xlat/gen.sh: disable file name globbing by default

As the script uses file name globbing only in one place,
disable it by default and enable it when necessary.

* xlat/gen.sh: Add -f to shebang.
(main): Enable file name globbing to generate the list of input files.

xlat/gen.sh: speedup, part 5

* xlat/gen.sh (gen_header): Process xlat line with sed only when "/*"
substring is present in it.

Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>

xlat/gen.sh: speedup, part 4

* xlat/gen.sh (cond_xlat): Use read instead of sed for xlat entry
parsing.

Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>

xlat/gen.sh: speedup, part 3

* xlat/gen.sh (cond_def): Use parameter substitution instead of sed
for xlat line parsing.

Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>

xlat/gen.sh: speedup, part 2

* xlat/gen.sh (gen_header): Use "grep -q" instead of "grep > /dev/null".

xlat/gen.sh: speedup, part 1

* xlat/gen.sh (cond_def, cond_xlat): Use printf builtin instead of cat.

xlat/gen.sh: cleanup

* xlat/gen.sh: Export LC_ALL=C so it could be omitted from individual
invocations.
(cond_def): Remove LC_ALL=C from sed invocation.
(gen_header): Remove LC_COLLATE=C.

Makefile.am: pass D variable to shell scripts' environment

And set -x if D is set to 1, so the commands called by various shell scripts
are easier to see during debugging.

* Makefile.am (bpf_attr_check.c, sen.h, mpers-m%.stamp, $(srcdir)/CREDITS): Pass
D variable in the environment to the shell script call.
* gen_bpf_attr_check.sh: Set -x if D is set to 1.
* generate_mpers_am.sh: Likewise.
* generate_sen.sh: Likewise.
* maint/gen-contributors-list.sh: Likewise.
* mpers.sh: Likewise.
* mpers_test.sh: Likewise.

tests: add checks for dumpstr output into read-write test

util.c:dumpstr() now aligns offsets in accordance with the total length
of the dump and also may perform only partial dump, so let's add checks
for these cases.

* tests/fill_memory.c (fill_memory_ex): Change the type of the period
argument from unsigned char to unsigned int.
* tests/tests.h (fill_memory_ex): Likewise.
* tests/read-write.c (dump_str_ex): Rename from dump_str, add idx_w
argument, support len greater than 240 bytes.
(dump_str): New function, wrapper for dump_str_ex with the default index
width.
(print_hex): Add checks for dumpstr output, close fd 1 later.

util: update dumpstr

Use a buffer of a limited size, use proper type for dump amount, avoid
hard-coding of byte counts, calculate output buffer size more accurately
and minimise its rewriting, pad offset with zeros in accordance
with expected output amount.

* defs.h (dumpstr): Change the type of len argument from int to
kernel_ulong_t.
* macros.h (ROUNDUP_DIV): New macro.
(ROUNDUP): Rewrite using ROUNDUP_DIV.
* util.c (ILOG2_ITER_): New macro.
(ilog2_64, ilog2_32): New functions.
(ilog2_klong): New macro, wrapper around ilog2_32/ilog2_64, so (potentially
more expensive) ilog2_64 is not used for ilog2 calculation
of a kernel_ulong_t-typed variable on architectures with 32-bit kernel long.
(dumpstr): Update.

Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>

Generalise UUID printing

It was open-coded (using yet another open-coded hexadecimal character
printing) in btrfs.c and can be used in other places (like dm.c or
rtnl_link.c).

* defs.h (print_uuid): New declaration.
* print_fields.h (PRINT_FIELD_UUID): New macro.
* util.c (print_uuid): New function.
* btrfs.c (prnibble, UUID_STRING_SIZE, btrfs_unparse_uuid): Remove.
(btrfs_ioctl): Use PRINT_FIELD_UUID for UUID printing.

Generalise some printing primitives

Character class checks and hexadecimal number formatting are open-coded
all over the place, let's try to de-duplicate them a bit.

* print_utils.h: New file.
* Makefile.am (strace_SOURCES): Add it.
* util.c: Include "print_utils.h".
(string_quote, dumpstr): Use sprint_byte_hex and is_print.
* v4l2.c: Include "print_utils.h".
(print_pixelformat): Use is_print and BYTE_HEX_CHARS_PRINTF_QUOTED,
add a note that the routine is rather generic.

Move call_summary() from cleanup() to terminate()

cleanup() has exactly two call sites, die() and terminate(), and the
first one resets cflag in order to prevent call_summary() invocation.
Move the call to terminate() in order to avoid bogus cflag reset.

* strace.c (die): Remove cflag reset.
(cleanup): Move call_summary() call ...
(terminate): ... here.

defs.h: define stack_trace_enabled to 0 is stack tracing is not enabled

This allows avoiding ifdefs sometimes.

* defs.h [!ENABLE_STACKTRACE] (stack_trace_enabled): Define as 0.
* strace.c (init): Remove #ifdef ENABLE_STACKTRACE around -c/-k check.

build: fix --with-libiberty

* m4/st_demangle.m4 (st_DEMANGLE): Move the check for cplus_demangle
out of AC_CHECK_HEADERS because the latter checks for demangle.h in two
different places and an absence of demangle.h in one of these places
would cause a build error in --with-libiberty=yes mode.
* NEWS: Mention this fix.

Resolves: https://github.com/strace/strace/issues/92

Honor xlat styles when decoding ioprio_get and ioprio_set

* ioprio.c (SYS_FUNC(ioprio_get), SYS_FUNC(ioprio_set)): Add xlat_style
support.
* tests/ioprio-Xabbrev.c: New file.
* tests/ioprio-Xraw.c: Likewise.
* tests/ioprio-Xverbose.c: Likewise.
* tests/ioprio.c: Handle XLAT_RAW, XLAT_ABBREV, and XLAT_VERBOSE macros.
* tests/gen_tests.in (ioprio-Xabbrev, ioprio-Xraw, ioprio-Xverbose): New
tests.
* tests/pure_executables.list: Add ioprio-Xabbrev, ioprio-Xraw, and
ioprio-Xverbose.
* tests/.gitignore: Likewise.

Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>

move_pages: honor xlat styles

* numa.c (print_status): Add xlat_style support for status argument.
* tests/move_pages-Xabbrev.c: New file.
* tests/move_pages-Xraw.c: Likewise.
* tests/move_pages-Xverbose.c: Likewise.
* tests/move_pages.c: Handle XLAT_RAW, XLAT_ABBREV, and XLAT_VERBOSE
macros.
* tests/gen_tests.in (move_pages-Xabbrev, move_pages-Xraw,
move_pages-Xverbose): New tests.
* tests/pure_executables.list: Add move_pages-Xabbrev, move_pages-Xraw,
and move_pages-Xverbose.
* tests/.gitignore: Likewise.

tests: robustify threads-execve test against the odds

Give threads-execve.test more chances to succeed.

* tests/threads-execve.test: Retry the test until run out of time.

Honor xlat styles when decoding resource limits

* resource.c (sprint_rlim64, sprint_rlim32): Remove.
(print_rlim64_t, print_rlim32_t): New functions.
(print_rlimit64, print_rlimit32): Use them.
* tests/setrlimit-Xabbrev.c: New file.
* tests/setrlimit-Xraw.c: Likewise.
* tests/setrlimit-Xverbose.c: Likewise.
* tests/setrlimit.c (main): Handle XLAT_ABBREV, XLAT_RAW,
and XLAT_VERBOSE macros.
* tests/xgetrlimit.c (sprint_rlim): Likewise.
* tests/gen_tests.in (setrlimit-Xabbrev, setrlimit-Xraw,
setrlimit-Xverbose): New tests.
* tests/pure_executables.list: Add setrlimit-Xabbrev, setrlimit-Xraw,
and setrlimit-Xverbose.
* tests/.gitignore: Likewise.

Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>

hppa: workaround kernel bug in syscall number tampering

Linux kernel commit v4.6-rc2~20^2 introduced a regression:
when tracer changes syscall number to -1, the kernel fails
to initialize %r28 with -ENOSYS and subsequently fails
to return the error code of the failed syscall to userspace.
Workaround this by initializing %r28 ourselves.

* linux/arch_defs_.h (ARCH_NEEDS_SET_ERROR_FOR_SCNO_TAMPERING): Define
to 0.
* linux/hppa/arch_defs_.h (ARCH_NEEDS_SET_ERROR_FOR_SCNO_TAMPERING):
Define to 1.
* syscall.c (tamper_with_syscall_entering)
[ARCH_NEEDS_SET_ERROR_FOR_SCNO_TAMPERING]: When changing syscall number
to -1, set the return value as well.

hppa: define PT_* constants as offsets inside struct pt_regs

Define constants passed to upeek and upoke using a method that works
with different wordsize values.

* linux/hppa/arch_regs.c (PT_GR26, PT_GR30, PT_IAOQ0, PT_IAOQ1): Remove.
(PT_GR20, PT_GR28, ARCH_PC_PEEK_ADDR, ARCH_SP_PEEK_ADDR): Redefine using
offsets inside struct pt_regs.
* linux/hppa/get_syscall_args.c (arch_get_syscall_args): Replace PT_GR26
with offsets inside struct pt_regs.

hppa: enhance decoding of PTRACE_PEEKUSER and PTRACE_POKEUSER

Print symbolic constants corresponding to numeric arguments
of PTRACE_PEEKUSER and PTRACE_POKEUSER requests.

* linux/hppa/userent.h: New file.
* Makefile.am (EXTRA_DIST): Add it.
* NEWS: Mention this.

mips o32: fix 7th syscall argument with PTRACE_GET_SYSCALL_INFO API

As PTRACE_GET_SYSCALL_INFO API supports 6 syscall arguments,
all architectures that have syscalls with more than 6 arguments
(i.e. mips o32) have to fetch extra arguments manually when using
PTRACE_GET_SYSCALL_INFO API.

* linux/mips/get_syscall_args.c [LINUX_MIPSO32]
(arch_get_syscall_args_extra): New function.
* syscall.c (get_syscall_args) [MAX_ARGS > 6]: Use it.

Fixes: v4.26~49 "Introduce PTRACE_GET_SYSCALL_INFO support"

mips: update comment

* linux/mips/get_syscall_args.c (decode_syscall_subcall): Update comment.

Complements: v4.26-27-g2c8b6de91 "mips o32: fix build"

tests: add kill_child test

This tests repeatedly creates and kills children, so some corner
cases in handling of not-quite-existing processes can be observed.

Previously, strace was crashing in the following situation:

    13994 ????( <unfinished ...>
    ...
    13994 <... ???? resumed>) = ?

as tcp->s_ent wasn't initialised on syscall entering and
strace.c:print_event_exit segfaulted when tried to access
tcp->s_ent->sys_name.

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

Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>

Wire up kexec_file_load syscall on architectures that use generic unistd.h

* linux/32/syscallent.h [294]: Wire up kexec_file_load syscall
introduced by linux commit v5.0-rc1~35^2~41^2~15.
* linux/64/syscallent.h [294]: Likewise.
* NEWS: Mention this.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1676045

Wire up rseq syscall on architectures that use generic unistd.h

* linux/32/syscallent.h [293]: Wire up rseq syscall introduced by linux
commit v4.19-rc1~109^2~47.
* linux/64/syscallent.h [293]: Likewise.
* NEWS: Mention this.

tests: robustify preadv2-pwritev2 test against odd kernels

The test used to assume that either both preadv2 and pwritev2 syscalls
are implemented or both are not implemented, but, apparently, there are
kernels in the wild that implement just preadv2 syscall without
pwritev2.

* tests/preadv2-pwritev2.c (main): Skip the dumpio part of the test
if either preadv2 or pwritev2 syscall is not implemented.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1668750

ptrace_restart: do not print diagnostics when ptrace returns ESRCH

After some discussion, it was decided that the situation
when the tracee is gone does not worth reporting.

* strace.c (ptrace_restart): Return early if ptrace returned ESRCH.

Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1662936

ptrace_restart: use xlat-based approach for printing ptrace requests

* defs.h (ptrace_cmds): New prototype.
* strace.c (ptrace_op_str): New function.
(ptrace_restart): Use it.

Fix whitespace issues

* Makefile.am (strace_SOURCES, EXTRA_DIST): Replace SPACE symbol followed
by TAB symbol with TAB symbol.
* kvm.c (is_map_for_file): Likewise.
* tests/gen_tests.in (ioctl_ptp, printsignal-Xverbose): Likewise.
* xlat/skf_ad.in: Likewise.

Make inline message on failed restart attempt more verbose

Hopefully, now it is less confusing.

* strace.c (ptrace_restart): Provide intent and pid in the inline error
message.

References: https://bugzilla.redhat.com/show_bug.cgi?id=1662936

syscall.c: set MEMORY_MAPPING_CHANGE in stub sysent

As unknown syscalls may incur unknown side effects.

* syscall.c (stub_sysent): Set sys_flags to MEMORY_MAPPING_CHANGE.

Use accessors for tcp->s_ent, return a stub struct if it is NULL

Since code paths are non-trivial, it's an attempt to future-proof
and prevent improper access of tcp->s_ent fields.

* defs.h (struct tcb): Update the description of s_ent field.
(stub_sysent): New declaration.
(tcp_sysent, n_args): New macro functions.
(indirect_ipccall): Use tcp_sysent() instead of tcp->s_ent.
* ipc.c (SYS_FUNC(ipc)): Use n_args() instead of tcp->s_ent->nargs.
* linux/alpha/get_syscall_args.c (get_syscall_args): Likewise.
* linux/bfin/get_syscall_args.c (get_syscall_args): Likewise.
* linux/hppa/get_syscall_args.c (get_syscall_args): Likewise.
* linux/ia64/get_syscall_args.c (get_syscall_args): Likewise.
* linux/microblaze/get_syscall_args.c (get_syscall_args): Likewise.
* linux/mips/get_syscall_args.c (get_syscall_args): Likewise.
* linux/sh/get_syscall_args.c (get_syscall_args): Likewise.
* linux/sh64/get_syscall_args.c (get_syscall_args): Likewise.
* linux/x86_64/get_syscall_args.c (get_syscall_args): Likewise.
* linux/xtensa/get_syscall_args.c (get_syscall_args): Likewise.
* prctl.c (print_prctl_args): Likewise.
* signal.c (SYS_FUNC(sgetmask)): Likewise.
* util.c (printargs, printargs_u, printargs_d): Likewise.
* syscall.c (decode_ipc_subcall, decode_syscall_subcall: Likewise.
(dumpio, tamper_with_syscall_exiting, syscall_entering_decode,
syscall_entering_decode, syscall_entering_trace, syscall_entering_trace,
syscall_exiting_decode, print_syscall_resume, syscall_exiting_trace,
get_syscall_result): Use tcp_sysent() instead of tcp->s_ent.
(stub_sysent): New stub sysent.
(get_scno): Reset scno, s_ent, qual_flg; initialise s->ent from
stub_sysent.
* pathtrace.c (pathtrace_match_set): Use tcp_sysent() instead of
tcp->s_ent.

Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>

syscall.c: remove arch check for SEN_execv usage

SEN_* declarations are always present and can be used regardless
of architecture.

* syscall.c (syscall_entering_trace): Remove "#if defined SPARC ||
defined SPARC64" guard.

Merge "<... resumed>" printing

Apparently, it was slightly different with no apparent reason.
Use a single routine to print this message now.

* defs.h (print_syscall_resume): New function declaration.
* strace.c (print_event_exit): Replace open-coding of "<... resumed>"
message printing with a print_syscall_resume() call.
* syscall.c (syscall_exiting_trace): Likewise.
(print_syscall_resume): New function.
* tests/threads-execve.c: Update expected output.

sockaddr: print sin6_flowinfo field before sin6_addr

The sin6_flowinfo field comes before sin6_addr in the sockaddr_in6
defintion, but for some reason we switch the order when decoding.
This patch fixes the order of decoding.

* sockaddr.c (print_sockaddr_data_in6): Print sin6_flowinfo field
before sin6_addr.
* NEWS: Mention this fix.
* tests/group_req.c (main): Update expected output.
* tests/net-sockaddr.c (check_in6_linklocal, check_in6): Likewise.
* tests/net-yy-inet6.c (INADDR_STR, SA_FIELDS): Likewise.
* tests/sockaddr_xlat.c (validate_in6): Likewise.

mips o32: fix build

Commit 917c2ccf3a67 "Refactor stack pointers" moved mips_REG_* macros
from linux/mips/arch_regs.h to linux/mips/arch_regs.c because these
macros are no longer used outside syscall.c or files included by
syscall.c, but this caused a build regression on mips o32 because
decode_syscall_subcall() uses mips_REG_SP prior to its definition.

* syscall.c (decode_syscall_subcall): Move ...
* linux/mips/get_syscall_args.c: ... here.
* NEWS: Mention this fix.

Reported-by: Baruch Siach <baruch@tkos.co.il>
Fixes: v4.26~61 "Refactor stack pointers"

Fix build for no-MMU targets

Commit 7488ce9e23f1 "Check whether PTRACE_GET_SYSCALL_INFO is supported
by the kernel" added a fork() call in test_ptrace_get_syscall_info()
which is included in the main strace executable code.  Although the
test_ptrace_get_syscall_info() routine is not called on no-MMU targets,
the compiler can't optimize it out because it is a global symbol.
So build for no-MMU targets currently fails:

strace-ptrace_syscall_info.o: In function `test_ptrace_get_syscall_info':
ptrace_syscall_info.c:(.text+0x1c): undefined reference to `fork'

* ptrace_syscall_info.c (test_ptrace_get_syscall_info): Make
the definition depend on HAVE_FORK.
* strace.c (init): Call test_ptrace_get_syscall_info unconditionally.
* NEWS: Mention this fix.

Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>
Fixes: v4.26~50 "Check whether PTRACE_GET_SYSCALL_INFO is supported by the kernel"

linux/mips/.gitignore: drop copyright header

The '/*' in the first line of the copyright header matches all files in
that directory.  No other .gitignore file has this header.  Drop it.

* linux/mips/.gitignore: Remove copyright header.

Fixes: v4.26~23 "Add copyright headers to some files that lack them"

Honor xlat styles when decoding sockaddr_in, sockaddr_in6, and sockaddr_ll

* print_fields.h (PRINT_FIELD_NET_PORT): Handle xlat styles.
* sockaddr.c (print_sll_protocol): New function.
(print_sockaddr_data_ll, print_inet_addr, print_sockaddr_data_in6):
Handle xlat styles.
* NEWS: Mention this.
* tests/sockaddr_xlat.c: New file.
* tests/sockaddr_xlat-Xabbrev.c: Likewise.
* tests/sockaddr_xlat-Xraw.c: Likewise.
* tests/sockaddr_xlat-Xverbose.c: Likewise.
* tests/Makefile.am (EXTRA_DIST): Add sockaddr_xlat.c.
* tests/gen_tests.in (sockaddr_xlat-Xabbrev, sockaddr_xlat-Xraw,
sockaddr_xlat-Xverbose): New tests.
* tests/pure_executables.list: Add sockaddr_xlat-Xabbrev,
sockaddr_xlat-Xraw, and sockaddr_xlat-Xverbose.
* tests/.gitignore: Likewise.

Remove PRINT_FIELD_INET4_ADDR

Reduce code duplication by removing PRINT_FIELD_INET4_ADDR
and using PRINT_FIELD_INET_ADDR instead.

* print_fields.h (PRINT_FIELD_INET4_ADDR): Remove.
* msghdr.c (print_cmsg_ip_pktinfo): Use PRINT_FIELD_INET_ADDR
instead of PRINT_FIELD_INET4_ADDR.
* net.c (print_mreq): Likewise.
* sockaddr.c (print_sockaddr_data_in): Likewise.

xlat: update REL_* constants

* xlat/evdev_relative_axes.in (REL_HWHEEL_HI_RES): New constant
introduced by Linux kernel commit v5.0-rc1~18^2^7~7.
* NEWS: Mention this.

xlat: update UDP_* constants

* xlat/sock_udp_options.in (UDP_GRO): New constant introduced
by Linux kernel commit v5.0-rc1~129^2~379^2~8.
* NEWS: Mention this.

xlat: update FAN_* constants

* xlat/fan_event_flags.in (FAN_OPEN_EXEC, FAN_OPEN_EXEC_PERM): New
constants introduced by Linux kernel commits v5.0-rc1~124^2~5
and v5.0-rc1~124^2~3, respectively.
* NEWS: Mention this.
* tests/fanotify_mark.c (main): Update expected output.

xlat: update SCTP_* constants

* xlat/sock_sctp_options.in (SCTP_EVENT): New constant introduced
by Linux kernel commit v5.0-rc1~129^2~255^2.
* NEWS: Mention this.

xlat: update IFLA_* constants

* xlat/rtnl_ifla_info_data_bridge_attrs.in (IFLA_BR_MULTI_BOOLOPT): New
constant introduced by Linux kernel commit v5.0-rc1~129^2~207^2~2.
* NEWS: Mention this.
* tests/nlattr_ifla_linkinfo.c (main): Update.

xlat: update NETNSA_* constants

* xlat/rtnl_nsid_attrs.in (NETNSA_TARGET_NSID, NETNSA_CURRENT_NSID): New
constants introduced by Linux kernel commits v5.0-rc1~129^2~201^2~2
and v5.0-rc1~129^2~201^2, respectively.
* rtnl_nsid.c (rtgenmsg_nla_decoders): Add NETNSA_TARGET_NSID
and NETNSA_CURRENT_NSID.
* NEWS: Mention this.

xlat: update SECCOMP_* constants

* xlat/seccomp_ops.in (SECCOMP_GET_NOTIF_SIZES): New constant introduced
by Linux kernel commit v5.0-rc1~66^2~1^2~1.
* xlat/seccomp_ret_action.in (SECCOMP_RET_USER_NOTIF): Likewise.
* xlat/seccomp_filter_flags.in (SECCOMP_FILTER_FLAG_NEW_LISTENER):
Likewise.
* NEWS: Mention this.
* tests/seccomp-filter.c (main): Update expected output.
* tests/seccomp-filter-v.c (main): Likewise.
* tests/seccomp_get_action_avail.c (main): Check SECCOMP_RET_USER_NOTIF.

xlat: update NT_* constants

* xlat/nt_descriptor_types.in (NT_ARM_PAC_MASK, NT_MIPS_MSA): New
constants introduced by Linux kernel commits v5.0-rc1~35^2~21
and v5.0-rc1~30^2~58, respectively.
* NEWS: Mention this.

xlat: update PR_* constants

* xlat/prctl_options.in (PR_PAC_RESET_KEYS): New constant introduced
by Linux kernel commit v5.0-rc1~35^2~19.
* NEWS: Mention this.

xlat: update V4L2_* constants

* xlat/v4l2_buf_types.in (V4L2_BUF_TYPE_META_OUTPUT): New constant
introduced by Linux kernel commit v5.0-rc1~181^2~21.
* xlat/v4l2_device_capabilities_flags.in (V4L2_CAP_META_OUTPUT):
Likewise.
* xlat/v4l2_pix_fmts.in (V4L2_PIX_FMT_CNF4): New constant introduced
by Linux kernel commit v5.0-rc1~182^2~120.
* NEWS: Mention this.

xlat: update KVM_CAP_* constants

* xlat/kvm_cap.in (KVM_CAP_MANUAL_DIRTY_LOG_PROTECT,
KVM_CAP_HYPERV_CPUID): New constants introduced by Linux kernel commits
v5.0-rc1~156^2~115 and v5.0-rc1~156^2~74, respectively.
* NEWS: Mention this.

xlat: update NDA_* constants

* xlat/rtnl_neigh_attrs.in (NDA_PROTOCOL): New constant introduced
by Linux kernel commit v5.0-rc1~129^2~79.
* rtnl_neigh.c (ndmsg_nla_decoders): Add NDA_PROTOCOL.
* NEWS: Mention this.

xlat: update BTRFS_FEATURE_INCOMPAT_* constants

* xlat/btrfs_features_incompat.in
(BTRFS_FEATURE_INCOMPAT_METADATA_UUID): New constant introduced by Linux
kernel commit v5.0-rc1~126^2~64.
* NEWS: Mention this.

xlat: update *_MAGIC constants

* xlat/fsmagic.in (BINDERFS_SUPER_MAGIC): New constant introduced
by Linux kernel commit v5.0-rc1~95^2~15.
* NEWS: Mention this.

xlat: update KERN_* constants

* xlat/sysctl_kern.in (KERN_PANIC_ON_WARN, KERN_PANIC_PRINT): New
constants introduced by Linux kernel commits v3.19-rc1~135^2~91
and v5.0-rc1~38^2~16, respectively.
* configure.ac (AC_CHECK_DECLS): Add them.
* NEWS: Mention this.

xlat: update BPF_F_* constants

* xlat/bpf_map_flags.in (BPF_F_ZERO_SEED): New constant introduced
by Linux kernel commit v5.0-rc1~129^2~114^2~18^2~3.
* xlat/bpf_prog_flags.in (BPF_F_ANY_ALIGNMENT): New constant introduced
by Linux kernel commit v5.0-rc1~129^2~209^2~17^2~3.
* NEWS: Mention this.
* tests/bpf.c (BPF_MAP_CREATE_checks, BPF_PROG_LOAD_checks,
print_BPF_PROG_LOAD_attr3, print_BPF_PROG_LOAD_attr4): Update.

tests: fix prog_info initialization in bpf-obj_get_info_by_fd-prog*

The sys_bpf(BPF_OBJ_GET_INFO_BY_FD, &bpf_prog_get_info_attr, ...) is
called in a loop.  The bpf_prog_get_info_attr.info object is in size 104
but bpf_prog_get_info_attr.info_len is in size 168.  Hence, if the prog
is jited, the second iteration onwards will have nr_jited_ksyms == 1
which is asking the kernel to fill the
bpf_prog_get_info_attr.info.jited_ksyms and it is NULL.

* tests/bpf-obj_get_info_by_fd.c (main): Clear memory beyond prog_info
at the start of every iteration.

Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>

tests: use tail_alloc instead of calloc in bpf-obj_get_info_by_fd-prog*

This guarantees that map_info and prog_info objects are not accessed
out of bounds.

* tests/bpf-obj_get_info_by_fd.c: Include <string.h>.
(main): Use tail_alloc instead of calloc for map_info and prog_info.

Bring lists back to the sorted order

* .gitignore: Make the list sorted again.
* Makefile.am (strace_SOURCES): Likewise.
* tests/.gitignore: Likewise.
* tests/gen_tests.in: Likewise.
* tests/Makefile.am (check_PROGRAMS, DECODER_TESTS, EXTRA_DIST):
Likewise.

tests: fix strace-k.test on alpha

Change strace-k.test to use chdir syscall instead of getpid syscall
because the latter is not universally available, e.g. there is no getpid
syscall on alpha.

* tests/stack-fcall-3.c (f3) <default>: Replace getpid with chdir.
* tests/strace-k.test: Likewise.
* tests/strace-k.expected: Likewise.
* tests/strace-k-demangle.expected: Likewise.
* NEWS: Mention this.

Fix preprocessor indentation

Indent the C preprocessor directives to reflect their nesting
using the following script:

$ cppi -l $(git grep -El '^[[:space:]]*#[[:space:]]*(if|ifdef|ifndef|elif|else|endif|define|pragma)[[:space:]]' |grep -v '\.sh$') |while read f; do
cppi < "$f" > "$f".cppi; mv "$f".cppi "$f"
done

Post-release administrivia

* NEWS: Add a header line for the next release.
* debian/changelog.in: Add a changelog entry for 4.26-1.
* strace.spec.in: Likewise.

Prepare for 4.26 release

* NEWS: Update for 4.26 release.

strace.spec.in: add a comment about the license

Update ioctl entries from linux v4.20

* linux/32/ioctls_inc_align16.h: Update from linux v4.20
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/mips/ioctls_arch0.h: Likewise.
* linux/powerpc/ioctls_arch0.h: Likewise.
* linux/s390/ioctls_arch0.h: Likewise.
* linux/s390x/ioctls_arch0.h: Likewise.
* NEWS: Mention this.

maint: update for linux 4.20

* maint/ioctls_sym.sh: Include linux/compiler_attributes.h in every
processed file.
Use asm/ioctls.h workaround for asm-generic/ioctls.h too.

xlat: update BPF_* constants

* xlat/bpf_map_types.in (BPF_MAP_TYPE_PERCPU_CGROUP_STORAGE): New
constant introduced by Linux kernel commit v4.20-rc1~14^2~124^2~12^2~7.
(BPF_MAP_TYPE_QUEUE, BPF_MAP_TYPE_STACK): New constants introduced
by Linux kernel commit v4.20-rc1~151^2~32^2~11^2~3.
* xlat/bpf_commands.in (BPF_MAP_LOOKUP_AND_DELETE_ELEM): New constant
introduced by Linux kernel commit v4.20-rc1~151^2~32^2~11^2~2.
* tests/bpf.c (BPF_MAP_CREATE_checks): Update.

xlat: add PR_SPEC_INDIRECT_BRANCH to pr_spec_cmds

* xlat/pr_spec_cmds.in (PR_SPEC_INDIRECT_BRANCH): New constant,
introduced by Linux commit v4.20-rc5~4^2~3.
* prctl.c (SYS_FUNC(prctl)) <case PR_GET_SPECULATION_CTRL, case
PR_SET_SPECULATION_CTRL>: Add PR_SPEC_INDIRECT_BRANCH handling.
* tests/prctl-spec-inject.c (main): Add PR_SPEC_INDIRECT_BRANCH decoding
checks, update expected output.
* NEWS: Mention this.

Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>

xlat: update V4L2_CID_* and V4L2_PIX_FMT_* constants

* xlat/v4l2_control_ids.in (V4L2_CID_MPEG_VIDEO_MPEG2_SLICE_PARAMS,
V4L2_CID_MPEG_VIDEO_MPEG2_QUANTIZATION): New constants, introduced
by Linux commit v4.20-rc1~51^2~4.
* xlat/v4l2_pix_fmts.in (V4L2_PIX_FMT_MPEG2_SLICE): Likewise.
(V4L2_PIX_FMT_SUNXI_TILED_NV12): New constant, introduced by Linux
commit v4.20-rc1~51^2~3.
* NEWS: Mention this.

Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>

xlat: add ABS_RESERVED to evdev_abs

* xlat/evdev_abs.in (ABS_RESERVED): New constant, introduced by Linux
commit v4.20-rc1~133^2~2^2.
* NEWS: Mention this.

Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>

xlat: add REL_RESERVED and REL_WHEEL_HI_RES to evdev_relative_axes

* xlat/evdev_relative_axes.in (REL_RESERVED): New constant, introduced
by Linux commit v4.20-rc1~133^2~2^2.
(REL_WHEEL_HI_RES): New constant, introduced by Linux commit
v4.20-rc1~133^2~2^2~6 and updated by Linux commit v4.20-rc1~133^2~2^2.
* NEWS: Mention this.

Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>

xlat: update kvm_cap

* xlat/kvm_cap.in (KVM_CAP_NESTED_STATE): New constant, introduced
by Linux commit v4.19-rc1~87^2~62.
(KVM_CAP_ARM_INJECT_SERROR_ESR): New constant, introduced by Linux
commit v4.19-rc1~55^2~12^2~14, merged with its final value
in v4.19-rc1~55^2~12.
(KVM_CAP_MSR_PLATFORM_INFO): New constant, introduced by Linux commit
v4.19-rc5~8^2~2.
(KVM_CAP_PPC_NESTED_HV): New constant, introduced by Linux commit
v4.20-rc1~113^2~107^2~1.
(KVM_CAP_HYPERV_SEND_IPI): New constant, introduced by Linux commit
v4.20-rc1~113^2~72.
KVM_CAP_COALESCED_PIO): New constant, introduced by Linux commit
v4.20-rc1~113^2~31.
(KVM_CAP_HYPERV_ENLIGHTENED_VMCS): New constant, introduced by Linux
commit v4.20-rc1~113^2~25.
(KVM_CAP_EXCEPTION_PAYLOAD): New constant, introduced by Linux commit
v4.20-rc1~113^2~8.
(KVM_CAP_ARM_VM_IPA_SIZE): New constant, introduced by Linux commit
v4.20-rc1~113^2~5^2~8 and updated by Linux commit
v4.20-rc1~113^2~5.
* NEWS: Mention this.

Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>

xlat: add IFA_TARGET_NETNSID to rtnl_addr_attrs

* xlat/rtnl_addr_attrs.in (IFA_TARGET_NETNSID): New constant, introduced
by Linux commit v4.20-rc1~14^2~428^2~7.
* NEWS: Mention this.

Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>

xlat: update neighbor_cache_entry_flags

* xlat/neighbor_cache_entry_flags.in (NTF_OFFLOADED): New constant,
introduced by Linux commit v4.13-rc1~157^2~252^2~13.
(NTF_STICKY): New constant, introduced by Linux commit
v4.20-rc1~14^2~392.
(NTF_USE, NTF_SELF, NTF_MASTER, NTF_PROXY, NTF_EXT_LEARNED, NTF_ROUTER):
Add fallback definitions.
* NEWS: Mention this.

Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>

xlat: add flow dissector bpf program type constants

* xlat/bpf_attach_type.in (BPF_FLOW_DISSECTOR): New constant
introduced by Linux commit v4.20-rc1~14^2~259^2~9^2~4.
* xlat/bpf_prog_types.in (BPF_PROG_TYPE_FLOW_DISSECTOR): Likewise.
* NEWS: Mention this.
* tests/bpf.c (BPF_PROG_LOAD_checks, BPF_PROG_QUERY_checks): Update.
* tests/kernel_version.c (print_bpf_attr): Update.

Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>

rtnl_tc: add TCA_STATS_BASIC_HW

* xlat/rtnl_tca_stats_attrs.in (TCA_STATS_BASIC_HW): New constant,
introduced by Linux commit v4.20-rc1~14^2~274^2~1.
* rtnl_tc.c (tca_stats_nla_decoders): Add TCA_STATS_BASIC_HW.
* NEWS: Mention this.

Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>

xlat: add NETLINK_DUMP_STRICT_CHK to sock_netlink_options

* xlat/sock_netlink_options.in (NETLINK_DUMP_STRICT_CHK): New constant,
introduced by Linux commit v4.20-rc1~14^2~130^2~17.
* NEWS: Mention this.

Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>

xlat: add IFLA_BR_VLAN_STATS_PER_PORT to rtnl_ifla_info_data_bridge_attrs

* xlat/rtnl_ifla_info_data_bridge_attrs.in
(IFLA_BR_VLAN_STATS_PER_PORT): New constant, introduced by Linux commit
v4.20-rc1~14^2~90.
* rtnl_link.c (ifla_info_data_bridge_nla_decoders): Add
IFLA_BR_VLAN_STATS_PER_PORT.
* NEWS: Mention this.
* tests/nlattr_ifla_linkinfo.c (main): Check it.

Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>

xlat: add TCP_CLOSE to netlink_states

* xlat/netlink_states.in: Decode state 7 as TCP_CLOSE, since that's what
net core sets socket's initial state to.

xlat: add fallback definitions to setsock_ipv6_options

* xlat/setsock_ipv6_options.in: Add fallback definitions.

xlat: add SOL_CAN_* to socketlayers

* xlat/socketlayers.in (SOL_CAN_BASE): New constant, introduced by Linux
commit v2.6.25-rc1~1162^2~1414.
(SOL_CAN_RAW): New constant, introduced by Linux commit
v2.6.25-rc1~1162^2~1413.
* NEWS: Mention this.

Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>

xlat: add FAN_ENABLE_AUDIT and FAN_REPORT_TID to fan_init_flags

* xlat/fan_init_flags.in (FAN_ENABLE_AUDIT): New constant, introduced
by Linux commit v4.15-rc1~130^2^2~11.
(FAN_REPORT_TID): New constant, introduced by Linux commit
v4.20-rc1~75^2~2.
* NEWS: Mention this.
* tests/fanotify_init.c (main): Update expected output.

Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>

xlat: update siginfo_codes

* xlat/siginfo_codes.in (SI_LWP): Remove, as it is not present on Linux.
(SI_NOINFO): Define only on SPARC, provide fallback value.

loop: use XLAT_MACROS_ONLY instead of #stop

As the former allows controlling presence of xlat definitions
during the inclusion and not header generation.

* xlat/loop_cmds.in: Remove #stop.
* loop.c: Wrap "xlat/loop_cmds.h" inclusion in XLAT_MACROS_ONLY.
* tests/ioctl_loop.c: Likewise.

syslog: move constant definitions to xlat

* syslog.c (enum): Remove.
* xlat/syslog_action_type.in: Add fallback definitions.

Add copyright headers to some files that lack them

We do our best to keep copyright headers up to date, yet
git history provides better information on this subject
and is more accurate than copyright headers.

Update copyright headers

Update NEWS

strace.1.in: consistently use CTRL-combinations

strace.1.in: print names of entities in bold, provide man page sections

* strace.1.in (.SH DESCRIPTION, .SH OPTIONS): Add man page section
numbers.  Make mentions of strace and other entities bold.

strace.1.in: document %net

* strace.1.in: Mention %net as a synonym to %network.

Complements: v4.25-21-g97c3deca5 "basic_filters: add %net as a possible designation for network syscalls"

quotactl: add xlat styles support

* quota.c (print_qcmd): New function.
(SYS_FUNC(quotactl)): Use it to print the quotactl command.
* tests/quotactl.c (print_dqinfo, print_dqfmt): Handle XLAT_RAW
and XLAT_VERBOSE.
(QUOTA_STR, QUOTA_ID_STR, QUOTA_STR_INVALID): New macros.
(gen_quotacmd, gen_quotaid): New functions.
(main): Use them.
* tests/quotactl-Xabbrev.c: New file.
* tests/quotactl-Xraw.c: Likewise.
* tests/quotactl-Xverbose.c: Likewise.
* tests/gen_tests.in (quotactl-Xabbrev, quotactl-Xraw,
quotactl-Xverbose): New tests.
* tests/pure_executables.list: Add quotactl-Xabbrev, quotactl-Xraw,
and quotactl-Xverbose.
* tests/.gitignore: Likewise.

Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>

xlat_idx: do not issue warnings for holes in indices

Some xlat indices like evdev_abs have holes, avoid issuing warnings
about them.

* xlat.c (xlat_idx): Do not issue warnings for holes in the index.

rtnl_link: fix off-by-one errors in indexed and sorted xlat lookups

* rtnl_link.c (decode_nla_tun_type, decode_ifla_xdp_attached,
decode_ifla_inet_conf, decode_ifla_inet6_flags, decode_ifla_inet6_conf,
decode_ifla_inet6_stats, decode_ifla_inet6_icmp6_stats,
decode_ifla_inet6_agm): Decrement xlat size by one to account
for XLAT_END as other users of indexed and sorted xlats do.

Fixes: v4.25~71 "rtnl_link: decode named constants for IFLA_XDP_ATTACHED attribute value"
Fixes: v4.23~41 "rtnl_link: decode IFLA_AF_SPEC"
Fixes: v4.23~37 "rtnl_link: implement IFLA_INFO_DATA for tun devices"

net: fix off-by-one error in sorted xlat lookup

* net.c (ax25_protocols): Decrement xlat size by one to account
for XLAT_END as other users of sorted xlats do.

Fixes: v4.25~28 "net: add support for AX.25 protocols and socket option names decoding"

netlink_smc_diag: fix off-by-one error in xlat lookup

* netlink_smc_diag.c (decode_smc_diag_shutdown): Decrement xlat size
by one to account for XLAT_END as other users of xlats do.

Fixes: v4.25~54 "netlink_smc_diag: decode SMC_DIAG_SHUTDOWN attribute value"

aio: fix off-by-one error in indexed xlat lookup

* aio.c (tprint_lio_opcode): Decrement xlat size by one to account
for XLAT_END as other users of indexed xlats do.

Fixes: v4.24~71 "aio: print IOCB_CMD_* using xlat"

nlattr: fix off-by-one error in indexed xlat lookup

* nlattr.c (decode_nla_meminfo): Decrement xlat size by one
to account for XLAT_END as other users of indexed xlats do.

Fixes: v4.23~89 "nlattr: print index names in netlink meminfo array"