[strace/strace] Release v5.6 - strace 5.6

[Dmitry V. Levin]

Noteworthy changes in strace 5.6 (2020-04-07)
=============================================

* Changes in behaviour
  * Messages about unknown tracees are now subject to the strace's quietness
    setting (-q/--quiet).
  * If -A option is provided without -o, or -S option without -c/-C, a warning
    about its uselessness is printed now.
  * The usage of --seccomp-bpf without -f has no effect now.

* 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), including those that couldn't be silenced
      previously (path resolution messages and "superseded by execve").
    * 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).
  * Implemented ability to select the set of displayed columns in the call
    summary output (-U/--summary-columns option).
  * Implemented ability to sort on any summary column.
  * Implemented ability to show information about minimum and maximum call
    duration in the call summary output (addresses Debian bug #240945).
  * Implemented printing of PIDs associated with pidfds in -yy mode.
  * Implemented PTRACE_GETREGS API support on hppa, sh, sh64, and xtensa.
  * Improved performance of libdw-based stack traces printing by implementing
    a symbol-to-address cache.
  * Implemented decoding of openat2 and pidfd_getfd syscalls.
  * Enhanced io_uring_register, prctl, sched_getattr, and sched_setattr syscall
    decoding.
  * Implemented decoding of BPF_MAP_LOOKUP_BATCH,
    BPF_MAP_LOOKUP_AND_DELETE_BATCH, BPF_MAP_UPDATE_BATCH, and
    BPF_MAP_DELETE_BATCH bpf syscall commands.
  * Enhanced decoding of BPF_MAP_CREATE and BPF_PROG_ATTACH bpf syscall
    commands.
  * Enhanced decoding of RTC_VL_READ ioctl command.
  * Enhanced decoding of IFLA_\* netlink attributes.
  * Implemented HIDIOCGRAWUNIQ() ioctl command number printing.
  * Wired up kexec_file_load syscall on hppa.
  * Updated lists of AUDIT_\*, BPF_\*, CLONE_\*, GRND_\*, IFLA_\*, IORING_\*,
    IPPROTO_\*, KEY_\*, KVM_\*, RTM_F_\*, SCHED_\*, and *_MAGIC constants.
  * Updated lists of ioctl commands from Linux 5.6.

* Bug fixes
  * Fixed build on csky abiv1 architecture.
  * Various minor fixes in VIDIOC_\* ioctl output formatting.
  * Fix printing of the size field for _IOC_NONE ioctl command numbers on sparc.

* Portability
  * On hppa, linux kernel >= 4.7 is required.
    On sh and sh64, linux kernel >= 2.6.28 is required.
    Older versions without a decent PTRACE_GETREGS support will not work.

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:

* Alistair Francis
* Dmitry V. Levin
* Eugene Syromyatnikov
* Gleb Fotengauer-Malinovskiy
* Jann Horn
* Ma Jun
* Masatake YAMATO
* Paul Chaignon
* Philippe De Muyter

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

Downloads
=========

**Please ignore so called "Source code" links provided by github, they are useless**.

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