Noteworthy changes in strace 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.

Contributors
============

This release was made possible by the contributions of many people.
The maintainers are grateful to everyone who has contributed
changes or bug reports.  These include:

* Andreas Schwab
* Baruch Siach
* DJ Delorie
* Denys Vlasenko
* Dmitry V. Levin
* Eugene Syromyatnikov
* Gleb Fotengauer-Malinovskiy
* Jeff Law
* Martin Lau
* Shankara Pailoor
* Tuan Hoang

Please refer to the CREDITS file for the full list of strace contributors.

Noteworthy changes in strace 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.

Contributors
============

This release was made possible by the contributions of many people.
The maintainers are grateful to everyone who has contributed
changes or bug reports.  These include:

* Dmitry V. Levin
* Dmitry Vyukov
* Eugene Syromyatnikov
* Gleb Fotengauer-Malinovskiy
* Jamal Hadi Salim
* Janosch Frank
* Masatake YAMATO
* Rasmus Villemoes
* Shankara Pailoor

Please refer to the CREDITS file for the full list of strace contributors.

Noteworthy changes in strace 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.

Contributors
============

This release was made possible by the contributions of many people.
The maintainers are grateful to everyone who has contributed
changes or bug reports.  These include:

* Dmitry V. Levin
* Elvira Khabirova
* Eugene Syromyatnikov
* Gleb Fotengauer-Malinovskiy
* Pierre Marsais
* Zhibin Li

Please refer to the CREDITS file for the full list of strace contributors.

Noteworthy changes in strace 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.

Contributors
============

This release was made possible by the contributions of many people.
The maintainers are grateful to everyone who has contributed
changes or bug reports.  These include:

* Chen Jingpiao
* Dmitry V. Levin
* Elliott Hughes
* Eugene Syromyatnikov
* Gleb Fotengauer-Malinovskiy
* Masatake YAMATO
* Pierre Marsais
* Zhibin Li

NEWS for strace version 4.23

============================

* Changes in behaviour
  * On x32 personality, 64-bit syscalls (such as readv) are now shown with "strace#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.

Contributors
============

This release was made possible by the contributions of many people.
The maintainers are grateful to everyone who has contributed
changes or bug reports.  These include:

* Andre McCurdy
* Chris Lamb
* Dmitry V. Levin
* Eugene Syromyatnikov
* Gleb Fotengauer-Malinovskiy
* Harsha Sharma
* Mark Wielaard
* Masatake YAMATO
* Zhibin Li

NEWS for strace version 4.22

============================

* 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.

Contributors
============

This release was made possible by the contributions of many people.
The maintainers are grateful to everyone who has contributed
changes or bug reports.  These include:

Chen Jingpiao
Dmitry V. Levin
Elvira Khabirova
Eugene Syromyatnikov
Gleb Fotengauer-Malinovskiy
Harsha Sharma
J. Bruce Fields
Josh Triplett
Masatake YAMATO
Philipp Marek

NEWS for strace version 4.21

============================

* 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.

Contributors
============

This release was made possible by the contributions of many people.
The maintainers are grateful to everyone who has contributed
changes or bug reports.  These include:

Chen Jingpiao
DJ Delorie
Dmitry V. Levin
Elvira Khabirova
Eugene Syromyatnikov
Gleb Fotengauer-Malinovskiy
Harsha Sharma
Lubomir Rintel
Masatake YAMATO
Nikolay Marchuk
Rolf Eike Beer
Victor Krapivensky
Vitaly Chaykovsky

NEWS for strace version 4.20

============================

* 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.

Contributors
============

This release was made possible by the contributions of many people.
The maintainers are grateful to everyone who has contributed
changes or bug reports.  These include:

Baruch Siach
Dmitry V. Levin
Eugene Syromyatnikov
Gleb Fotengauer-Malinovskiy
JingPiao Chen
Steve McIntyre

NEWS for strace version 4.19

============================

* 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.

Contributors
============

This release was made possible by the contributions of many people.
The maintainers are grateful to everyone who has contributed
changes or bug reports.  These include:

Anatoly Pugachev
Dmitry V. Levin
Edgar Kaziakhmedov
Eugene Syromyatnikov
Fabien Siron
Gleb Fotengauer-Malinovskiy
JingPiao Chen
Lazar Trsic
Nikolay Marchuk
Victor Krapivensky

NEWS for strace version 4.18

============================

* 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.

Contributors
============

This release was made possible by the contributions of many people.
The maintainers are grateful to everyone who has contributed
changes or bug reports.  These include:

Andreas Schwab
David Robins
Dmitry V. Levin
Eugene Syromyatnikov
Eugeniy Paltsev
Fabien Siron
Gleb Fotengauer-Malinovskiy
JingPiao Chen
Khem Raj
Masatake YAMATO
Miroslav Lichvar
Romain Naour
Victor Krapivensky