Refactor stack pointers

Change all linux/*/arch_regs.c to provide either ARCH_SP_REG
or ARCH_SP_PEEK_ADDR.  Introduce get_stack_pointer(), rewrite
all code accessing stack pointers to use get_stack_pointer().
On some architectures stack pointers were referred to as frame pointers,
clean up this confusion.

* defs.h (get_stack_pointer): New prototype.
* syscall.c (get_stack_pointer): New function.
* linux/arch_rt_sigframe.c: New file.
* linux/aarch64/arch_regs.c (aarch64_sp_ptr, arm_sp_ptr): Remove.
(ARCH_SP_REG): New macro.
* linux/alpha/arch_regs.c: Import linux/alpha/arch_regs.h.
(REG_FP): Rename to REG_SP.
(ARCH_SP_PEEK_ADDR): New macro.
* linux/alpha/arch_sigreturn.c (arch_sigreturn): Use get_stack_pointer.
* linux/arc/arch_regs.c (arc_sp_ptr): Remove.
(ARCH_SP_REG): New macro.
* linux/arm/arch_regs.c (arm_sp_ptr): Remove.
(ARCH_SP_REG): New macro.
* linux/arm/arch_sigreturn.c (arch_sigreturn): Use get_stack_pointer.
* linux/avr32/arch_regs.c (avr32_sp_ptr): Remove.
(ARCH_SP_REG): New macro.
* linux/bfin/arch_regs.c (ARCH_SP_PEEK_ADDR): New macro.
* linux/hppa/arch_regs.c: Import linux/hppa/arch_regs.h.
(PT_GR30, ARCH_SP_PEEK_ADDR): New macros.
* linux/hppa/arch_rt_sigframe.c (FUNC_GET_RT_SIGFRAME_ADDR): Use
get_stack_pointer.
* linux/i386/arch_regs.c (i386_esp_ptr): Remove.
(ARCH_SP_REG): New macro.
* linux/i386/arch_rt_sigframe.c (FUNC_GET_RT_SIGFRAME_ADDR): Use
get_stack_pointer.
* linux/i386/arch_sigreturn.c (arch_sigreturn): Likewise.
* linux/ia64/arch_regs.c (ia64_frame_ptr): Remove.
(ARCH_SP_REG): New macro.
* linux/ia64/arch_regs.h (ia64_frame_ptr): Remove.
* linux/ia64/arch_rt_sigframe.c (FUNC_GET_RT_SIGFRAME_ADDR): Use
get_stack_pointer.
* linux/m68k/arch_regs.c (m68k_usp_ptr): Remove.
(ARCH_SP_REG): New macro.
* linux/m68k/arch_rt_sigframe.c: Link to i386/arch_rt_sigframe.c.
* linux/m68k/arch_sigreturn.c (arch_sigreturn): Use get_stack_pointer.
* linux/metag/arch_regs.c (metag_sp_ptr): Remove.
(ARCH_SP_REG): New macro.
* linux/metag/arch_rt_sigframe.c (FUNC_GET_RT_SIGFRAME_ADDR): Use
get_stack_pointer.
* linux/microblaze/arch_regs.c (ARCH_SP_PEEK_ADDR): New macro.
* linux/mips/arch_regs.c: Import linux/mips/arch_regs.h.
(mips_regs): Add static qualifier.
(ARCH_SP_REG): New macro.
* linux/mips/arch_sigreturn.c (arch_sigreturn): Use get_stack_pointer.
* linux/nios2/arch_regs.c (nios2_sp_ptr): Remove.
(ARCH_SP_REG): New macro.
* linux/or1k/arch_regs.c (or1k_sp_ptr): Remove.
(ARCH_SP_REG): New macro.
* linux/powerpc/arch_regs.c (ppc_regs): Add static qualifier.
(ARCH_SP_REG): New macro.
* linux/powerpc/arch_rt_sigframe.c (FUNC_GET_RT_SIGFRAME_ADDR): Use
get_stack_pointer.
* linux/powerpc/arch_sigreturn.c (arch_sigreturn): Use get_stack_pointer.
* linux/powerpc64/arch_rt_sigframe.c (FUNC_GET_RT_SIGFRAME_ADDR): Use
get_stack_pointer.
* linux/riscv/arch_regs.c (riscv_sp_ptr): Remove.
(ARCH_SP_REG): New macro.
* linux/s390/arch_regs.c (s390_frame_ptr): Remove.
(ARCH_SP_REG): New macro.
* linux/s390/arch_sigreturn.c (S390_FRAME_PTR): Remove.
(arch_sigreturn): Use get_stack_pointer.
* linux/s390x/arch_regs.c (s390_frame_ptr, s390x_frame_ptr): Remove.
(ARCH_SP_REG): New macro.
* linux/s390x/arch_sigreturn.c (S390_FRAME_PTR): Remove.
* linux/sh/arch_regs.c (ARCH_SP_PEEK_ADDR): New macro.
* linux/sh64/arch_regs.c: Likewise.
* linux/sparc/arch_regs.c: Import linux/sparc/arch_regs.h.
(sparc_regs): Add static qualifier.
(ARCH_SP_REG): New macro.
* linux/sparc/arch_sigreturn.c (arch_sigreturn): Use get_stack_pointer.
* linux/sparc64/arch_rt_sigframe.c (FUNC_GET_RT_SIGFRAME_ADDR): Use
get_stack_pointer.
* linux/tile/arch_regs.c (tile_regs): Add static qualifier.
(ARCH_SP_REG): New macro.
* linux/tile/arch_sigreturn.c (arch_sigreturn): Use get_stack_pointer.
* linux/x86_64/arch_regs.c (i386_esp_ptr, x86_64_rsp_ptr): Remove.
(ARCH_SP_REG): New macro.
* linux/x86_64/arch_regs.h (i386_esp_ptr, x86_64_rsp_ptr): Remove.
* linux/x86_64/arch_rt_sigframe.c: Link to i386/arch_rt_sigframe.c.
* linux/xtensa/arch_regs.c (ARCH_SP_PEEK_ADDR): New macro.
* linux/aarch64/arch_regs.h: Remove.
* linux/aarch64/arch_rt_sigframe.c: Remove.
* linux/alpha/arch_regs.h: Remove.
* linux/alpha/arch_rt_sigframe.c: Remove.
* linux/arc/arch_regs.h: Remove.
* linux/arc/arch_rt_sigframe.c: Remove.
* linux/arm/arch_regs.h: Remove.
* linux/arm/arch_rt_sigframe.c: Remove.
* linux/avr32/arch_regs.h: Remove.
* linux/avr32/arch_rt_sigframe.c: Remove.
* linux/bfin/arch_rt_sigframe.c: Remove.
* linux/hppa/arch_regs.h: Remove.
* linux/i386/arch_regs.h: Remove.
* linux/m68k/arch_regs.h: Remove.
* linux/metag/arch_regs.h: Remove.
* linux/microblaze/arch_rt_sigframe.c: Remove.
* linux/mips/arch_regs.h: Remove.
* linux/mips/arch_rt_sigframe.c: Remove.
* linux/nios2/arch_regs.h: Remove.
* linux/nios2/arch_rt_sigframe.c: Remove.
* linux/or1k/arch_regs.h: Remove.
* linux/or1k/arch_rt_sigframe.c: Remove.
* linux/powerpc/arch_regs.h: Remove.
* linux/powerpc64/arch_regs.h: Remove.
* linux/riscv/arch_regs.h: Remove.
* linux/riscv/arch_rt_sigframe.c: Remove.
* linux/s390/arch_regs.h: Remove.
* linux/s390/arch_rt_sigframe.c: Remove.
* linux/s390x/arch_regs.h: Remove.
* linux/s390x/arch_rt_sigframe.c: Remove.
* linux/sh/arch_rt_sigframe.c: Remove.
* linux/sh64/arch_rt_sigframe.c: Remove.
* linux/sparc/arch_regs.h: Remove.
* linux/sparc/arch_rt_sigframe.c: Remove.
* linux/sparc64/arch_regs.h: Remove.
* linux/tile/arch_regs.h: Remove.
* linux/tile/arch_rt_sigframe.c: Remove.
* linux/xtensa/arch_rt_sigframe.c: Remove.
* Makefile.am (EXTRA_DIST): Remove them, add linux/arch_rt_sigframe.c.

Refactor print_pc()

Split print_pc() into arch-independent print_instruction_pointer()
and arch-specific get_instruction_pointer().

* print_instruction_pointer.c: New file.
* Makefile.am (strace_SOURCES): Add it.
* defs.h (print_pc): Remove.
(get_instruction_pointer, print_instruction_pointer): New prototypes.
* syscall.c (print_pc): Remove.
(get_instruction_pointer): New function.
* strace.c (printleader): Replace print_pc with
print_instruction_pointer.

ppc64: remove redundant redefinition

* linux/powerpc64/arch_regs.c (ARCH_PC_REG): Remove.

print_dev_t: print major and minor numbers in hex like stat(1)

* print_dev_t.c (print_dev_t): Print major and minor numbers in hex.
* strace.1.in: Update makedev example.
* tests/bpf-obj_get_info_by_fd.c (main): Update expected output.
* tests/btrfs.c (btrfs_print_balance_args, btrfs_test_scrub_ioctls,
btrfs_test_dev_info_ioctl, btrfs_test_get_dev_stats_ioctl,
btrfs_test_dev_replace_ioctl): Update expected output.
* tests/ioctl_dm.c (main): Likewise.
* tests/ioctl_loop.c (print_loop_info, print_loop_info64): Likewise.
* tests/mknod.c (main): Likewise.
* tests/mknodat.c (main): Likewise.
* tests/nlattr_unix_diag_msg.c (main): Likewise.
* tests/ustat.c (main): Likewise.
* tests/xstatx.c (print_stat): Likewise.

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

s390x: beautify sthyi data tail prints

The test already expects a ", " before the print of struct
padding. Let's add it to s390.c to make the output look a bit nicer and
fix test runs on z/VM that have padding at the end of the STHYI structs.

* s390.c (decode_ebcdic): Add missing comma.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>

Stop using SIG_0

Number 0 is not a valid signal number, and SIG_0 is not a valid
description for a signal.

* linux/signalent.h: Replace SIG_0 with 0.
* linux/alpha/signalent.h: Likewise.
* linux/hppa/signalent.h: Likewise.
* linux/mips/signalent.h: Likewise.
* linux/sparc/signalent.h: Likewise.
* filter_qualify.c (sigstr_to_uint): Start iterations with number 1.
* tests/fcntl-common.c (test_fcntl_others): Update expected output.
* tests/kill.c (main): Likewise.
* tests/ptrace.c (test_peeksiginfo): Likewise.
* tests/s390_runtime_instr.c (main): Likewise.

mem: fix build on architectures where kernel_ulong_t is bigger than long

* mem.c (print_mmap_flags): Fix format string.

Fixes: v4.25-26-g0933b3086 "mem: add xlat styles support to print_mmap_flags"

tests: add remap_file_pages test variants with different xlat verbosity levels

* tests/remap_file_pages-Xabbrev.c: New file.
* tests/remap_file_pages-Xraw.c: Likewise.
* tests/remap_file_pages-Xverbose.c: Likewise.
* tests/remap_file_pages.c: Add handling of XLAT_RAW and XLAT_VERBOSE flags.
* tests/pure_executables.list: Add remap_file_pages-Xabbrev,
remap_file_pages-Xraw, and remap_file_pages-Xverbose.
* tests/.gitignore: Likewise.
* tests/gen_tests.in (remap_file_pages-Xabbrev, remap_file_pages-Xraw,
remap_file_pages-Xverbose): New tests.

mem: add xlat styles support to print_mmap_flags

* mem.c (print_mmap_flags): Respect xlat_verbosity.
* tests/mmap.c (main): Update expected output.
* tests/old_mmap.c (main): Likewise.

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

tests: add memfd_create test variants with different xlat verbosity levels

* tests/memfd_create-Xabbrev.c: New file.
* tests/memfd_create-Xraw.c: Likewise.
* tests/memfd_create-Xverbose.c: Likewise.
* tests/memfd_create.c: Add handling of XLAT_RAW and XLAT_VERBOSE flags.
* tests/pure_executables.list: Add memfd_create-Xabbrev, memfd_create-Xraw,
and memfd_create-Xverbose.
* tests/.gitignore: Likewise.
* tests/gen_tests.in (memfd_create-Xabbrev, memfd_create-Xraw,
memfd_create-Xverbose): New tests.

memfd_create: add xlat styles support

* memfd_create.c (SYS_FUNC(memfd_create)): Respect xlat_verbosity.

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

Enhance error diagnostics when the first exec fails

When the first exec fails, strace used to print the trace of the child
process till its end, producing a lot of confusing output.
Enhance the diagnostics by hiding irrelevant parts of the trace.

* defs.h (TCB_CHECK_EXEC_SYSCALL): New macro.  Change values of TCB_*
macros listed after TCB_CHECK_EXEC_SYSCALL.
(check_exec_syscall): New macro.
* strace.c (dispatch_event) <TE_STOP_BEFORE_EXECVE>: Clear
TCB_CHECK_EXEC_SYSCALL flag.
* syscall.c (syscall_entering_trace): Do not clear TCB_HIDE_LOG when
TCB_CHECK_EXEC_SYSCALL is set, set TCB_CHECK_EXEC_SYSCALL along with
clearing TCB_HIDE_LOG.
(syscall_exiting_decode): Set TCB_HIDE_LOG if TCB_CHECK_EXEC_SYSCALL
is set.
* tests/first_exec_failure.test: New file.
* tests/Makefile.am (MISC_TESTS): Add first_exec_failure.test.

Closes: https://github.com/strace/strace/issues/88

build: use more traditional git options

The support of --no-patch alias to -s option in "git diff" and related
git commands was added in git v1.8.4.

* copyright-year-gen: Use "git show -s" instead of "git show --no-patch".
* file-date-gen: Use "git log -s" instead of "git log --no-patch".

Closes: https://github.com/strace/strace/issues/80

basic_filters: add %net as a possible designation for network syscalls

* basic_filters.c (lookup_class) <syscall_class>: Add %net as an alias
for TRACE_NETWORK.

hppa: add a comment about old name of syscall number 102

Also, remove empty definition.

* linux/hppa/syscallent.h ([102]): Remove empty definition,
add a comment that it was socketcall.

mips: update syscall entry for reserved221 syscall

The syscall number 4221 is actually called "reserved221" on mips.

* linux/mips/syscallent-o32.h ([4221]): Set to "reserved221".

arm: add a comment that __ARM_NR_cmpxchg was removed in 4.4

* linux/arm/syscallent.h: Add a comment about __ARM_NR_cmpxchg.

arm: replace empty syscall entry definitions with comments

* linux/arm/syscallent.h ([222]): Remove definition, add a comment
that it was tux syscall.
([223]): Remove definition, add comment that it was unused.
([254]): Remove definition, add comment that it was reserved
for set_thread_area.
([255]): Remove definition, add comment that it was reserved
for get_thread_area.

linux/dummy.h: remove unused sys_phys definition

* linux/dummy.h (sys_phys): Remove.

numa: use already existing array item printing function

* numa.c (print_int): Remove.
(SYS_FUNC(move_pages)): Use print_int32_array_member instead of
print_int.

net: use already existing array item printing function

* net.c (print_uint32): Remove.
(print_getsockopt): Use print_uint32_array_member instead of
print_uint32.

Remove HAVE_LINUX_GENETLINK_H ifdefs

<linux/netlink.h> is available since Linux 2.6.15 (commit
v2.6.15-rc1~53^2).

* configure.ac (AC_CHECK_HEADERS): Remove linux/genetlink.h.
* socketutils.c [!HAVE_LINUX_GENETLINK_H]: Remove.
* tests/netlink_generic.c [!HAVE_LINUX_GENETLINK_H]: Likewise.

Document -X option in strace -h output

* strace.c (usage): Mention -X option.

Reported-by: Dmitry Vyukov <dvyukov@google.com>
Complements: v4.23~308 "Add user interface for configuring xlat output style"

Move kill_save_errno to a separate header file

This function is going to be used outside strace.c,
so make it globally available and move it to a separate header file.

* strace.c (kill_save_errno): Add "inline" keyword, change return type
from "void" to "int", move the function ...
* kill_save_errno.h: ... to this new file.
* Makefile.am (strace_SOURCES): Add it.

syscall_entering_trace: set TCB_FILTERED along with TCB_HIDE_LOG

This allows to remove some of hide_log() checks that became redundant.

* syscall.c (syscall_entering_trace): Set TCB_FILTERED along with
TCB_HIDE_LOG, remove now redundant hide_log(tcp) check.
(syscall_exiting_decode): Replace "filtered(tcp) || hide_log(tcp)"
with "filtered(tcp)".

syscall_entering_trace: optimize clearing of TCB_HIDE_LOG flag

* syscall.c (syscall_entering_trace): Since we check for TCB_HIDE_LOG
flag anyway, do not clean it unless it is set.

print_inet_addr: print nameless and named addresses using the same style

* sockaddr.c (print_inet_addr): Handle var_name == NULL case in a more
structured way: use inet_addr("%s") form to print AF_INET addresses
in structureless contexts where no structure field name is available.
Likewise, use inet_pton(AF_INET6, "%s") that case.
* tests/nlattr_ifaddrmsg.c (main): Update expected output.
* tests/nlattr_ifla_af_spec.c (main): Likewise.

Complements: v4.19~76 "print_inet_addr: add support of invocations without field name"

tests: extend test coverage of RND* ioctl commands

* tests/ioctl_random.c (main): Check the error path of RNDADDENTROPY
parser.  Check decoding of unrecognized RND* ioctl commands.

Add support for /dev/[u]random ioctls

* random_ioctl.c: New file.
* Makefile.am (strace_SOURCES): Add it.
* defs.h (DECL_IOCTL): Add random.
* ioctl.c (ioctl_decode): Add 'R' case.
* xlat/random_ioctl_cmds.in: New file.
* tests/ioctl_random.c: New file.
* tests/.gitignore: Add ioctl_random.
* tests/pure_executables.list: Likewise.
* tests/gen_tests.in (ioctl_random): New entry.

Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>

Add dist/INSTALL

* dist/INSTALL: New file.
* bootstrap: Copy it.
* .gitignore: Add /INSTALL.

References: https://github.com/strace/strace/issues/17
References: https://github.com/strace/strace/issues/55
Closes: https://github.com/strace/strace/issues/67

Rename INSTALL to README-configure

* INSTALL-git.md: Replace INSTALL with README-configure.
* maint/install.texi: Likewise.
* INSTALL: Rename to README-configure, regenerate.
* Makefile.am (EXTRA_DIST): Add README-configure.

References: https://github.com/strace/strace/issues/85
Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>

dist/README: add more references

* dist/README: Mention README-hacking, add links to repositories
and the mailing list archive.

Suggested-by: Jamal Hadi Salim <jhs@mojatatu.com>
Co-Authored-by: Dmitry V. Levin <ldv@altlinux.org>

README.md: add a link to the new contributors guide

* README.md: Add a link to the Guide of new contributors.

Suggested-by: Jamal Hadi Salim <jhs@mojatatu.com>

Post-release administrivia

* NEWS: Add a header line for the next release.
* debian/changelog.in: Add a changelog entry for 4.25-1.
* strace.spec.in: Likewise.

Prepare for 4.25 release

* NEWS: Update for 4.25 release.

Update copyright headers

Headers updated automatically using maint/update_copyright_years.sh
script.

Update NEWS

Implement decoding of NBD_* ioctl commands

* nbd_ioctl.c: New file.
* Makefile.am (strace_SOURCES): Add it.
* defs.h (DECL_IOCTL): Add nbd.
* ioctl.c (ioctl_decode): Add 0xab (nbd) case.
* xlat/nbd_ioctl_cmds.in: Likewise.
* xlat/nbd_ioctl_flags.in: Likewise.
* tests/ioctl_nbd.c: Likewise.
* tests/.gitignore: Add ioctl_nbd.
* tests/pure_executables.list: Likewise.
* tests/gen_tests.in (ioctl_nbd): New entry.

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

tests: fix build with recent kernel headers

Linux commit v4.19-rc2-5-g2ecefa0a15fd0ef88b9cd5d15ceb813008136431
changed the definition of struct keyctl_dh_params in an incompatible
way again.  Workaround this issue by using designated initializers.

* tests/keyctl.c (main): Use designated initializers for
struct keyctl_dh_params.

arm, sparc, sparc64: wire up io_pgetevents

* linux/arm/syscallent.h ([399]): Wire up io_pgetevents syscall
introduced by Linux commit v4.19-rc7~24^2~1.
(ARM_FIRST_SHUFFLED_SYSCALL, SYS_socket_subcall): Raise from 400 to 500,
to make room for new syscalls.
* linux/sparc/syscallent.h ([361]): Wire up io_pgetevents syscall
introduced by Linux commit v4.19~31^2~5.
* linux/sparc64/syscallent.h: Likewise.

Update ioctl entries from linux v4.19

* linux/32/ioctls_inc_align16.h: Update from linux v4.19-rc8
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/i386/ioctls_arch0.h: Likewise.
* linux/x86_64/ioctls_arch0.h: Likewise.
* NEWS: Mention this.

maint: update for linux 4.19-rc8

* maint/ioctls_sym.sh (x86_list): Add KVM_[GS]ET_NESTED_STATE.

Remove redundant VIDIOC_SUBDEV_* constants

Remove those of VIDIOC_SUBDEV_* constants are defined exactly the same
way by the Linux kernel as their VIDIOC_* origins.

Linux kernel commit v4.19-rc1~137^2~248 introduced more of such
duplicates, forward remove them as well.

* linux/32/ioctls_inc_align16.h: Remove VIDIOC_SUBDEV_DV_TIMINGS_CAP,
VIDIOC_SUBDEV_ENUM_DV_TIMINGS, VIDIOC_SUBDEV_G_DV_TIMINGS,
VIDIOC_SUBDEV_G_EDID, VIDIOC_SUBDEV_QUERY_DV_TIMINGS,
VIDIOC_SUBDEV_S_DV_TIMINGS, and VIDIOC_SUBDEV_S_EDID.
* 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.
* maint/ioctls_sym.sh: Remove VIDIOC_SUBDEV_DV_TIMINGS_CAP,
VIDIOC_SUBDEV_ENUM_DV_TIMINGS, VIDIOC_SUBDEV_ENUMSTD,
VIDIOC_SUBDEV_G_DV_TIMINGS, VIDIOC_SUBDEV_G_EDID, VIDIOC_SUBDEV_G_STD,
VIDIOC_SUBDEV_QUERY_DV_TIMINGS, VIDIOC_SUBDEV_QUERYSTD,
VIDIOC_SUBDEV_S_DV_TIMINGS, VIDIOC_SUBDEV_S_EDID, and
VIDIOC_SUBDEV_S_STD.

xtensa: fix typo in pkey_alloc syscall number

* linux/xtensa/syscallent.h (pkey_alloc): Change from 249 to 349.

xlat: print _IOC_NONE in symbolic form even if it is equal to 0

On some architectures _IOC_NONE equals to 1, on others it is 0.
Change the way how ioctl direction flags are printed so that
_IOC_NONE is printed in symbolic form even if it is equal to 0.

* xlat/ioctl_dirs.in (_IOC_NONE): Move to the head of the list.
* tests/ioctl_inotify.c (main): Update expected output.
* tests/ioctl_loop. (main): Likewise.c
* tests/ioctl_perf.c (main): Likewise.
* tests/ioctl_scsi.c (main): Likewise.

Disable git-archive

Since configure uses git-version-gen which in turn depends
on "git describe" or  a .tarball-version file, raw archives
generated by "git archive" cannot be built.

* .gitattributes: New file.
* README-github_gitlab-autogenerated-archives.txt: Likewise.

Workaround signedness bugs in system NLMSG_OK reported by -Wsign-compare

Introduce a replacement for NLMSG_OK provided by <linux/netlink.h> since
that system macro contains signedness bugs that are not going to be fixed.

* netlink.h: Include <stdbool.h>.
(is_nlmsg_ok): New static inline function.
* socketutils.c (receive_responses): Use it instead of NLMSG_OK.
* tests/netlink_inet_diag.c (check_responses): Likewise.
* tests/netlink_netlink_diag.c (check_responses): Likewise.
* tests/netlink_unix_diag.c (check_responses): Likewise.

Closes: https://github.com/strace/strace/issues/79

tests/sprintrc.c: drop redundant check

* tests/sprintrc.c (sprintrc_ex): Remove fmt check, this also fixes the
warning reported by clang -Wtautological-constant-out-of-range-compare.

build: enable gcc -Woverride-init and clang -Winitializer-overrides

* m4/st_warn_cflags.m4 (gl_WARN_ADD): Add -Winitializer-overrides
and -Woverride-init.

tests: exclude arm_sync_file_range from ksysent test

arm_sync_file_range is better known as sync_file_range2.

* tests/ksysent.sed: Filter out arm_sync_file_range.

Ignore warnings about overridden initialization of hwaddr_sizes

As hwaddr_sizes array is explicitly initialized this way,
ignore potential warnings reported by gcc -Woverride-init
and clang -Winitializer-overrides.

* gcc_compat.h (CLANG_PREREQ): New macro.
(DIAG_PUSH_IGNORE_OVERRIDE_INIT, DIAG_POP_IGNORE_OVERRIDE_INIT): New
macros non-trivially defined for gcc >= 4.2 and clang >= 2.8.
* sock.c (print_ifreq): Use them to ignore warnings about overridden
initialization of hwaddr_sizes array.

Closes: https://github.com/strace/strace/issues/77

tests: workaround clang -Wunneeded-internal-declaration bug

* tests/execve.c (main): Explicitly mark q_envp variable as used
to workaround clang -Wunneeded-internal-declaration bug.
* tests/execveat.c (main): Likewise.
* tests/nsyscalls.c (main): Explicitly mark syscallent variable as used
to workaround clang -Wunneeded-internal-declaration bug.

Closes: https://github.com/strace/strace/issues/78

process: honor xlat style in print_user_offset_addr

* process.c (print_user_offset_addr): Print in accordance with xlat
verbosity setting.

time: add xlat styles support to printclockname

* time.c (printclockname): Respectl xlat_verbosity.

perf: rewrite print_perf_event_attr using PRINT_FIELD_* macros

* perf.c: Include "print_fields.h".
(PRINT_XLAT): Remove.
(print_perf_event_attr): Use PRINT_FIELD_* macros.

tests: check stack unwinding for signals

* tests/stack-fcall-3.c: Include <signal.h>.
(f3): Call getpid or kill depending on the argument, store getpid result.
* tests/stack-fcall.c (main): Remove arguments, call f0(0) and f0(1).
* tests/strace-k-demangle.expected: Update expected output.
* tests/strace-k.expected: Likewise.
* tests/strace-k.test: Rewrite pattern matching code.

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

Print stack traces on signals

I don't know why it hasn't been done earlier.

* strace.c (print_stopped) [ENABLE_STACKTRACE]: Call unwind_tcb_print
if stack trace printing is enabled.

xlat: provide fallback definitions for open_access_modes constants

* xlat/open_access_modes.in: Add fallback values.

xlat: update resources

* xlat/resources.in: Declare as #value indexed, provide fallback values.
(RLIMIT_VMEM): Remove.

nlattr: ignore nla_type flags when selecting nlattr decoder

* nlattr.c (decode_nlattr_with_data): Apply NLA_TYPE_MASK to nla_type
before decoder selection.

netlink_packet_diag: assorted decoding fixes

* xlat/af_packet_versions.in: New file.
* netlink_packet_diag.c: Include "xlat/af_packet_versions.h".
(decode_packet_diag_req): sdiag_protocol shouldn't be decoded as a protocol,
currently it should be set to 0.
(decode_packet_diag_info): Decode pdi_version field using af_packet_versions
xlat; decode pdi_index field as an interface index.
(packet_diag_msg_nla_decoders) <PACKET_DIAG_UID>: Decode using
decode_nla_uid.
(decode_packet_diag_msg): Decode pdiag_num as an low-level protocol.
* tests/netlink_sock_diag.c: Update expected output.
* tests/nlattr_packet_diag_msg.c: Likewise.

sockaddr: add X.25 socket address decoding support

* sockaddr.c: Include <linux/x25.h>.
(print_sockaddr_data_x25): New function.
(sa_printers) <[AF_X25]>: New socket address handler.
* tests/net-sockaddr.c (check_x25): New function.
(main): Use it to check X.25 socket address decoding.

net: add support for AX.25 protocols and socket option names decoding

* xlat/ax25_protocols.in: New file.
* xlat/sock_ax25_options.in: Likewise.
* net.c: Include "xlat/ax25_protocols.h" and "xlat/sock_ax25_options.h".
* (SYS_FUNC(socket)): <[AF_AX25]>: Print protocol name using
ax25_protocols xlat.
(print_sockopt_fd_level_name) <[SOL_AX25]>: Print socket option name
using sock_ax25_options xlat.

sockaddr: decode AX.25 socket addresses

* defs.h (print_ax25_addr): New prototype.
* print_fields.h (PRINT_FIELD_AX25_ADDR): New macro.
* sockaddr.c: Include <linux/ax25.h>.
(check_ax25_address, ax25_addr2str, print_ax25_addr_raw,
print_ax25_addr, print_sockaddr_data_ax25): New functions.
(sa_printers) <[AF_AX25]>: New printer.
* tests/net-sockaddr.c (AX25_ADDR): New macro.
(check_ax25): New function.
(main): Use it to check AX.25 socket address decoding.

macros: add ROUNDUP macro

* macros.h (ROUNDUP): New macro.

futex: recognise FUTEX_BITSET_MATCH_ANY bitmask

* xlat/futexbitset.in: New file.
* futex.c: Include "xlat/futexbitset.h".
(futex) <FUTEX_WAIT_BITSET, FUTEX_WAKE_BITSET>: Decode val3 using
futexbitset xlat.
* tests/futex.c: Add checks for 0xffffffff bitset mask printing.

Closes: Linux commit v4.16-rc1~166^2^2~2

ioprio: move constant definitions to xlat

* xlat/ioprio_class.in: Add fallback values.
* xlat/ioprio_who.in: Likewise.
* ioprio.c: Remove IOPRIO_WHO_* and IOPRIO_CLASS_* enums.

net: decode AF_PACKET protocols in socket syscall

* net.c: Include "xlat/ethernet_protocols.h" in XLAT_MACROS_ONLY mode.
(SYS_FUNC(socket)) <AF_PACKET>: Decode using ethernet_protocols xlat.

print_ifindex: add public get_ifname method

In order to be able to obtain sanitised device name internally.

* defs.h (get_ifname): New declaration.
* print_ifindex.c (get_ifname): Refactor, leaving out addition
of if_nametoindex("") part.
(sprint_ifname): New function, adds if_nametoindex("")
to get_ifname's output.
(print_ifindex): Use sprint_ifname instead of get_ifname.

socketutils: introduce get_family_by_proto

Add a helper function that returns address family based on the internal
notion of the socket protocol using protocols table.

* defs.h (get_family_by_proto): New declaration.
* socketutils.c (get_family_by_proto): New function.

socketutils: add more IP/IPv6 transport protocols

* defs.h (sock_proto): Add SOCK_PROTO_UDPLITE, SOCK_PROTO_DCCP,
SOCK_PROTO_SCTP, SOCK_PROTO_L2TP_IP, SOCK_PROTO_PING, SOCK_PROTO_RAW,
SOCK_PROTO_UDPLITEv6, SOCK_PROTO_DCCPv6, SOCK_PROTO_L2TP_IPv6,
SOCK_PROTO_SCTPv6, SOCK_PROTO_PINGv6, and SOCK_PROTO_RAWv6.
* socketutils.c: Include "xlat/inet_protocols.h" in XLAT_MACROS_ONLY
mode.
(protocols): Add protocol descriptions for them.

socketutils: store more information in protocols table

This also allows getting rid of all these *_v[46]_get calls.

* socketutils.c (unix_get, inet_get, netlink_gen): Add family, protocol,
and proto_name paramteres, use them where appropriate.
(tcp_v4_get, udp_v4_get, tcp_v6_get, udp_v6_get): Remove.
(protocols): Add family and proto fields to the structure, call inet_get
for IP/IPv6 protocols.
(get_sockaddr_by_inode_uncached): Update protocols->get calls.

sockaddr: whitespace cleanup, fix typo in comment

* sockaddr.c (print_sockaddr_data_bt): Fix typo, remove excess
indentation from the switch statement.

tests: add utimensat test variants with different xlat verbosity levels

* tests/utimensat-Xabbrev.c: New file.
* tests/utimensat-Xraw.c: Likewise.
* tests/utimensat-Xverbose.c: Likewise.
* tests/utimensat.c: Add handling of XLAT_RAW and XLAT_VERBOSE flags.
* tests/pure_executables.list: Add utimensat-Xabbrev, utimensat-Xraw,
and utimensat-Xverbose.
* tests/.gitignore: Likewise.
* tests/gen_tests.in (utimensat-Xabbrev, utimensat-Xraw, utimensat-Xverbose): New
tests.

print_timespec: make print_timespec_t_utime respect xlat style setting

* print_timespec.c (print_timespec_t_utime): Print raw timespec value
in accordance with xlat style setting.

netlink: honor custom xlat style setting during nlmsg flags printing

Commit v4.23~343 introduced xlat style argument to printflags_ex, but
XLAT_STYLE_DEFAULT was introduced only in the next commit v4.23~342,
which led to missing out fixing the sole external user of this
peculiar extended interface.

* netlink.c (decode_nlmsg_flags): Use XLAT_STYLE_DEFAULT instead of
XLAT_STYLE_ABBREV in printflags_ex call.

Fixes: v4.23~342 "Introduce XLAT_STYLE_DEFAULT"

netlink_netfilter: use xlat styles for res_id workaround printing

* netlink_netfilter.c (decode_netlink_netfilter): Call print_xlat_ex
in order to respect xlat style setting.

xlat: provide fallback definitions for epollevents

* xlat/epollevents.in: Provide fallback definitions, add EPOLLNVAL
constant (introduced by Linux commit v4.16-rc1~3^2~3).

xlat: provide fallback definitions to pollflags

* xlat/pollflags.in: Add fallback definitions for POLLWRNORM,
POLLWRBAND, POLLMSG, POLLREMOVE, and POLLRDHUP.

xlat: provide fallback values for socktypes

* xlat/socktypes.in: Provide fallback values.

xlat: provide fallback values to route_nexthop_flags

* xlat/route_nexthop_flags.in: Add fallback values.

block: move fallback definitions for ioctl commands to xlat

* xlat/block_ioctl_cmds.in: New file.
* block.c: Include "xlat/block_ioctl_cmds.h" in XLAT_MACROS_ONLY mode.
(BLKPG, BLKTRACESETUP, BLKTRACESTART, BLKTRACESTOP, BLKTRACETEARDOWN,
BLKDISCARD, BLKIOMIN, BLKIOOPT, BLKALIGNOFF, BLKPBSZGET,
BLKDISCARDZEROES, BLKSECDISCARD, BLKROTATIONAL, BLKZEROOUT): Remove
fallback definitions as those are porvided by block_ioctl_cmds xlat now.

Decode BLKGETSIZE64 unconditionally

It is available on all supported kernel versions.

* block.c (block_ioctl): Remove #ifdef HAVE_BLKGETSIZE64.
* configure.ac: Remove BLKGETSIZE64 check.

xlat: add ability to specify a default string to print_xlat_ex

In order to avoid dealing with xlat verbosity styles outside xlat code
as much as possible.

* defs.h (xlat_style_private_flag_bits): Rename from
print_array_flag_bits, add PXF_DEFAULT_STR_BIT.
(xlat_style_private_flags): Rename from print_array_flags, add
FLAG_(PXF_DEFAULT_STR).
* xlat.c (print_xlat_ex): Handle PXF_DEFAULT_STR by interpreting str
as a default value (print both value and str in XLAT_STYLE_ABBREV).

nlattr: provide common AF_INET{,6} address decoders

Rename decode_ifla_inet6_token to decode_nla_in6_addr,
add a sister function decode_nla_in_addr for future use.

* nlattr.c (decode_nla_in_addr, decode_nla_in6_addr): New functions.
* nlattr.h (DECL_NLA(in_addr), DECL_NLA(in6_addr)): New declarations.
* rtnl_link.c (decode_ifla_inet6_token): Remove.
(ifla_inet6_nla_decoders) <[IFLA_INET6_TOKEN]>: Use decode_nla_in6_addr.

net: decode SOL_XDP socket option names

* xlat/sock_xdp_options.in: New file.
* net.c: Include "xlat/sock_xdp_options.h".
(print_sockopt_fd_level_name) <case SOL_XDP>: Print SOL_XDP socket
option names.

xlat: add SOL_XDP to socketlayers.in

* xlat/socketlayers.in (SOL_XDP): New constant, introduced by Linux
commit v4.18-rc1~114^2~304^2~4^2~14.

xlat: add AF_XDP to addrfams.in

* xlat/addrfams.in (AF_XDP): New constant, introduced by Linux commit
v4.18-rc1~114^2~304^2~4^2~14.

netlink_smc_diag: decode SMC_DIAG_SHUTDOWN attribute value

* xlat/sock_shutdown_flags.in: New file.
* netlink_smc_diag.c: Include "xlat/sock_shutdown_flags.h".
(decode_smc_diag_shutdown): New function.
(smc_diag_msg_nla_decoders) <[SMC_DIAG_SHUTDOWN]>: Use
decode_smc_diag_shutdown.
* tests/nlattr_smc_diag_msg.c: Add checks for SMC_DIAG_SHUTDOWN.

tests/ioctl_v4l2: do not calculate page end address each time

* tests/ioctl_v4l2.c (main): Replace page + size with page_end.

print_fields: simplify UINT64_MAX printing

As we have print_xlat_u now.

* print_fields.h (PRINT_FIELD_U64): Use print_xlat_u for UINT64_MAX
printing.

nsfs: simplify auxstr logic

There's no need to check whether non-NULL value is being assigned to
auxstr; syscall_exiting_trace does it itself.

* nsfs.c (nsfs_ioctl) <case NS_GET_NSTYPE>: Simply assign result of
xlookup to auxstr if syserror(tcp) is false.

xlat: add BPF_PROG_TYPE_SK_REUSEPORT to bpf_prog_types.in

* xlat/bpf_prog_types.in (BPF_PROG_TYPE_SK_REUSEPORT): New constant,
introduced by Linux commit v4.19-rc1~140^2~24^2~2^2~5.
* tests/bpf.c: Update expected output.

xlat: add IPSTATS_MIB_REASM_OVERLAPS to snmp_ip_stats_mib.in

* xlat/snmp_ip_stats.in (IPSTATS_MIB_REASM_OVERLAPS): New constant,
introduced by Linux commit v4.19-rc1~140^2~128^2~2.

xlat: update bpf_map_types.in

* xlat/bpf_map_types.in (BPF_MAP_TYPE_CGROUP_STORAGE): New constant,
introduced by Linux commit v4.19-rc1~140^2~108^2~3^2~12.
(BPF_MAP_TYPE_REUSEPORT_SOCKARRAY): New constant, introduced by Linux
commit v4.19-rc1~140^2~24^2~2^2~6.
* tests/bpf.c: Update expected output.

rtnl_link: add IFLA_MIN_MTU and IFLA_MAX_MTU attributes

Introduced by Linux commit v4.19-rc1~140^2~205^2~1.

* rtnl_link.c (ifinfomsg_nla_decoders) <[IFLA_MIN_MTU], [IFLA_MAX_MTU]>:
New decoder, calls decode_nla_u32.
* xlat/rtnl_link_attrs.in (IFLA_MIN_MTU, IFLA_MAX_MTU): New constant.

xlat: add IPV4_DEVCONF_BC_FORWARDING-1 to inet_devconf_indices.in

* xlat/inet_devconf_indices.in (IPV4_DEVCONF_BC_FORWARDING-1): New
constant, introduced by Linux commit v4.19-rc1~140^2~208^2~1.

rtnl_netconf: add NETCONFA_BC_FORWARDING attribute

Introduced by Linux commit v4.19-rc1~140^2~208^2~1.

* rtnl_netconf.c (netconfmsg_nla_decoders) <[NETCONFA_BC_FORWARDING]>:
New decoder, calls decode_nla_s32.
* xlat/rtnl_netconf_attrs.in (NETCONFA_BC_FORWARDING): New constant.

netlink_smc_diag: add SMC_DIAG_FALLBACK attribute support

Introduced by Linux commit v4.19-rc1~140^2~253^2~1.

* linux/smc_diag.h (SMC_DIAG_FALLBACK): New enumeration item.
(struct smc_diag_fallback): New type definition.
* netlink_smc_diag.c: Include "xlat/smc_decl_codes.h".
(decode_smc_diag_fallback): New function.
(smc_diag_msg_nla_decoders) <[SMC_DIAG_FALLBACK]>: New decoder, calls
decode_smc_diag_fallback.
* tests/nlattr_smc_diag_msg.c: Add checks for SMC_DIAG_FALLBACK
attribute decoding.
* xlat/smc_decl_codes.in: New file.
* xlat/smc_diag_attrs.in (SMC_DIAG_FALLBACK): New constant.

defs.h: add style argument to printxval_search_ex macro

It is identical to printxval_search otherwise.

* defs.h (printxval_search_ex): Add style argument.