* constants.
* Updated lists of ioctl commands from Linux 5.1.
Noteworthy changes in release 5.0 (2019-03-19)
==============================================
* Changes in behavior
* -D option now implies -I4: by default strace ignores SIGHUP, SIGINT,
SIGQUIT, SIGPIPE, SIGTERM, SIGTTIN, SIGTTOU, and SIGTSTP when -D option
is used.
* Diagnostic message is no longer printed if an attempt to restart a process
has failed with ESRCH. (Addresses RHBZ bug #1662936.)
* ASCII dump no longer tries to read the whole buffer at once. As result,
it can fail with a diagnostic message after dumping only a part.
Amount of preceding zeroes printed for offset is now chosen in a way
to accommodate all the digits of all the offsets being printed.
* Improvements
* Changed the way tracees are handled: all pending tracees are now waited for
before further processing, this improves fairness of tracee processing.
(Addresses RHBZ bugs #478419, #526740, #851457, #1609318, #1610774,
and maybe some others.)
* Enhanced xlat styles support configured by -X option.
* Enhanced decoding of bpf syscall.
* Enhanced decoding of PTRACE_PEEKUSER and PTRACE_POKEUSER on hppa.
* Enhanced pid formatting in strace-log-merge output.
* Wired up kexec_file_load and rseq syscalls on aarch64, arc, metag, nios2,
or1k, riscv, and tile architectures.
* Updated lists of BPF_*, BTRFS_*, FAN_*, IFLA_*, KERN_*, KVM_CAP_*, NDA_*,
NETNSA_*, NT_*, PR_*, REL_*, SECCOMP_*, SCTP_*, UDP_*, V4L2_*, and *_MAGIC
constants.
* Updated lists of ioctl commands from Linux 5.0.
* Bug fixes
* Fixed ordering of sockaddr_in6 fields.
* Fixed strace-k test on alpha.
* Fixed build on mips o32.
* Fixed build on NOMMU architectures.
* Fixed build in --with-libiberty=yes mode.
* Fixed potential NULL dereference during printing of line continuation
for syscalls that haven't been decoded.
* Fixed strace-log-merge error diagnostics.
Noteworthy changes in release 4.26 (2018-12-26)
===============================================
* License
* The test suite is now provided under the terms of
the GNU General Public License version 2 or later.
* All the rest of strace is now provided under the terms of
the GNU Lesser General Public License version 2.1 or later.
* Changes in behavior
* If strace is interrupted by a signal it handles (currently
one of HUP, INT, QUIT, PIPE, or TERM), strace terminates
itself with this signal.
* Improvements
* Implemented obtainment of system call information using
PTRACE_GET_SYSCALL_INFO ptrace API.
* Implemented decoding of PTRACE_GET_SYSCALL_INFO ptrace request.
* Implemented decoding of BLKGETZONESZ, BLKGETNRZONES, and RND* ioctl
commands.
* Enhanced xlat styles support configured by -X option.
* Enhanced internet address formatting in structureless contexts.
* Enhanced decoding of getsockopt SO_ERROR option.
* Enhanced error diagnostics when the first exec fails.
* Added %net as a short form of %network in syscall specifications.
* Updated lists of ABS_*, BPF_*, FAN_*, IFA_*, IFLA_*, KVM_CAP_*, NETLINK_*,
NTF_*, PR_SPEC_*, REL_*, SOL_*, TCA_*, and V4L2_* constants.
* Updated lists of ioctl commands from Linux 4.20.
* Enhanced manual page.
* Bug fixes
* Fixed "xlat_idx: Unexpected xlat value 0" warnings.
* Fixed sthyi output format on s390.
* Documented -X option in strace -h output.
Noteworthy changes in release 4.25 (2018-10-30)
===============================================
* Improvements
* Implemented decoding of KVM_CHECK_EXTENSION and NBD_* ioctl commands.
* Implemented decoding of SOL_XDP socket option names.
* Implemented decoding of AF_PACKET protocols in socket syscall.
* Implemented decoding of AF_AX25 and AF_X25 addresses, protocols,
and options.
* Implemented stack trace printing on receiving signals.
* Enhanced xlat styles support configured by -X option.
* Enhanced decoding of IFLA_*, NETCONFA_*, and SMC_DIAG_* netlink attributes.
* Wired up io_pgetevents syscall on arm, sparc, and sparc64.
* Updated lists of AF_*, AUDIT_*, BPF_*, IFLA_*, IN_*, IPSTATS_*,
IPV4_DEVCONF_*, NT_*, SCTP_*, SO_*, SOCK_*, SOL_*, and V4L2_* constants.
* Updated lists of ioctl commands from Linux 4.19.
* Bug fixes
* Fixed decoding of bit sets in evdev ioctl commands.
* Fixed decoding of EVIOCGBIT(0, ...) ioctl commands.
* Fixed test suite for the case when mlockall and unimplemented syscalls
are explicitly disabled by a seccomp filter.
Noteworthy changes in release 4.24 (2018-08-14)
===============================================
* Improvements
* Implemented decoding of kvm vcpu exit reason (-e kvm=vcpu option),
requires Linux kernel version 4.16.0 or higher.
* Implemented decoding of KVM_SET_CPUID2 and KVM_GET_*_CPUID ioctl commands.
* Enhanced decoding of corner cases of SO_LINGER, SO_PEERCRED,
and PACKET_STATISTICS getsockopt options.
* Wired up io_pgetevents and rseq syscalls on hppa, microblaze, mips, powerpc,
and s390.
* Updated lists of AUDIT_*, BPF_*, IFA_*, IFLA_*, RTA_*, RTPROT_*, TCP_*,
TRAP_*, and UDP_* constants.
* Updated lists of ioctl commands from Linux 4.18.
* Bug fixes
* Fixed decoding of Q_XGETQSTAT on non-native personalities.
* Fixed race condition in aio test.
* Fixed build with Bionic libc.
* Fixed build with glibc-2.28.
* Fixed build in exotic systemd-nspawn based environments.
* Fixed build on s390 with kernel headers that do not contain Linux commit
v3.10-rc1~201^2~11.
Noteworthy changes in release 4.23 (2018-06-14)
===============================================
* Changes in behaviour
* On x32 personality, 64-bit syscalls (such as readv) are now shown with "#64"
suffix instead of "64:" prefix. Unlike the old names, these new names
can be used in syscall qualification expressions.
* Changed error number output format: error numbers are consistently
printed as "-1 ECONST (Error description)"
for known errors and as "-1 (errno 123)" for unknown errors,
regardless of -e raw qualification settings. One can specify
-X raw for displaying raw error numbers unconditionally.
* Unfetchable addresses inside arrays are now printed as comments.
* Obsolete IA-32 mode syscall names are no longer printed on ia64.
* Improvements
* Implemented libdw backend for -k option, configured at build time
using --with-libdw option.
Whether -k option is compiled is now configured at build time
using --enable-stacktrace option.
* Added -X option for configuring xlat output formatting (addresses
Debian bug #692915).
* Added support for personality designation ("64", "32", or "x32") to syscall
qualifications in -e trace expressions.
* Implemented injection of syscalls with no side effects as an alternative
to injection of an invalid syscall (-e inject=SET:syscall= expression).
* Improved support for reproducible builds (addresses Debian bug #896016).
* Implemented decoding of BPF_PROG_QUERY and BPF_RAW_TRACEPOINT_OPEN bpf
syscall commands.
* Implemented decoding of INOTIFY_IOC_SETNEXTWD and PERF_EVENT_IOC_* ioctl
commands.
* Implemented decoding of PR_GET_SPECULATION_CTRL and PR_SET_SPECULATION_CTRL
prctl syscall options.
* Enhanced decoding of bpf, getsockopt, setsockopt, and socket syscalls.
* Enhanced decoding of NETLINK_KOBJECT_UEVENT and NETLINK_ROUTE protocols.
* Enhanced decoding of *_DIAG_MEMINFO netlink attributes.
* Enhanced decoding of BTRFS_*, FS_IOC_*, SIOCGIFHWADDR, and SIOCSIFHWADDR
ioctl commands.
* Enhanced decoding of AF_BLUETOOTH socket addresses.
* Implemented decoding of io_pgetevent syscall.
* Wired up rseq syscall.
* Updated lists of ADJ_*, BPF_*, BPF_F_*, BPF_PROG_TYPE_*, ETH_P_*, FPE_*,
IFF_*, IPPROTO_*, MAP_*, MS_*, MSG_*, NETLINK_*, PACKET_*, PROT_*, SCTP_*,
SECCOMP_FILTER_FLAG_*, SEGV_*, SEM_*, SHM_*, SW_*, V4L2_CID_*,
V4L2_CTRL_CLASS_*, and V4L2_PIX_FMT_* constants.
* Updated lists of ioctl commands from Linux 4.17.
* Bug fixes
* Fixed decoding of msgtyp argument of msgrcv syscall.
* Fixed fallback definitions for F_*, MCL_*, MSG_ZEROCOPY, SI_*,
and SOL_SOCKET constants.
* Fixed -e trace=%pure expression on mips.
Noteworthy changes in release 4.22 (2018-04-05)
===============================================
* Changes in infrastructure
* The mailing list was moved to [email protected].
* SourceForge git repository
(https://sourceforge.net/p/strace/code/ci/master/tree/) is no longer
maintained. Please use GitLab (https://gitlab.com/strace/strace/)
or GitHub (https://github.com/strace/strace/) repository instead.
* Changes in behaviour
* When printing string data, '8' and '9' following an octal escape sequence
no longer lead to unabbreviated octal escape sequence output, as they used
to do.
* Angle brackets are now printed as octal number escape sequences
in the output of paths associated with file descriptors.
* Data dump for write syscalls (-e write) is performed regardless
of successfulness of these syscall (addresses Debian bug #436284).
* -r and -t options are now affect output independently. Previously,
-r option led to ignoring of the -t option (addresses Debian bug #466195).
* Improvements
* Implemented delay injection (-e inject=SET:delay_enter= and
-e inject=SET:delay_exit= options).
* Added -A option for opening output files in append mode
(addresses Debian bug #528488).
* IPv6 addresses shown in socket information in -yy mode are now printed
in brackets.
* Enhanced decoding of bpf, prctl and ptrace syscalls.
* Enhanced decoding of BTRFS_IOC_INO_PATHS, BTRFS_IOC_LOGICAL_INO, and PTP_*
ioctl commands.
* Enhanced NETLINK_ROUTE protocol decoding.
* Updated lists of signal codes.
* Updated lists of BPF_*, BTN_*, ETH_P_*, INET_DIAG_BC_*, KEY_*, POLL*, RWF_*,
SCHED_FLAG_*, SCTP_* and error constants.
* Implemented block/character device number printing in -yy mode.
* Known pixel/SDR format names are printed as comments for pixelformat fields
in v4l2 structures.
* Enhanced decoding of kern_features syscall.
* Enhanced NETLINK_NETFILTER netlink protocol decoder.
* Optimized handling of large number of tracees.
* Improved wall clock time measurement in syscall count statistics
(-c -w option).
* Extended the range of allowed values in -e inject=...:retval= expression.
* Added i18n support.
* Updated lists of ioctl commands from Linux 4.16.
* Enhanced manual page.
* Bug fixes
* Fixed build on m68k.
* Fixed v4l2 pixelformat decoding on big-endian architectures.
* Fixed -O option.
Noteworthy changes in release 4.21 (2018-02-13)
===============================================
* Changes in behaviour
* Warning is now issued when -F option is used.
* Warning is now issued when a tracee with unsupported personality
is attached.
* Unknown syscall numbers are now printed in hexadecimal form.
* Improvements
* Implemented decoding of netlink descriptor attributes as file descriptors.
* Implemented decoding of hugetlb page size selection flags.
* Implemented decoding of BPF_PROG_TEST_RUN, BPF_PROG_GET_NEXT_ID,
BPF_MAP_GET_NEXT_ID, BPF_PROG_GET_FD_BY_ID, BPF_MAP_GET_FD_BY_ID,
and BPF_OBJ_GET_INFO_BY_FD commands of bpf syscall.
* Enhanced decoding of get_thread_area, memfd_create, modify_ldt,
perf_event_open, reboot, s390_guarded_storage, s390_pcio_mmio_read,
s390_pci_mmio_write, s390_runtime_instr, s390_sthyi, set_thread_area,
and shmget syscalls.
* Implemented decoding of KVM_* and DM_LIST_DEVICES ioctl commands.
* Implemented decoding of riscv_flush_icache syscall.
* Enhanced decoding of getsockopt and setsockopt syscalls for SOL_NETLINK
level.
* Enhanced decoding of BPF_MAP_CREATE command of bpf syscall.
* Print values returned by mq_open syscall and first arguments
of mq_getsetattr, mq_notify, mq_timedreceive, and mq_timedsend syscalls
as file descriptors.
* Added decoding of get_tls syscall on arm.
* Added -e trace=%pure option for tracing system calls with no arguments that
never fail.
* Updated lists of IPV6_*, MAP_*, MEMBARRIER_CMD_*, MSG_*, NT_*, PKEY_*,
SHM_*, and TCP_* constants.
* Added manual page for the strace-log-merge command.
* Updated lists of ioctl commands from Linux 4.15.
* Implemented biarch support for s390x.
* Implemented an optional support for symbol demangling in strace -k output
(activated by --with-libiberty configure option).
* Information about availability of demangling and reliable personality
decoding (on architectures with multiple personalities) is now available
in strace -V output.
* Added decoding of pkey_alloc, pkey_free, and pkey_mprotect syscalls on
powerpc and powerpc64.
* Enhanced manual page.
* Bug fixes
* Fixed multi-personality support in cross builds.
* Added mq_getsetattr, mq_notify, mq_open, mq_timedreceive, and mq_timedsend
syscalls to %desc tracing set.
* Fixed path tracing support for mmap syscalls with indirect arguments and
for old select syscall.
* Fixed decoding of arm-specific (__ARM_NR_*) syscalls.
* Fixed open mode flags decoding.
* Fixed corner cases in handling of strace -ff -ttt logs by strace-log-merge.
* Error counts that exceed one billion are now printed correctly in call
summary output.
* Fixed call summary header for x32 personality.
* Changes of tracee personalities are reported more reliably.
* Fixed the case when strace attaches to a tracee being inside exec and its
first syscall stop is syscall-exit-stop instead of syscall-enter-stop,
which messed up all the syscall state tracking.
* Fixed printing of higher 32 bits of the return value for x32 personality.
* Portability
* A C compiler that supports "for" loop initial declarations is now required.
* Inability to configure multiple personality support on architectures where
multiple personalities are supported leads to configuration failure during
build now. Use --enable-mpers=check to revert to the old behaviour.
* Build-time requirement for the mpers support has been lowered from gawk 4
to gawk 3.
* Removed incomplete and non-functional support for the CRIS architecture.
* Removed incomplete and unused support for IA-32 mode on the IA-64
architecture.
Noteworthy changes in release 4.20 (2017-11-13)
===============================================
* Improvements
* Implemented decoding of NETLINK_NETFILTER netlink message types and flags.
* Implemented decoding of SECCOMP_GET_ACTION_AVAIL operation of seccomp
syscall.
* Updated lists of ARPHRD_*, BPF_*, ETH_P_*, LOOP_*, MADV_*,
MEMBARRIER_CMD_*, MFD_*, SECCOMP_*, SO_*, SOL_*, TCP_*, and UFFD_FEATURE_*
constants.
* Added decoding of statx syscall on hppa.
* Updated lists of ioctl commands from Linux 4.14.
* Bug fixes
* Fixed powerpc personality support on powerpc64.
Noteworthy changes in release 4.19 (2017-09-05)
===============================================
* Changes in behaviour
* Changed formatting of personality names on tile architecture in order
to make it in line with other multi-personality architectures.
* Changed field output order in struct v4l2_requestbuffers to improve in/out
field formatting.
* Changed handling of multiple signal= specifications in an injection
expression: multiple specification now leads to error instead of implicit
usage the last specification.
* Improvements
* Enhanced decoding of optlen argument of getsockopt syscall.
* Enhanced decoding of SO_LINGER option of getsockopt and setsockopt syscalls.
* Enhanced decoding of SO_PEERCRED option of getsockopt syscall.
* Enhanced decoding of IP_ADD_MEMBERSHIP, IP_DROP_MEMBERSHIP,
IPV6_ADD_MEMBERSHIP, IPV6_DROP_MEMBERSHIP, IPV6_JOIN_ANYCAST,
IPV6_LEAVE_ANYCAST, MCAST_JOIN_GROUP, and MCAST_LEAVE_GROUP options
of setsockopt syscall.
* Enhanced decoding of KEYCTL_DH_COMPUTE operation of keyctl syscall
(KDF parameters decoding).
* Implemented decoding of KEYCTL_RESTRICT_KEYRING operation of keyctl syscall.
* Enhanced decoding of UFFDIO_API ioctl command.
* Enhanced decoding of BPF_PROG_LOAD, BPF_MAP_CREATE, BPF_MAP_LOOKUP_ELEM,
and BPF_MAP_GET_NEXT_KEY commands of bpf syscall.
* Implemented decoding of linux socket filter programs specified
for SO_ATTACH_FILTER and SO_ATTACH_REUSEPORT_CBPF socket options.
* Implemented decoding of inet_diag_req_v2, inet_diag_req_compat,
packet_diag_msg, and smc_diag_msg netlink attributes of NETLINK_SOCK_DIAG.
* Implemented NETLINK_SELINUX protocol specific decoding.
* Implemented decoding of netlink message ack flags.
* Implemented decoding of nlmsgerr netlink attributes.
* Implemented basic protocol specific decoding of NETLINK_CRYPTO.
* Implemented decoding of crypto_user_alg netlink attributes
of NETLINK_CRYPTO.
* Implemented basic protocol specific decoding of addr, addrlabel, dcb, link,
mdb, neigh, neightbl, netconf, nsid, route, rule, tc, and tca messages
of NETLINK_ROUTE.
* Implemented decoding of NETLINK_KOBJECT_UEVENT messages.
* Improved handling of unexpected tracees (the ones that cloned with
CLONE_PARENT/CLONE_PTRACE or called PTRACE_TRACEME on themselves): they
are now PTRACE_DETACH'ed instead of PTRACE_CONT'ed.
* Updated lists of BPF_*, KEY_*, RWF_*, SCM_*, SO_*, and *_MAGIC constants.
* Added decoding of arch_prctl syscall on x86.
* Added decoding of seccomp, bpf, userfaultfd, membarrier, mlock2,
copy_file_range, preadv2, pwritev2, and statx on alpha.
* Added decoding of statx syscall on microblaze.
* Added decoding of s390_guarded_storage syscall on s390.
* Updated lists of ioctl commands from Linux 4.13.
* Enhanced manual page.
* Bug fixes
* Fixed printing of group_req structure on non-native personalities.
* Fixed output formatting of blkpg_ioctl_arg, dm_name_list, and iocb
structures.
* Fixed formatting of nul-terminated strings which have kernel-imposed size
limit.
* Fixed printing of paths that hit PATM_MAX limit in order to match kernel's
behaviour.
* Fixed build warnings on Android mips64.
* Fixed unused function "is_negated_errno" build warning when built
with clang.
* Fixed syscall number and arguments retrieval behaviour on sparc64 and
mips o32 after prctl(PR_SET_DUMPABLE, 0) makes PTRACE_PEEKTEXT impossible
to use if Linux kernel has commit v4.10-rc1~114^2~2.
* Fixed path tracing for execveat, symlink, symlinkat, inotify_add_watch,
and inotify_init syscalls.
* Fixed personality switch printing on sparc64 and risc-v.
Noteworthy changes in release 4.18 (2017-07-05)
===============================================
* Improvements
* Implemented decoding of SCM_TIMESTAMP* control messages.
* Implemented decoding of netlink NLMSG_DONE messages.
* Implemented decoding of netlink generic nlmsg_type and nlmsg_flags.
* Implemented decoding of NETLINK_AUDIT, NETLINK_NETFILTER, NETLINK_ROUTE,
NETLINK_SELINUX, NETLINK_SOCK_DIAG, and NETLINK_XFRM message types.
* Implemented decoding of NETLINK_GENERIC protocol families.
* Implemented basic protocol specific decoding of AF_INET, AF_INET6,
AF_NETLINK, AF_PACKET, AF_SMC, and AF_UNIX messages of NETLINK_SOCK_DIAG.
* Implemented basic decoding of netlink attributes.
* Implemented basic protocol specific decoding of AF_INET, AF_NETLINK,
AF_PACKET, AF_SMC, and AF_UNIX netlink attributes of NETLINK_SOCK_DIAG.
* Implemented decoding of inet_diag_msg, netlink_diag_msg, and unix_diag_msg
netlink attributes of NETLINK_SOCK_DIAG.
* Updated lists of ARPHRD_*, KEYCTL_*, NDIAG_SHOW_*, RTM_*, SCM_*, SCTP_*,
SO_*, V4L2_*, and prctl ARCH_* constants.
* Updated lists of ioctl commands from Linux 4.12.
* Bug fixes
* In interactive mode (-I2), those signals that were blocked at startup
will remain blocked for the whole period of strace execution.
* strace no longer resets SIGCHLD handler in tracees to the default action.
* When traced command is terminated by a blocked signal, strace unblocks
that signal to ensure its own termination with the same signal.
* Fixed corner cases in decoding of old sigaction syscall.
* Fixed build with old kernel headers on mips.
* Fixed build on aarch64 and tile with glibc >= 2.26.
* Fixed build on arc and nios2.
Noteworthy changes in release 4.17 (2017-05-24)
===============================================
* Changes in command line syntax
* Syscall classes specified in -e trace= option now have % prefix (like
-e trace=%process). Old style class names without leading % are still
supported, but considered deprecated now.
* Improvements
* Optimized syscall filtering.
* Improved representation of timestamps.
* Enhanced decoding of sched_setattr syscall.
* Added -e trace=%stat option for tracing variants of stat syscall.
* Added -e trace=%lstat option for tracing variants of lstat syscall.
* Added -e trace=%fstat option for tracing variants of fstat and fstatat
syscalls.
* Added -e trace=%%stat option for tracing syscalls used for querying file
status information (stat, lstat, fstat, fstatat, statx, and their
variations).
* Added -e trace=%statfs option for tracing statfs, statfs64 and statvfs
syscalls.
* Added -e trace=%fstatfs option for tracing fstatfs, fstatfs64 and fstatvfs
syscalls.
* Added -e trace=%%statfs option for tracing syscalls used for querying file
system statistics information (statfs-like, fstatfs-like and ustat).
* Added -e trace=/regex option for filtering syscalls using regular
expressions.
* Added support for prepending of question mark before syscall qualification
in -e trace expressions in order to suppress error in case no syscalls
matched the provided qualification.
* Implemented decoding of signal mask in rt_sigreturn syscall on alpha, arc,
arm, avr32, bfin, cris, hppa, m68k, metag, microblaze, mips, nios2, or1k,
powerpc, powerpc64, riscv, sh, sh64, sparc, sparc64, tile, x86, and xtensa
architectures.
* Implemented decoding of statx syscall.
* Implemented decoding of NS_* ioctl commands.
* Implemented decoding of the remaining V4L2_BUF_TYPE_* types.
* Implemented decoding of VIDIOC_[SG]_TUNER ioctl commands.
* Implemented decoding of NLMSG_ERROR netlink messages.
* Improved decoding of BPF_PROG_ATTACH command of bpf syscall.
* Improved decoding of misplaced parts in DM_* ioctl commands.
* Updated lists of ioctl commands from Linux 4.11.
* Bug fixes
* Fixed decoding of flags argument of preadv2 and pwritev2 syscalls on x32.
* Fixed the number of arguments and tracing flags of alpha specific syscalls.
* Fixed decoding of old sigsuspend syscall on alpha, cris, mips, powerpc,
powerpc64, sh, sh64, sparc, and sparc64.
* Fixed decoding of sgetmask and ssetmask syscalls on 64-bit architectures.
* Fixed decoding of netlink messages received within struct msghdr.
* Worked around a bug in miscompiled aarch64 kernels leading to the 3rd
argument of sched_getattr syscall being not quite 32-bit.
* Fixed corner cases of printing inaccessible times argument of utimes
and futimesat syscalls.
Noteworthy changes in release 4.16 (2017-02-14)
===============================================
* Improvements
* Implemented syscall return value injection (-e inject=SET:retval= option).
* Implemented signal injection (-e inject=SET:signal= option).
* Implemented decoding of SUID_DUMP_* constants in PR_[GS]ET_DUMPABLE.
* Implemented decoding of all SG_* ioctl commands.
* Implemented decoding of ustat syscall.
* Implemented decoding of BPF_OBJ_PIN, BPF_OBJ_GET, BPF_PROG_ATTACH,
and BPF_PROG_DETACH commands of bpf syscall.
* Enhanced decoding of sg_io_hdr and sg_io_v4 structures.
* Enhanced decoding of get_robust_list, getrandom, io_submit, set_robust_list
syscalls.
* Enhanced decoding of entities of kernel long type on x32 and mips n32 ABIs.
* Updated lists of IP_*, IPV6_*, and LOOP_* constants.
* Updated lists of ioctl commands from Linux 4.10.
* Added decoding of recently added syscalls on avr32, microblaze, ppc,
and ppc64.
* Bug fixes
* Fixed pathmatch of oldselect syscall on 64-bit architectures.
* Fixed decoding of mmap2 syscall on s390 when arguments are not available.
* Fixed decoding of kexec_file_load, mprotect, pkey_mprotect, prctl, preadv*,
and pwritev* syscalls on x32.
* Fixed printing of string arguments of getxattr and setxattr syscalls
when -s option is used to limit the printed string size.
* Fixed decoding of ifconf, ifreq, and loop_info structures on non-native
personalities.
* Fixed decoding of SG_* and LOOP_* ioctl commands.
* Fixed build on mips with musl libc.
* Fixed cross-building of ioctlsort.
* Applied minor formatting fixes to the manual page.
Noteworthy changes in release 4.15 (2016-12-14)
===============================================
* Changes in behavior
* Time stamps are now printed according to ISO 8601.
* Changed output format of val3 parameter of futex FUTEX_WAKE_OP operation.
* The last argument of mincore, sched_getaffinity, and sched_setaffinity
syscalls is now formatted as an array.
* Improvements
* Implemented syscall fault injection (-e fault=... option).
* Implemented decoding of DM_* ioctl commands.
* Implemented decoding of attr parameter of perf_event_open syscall.
* Implemented decoding of pkey_alloc, pkey_free, and pkey_mprotect syscalls.
* Implemented dumping of mq_timedsend and mq_timedreceive syscalls.
* Implemented decoding of PR_SET_FP_MODE and PR_GET_FP_MODE operations
of prctl syscall.
* Implemented PTRACE_GETREGS API support on m68k.
* Updated lists of ARCH_*, BPF_*, BTRFS_*, FALLOC_*, MS_*, *_MAGIC,
and V4L2_* constants.
* Updated lists of ioctl commands from Linux 4.9.
* Added decoding of recently added syscalls on arc, x32, and xtensa.
* Enhanced manual page.
* Bug fixes
* Fixed corner cases in decoding of exit, exit_group, futimesat, getgroups,
getresuid, init_module, inotify_init1, kcmp, kexec_load, lookup_dcookie,
mq_getsetattr, mq_notify, mq_open, mq_timedreceive, mq_timedsend,
name_to_handle_at, prctl, process_vm_readv, process_vm_writev, setfsuid,
setgroups, setns, unshare, and utimes syscalls.
* Fixed handling of verbose flag in printing of controls array
of struct v4l2_ext_controls.
* Fixed omission of field names in the output of capability, sigaction,
sigevent, statfs, timespec, timeval, and utimbuf structures.
* Fixed printing of unknown syscalls in siginfo structure.
* Fixed decoding of ioctl constants on m68k.
* Fixed cris architecture support.
* Fixed cross build when host compiler does not support the same
set of warning flags as the cross compiler.
* Fixed build on SLE10 and SLE11.
Noteworthy changes in release 4.14 (2016-10-04)
===============================================
* Changes in behavior
* When using -p option without a command and no processes has been attached,
strace exits with exit status 1.
* Improvements
* Added printing of the mode argument of open and openat syscalls
when O_TMPFILE flag is set. (Addresses Fedora bug #1377846).
* Enhanced -e abbrev=set, -e raw=set, and -e verbose=set.
* Enhanced decoding of futex, keyctl, quotactl, timerfd_settime,
and aio family syscalls.
* Implemented fetching of the 7th subcall argument on mips o32.
* Updated lists of BPF_*, ETH_P_*, KEXEC_ARCH_*, SCTP_*, TCP_*, and *_MAGIC
constants.
* Updated lists of ioctl commands from Linux 4.8.
* Added decoding of new syscalls on sh and sh64.
* Added RISC-V architecture support.
* Bug fixes
* Marked io_setup and io_destroy as memory mapping related syscalls.
* Fixed leakage of placeholder descriptors to tracees.
* Fixed printing of mode_t, umode_t, and umask types.
* Fixed decoding of iovec arrays without a limit on total data size.
* Fixed decoding of fadvise64, fallocate, futex, keyctl, quotactl, readahead,
and ipc family syscalls.
* Fixed decoding of invalid syscalls mapped to indirect subcalls.
* Fixed decoding of struct btrfs_ioctl_vol_args_v2 on non-native
personalities.
* Fixed decoding of PTRACE_DETACH on sparc and sparc64.
* Fixed decoding of struct stat64 on sparc64.
* Fixed decoding of uid and gid-related syscalls on sparc64.
* Fixed decoding of the forth argument of semctl syscall on sparc64.
* Fixed values of tty ioctl constants on sparc64.
* Fixed sparc personality support on sparc64.
Noteworthy changes in release 4.13 (2016-07-26)
===============================================
* Improvements
* Implemented a general netlink socket parser.
* Enhanced decoding of socket addresses.
* Enhanced decoding of cmsghdr, msghdr, and mmsghdr structures.
* Enhanced decoding of accept, accept4, bind, getpeername, getsockname,
ipc, recvfrom, recvmsg, recvmmsg, sendto, sendmmsg, and socketcall syscalls.
* Updated lists of AF_*, BPF_MAP_TYPE_*, KEY_*, KEYCTL_*, RWF_*, SS_*,
and *_MAGIC constants.
* Updated lists of ioctl commands from Linux 4.7.
* Bug fixes
* Fixed decoding of pid_t argument of prlimit64 syscall.
* Fixed sign extension issues in the parser of struct rusage.
* Fixed race condition in decoding of timeout argument of recvmmsg and
rt_sigtimedwait syscalls.
* Fixed build with fresh linux kernel headers.
Noteworthy changes in release 4.12 (2016-05-31)
===============================================
* Improvements
* Implemented simultaneous use of -p option and tracing of a command.
(addresses Debian bug #549942).
* Implemented caching of netlink conversations to reduce amount of time
spent in decoding socket details in -yy mode.
* Implemented -yy mode decoding of protocol:portid pairs associated with
netlink socket descriptors.
* Implemented decoding of copy_file_range, preadv2, and pwritev2 syscalls.
* Implemented dumping of preadv, preadv2, pwritev, pwritev2, and vmsplice
syscalls.
* Implemented decoding of BTRFS_* and UFFDIO_* ioctl commands.
* Enhanced decoding of BLK*, EVIOC*, RTC_*, and VIDIOC_* ioctl commands.
* Enhanced decoding of fstatfs, fstatfs64, get_mempolicy, getdents,
getdents64, getgroups, getpriority, kill, mbind, migrate_pages, mknod,
mknodat, personality, poll, ppoll, quotactl, rt_sigpending,
rt_sigqueueinfo, rt_sigtimedwait, rt_tgsigqueueinfo, sched_getaffinity,
sched_setaffinity, seccomp, set_mempolicy, setgroups, setpriority, statfs,
statfs64, tgkill, waitid, and xattr family syscalls.
* Enhanced decoding of getxpid, getxuid, and getxgid syscalls on alpha.
* Enhanced decoding of pipe syscall on alpha, ia64, mips, sh, and sparc.
* Added decoding of bind, listen, and setsockopt direct syscalls on sparc.
* Added decoding of osf_statfs64 and osf_fstatfs64 syscalls on alpha.
* Added decoding of fadvise64 and fadvise64_64 on s390.
* Updated lists of AF_*, BPF_MAP_TYPE_*, CLONE_*, EPOLL*, IPV6_*, MADV_*,
MSG_*, PTRACE_*, SEGV_*, SO_*, SOL_*, *_MAGIC, and quotactl constants.
* Updated lists of ioctl commands from Linux 4.6.
* Bug fixes
* Fixed build on arc, metag, nios2, or1k, and tile architectures.
* Fixed decoding of 32-bit times syscall return value on 64-bit architectures.
* Fixed decoding of mlock2 syscall on sparc.
* Fixed decoding of osf_shmat syscall on alpha.
* Fixed decoding of syscalls unknown to the kernel on s390/s390x.
(addresses Debian bug #485979 and Fedora bug #1298294).
* Fixed decoding of preadv syscall in case of short read.
* Fixed decoding and dumping of readv syscall in case of short read.
* Fixed dumping of recvmsg and recvmmsg syscalls in case of short read.
* Fixed decoding of mincore syscall's last argument.
* Fixed remaining errors in mapping between syscall numbers and numbers
of syscall arguments.
* Applied various fixes to strace-graph script.
Noteworthy changes in release 4.11 (2015-12-21)
===============================================
* Changes in behavior
* Some syscalls have different names depending on architecture and
personality. In these cases, syscall filtering and printing now
consistently uses the names that match corresponding __NR_* kernel
macros of the tracee's architecture and personality.
* Added strace prefix to all diagnostic messages.
* Improvements
* Enhanced and extended test suite.
* Implemented reliable tracing of processes whose personality differs
from the personality of strace, fixed decoding of 32-bit personality
syscalls on 64-bit architectures.
* When some data referenced by syscall arguments is irrelevant or cannot
be read from tracee's memory, strace now prints its address consistently.
* When a syscall is restarted using restart_syscall mechanism, strace now
shows the syscall name on architectures that expose this information.
* Print values returned by epoll_create1, eventfd, eventfd2, fanotify_init,
inotify_init1, perf_event_open, pipe, pipe2, signalfd, signalfd4, socket,
socketpair, timerfd, and timerfd_create syscalls, as well as F_DUPFD and
F_DUPFD_CLOEXEC fcntl commands, as file descriptors.
* Optimized decoding of indirect socket syscalls.
* Implemented decoding of nanoseconds along with seconds in stat family
syscalls (addresses Fedora bug #1251176).
* Implemented decoding of struct statfs.f_flags in statfs syscall.
* Implemented decoding of siginfo_t.si_syscall and siginfo_t.si_arch
in SIGSYS signal.
* Implemented decoding of indirect syscall on mips o32.
* Implemented decoding of IPPROTO_IP control messages.
* Implemented decoding of setsockopt syscall multicast arguments.
* Enhanced decoding of struct sigevent.
* Enhanced decoding of block, loop, mtd, ptp, rtc, SG_IO, socket, tty,
and v4l2 ioctl syscall arguments.
* Enhanced decoding of epoll_create, fcntl, fcntl64, futex, getdents,
getdents64, getsockopt, io_*, mount, msgctl, prctl, quotactl, recvfrom,
sendfile, setsockopt, and shmctl syscalls.
* Implemented decoding of bpf, execveat, ioperm, iopl, kcmp, kexec_file_load,
lookup_dcookie, membarrier, memfd_create, mlock2, name_to_handle_at,
open_by_handle_at, sched_getattr, sched_setattr, and userfaultfd syscalls.
* Updated lists of AF_*, EPOLL_*, FALLOC_FL_*, F_*, INPUT_PROP_*, IPPROTO_*,
IPV6_*, IP_*, KEY_*, LOCK_*, MNT_*, MS_*, PACKET_*, PERF_FLAG_*, PF_*,
PR_*, PTRACE_O_*, RENAME_*, SCTP_*, SECBIT_*, SO_*, TCP_*, and siginfo_t
constants.
* Added Nios II architecture support.
* Added new syscall entries to match Linux 4.4.
* Bug fixes
* Fixed potential short read of strings from tracee's memory.
* Fixed -qq option in conjunction with -o option.
* Fixed filtering of <unavailable> syscalls.
* Fixed decoding of ioctl syscall command on aarch64 and 32-bit architectures
with 64-bit aligned structures.
* Fixed decoding of eventfd2, epoll_create1, signalfd4, and sync_file_range2
syscall flags arguments.
* Fixed decoding of 4th argument of clock_nanosleep syscall.
* Fixed decoding of getpagesize syscall on m68k.
* Fixed decoding of getrandom and seccomp syscalls on aarch64.
* Fixed decoding of timezone argument of gettimeofday and settimeofday
* syscalls.
* Fixed decoding of offset argument of mmap2 syscall on arm, sparc,
and sparc64.
* Fixed decoding of pipe syscall on alpha and mips.
* Fixed decoding of pipe2 syscall on ia64, sh, sparc, and sparc64.
* Fixed decoding of signal mask argument of pselect6 syscall on x32.
* Fixed decoding of signal mask of rt_sigreturn syscall on aarch64, m68k,
and x32.
* Fixed decoding of 4th argument of semctl indirect syscall.
* Fixed decoding of sa_restorer and sa_mask of sigaction syscall on m68k.
* Fixed decoding of statfs64 and fstatfs64 syscalls on arm eabi.
* Fixed decoding of struct dirent on x32.
* Fixed decoding of times syscall return value on mips n32 and x32.
* Fixed decoding of path argument of umount2 syscall
(addresses Debian bug #785050).
* Worked around a kernel bug in tracing privileged executables.
* Fixed various errors in mapping between syscall numbers and associated
information like the number of syscall arguments, the name of syscall,
and syscall decoder.
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).