Implement -e trace=/regex option

* qualify.c: Include <regex.h>.
(qualify_syscall_regex): New function.
(qualify_syscall): Use it.
* strace.1: Document -e trace=/regex option.
* NEWS: Mention -e trace=/regex option.
* tests/regex.test: New test.
* tests/Makefile.am (DECODER_TESTS): Add it.
* tests/options-syntax.test: Add checks for invaild regexp
and for regexp that doesn't match a syscall.

tests: fix ioctl_nsfs.test on hppa

* tests/ioctl_nsfs.c (test_user_namespace): Specify an address
in the middle of a mapped page as child_stack address argument
of the clone call.
[IA64] (clone): Update.

tests: fix ioctl_nsfs.test on ia64

glibc on ia64 provides no clone() function, but there is a __clone2
function instead.  It is documented but no prototype is provided by
glibc.

* tests/ioctl_nsfs.c [IA64] (__clone2): New prototype.
[IA64] (clone): New macro wrapper around __clone2.

tests: check decoding of the remaining V4L2_BUF_TYPE_* types

* tests/ioctl_v4l2.c (init_v4l2_format, print_ioctl_v4l2): New functions
to avoid code duplication in VIDIOC_S_FMT and VIDIOC_TRY_FMT tests.
(main) <VIDIOC_G_FMT, VIDIOC_S_FMT, VIDIOC_TRY_FMT>: Use them.  Add
checks for remaining V4L2_BUF_TYPE_* types.

Signed-off-by: Edgar Kaziahmedov <edos@linux.com>

v4l2: Implement decoding of the remaining V4L2_BUF_TYPE_* types

* v4l2.c: Include "xlat/v4l2_vbi_flags.h" and "xlat/v4l2_sliced_flags.h".
(struct_v4l2_clip): New typedef.  Mpersify it.
(print_v4l2_clip): New function.
(print_v4l2_format_fmt): Use it.  Add struct tcb argument.  Implement
decoding of the remaining V4L2_BUF_TYPE_* types.
* xlat/v4l2_vbi_flags.in: Add V4L2_VBI_UNSYNC and V4L2_VBI_INTERLACED
introduced by linux kernel commit v2.5.46~39^2~23^2~4.
Add V4L2_VBI_ITU_525_F1_START, V4L2_VBI_ITU_525_F2_START,
V4L2_VBI_ITU_625_F1_START, and V4L2_VBI_ITU_625_F2_START introduced by
linux kernel commit v3.17-rc1~112^2~217.
* xlat/v4l2_sliced_flags.in: Add V4L2_SLICED_TELETEXT_B, V4L2_SLICED_VPS,
V4L2_SLICED_CAPTION_525, V4L2_SLICED_WSS_625, V4L2_SLICED_VBI_525, and
V4L2_SLICED_VBI_625 introduced by linux kernel commit v2.6.14-rc2~64.
* configure.ac (AC_CHECK_DECLS): Add V4L2_BUF_TYPE_SDR_CAPTURE and
V4L2_BUF_TYPE_SDR_OUTPUT.
(AC_CHECK_MEMBERS): Add struct v4l2_window.global_alpha and
struct v4l2_sdr_format.buffersize.
* NEWS: Mention this change.

Signed-off-by: Edgar Kaziahmedov <edos@linux.com>

travis: use mainline kernel uapi headers for coverage

* .travis.yml (matrix) <CHECK=coverage>: Add KHEADERS=torvalds/linux.
* travis-build.sh: Handle $KHEADERS.
* travis-install.sh: Likewise.

travis: switch from clang-3.6 to clang-3.8

* .travis.yml (matrix): Change clang-3.6 to clang-3.8.

Implement decoding of NS_* ioctl commands

* configure.ac (AC_CHECK_HEADERS): Add linux/nsfs.h.
* defs.h (DECL_IOCTL(nsfs)): New prototype.
(setns_types): Make global.
* ioctl.c (ioctl_decode): Call nsfs_ioctl for 0xb7 code.
* nsfs.c: New file.
* nsfs.h: Likewise.
* Makefile.am (strace_SOURCES): Add them.
* tests/ioctl_nsfs.c: New file.
* tests/ioctl_nsfs.test: Likewise.
* tests/.gitignore: Add ioctl_nsfs.
* tests/Makefile.am (check_PROGRAMS): Likewise.
(DECODER_TESTS): Add ioctl_nsfs.test.
* NEWS: Mention this change.

travis: copy coverage test suite log to the travis log

* travis-build.sh (coverage): Print tests*/test-suite.log
and tests*/ksysent.log.

travis: add gcc-6

* .travis.yml (matrix): Add gcc-6 entries.
* travis-build.sh: Handle gcc*.
* travis-install.sh: Handle gcc-*.

tests: robustify gen_tests.sh against in-tree builds

* tests/gen_tests.sh: Use abs_srcdir instead of srcdir to construct
a path to gen_tests.sh in implicit make rules.

trace_syscall_exiting: do not call get_regs for filtered syscalls

This saves up to 25% of ptrace syscalls in case of trace filtering.

* syscall.c (trace_syscall_exiting): Do not call gettimeofday
and get_regs for filtered syscalls.
* NEWS: Mention this change.
* tests/get_regs.test: New test.
* tests/Makefile.am (MISC_TESTS): Add it.

Delay get_regs invocation

strace used to call get_regs on every stop of a tracee, including cases
when the result is going to be discarded.  Prepare to change this lavish
practice by delaying get_regs invocation until its result is actually
needed.

* defs.h (get_regs): Remove.
* strace.c (trace): Do not call get_regs.
* syscall.c (get_regs): Add static qualifier.
(trace_syscall_exiting, print_pc, get_scno): Call get_regs.

startup_tcb: move get_scno invocation to a more convenient place

* strace.c (trace): Move get_scno invocation ...
(startup_tcb): ... here.  This is a no-op change that slightly improves
readability.

get_regs: guard against subsequent invocations

At this moment there is only one call to get_regs,
but there is going to be more of them, so a guard is needed.

This change also adds a clear_regs call before get_regs,
which essentially reverts commit v4.9-288-ge9bfff6.

* strace.c (trace): Call clear_regs before get_regs.
* syscall.c (get_regs): Skip if get_regs_error != -1.

syscall: move definitions of automatic variables closer to their use

* syscall.c (trace_syscall_entering, trace_syscall_exiting): Move
definitions of automatic variables closer to their first use.  This
change slightly improves readability.

tests: check decoding of gettid syscall

* tests/gettid.c: New file.
* tests/.gitignore: Add gettid.
* tests/Makefile.am (check_PROGRAMS): Likewise.
* tests/gen_tests.in (gettid): New entry.

tests: fix build on alpha

* tests/getpid.c: Skip if __NR_getpid is not defined.
* tests/getppid.c: Skip if __NR_getppid is not defined.

Fixes: fd1041f6 ("tests: add tests for getpid and getppid syscalls")

Fix build with old linux/netlink.h

* socketutils.c: Provide a fallback definition of NETLINK_SOCK_DIAG.

Fixes: 5c256356 ("Do not include xlat/netlink_protocols.h twice")

Do not include xlat/netlink_protocols.h twice

Make netlink_protocols a global xlat array defined in net.c file.

* defs.h (netlink_protocols): New prototype.
* socketutils.c: Stop including "xlat/netlink_protocols.h".

Do not include xlat/clocknames.h twice

Make clocknames a global xlat array defined in time.c file.

* defs.h (clocknames): New prototype.
* perf.c: Stop including "xlat/clocknames.h".

Remove unused xlat/openmodessol.in

* xlat/openmodessol.in: Remove file unused since commit
v4.10-45-gdf4dd8b.

Remove unused xlat/aclipc.in

* xlat/aclipc.in: Remove file unused since commit v4.9-46-g681452b.

tests: remove statfs.expected

statfs.expected is unused since commit v4.11-515-g67c2f67.

* tests/statfs.expected: Remove.
* tests/Makefile.am (EXTRA_DIST): Remove it.

tests: add tests for getpid and getppid syscalls

Signed-off-by: Sandhya Bankar <bankarsandhya512@gmail.com>
[ldv: rewritten everything]

* tests/getpid.c: New file.
* tests/getppid.c: Likewise.
* tests/.gitignore: Add getpid and getppid.
* tests/pure_executables.list: Likewise.
* tests/Makefile.am (check_PROGRAMS): Likewise.
* tests/gen_tests.in (getpid, getppid): New entries.

Update V4L2_* constants

* xlat/v4l2_buf_flags.in: Add V4L2_BUF_FLAG_PREPARED,
V4L2_BUF_FLAG_NO_CACHE_INVALIDATE, and V4L2_BUF_FLAG_NO_CACHE_CLEAN
introduced by linux kernel commit v3.2-rc1~63^2~55.
Add V4L2_BUF_FLAG_TIMESTAMP_MASK, V4L2_BUF_FLAG_TIMESTAMP_UNKNOWN,
and V4L2_BUF_FLAG_TIMESTAMP_MONOTONIC introduced by linux kernel commit
v3.9-rc1~93^2~536.
Add V4L2_BUF_FLAG_TIMESTAMP_COPY introduced by linux kernel commit
v3.10-rc1~136^2~560.
Add V4L2_BUF_FLAG_TSTAMP_SRC_MASK, V4L2_BUF_FLAG_TSTAMP_SRC_EOF,
and V4L2_BUF_FLAG_TSTAMP_SRC_SOE introduced by linux kernel commit
v3.15-rc1~85^2~186.
Add V4L2_BUF_FLAG_LAST introduced by linux kernel commit
v4.2-rc1~107^2~389.
* xlat/v4l2_buf_types.in: Add V4L2_BUF_TYPE_SDR_CAPTURE
and V4L2_BUF_TYPE_SDR_OUTPUT introduced by linux kernel commits
v3.15-rc1~85^2~213 and v4.4-rc1~118^2~14, respectively.
* xlat/xlat/v4l2_colorspaces.in: Add V4L2_COLORSPACE_ADOBERGB
and V4L2_COLORSPACE_BT2020 introduced by linux kernel commit
v3.19-rc1~29^2~72.
Add V4L2_COLORSPACE_RAW and V4L2_COLORSPACE_DCI_P3 introduced by linux
kernel commits v4.2-rc1~107^2~182 and v4.4-rc1~118^2~120, respectively.
* xlat/v4l2_device_capabilities_flags.in: Add V4L2_CAP_SDR_CAPTURE,
V4L2_CAP_EXT_PIX_FORMAT, and V4L2_CAP_SDR_OUTPUT introduced by linux
kernel commits v3.15-rc1~85^2~210, v3.17-rc1~112^2~327,
and v4.4-rc1~118^2~14, respectively.
* xlat/v4l2_memories.in: Add V4L2_MEMORY_OVERLAY introduced
in linux 2.5.46.  Add V4L2_MEMORY_DMABUF introduced by linux kernel
commit v3.8-rc1~115^2^2~52.

Signed-off-by: Edgar Kaziahmedov <edos@linux.com>

Implement -e trace=%statfs option

linux/*/syscallent*.h part is modified automatically by:

sed -i 's/TF\(,[[:space:]]*SEN.*[_"]statv\?fs\)/TF|TSF\1/' \
linux/*/syscallent*.h

[ldv: rewritten trace_statfs.test using sched.test as a template]

* sysent.h (TRACE_STATFS): New macro.
* syscall.c: Alias TSF to TRACE_STATFS around syscallent.h inclusion.
* qualify.c (lookup_class): Add SCHED_STATFS for "%statfs".
* strace.1 (.SS Filtering): Add information about %statfs syscall class.
* NEWS: Mention this change.
* linux/64/syscallent.h (statfs): Add TSF flag.
* linux/aarch64/syscallent.h: Likewise.
* linux/x32/syscallent.h: Likewise.
* linux/x86_64/syscallent.h: Likewise.
* linux/mips/syscallent-n64.h: Likewise.
* linux/32/syscallent.h (statfs64): Likewise.
* linux/arm/syscallent.h (statfs, statfs64): Likewise.
* linux/avr32/syscallent.h: Likewise.
* linux/bfin/syscallent.h: Likewise.
* linux/crisv10/syscallent.h: Likewise.
* linux/hppa/syscallent.h: Likewise.
* linux/i386/syscallent.h: Likewise.
* linux/ia64/syscallent.h: Likewise.
* linux/m68k/syscallent.h: Likewise.
* linux/microblaze/syscallent.h: Likewise.
* linux/mips/syscallent-n32.h: Likewise.
* linux/mips/syscallent-o32.h: Likewise.
* linux/powerpc/syscallent.h: Likewise.
* linux/powerpc64/syscallent.h: Likewise.
* linux/s390/syscallent.h: Likewise.
* linux/s390x/syscallent.h: Likewise.
* linux/sh/syscallent.h: Likewise.
* linux/sh64/syscallent.h: Likewise.
* linux/sparc/syscallent.h: Likewise.
* linux/sparc64/syscallent.h: Likewise.
* linux/xtensa/syscallent.h: Likewise.
* linux/alpha/syscallent.h (osf_statfs, osf_statfs64, statfs): Likewise.
* linux/mips/syscallent-compat.h (*_statfs, *_statvfs): Likewise.
* tests/trace_statfs.test: New test.
* tests/Makefile.am (DECODER_TESTS): Add it.
* tests/ksysent.c (TSF): New macro, defined to 0.
* tests/nsyscalls.c: Likewise.

Implement -e trace=%clock option

linux/*/syscallent.h part is modified automatically by
sed -i 's/0\(,[[:space:]]*SEN(clock_\)/TCL\1/' linux/*/syscallent*.h

[ldv: rewritten clock.test using sched.test as a template]

* sysent.h (TRACE_CLOCK): New macro.
* syscall.c: Alias TCL to TRACE_CLOCK around syscallent.h inclusion.
* qualify.c (lookup_class): Add TRACE_CLOCK for "%clock".
* strace.1 (.SS Filtering): Add information about %clock syscall class.
* NEWS: Mention this change.
* linux/32/syscallent.h: Add TCL flag for clock_* syscalls.
* linux/64/syscallent.h: Likewise.
* linux/alpha/syscallent.h: Likewise.
* linux/arm/syscallent.h: Likewise.
* linux/avr32/syscallent.h: Likewise.
* linux/bfin/syscallent.h: Likewise.
* linux/crisv10/syscallent.h: Likewise.
* linux/hppa/syscallent.h: Likewise.
* linux/i386/syscallent.h: Likewise.
* linux/ia64/syscallent.h: Likewise.
* linux/m68k/syscallent.h: Likewise.
* linux/microblaze/syscallent.h: Likewise.
* linux/mips/syscallent-n32.h: Likewise.
* linux/mips/syscallent-n64.h: Likewise.
* linux/mips/syscallent-o32.h: Likewise.
* linux/powerpc/syscallent.h: Likewise.
* linux/powerpc64/syscallent.h: Likewise.
* linux/s390/syscallent.h: Likewise.
* linux/s390x/syscallent.h: Likewise.
* linux/sh/syscallent.h: Likewise.
* linux/sh64/syscallent.h: Likewise.
* linux/sparc/syscallent.h: Likewise.
* linux/sparc64/syscallent.h: Likewise.
* linux/x32/syscallent.h: Likewise.
* linux/x86_64/syscallent.h: Likewise.
* linux/xtensa/syscallent.h: Likewise.
* tests/clock.test: New test.
* tests/Makefile.am (DECODER_TESTS): Add it.
* tests/ksysent.c (TCL): New macro, defined to 0.
* tests/nsyscalls.c: Likewise.

tests: tabulate xattr.test

* tests/gen_tests.in (xattr): New entry.
* tests/xattr.test: Remove.
* tests/Makefile.am (DECODER_TESTS): Remove xattr.test.

tests: generalize scripts that check non-abbreviated decoding of ioctls

* tests/ioctl-v.sh: New file.
* tests/Makefile.am (EXTRA_DIST): Add it.
(DECODER_TESTS): Remove ioctl_evdev-v.test, ioctl_loop-v.test,
and ioctl_rtc-v.test.
* tests/gen_tests.in (ioctl_evdev-v, ioctl_loop-v, ioctl_rtc-v):
New entries.
* tests/ioctl_evdev-v.test: Remove.
* tests/ioctl_loop-v.test: Ditto.
* tests/ioctl_rtc-v.test: Ditto.

tests: tabulate stereotypical test scripts

Convert test scripts that follow simple testing patterns to a table.
Generate all these scripts from gen_tests.in file using gen_tests.sh
script at bootstrap time.

The largest set of test scripts has been converted using
the following command:

grep -l ^run_strace_match_diff *.test |while read f; do
n="${f%.test}"
grep '^[^#]' "$f" |
grep -Evq '^(\. "\${srcdir=\.}/init\.sh"|run_strace_match_diff)' ||
sed -n 's/^run_strace_match_diff\(.*\)/'$n'\1/p' "$f"
done

The second largest set of test scripts has been converted using
the following command:

grep -l srcdir= *.test |while read f; do
n="${f%.test}"
grep '^[^#]' "$f" |
grep -Fvq srcdir= ||
sed -n 's/^. "\${srcdir=.}\/\([^"]\+\)".*/'$n'\t+\1/p' "$f"
done

* tests/gen_tests.in: New file.
* tests/gen_tests.sh: New file.
* bootstrap: Invoke it.
* tests/.gitignore: Add *.gen.test and gen_tests.am.
* tests/_newselect.test: Remove.
* tests/accept.test: Ditto.
* tests/accept4.test: Ditto.
* tests/access.test: Ditto.
* tests/acct.test: Ditto.
* tests/add_key.test: Ditto.
* tests/adjtimex.test: Ditto.
* tests/aio.test: Ditto.
* tests/alarm.test: Ditto.
* tests/bpf.test: Ditto.
* tests/btrfs.test: Ditto.
* tests/chmod.test: Ditto.
* tests/chown.test: Ditto.
* tests/chown32.test: Ditto.
* tests/chroot.test: Ditto.
* tests/clock_adjtime.test: Ditto.
* tests/clock_nanosleep.test: Ditto.
* tests/clock_xettime.test: Ditto.
* tests/copy_file_range.test: Ditto.
* tests/creat.test: Ditto.
* tests/delete_module.test: Ditto.
* tests/dup.test: Ditto.
* tests/dup2.test: Ditto.
* tests/dup3.test: Ditto.
* tests/epoll_create.test: Ditto.
* tests/epoll_create1.test: Ditto.
* tests/epoll_ctl.test: Ditto.
* tests/epoll_pwait.test: Ditto.
* tests/epoll_wait.test: Ditto.
* tests/erestartsys.test: Ditto.
* tests/execveat-v.test: Ditto.
* tests/execveat.test: Ditto.
* tests/faccessat.test: Ditto.
* tests/fadvise64_64.test: Ditto.
* tests/fallocate.test: Ditto.
* tests/fanotify_init.test: Ditto.
* tests/fanotify_mark.test: Ditto.
* tests/fchdir.test: Ditto.
* tests/fchmod.test: Ditto.
* tests/fchmodat.test: Ditto.
* tests/fchown.test: Ditto.
* tests/fchown32.test: Ditto.
* tests/fchownat.test: Ditto.
* tests/fcntl.test: Ditto.
* tests/fcntl64.test: Ditto.
* tests/fdatasync.test: Ditto.
* tests/file_handle.test: Ditto.
* tests/file_ioctl.test: Ditto.
* tests/finit_module.test: Ditto.
* tests/flock.test: Ditto.
* tests/fork-f.test: Ditto.
* tests/fstat64.test: Ditto.
* tests/fstatat64.test: Ditto.
* tests/fstatfs.test: Ditto.
* tests/fstatfs64.test: Ditto.
* tests/fsync.test: Ditto.
* tests/ftruncate.test: Ditto.
* tests/ftruncate64.test: Ditto.
* tests/futimesat.test: Ditto.
* tests/get_mempolicy.test: Ditto.
* tests/getcpu.test: Ditto.
* tests/getcwd.test: Ditto.
* tests/getdents.test: Ditto.
* tests/getdents64.test: Ditto.
* tests/getegid.test: Ditto.
* tests/getegid32.test: Ditto.
* tests/geteuid.test: Ditto.
* tests/geteuid32.test: Ditto.
* tests/getgid.test: Ditto.
* tests/getgid32.test: Ditto.
* tests/getgroups.test: Ditto.
* tests/getgroups32.test: Ditto.
* tests/getpeername.test: Ditto.
* tests/getpgrp.test: Ditto.
* tests/getrandom.test: Ditto.
* tests/getresgid.test: Ditto.
* tests/getresgid32.test: Ditto.
* tests/getresuid.test: Ditto.
* tests/getresuid32.test: Ditto.
* tests/getrlimit.test: Ditto.
* tests/getrusage.test: Ditto.
* tests/getsid.test: Ditto.
* tests/getsockname.test: Ditto.
* tests/getuid32.test: Ditto.
* tests/getxxid.test: Ditto.
* tests/inet-cmsg.test: Ditto.
* tests/init_module.test: Ditto.
* tests/inotify.test: Ditto.
* tests/inotify_init1.test: Ditto.
* tests/int_0x80.test: Ditto.
* tests/ioctl_block.test: Ditto.
* tests/ioctl_evdev.test: Ditto.
* tests/ioctl_loop.test: Ditto.
* tests/ioctl_mtd.test: Ditto.
* tests/ioctl_rtc.test: Ditto.
* tests/ioctl_scsi.test: Ditto.
* tests/ioctl_sg_io_v3.test: Ditto.
* tests/ioctl_sg_io_v4.test: Ditto.
* tests/ioctl_uffdio.test: Ditto.
* tests/ioctl_v4l2.test: Ditto.
* tests/ioperm.test: Ditto.
* tests/iopl.test: Ditto.
* tests/ioprio.test: Ditto.
* tests/ip_mreq.test: Ditto.
* tests/ipc.test: Ditto.
* tests/ipc_msg.test: Ditto.
* tests/ipc_sem.test: Ditto.
* tests/ipc_shm.test: Ditto.
* tests/kcmp.test: Ditto.
* tests/kexec_file_load.test: Ditto.
* tests/kexec_load.test: Ditto.
* tests/keyctl.test: Ditto.
* tests/kill.test: Ditto.
* tests/lchown.test: Ditto.
* tests/lchown32.test: Ditto.
* tests/link.test: Ditto.
* tests/linkat.test: Ditto.
* tests/lookup_dcookie.test: Ditto.
* tests/lstat.test: Ditto.
* tests/lstat64.test: Ditto.
* tests/mbind.test: Ditto.
* tests/membarrier.test: Ditto.
* tests/memfd_create.test: Ditto.
* tests/migrate_pages.test: Ditto.
* tests/mincore.test: Ditto.
* tests/mkdir.test: Ditto.
* tests/mkdirat.test: Ditto.
* tests/mknod.test: Ditto.
* tests/mknodat.test: Ditto.
* tests/mlock.test: Ditto.
* tests/mlock2.test: Ditto.
* tests/mlockall.test: Ditto.
* tests/mmap64.test: Ditto.
* tests/mmsg-silent.test: Ditto.
* tests/mmsg.test: Ditto.
* tests/mmsg_name-v.test: Ditto.
* tests/mmsg_name.test: Ditto.
* tests/mount.test: Ditto.
* tests/move_pages.test: Ditto.
* tests/mq.test: Ditto.
* tests/mq_sendrecv-read.test: Ditto.
* tests/mq_sendrecv-write.test: Ditto.
* tests/mq_sendrecv.test: Ditto.
* tests/msg_control-v.test: Ditto.
* tests/msg_control.test: Ditto.
* tests/msg_name.test: Ditto.
* tests/munlockall.test: Ditto.
* tests/nanosleep.test: Ditto.
* tests/net-icmp_filter.test: Ditto.
* tests/net-sockaddr.test: Ditto.
* tests/newfstatat.test: Ditto.
* tests/old_mmap.test: Ditto.
* tests/oldfstat.test: Ditto.
* tests/oldlstat.test: Ditto.
* tests/oldstat.test: Ditto.
* tests/open.test: Ditto.
* tests/openat.test: Ditto.
* tests/pause.test: Ditto.
* tests/perf_event_open.test: Ditto.
* tests/perf_event_open_nonverbose.test: Ditto.
* tests/perf_event_open_unabbrev.test: Ditto.
* tests/pipe2.test: Ditto.
* tests/pkey_alloc.test: Ditto.
* tests/pkey_free.test: Ditto.
* tests/pkey_mprotect.test: Ditto.
* tests/ppoll-v.test: Ditto.
* tests/ppoll.test: Ditto.
* tests/preadv-pwritev.test: Ditto.
* tests/preadv.test: Ditto.
* tests/preadv2-pwritev2.test: Ditto.
* tests/printstr.test: Ditto.
* tests/prlimit64.test: Ditto.
* tests/process_vm_readv.test: Ditto.
* tests/process_vm_writev.test: Ditto.
* tests/pselect6.test: Ditto.
* tests/ptrace.test: Ditto.
* tests/pwritev.test: Ditto.
* tests/quotactl-v.test: Ditto.
* tests/quotactl-xfs-v.test: Ditto.
* tests/quotactl-xfs.test: Ditto.
* tests/quotactl.test: Ditto.
* tests/readahead.test: Ditto.
* tests/readdir.test: Ditto.
* tests/readlink.test: Ditto.
* tests/readlinkat.test: Ditto.
* tests/reboot.test: Ditto.
* tests/recvfrom.test: Ditto.
* tests/recvmmsg-timeout.test: Ditto.
* tests/recvmsg.test: Ditto.
* tests/remap_file_pages.test: Ditto.
* tests/rename.test: Ditto.
* tests/renameat.test: Ditto.
* tests/renameat2.test: Ditto.
* tests/request_key.test: Ditto.
* tests/rmdir.test: Ditto.
* tests/rt_sigpending.test: Ditto.
* tests/rt_sigprocmask.test: Ditto.
* tests/rt_sigqueueinfo.test: Ditto.
* tests/rt_sigreturn.test: Ditto.
* tests/rt_sigsuspend.test: Ditto.
* tests/rt_sigtimedwait.test: Ditto.
* tests/rt_tgsigqueueinfo.test: Ditto.
* tests/sched_get_priority_mxx.test: Ditto.
* tests/sched_rr_get_interval.test: Ditto.
* tests/sched_xetaffinity.test: Ditto.
* tests/sched_xetattr.test: Ditto.
* tests/sched_xetparam.test: Ditto.
* tests/sched_xetscheduler.test: Ditto.
* tests/sched_yield.test: Ditto.
* tests/seccomp-filter-v.test: Ditto.
* tests/seccomp-filter.test: Ditto.
* tests/select.test: Ditto.
* tests/semop.test: Ditto.
* tests/sendfile.test: Ditto.
* tests/sendfile64.test: Ditto.
* tests/set_mempolicy.test: Ditto.
* tests/setdomainname.test: Ditto.
* tests/setfsgid.test: Ditto.
* tests/setfsgid32.test: Ditto.
* tests/setfsuid.test: Ditto.
* tests/setfsuid32.test: Ditto.
* tests/setgid.test: Ditto.
* tests/setgid32.test: Ditto.
* tests/setgroups.test: Ditto.
* tests/setgroups32.test: Ditto.
* tests/sethostname.test: Ditto.
* tests/setns.test: Ditto.
* tests/setregid.test: Ditto.
* tests/setregid32.test: Ditto.
* tests/setresgid.test: Ditto.
* tests/setresgid32.test: Ditto.
* tests/setresuid.test: Ditto.
* tests/setresuid32.test: Ditto.
* tests/setreuid.test: Ditto.
* tests/setreuid32.test: Ditto.
* tests/setrlimit.test: Ditto.
* tests/setuid.test: Ditto.
* tests/setuid32.test: Ditto.
* tests/shutdown.test: Ditto.
* tests/siginfo.test: Ditto.
* tests/signal_receive.test: Ditto.
* tests/signalfd4.test: Ditto.
* tests/sigreturn.test: Ditto.
* tests/socketcall.test: Ditto.
* tests/splice.test: Ditto.
* tests/stat.test: Ditto.
* tests/stat64.test: Ditto.
* tests/statfs64.test: Ditto.
* tests/statx.sh: Ditto.
* tests/statx.test: Ditto.
* tests/swap.test: Ditto.
* tests/symlink.test: Ditto.
* tests/symlinkat.test: Ditto.
* tests/sync.test: Ditto.
* tests/sync_file_range.test: Ditto.
* tests/sync_file_range2.test: Ditto.
* tests/sysinfo.test: Ditto.
* tests/syslog.test: Ditto.
* tests/tee.test: Ditto.
* tests/time.test: Ditto.
* tests/timer_create.test: Ditto.
* tests/timer_xettime.test: Ditto.
* tests/timerfd_xettime.test: Ditto.
* tests/times-fail.test: Ditto.
* tests/times.test: Ditto.
* tests/truncate.test: Ditto.
* tests/truncate64.test: Ditto.
* tests/ugetrlimit.test: Ditto.
* tests/umask.test: Ditto.
* tests/umoven-illptr.test: Ditto.
* tests/umovestr-illptr.test: Ditto.
* tests/umovestr3.test: Ditto.
* tests/unlink.test: Ditto.
* tests/unlinkat.test: Ditto.
* tests/unshare.test: Ditto.
* tests/userfaultfd.test: Ditto.
* tests/ustat.test: Ditto.
* tests/utime.test: Ditto.
* tests/utimes.test: Ditto.
* tests/vfork-f.test: Ditto.
* tests/vhangup.test: Ditto.
* tests/vmsplice.test: Ditto.
* tests/wait4-v.test: Ditto.
* tests/wait4.test: Ditto.
* tests/waitid-v.test: Ditto.
* tests/waitid.test: Ditto.
* tests/waitpid.test: Ditto.
* tests/xattr-strings.test: Ditto.
* tests/xet_robust_list.test: Ditto.
* tests/xetitimer.test: Ditto.
* tests/xetpgid.test: Ditto.
* tests/xetpriority.test: Ditto.
* tests/xettimeofday.test: Ditto.
* tests/Makefile.am (DECODER_TESTS, MISC_TESTS): Remove them.
Include gen_tests.am.
(TESTS): Add $(GEN_TESTS).
(XFAIL_TESTS_x86_64, XFAIL_TESTS_x32): Rename int_0x80.test
to int_0x80.gen.test.
(EXTRA_DIST): Add gen_tests.in and gen_tests.sh, remove statx.sh.
(clean-local-check): Remove $(GEN_TESTS:.gen.test=.dir).

tests: handle test scripts with .gen.test suffix

* tests/init.sh: If script name ends with .gen.test,
set NAME variable with .gen.test suffix stripped.

mpers.awk: add support for multidimensional arrays

* mpers.awk (update_upper_bound): New function, which maintains new "count"
property for storing total element count and updates "upper_bound"
property which now contains string with array dimensions.
(/^DW_AT_upper_bound/, /^DW_AT_count/): Use it.
(what_is) <case "array_type">: Use "count" property in order to calculate
returned_size, do not embody returned string in square brackets.
* mpers_test.sh: Add checks for multidimensional arrays.

mpers.awk: prepare for adding support of multidimensional arrays

* mpers.awk (what_is) <case "structure_type", case "union_type">:
Move formatting of array upper_bound ...
<case "array_type">: ... here.

tests: cleanup temporary files removals

As every test now runs in its own subdirectory, there is no need
to remove leftover files manually by each test.

* tests/init.sh (run_strace_match_diff): Do not remove $EXP.
* tests/brk.test: Likewise.
* tests/options-syntax.test: Likewise.
* tests/qual_inject-retval.test (check_injection): Likewise.
* tests/qual_signal.test (test_one_sig): Likewise.
* tests/sched.test: Likewise.
* tests/seccomp-strict.test: Likewise.
* tests/strace-V.test: Likewise.
* tests/strace-tt.test: Likewise.
* tests/strace-ttt.test: Likewise.
* tests/threads-execve.test: Likewise.
* tests/attach-f-p.test: Use $EXP instead of $OUT, do not remove it.
* tests/personality.test: Likewise.
* tests/poll.test: Likewise.
* tests/fstat.test: Likewise.
* tests/ipc.sh: Likewise.
* tests/restart_syscall.test: Likewise.
* tests/utimensat.test: Likewise.
* tests/attach-p-cmd.test: Likewise.  Do not remove
attach-p-cmd.test-lock.
* tests/detach-running.test: Do not remove $LOG.
* tests/detach-sleeping.test: Likewise.
* tests/detach-stopped.test: Likewise.
* tests/redirect.test: Do not remove $OUT.
* tests/strace-S.test: Likewise.
* tests/getdents.test: Do not remove $LOG.dir.
* tests/getdents64.test: Likewise.
* tests/readdir.test: Likewise.
* tests/btrfs-v.test: Do not remove $EXP and $OUT.
* tests/btrfs-vw.test: Likewise.
* tests/btrfs-w.test: Likewise.
* tests/execve-v.test: Likewise.
* tests/execve.test: Likewise.
* tests/fadvise64.test: Likewise.
* tests/getuid.test: Likewise.
* tests/ioctl.test: Likewise.
* tests/ioctl_dm-v.test: Likewise.
* tests/ioctl_dm.test: Likewise.
* tests/ioctl_evdev-v.test: Likewise.
* tests/ioctl_loop-nv.test: Likewise.
* tests/ioctl_loop-v.test: Likewise.
* tests/ioctl_loop.test: Likewise.
* tests/ioctl_rtc-v.test: Likewise.
* tests/ioctl_sock_gifconf.test: Likewise.
* tests/llseek.test: Likewise.
* tests/lseek.test: Likewise.
* tests/mmap.test: Likewise.
* tests/net-y-unix.test: Likewise.
* tests/net-yy-inet.test: Likewise.
* tests/net-yy-netlink.test: Likewise.
* tests/net-yy-unix.test: Likewise.
* tests/opipe.test: Likewise.
* tests/prctl-arg2-intptr.test: Likewise.
* tests/prctl-dumpable.test: Likewise.
* tests/prctl-name.test: Likewise.
* tests/prctl-no-args.test: Likewise.
* tests/prctl-pdeathsig.test: Likewise.
* tests/prctl-seccomp-filter-v.test: Likewise.
* tests/prctl-seccomp-strict.test: Likewise.
* tests/prctl-securebits.test: Likewise.
* tests/prctl-tid_address.test: Likewise.
* tests/prctl-tsc.test: Likewise.
* tests/umovestr2.test: Likewise.
* tests/uname.test: Likewise.
* tests/pread64-pwrite64.test: Do nore remove pread64-pwrite64-tmpfile.
* tests/read-write.test: Do nore remove read-write-tmpfile.
* tests/qual_fault.test (check_fault_injection): Do not remove $EXP,
$outexp, and $outgot.
* tests/redirect-fds.test (check_fd): Reorder removal of work files.
* tests/pc.test: Use $EXP instead of $EXPECTED, do not remove it.
* tests/strace-t.test: Likewise.
* tests/scm_rights-fd.test: Likewise.  Use dir instead of $LOG.dir,
do not remove it.
* tests/strace-ff.test: Do not remove $OUT and $LOG.* files.

tests: enhance sched.test negative check

* tests/sched.test: Test that trace=%sched doesn't match
anything besides sched_* syscalls by checking it against all test
executables without side effects listed in pure_executables.list
except sched_* and times.

tests: add a list of executables without side effects

These are executables that could be used by several different tests
simultaneously.

* tests/pure_executables.list: New file.
* tests/Makefile.am (EXTRA_DIST): Add it.

tests: use fixed socket address in net-yy-unix.test

This allows net-yy-unix invocation without arguments.

* tests/net-yy-unix.c (TEST_SOCKET): New macro.
(void): Use it instead of av[1].
* tests/net-yy-unix.test: Do not specify arguments for the test
executable.

tests: use fixed socket address in net-y-unix.test

This allows net-y-unix invocation without arguments.

* tests/net-y-unix.c (TEST_SOCKET): New macro.
(void): Use it instead of av[1].
* tests/net-y-unix.test: Do not specify arguments for the test
executable.

tests: run every test except ksysent.test in its own subdirectory

Many test executables create temporary files in the current work
directory for the duration of their execution.
This level of test isolation allows more test executables to be invoked
several times simultaneously.

* tests/.gitignore: Add *.dir, remove *.log.*, *.tmp, *.tmp-*,
and *.tmp.* patterns.
* tests/Makefile.am (clean-local, clean-local-check): New rules.
(.PHONY): Add clean-local-check.
(CLEANFILES): Remove all but ksysent.h.
* tests/init.sh: Strip test-specific prefix from LOG, OUT, and EXP
variables.  When invoked from a test, create a new test-specific
directory, chdir into it, and add more ../ prefix to STRACE variable.
(run_prog): Replace "./" with "../".
* tests/attach-f-p.test: Replace "./" with "../".
* tests/attach-p-cmd.test: Likewise.
* tests/bexecve.test: Likewise.
* tests/btrfs-v.test: Likewise.
* tests/btrfs-vw.test: Likewise.
* tests/btrfs-w.test: Likewise.
* tests/count.test: Likewise.
* tests/detach-running.test: Likewise.
* tests/detach-sleeping.test: Likewise.
* tests/detach-stopped.test: Likewise.
* tests/mmap.test: Likewise.
* tests/net-y-unix.test: Likewise.
* tests/net-yy-inet.test: Likewise.
* tests/net-yy-netlink.test: Likewise.
* tests/net-yy-unix.test: Likewise.
* tests/net.test: Likewise.
* tests/opipe.test: Likewise.
* tests/poll.test: Likewise.
* tests/prctl-seccomp-strict.test: Likewise.
* tests/qual_fault-exit_group.test: Likewise.
* tests/qual_fault.test: Likewise.
* tests/qual_inject-error-signal.test: Likewise.
* tests/qual_inject-retval.test: Likewise.
* tests/qual_inject-signal.test: Likewise.
* tests/qual_signal.test: Likewise.
* tests/qual_syscall.test: Likewise.
* tests/readv.test: Likewise.
* tests/redirect-fds.test: Likewise.
* tests/sched.test: Likewise.
* tests/scm_rights-fd.test: Likewise.
* tests/seccomp-strict.test: Likewise.
* tests/strace-C.test: Likewise.
* tests/strace-E.expected: Likewise.
* tests/strace-E.test: Likewise.
* tests/strace-S.test: Likewise.
* tests/strace-T.test: Likewise.
* tests/strace-V.test: Likewise.
* tests/strace-ff.test: Likewise.
* tests/strace-k.test: Likewise.
* tests/strace-r.expected: Likewise.
* tests/strace-r.test: Likewise.
* tests/strace-t.test: Likewise.
* tests/strace-tt.test: Likewise.
* tests/strace-ttt.test: Likewise.
* tests/sun_path.test: Likewise.
* tests/uname.test: Likewise.
* tests/unix-pair-send-recv.test: Likewise.
* tests/unix-pair-sendto-recvfrom.test: Likewise.

tests: make test executables invocable outside current work directory

Most of test executables were ready for the upcoming change,
this change prepares all the rest.

* tests/getdents.c (main): Use fixed name for the sample directory.
* tests/getdents64.c (main): Likewise.
* tests/readdir.c (main): Likewise.
* tests/mknod.c (sample): Change to a pointer.
(main): Use av[0] as a sample.
* tests/symlink.c (main): Use av[0] as a linkpath.
* tests/umode_t.c (sample): Change to a pointer.
(test_syscall): Fix expected output.
(main): Use av[0] as a sample.

tests: cleanup access.test

* tests/access.test: Use run_strace_match_diff.
* tests/access.c (main): Update expected output.

tests: cleanup oldfstat.test

* tests/oldfstat.test: Use fstat.test.

aarch64: workaround gcc+kernel bug

Due to a subtle gcc bug that leads to miscompiled aarch64 kernels,
the 3rd argument of sched_getattr syscall is not quite 32-bit
on aarch64 as on other architectures.  For more details see
https://sourceforge.net/p/strace/mailman/message/35721703/

* defs.h (print_abnormal_hi): New prototype.
* util.c (print_abnormal_hi): New function.
* sched.c (SYS_FUNC(sched_getattr)) [AARCH64]: Use it.
* tests/sched_xetattr.c (main) [__arm64__ || __aarch64__]: Test it.

alpha, mips: fix missing flags in stat related compatibility syscalls

Following commands do the fix:

Add TF flag, fixed by:
git grep -Fl '_stat' linux/*/syscallent* | xargs sed -i \
   's/0\(,[[:space:]]*SEN(.*_l\?stat[^i]\)/TF\1/'

Add TD flag, fixed by:
git grep -Fl '_stat' linux/*/syscallent* | xargs sed -i \
  's/0\(,[[:space:]]*SEN(.*_fstat\)/TD\1/'

* linux/alpha/syscallent.h: Add TF and TD flags to stat related
compat syscall entries.
* linux/mips/syscallent-compat.h: Likewise.

alpha: fix the number of arguments in alpha specific syscalls

* linux/alpha/syscallent.h (getxgid, osf_stat, osf_lstat, osf_fstat,
osf_sysinfo, sethae): Set nargs according to arch/alpha/kernel/osf_sys.c
from linux v4.10.

alpha: update comments about not implemented syscalls

* linux/alpha/syscallent.h: Sync "not implemented" comments
with arch/alpha/kernel/systbls.S from linux v4.10.

Update BPF_MAP_TYPE_* constants

* xlat/bpf_map_types.in: Add BPF_MAP_TYPE_ARRAY_OF_MAPS
and BPF_MAP_TYPE_HASH_OF_MAPS constants.

Update ioctl entries from linux v4.11-rc3

* linux/32/ioctls_inc_align16.h: Update from linux v4.11-rc3 using ioctls_gen.sh.
* linux/32/ioctls_inc_align32.h: Likewise.
* linux/32/ioctls_inc_align64.h: Likewise.
* linux/64/ioctls_inc.h: Likewise.
* linux/x32/ioctls_inc0.h: Likewise.
* linux/arm/ioctls_arch0.h: Likewise.
* linux/i386/ioctls_arch0.h: Likewise.
* linux/powerpc/ioctls_arch0.h: Likewise.
* linux/s390/ioctls_arch0.h: Likewise.
* linux/s390x/ioctls_arch0.h: Likewise.
* linux/x86_64/ioctls_arch0.h: Likewise.
* NEWS: Mention this.

maint: update for linux 4.11

* maint/ioctls_sym.sh (ppc_list): Add KVM_PPC_GET_RMMU_INFO
and KVM_PPC_CONFIGURE_V3_MMU.

test: rename README to README.md

* test/README: Rename to README.md, turn ../tests reference into an URL.

test: update README

* test/README: Tell the reader what this directory is actually for.

test: rewrite skodic.c demo

* test/skodic.c: Rewrite this demo to simplify its use.

Implement decoding of statx syscall

* linux/i386/syscallent.h [383]: Add statx entry.
* linux/x32/syscallent.h [332]: Likewise.
* linux/x86_64/syscallent.h [332]: Likewise.
* pathtrace.c (pathtrace_match): Handle SEN_statx.
* statx.c: New file.
* statx.h: Likewise.
* Makefile.am (strace_SOURCES): Add them.
* tests/.gitignore: Add statx.
* tests/Makefile.am (check_PROGRAMS): Likewise.
(DECODER_TESTS): Add statx.test.
* tests/statx.c: New file.
* tests/statx.test: Likewise.
* tests/xstatx.c: Modify to support statx.
* xlat/at_statx_sync_types.in: New file.
* xlat/statx_attrs.in: Likewise.
* xlat/statx_masks.in: Likewise.
* NEWS: Mention this change.

tests: check for out of bounds fetch in parsers of stat family syscalls

* tests/xstatx.c (main): Create STRUCT_STAT object using
TAIL_ALLOC_OBJECT_CONST_PTR.

tests: check unexpected syscall errors returned by stat family syscalls

* tests/xstatx.c (main) [!OLD_STAT]: Do not skip the test
in case of EOVERFLOW.
Treat errors other than ENOSYS and EOVERFLOW as fatal.

tests: move try_run_prog to init.sh

Looks like try_run_prog may be of general use by other syscall class
tests.

* tests/sched.test (try_run_prog): Move it...
* tests/init: ... here.

tests/sched.test: rc should be a local variable in try_run_prog

* tests/sched.test (try_run_prog): Add local rc.

tests: check decoding of int 0x80 on x86_64, x32, and x86

* tests/int_0x80.c: New file.
* tests/int_0x80.test: New test.
* tests/.gitignore: Add int_0x80.
* tests/Makefile.am (check_PROGRAMS): Likewise.
(MISC_TESTS, XFAIL_TESTS_x86_64, XFAIL_TESTS_x32): Add int_0x80.test.
(XFAIL_TESTS): Add $(XFAIL_TESTS_$(ARCH)).
(CLEANFILES): Add $(TESTS:=.tmp.out) and $(TESTS:=.tmp.exp).

strace-graph: handle pid looping

* strace-graph: On long running process or heavily forking one (like
compilation), it can happen that a parent get 2 different children with
the same pid.  By tracking the currently runnig pid and adding the start
timestamp to the pid, the graph can now handle that case.

Closes: https://github.com/strace/strace/pull/7

tests: use TAIL_ALLOC_OBJECT_CONST_PTR

Automatically convert tests to use TAIL_ALLOC_OBJECT_CONST_PTR macro
with the following sed expression:

sed -ri \
's/^([[:space:]]*)(([^*]+[[:alnum:]_])( \*)?) *\*( *const )?([^ =]+) = tail_alloc\(sizeof\((\2|\*\6)\)\);/\1TAIL_ALLOC_OBJECT_CONST_PTR(\2, \6);/' \
tests/*.c

tests: use TAIL_ALLOC_OBJECT_VAR_PTR

Automatically convert tests to use TAIL_ALLOC_OBJECT_VAR_PTR macro
with the following sed expression:

sed -ri \
's/^([[:space:]]*)(([^*]+[[:alnum:]_])( \*)?) *\*([^ =]+) = tail_alloc\(sizeof\((\2|\*\5)\)\);/\1TAIL_ALLOC_OBJECT_VAR_PTR(\2, \5);/' \
tests/{move_pages,net-sockaddr,sendfile}.c

tests: add TAIL_ALLOC_OBJECT_{CONST,VAR}_PTR to tests.h

Introduce a new macros for the most widespread use of tail_alloc.

* tests/tests.h (TAIL_ALLOC_OBJECT_CONST_PTR,
TAIL_ALLOC_OBJECT_VAR_PTR): New macros.

Decode RUSAGE_THREAD

* xlat/usagewho.in: Add values for existing entities, add
RUSAGE_THREAD.
* tests/getrusage.c: Test decoding of RUSAGE_THREAD.

tests/sched.test: use heredoc in order to avoid spawning of subprocess

Pipelined commands executed in subprocesses (some shells have special
provision for last command in the pipeline, but it is not guaranteed
and not POSIX), so exit codes of these subprocesses can be lost.
In order to avoid creating subprocesses, input for read commands
is better to supply via heredoc and not pipe.

* tests/sched.test: Move test cases to heredoc.

tests: do not skip sched.test if one of its subtests skips

* tests/sched.test (try_run_prog): New function.
Use it instead of run_prog.

tests: do not check decoding of setitimer syscall outside xetitimer.test

xetitimer.test already implements a comprehensive test of setitimer
syscall parser, no need to duplicate its parts in other tests.

* tests/clock_nanosleep.c (main): Remove setitimer expected output.
* tests/nanosleep.c (main): Likewise.
* tests/clock_nanosleep.test: Remove setitimer from the trace set.
* tests/nanosleep.test: Likewise.

tests: check decoding of getitimer and setitimer corner cases

* tests/sched_xetattr.c: Include <unistd.h> and <asm/unistd.h>.
(main): Check that pointer and integer arguments of getitimer
and setitimer syscalls are decoded properly.
* tests/xetitimer.test: Add -a option.

tests: rewrite sigreturn syscall decoding check from match_grep to match_diff

Unlike the former test that was based on match_grep,
the new one uses match_diff and does more rigorous testing.

* tests/sigreturn.c: Rewrite.
* tests/sigreturn.test: Likewise.

ia64, mips, x86_64: remove no longer used parsers of sigreturn syscalls

As there is no sigreturn syscall on ia64, mips n32, mips n64, x32,
and x86_64, no longer used parsers could be safely removed.

* linux/ia64/arch_sigreturn.c: Remove.
* Makefile.am (EXTRA_DIST): Remove it.
* linux/mips/arch_sigreturn.c (arch_sigreturn): Remove [!LINUX_MIPSO32].
* linux/x86_64/arch_sigreturn.c (arch_sigreturn): Remove.

Move sigreturn parser to libstrace

All architectures have rt_sigreturn, but only old ones also have
sigreturn.  Since not all architectures need a parser of sigreturn
syscall, remove the warning and move the parser to libstrace.

* Makefile.am (strace_SOURCES): Move sigreturn.c ...
(libstrace_a_SOURCES): ... here.
* linux/arch_sigreturn.c: Remove warning.

tests: check decoding of rt_sigreturn syscall

* tests/rt_sigreturn.c: New file.
* tests/rt_sigreturn.test: New test.
* tests/.gitignore: Add rt_sigreturn.
* tests/Makefile.am (check_PROGRAMS): Likewise.
(DECODER_TESTS): Add rt_sigreturn.test.

Implement proper decoding of rt_sigreturn syscall

* rt_sigreturn.c: New file.
* Makefile.am (strace_SOURCES): Add it.
* linux/dummy.h (sys_rt_sigreturn): Remove.
* linux/64/syscallent.h (rt_sigreturn): Change sys_func to rt_sigreturn.
* linux/hppa/syscallent.h (rt_sigreturn): Likewise.
* linux/ia64/syscallent.h (rt_sigreturn): Likewise.
* linux/s390/syscallent.h (rt_sigreturn): Likewise.
* linux/s390x/syscallent.h (rt_sigreturn): Likewise.
* linux/x86_64/syscallent.h (rt_sigreturn): Likewise.
* linux/x32/syscallent.h (rt_sigreturn, 64:rt_sigreturn): Likewise.
* NEWS: Mention this change.

Introduce get_rt_sigframe_addr function

Add get_rt_sigframe_addr function for all supported architectures.
It is going to be used in a parser of rt_sigreturn syscall.

* defs.h (get_rt_sigframe_addr): New function prototype.
* rt_sigframe.c: New file.
* Makefile.am (strace_SOURCES): Add it.
* linux/aarch64/arch_rt_sigframe.c: New file.
* linux/alpha/arch_rt_sigframe.c: Likewise.
* linux/arc/arch_rt_sigframe.c: Likewise.
* linux/arm/arch_rt_sigframe.c: Likewise.
* linux/avr32/arch_rt_sigframe.c: Likewise.
* linux/bfin/arch_rt_sigframe.c: Likewise.
* linux/crisv10/arch_rt_sigframe.c: Likewise.
* linux/crisv32/arch_rt_sigframe.c: Likewise.
* linux/hppa/arch_rt_sigframe.c: Likewise.
* linux/i386/arch_rt_sigframe.c: Likewise.
* linux/ia64/arch_rt_sigframe.c: Likewise.
* linux/m68k/arch_rt_sigframe.c: Likewise.
* linux/metag/arch_rt_sigframe.c: Likewise.
* linux/microblaze/arch_rt_sigframe.c: Likewise.
* linux/mips/arch_rt_sigframe.c: Likewise.
* linux/nios2/arch_rt_sigframe.c: Likewise.
* linux/or1k/arch_rt_sigframe.c: Likewise.
* linux/powerpc/arch_rt_sigframe.c: Likewise.
* linux/powerpc64/arch_rt_sigframe.c: Likewise.
* linux/riscv/arch_rt_sigframe.c: Likewise.
* linux/s390/arch_rt_sigframe.c: Likewise.
* linux/s390x/arch_rt_sigframe.c: Likewise.
* linux/sh/arch_rt_sigframe.c: Likewise.
* linux/sh64/arch_rt_sigframe.c: Likewise.
* linux/sparc/arch_rt_sigframe.c: Likewise.
* linux/sparc64/arch_rt_sigframe.c: Likewise.
* linux/tile/arch_rt_sigframe.c: Likewise.
* linux/x32/arch_rt_sigframe.c: Likewise.
* linux/x86_64/arch_rt_sigframe.c: Likewise.
* linux/xtensa/arch_rt_sigframe.c: Likewise.
* Makefile.am (EXTRA_DIST): Add them.

Introduce struct_rt_sigframe type

Add rt_sigframe.h files with definitions of struct_rt_sigframe type
for all supported architectures.
These definitions are going to be used in a parser of rt_sigreturn
syscall.

* linux/rt_sigframe.h: New file.
* linux/bfin/rt_sigframe.h: Likewise.
* linux/crisv10/rt_sigframe.h: Likewise.
* linux/crisv32/rt_sigframe.h: Likewise.
* linux/hppa/rt_sigframe.h: Likewise.
* linux/i386/rt_sigframe.h: Likewise.
* linux/ia64/rt_sigframe.h: Likewise.
* linux/m68k/rt_sigframe.h: Likewise.
* linux/mips/rt_sigframe.h: Likewise.
* linux/powerpc64/rt_sigframe.h: Likewise.
* linux/s390/rt_sigframe.h: Likewise.
* linux/s390x/rt_sigframe.h: Likewise.
* linux/sh64/rt_sigframe.h: Likewise.
* linux/sparc/rt_sigframe.h: Likewise.
* linux/sparc64/rt_sigframe.h: Likewise.
* linux/tile/rt_sigframe.h: Likewise.
* linux/x32/rt_sigframe.h: Likewise.
* linux/x86_64/rt_sigframe.h: Likewise.
* Makefile.am (EXTRA_DIST): Add them.

unwind.c: fix a possible buffer overflow

Linux does not prevent a user from creating a lot of nested directories
with length of the absolute path of the deepest one exceeding PATH_MAX,
then chdir'ing into it, creating a file there and mmap'ing it. Since the
length of the prefix preceding the pathname in /proc/[pid]/maps is not
necessary 80 (it's 73 on my machine), an overflow is possible.

* unwind.c (build_mmap_cache): Fix a possible buffer overflow.

util.c: remove a wrong comment

4924dbd6d750665cf383b20ab4fd67e48219ab91 modified the return type, but
not the comment.

riscv: export riscv_sp_ptr

Export SP register for later use by get_rt_sigframe_addr.

* linux/riscv/arch_regs.h: New file.
* Makefile.am (EXTRA_DIST): Add it.
* linux/riscv/arch_regs.c (riscv_sp_ptr): New variable.

or1k: export or1k_sp_ptr

Export SP register for later use by get_rt_sigframe_addr.

* linux/or1k/arch_regs.h: New file.
* Makefile.am (EXTRA_DIST): Add it.
* linux/or1k/arch_regs.c (or1k_sp_ptr): New variable.

nios2: export nios2_sp_ptr

Export SP register for later use by get_rt_sigframe_addr.

* linux/nios2/arch_regs.h: New file.
* Makefile.am (EXTRA_DIST): Add it.
* linux/nios2/arch_regs.c (nios2_sp_ptr): New variable.

metag: export metag_sp_ptr

Export SP register for later use by get_rt_sigframe_addr.

* linux/metag/arch_regs.h: New file.
* Makefile.am (EXTRA_DIST): Add it.
* linux/metag/arch_regs.c (metag_sp_ptr): New variable.

avr32: export avr32_sp_ptr

Export SP register for later use by get_rt_sigframe_addr.

* linux/avr32/arch_regs.h: New file.
* Makefile.am (EXTRA_DIST): Add it.
* linux/avr32/arch_regs.c (avr32_sp_ptr): New variable.

arc: export arc_sp_ptr

Export SP register for later use by get_rt_sigframe_addr.

* linux/arc/arch_regs.h: New file.
* Makefile.am (EXTRA_DIST): Add it.
* linux/arc/arch_regs.c (arc_sp_ptr): New variable.

Introduce print_sigset_addr function

As the definition of NSIG_BYTES is based on NSIG defined in <signal.h>,
NSIG_BYTES cannot be used in files that use kernel sigset_t.

Add another wrapper around print_sigset_addr_len_limit function that
takes one argument less than print_sigset_addr_len wrapper.  This new
wrapper is going to be used in cases when the length argument is equal
to NSIG_BYTES.

* defs.h (print_sigset_addr): New function prototype.
* signal.c (print_sigset_addr): New function.
* linux/alpha/arch_sigreturn.c (arch_sigreturn): Replace
print_sigset_addr_len with print_sigset_addr.
* linux/arm/arch_sigreturn.c (arch_sigreturn): Likewise.
* linux/crisv10/arch_sigreturn.c (arch_sigreturn): Likewise.
* linux/ia64/arch_sigreturn.c (arch_sigreturn): Likewise.
* linux/microblaze/arch_sigreturn.c (arch_sigreturn): Likewise.
* linux/mips/arch_sigreturn.c (arch_sigreturn): Likewise.
* linux/tile/arch_sigreturn.c (arch_sigreturn): Likewise.
* linux/x86_64/arch_sigreturn.c (arch_sigreturn): Likewise.

README.md: rework guidelines about sending bug reports

Update information on how to build strace from git repository

* INSTALL-git.md: Describe how to build strace from git repository.
* README.md: Add reference to INSTALL-git.md.
* README-hacking: Likewise.

README.md: fix references to in-tree files

* README.md: Change references to COPYING and NEWS files from absolute
to relative.

INSTALL: regenerate from install.texi

Regenerate INSTALL from install.texi using the following command:
makeinfo --plaintext install.texi > INSTALL

* INSTALL: Regenerate from install.texi.

install.texi: remove irrelevant sections

Remove "Multiple Architectures" and "Particular Systems" sections using
the following filter script:

awk '/^@node (Multiple Architectures|Particular Systems)/{skip=1;next}
/^@node/{skip=0} {if(!skip)print}'

* install.texi (Multiple Architectures, Particular Systems): Remove.

install.texi: import from GNU Autoconf

install.texi from GNU Autoconf is the ultimate source of INSTALL file.
This edition of install.texi has been downloaded from
https://git.savannah.gnu.org/cgit/autoconf.git/plain/doc/install.texi?id=63f3c78cdb0ccc85751543e387ef2a7252d5f0a2

* install.texi: Import from GNU Autoconf.

Implement -e trace=%sched option for tracing sched_* syscalls

Based on the patch by Md Haris Iqbal
(https://sourceforge.net/p/strace/mailman/message/35111320/)

linux/*/syscallent.h part is modified automatically by:

    git grep -Fl 'SEN(sched_' linux/ | xargs sed -i \
        's/0\(,[[:space:]]*SEN(sched_\)/TSC\1/'

* sysent.h (TRACE_SCHED): New definition.
* syscall.c: Alias TSC to TRACE_SCHED around syscallent.h inclusion.
* linux/32/syscallent.h: Add TSC flag for sched_* sycalls.
* linux/64/syscallent.h: Likewise.
* linux/alpha/syscallent.h: Likewise.
* linux/arm/syscallent.h: Likewise.
* linux/avr32/syscallent.h: Likewise.
* linux/bfin/syscallent.h: Likewise.
* linux/crisv10/syscallent.h: Likewise.
* linux/hppa/syscallent.h: Likewise.
* linux/i386/syscallent.h: Likewise.
* linux/ia64/syscallent.h: Likewise.
* linux/m68k/syscallent.h: Likewise.
* linux/microblaze/syscallent.h: Likewise.
* linux/mips/syscallent-n32.h: Likewise.
* linux/mips/syscallent-n64.h: Likewise.
* linux/mips/syscallent-o32.h: Likewise.
* linux/powerpc/syscallent.h: Likewise.
* linux/powerpc64/syscallent.h: Likewise.
* linux/s390/syscallent.h: Likewise.
* linux/s390x/syscallent.h: Likewise.
* linux/sh/syscallent.h: Likewise.
* linux/sh64/syscallent.h: Likewise.
* linux/sparc/syscallent.h: Likewise.
* linux/sparc64/syscallent.h: Likewise.
* linux/x32/syscallent.h: Likewise.
* linux/x86_64/syscallent.h: Likewise.
* linux/xtensa/syscallent.h: Likewise.
* qualify.c (lookup_class): Add TRACE_SCHED for "%sched".
* tests/ksysent.c: Define TSC to 0.
* tests/nsyscalls.c: Likewise.
* tests/sched.test: New test.
* tests/Makefile.am (DECODER_TESTS): Add sched.test.
* strace.1 (.SS Filtering): Add information about %sched syscall class.
* NEWS: Mention this change.

Co-authored-by: Md Haris Iqbal <haris.phnx@gmail.com>

Add "%" prefix for syscall classes in qualify

(as suggested in
https://www.mail-archive.com/strace-devel@lists.sourceforge.net/msg05147.html )

In order to move them to a different namespace than syscall names. This is
already a problem in case of ipc class which shadows ipc syscall.

Old behaviour is retained in order to preserve backwards compatibility.

* qualify.c (lookup_class) <syscall_class>: Add %-prefixed class definitions.
* strace.1 (.SS Filtering): Add information regarding %-prefixed class
syntax, declare legacy class syntax deprecated.
* tests/net.test: Update to use %-prefixed syscall class name.
* tests/netlink_protocol.test: Likewise.
* tests/qual_fault-exit_group.test: Likewise.
* tests/qual_syscall.test: Likewise.
* tests/scm_rights-fd.test: Likewise.
* tests/sigreturn.test: Likewise.
* tests/uio.test: Likewise.
* NEWS: Mention this change.

tests: simplify print_time_t

* tests/print_time.c (print_time_t): Treat localtime errors as fatal.

Update homepage URL

* README: Change homepage URL to https://strace.io
* debian/control: Likewise.
* strace.spec.in: Likewise.

tests: transform print_time_t into print_time_t_nsec

* tests/print_time.c (print_time_t): Rename to print_time_t_nsec,
take second argument and print it.
* tests/tests.h (print_time_t): Rename to print_time_t_nsec,
add second argument.
* tests/utime.c (main): Use print_time_t_nsec instead of print_time_t.
* tests/xstatx.c (print_stat): Likewise.  Pass nanoseconds
to print_time_t_nsec instead of printing them.

tests: use print_time_t in utime.test

* tests/utime.c (print_tm): Remove.
(main): Use print_time_t instead of print_tm.

tests: move print_time function to libtests

Rename print_time function to print_time_t and move it to libtests.

* tests/print_time.c: New file.
* tests/Makefile.am (libtests_a_SOURCES): Add it.
* tests/tests.h (print_time_t): New prototype.
* tests/print_time.c (print_time): Remove.
(print_stat): Replace print_time with print_time_t.

tests: macroize printing of atime, mtime, and ctime fields in xstatx.c

Introduce a macro for printing similar time related fields.

* print_struct_stat.c (PRINT_ST_TIME): New macro.
(print_stat): Use it.

print_struct_stat.c: macroize printing of atime, mtime, and ctime fields

Introduce a macro for printing similar time related fields.

* print_struct_stat.c (PRINT_ST_TIME): New macro.
(print_struct_stat): Use it.

x32: fix decoding of flags argument of preadv2 and pwritev2 syscalls

x32 is the only linux architecture where preadv2 and pwritev2 syscalls
take 5 arguments instead of 6.

* io.c (PREADV2_PWRITEV2_FLAGS_ARG_NO): New macro.
(SYS_FUNC(preadv2), SYS_FUNC(pwritev2)): Use it.
* linux/x32/syscallent.h (preadv2, pwritev2): Change nargs to 5.
* NEWS: Mention this fix.
* tests/preadv2-pwritev2.c (main): Fix invocation of preadv2
and pwritev2 syscalls on x32.