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2023-08-06powerpc: fix conflicting definitions with newer Linux kernelWaldemar Brodkorb
2023-08-02add missing wchar.h, fixes a compile error with openadkWaldemar Brodkorb
2023-07-14[PATCH] libc/sysdeps/linux/common/bits/wchar.h: resync with glibc, fix build ↵Waldemar Brodkorb
issue with gcc 12 The current definition of __WCHAR_MIN and __WCHAR_MAX are only correct when wchar_t is an int. This is not the case on ARM/AArch64 where wchar_t is an unsigned int, or some other architectures where wchar_t is a long. The current incorrect definition causes a build issue for example when building mpd, which uses boost, with gcc 12.x: In file included from /home/thomas/buildroot/aarch64/host/aarch64-buildroot-linux-uclibc/sysroot/usr/include/boost/integer.hpp:20, from /home/thomas/buildroot/aarch64/host/aarch64-buildroot-linux-uclibc/sysroot/usr/include/boost/crc.hpp:42, from ../src/storage/StorageState.cxx:43: /home/thomas/buildroot/aarch64/host/aarch64-buildroot-linux-uclibc/sysroot/usr/include/boost/integer_traits.hpp:105:69: error: narrowing conversion of ‘-2147483648’ from ‘int’ to ‘wchar_t’ [-Wnarrowing] 105 | public detail::integer_traits_base<wchar_t, WCHAR_MIN, WCHAR_MAX> | ^ This issue was fixed in glibc in 2013, see bug report https://sourceware.org/bugzilla/show_bug.cgi?id=15036, and upstream commit https://sourceware.org/git/?p=glibc.git;a=commit;h=052aff95782fefe9c63566471063e8b20836bfb8. Since the i386-specific definition of __WCHAR_MIN and __WCHAR_MAX was also removed at the same time in glibc, we do the same as part of this commit. Reported-by: Clément Ramirez <clement.ramirez@bootlin.com> With-some-useful-help-from: Paul Kocialkowski <paul.kocialkowski@bootlin.com> Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
2023-05-10gettimeofday: fix static buildWaldemar Brodkorb
2023-03-13Emulate 'futimesat' when __NR_futimesat is not available.Elliot Thomas
2023-02-03riscv64: fix linking with binutils 2.40Waldemar Brodkorb
See here for details: https://sourceware.org/bugzilla/show_bug.cgi?id=28509
2023-01-22Defined MAP_FIXED_NOREPLACElinted
Added definition for MAP_FIXED_NOREPLACE which was added in kernel 4.17 Signed-off-by: linted <linted@users.noreply.github.com>
2022-12-19gettimeofday() vdso supportramin
2022-12-19sycall macro for vdso supportramin
2022-11-20RISC-V 32-bit supportustcymgu@gmail.com
Added 32-bit RISC-V support. I have managed to get 32-bit RISC-V No-MMU Linux running based on mainstream buildroot. It's nice to have uclibc support this 32-bit No-MMU target. There's no substantial code change except definations and config options. Signed-off-by: Yimin Gu <ustcymgu@gmail.com>
2022-10-14Static pie support for ppclinted
Modified config files and crt1.S to support static pie elf generation. Signed-off-by: linted <linted@users.noreply.github.com>
2022-10-14arc: add optimized string functions for ARCv3Pavel Kozlov
Add ability to use optimized versions of string functions for ARCv3 32-bit CPUs with UCLIBC_HAS_STRING_ARCH_OPT option. Add optimized memcpy/memset/memcmp code for ARCv3 CPUs based on the code from newlib and adapt for ARCv3 existed optimized strchr/strcmp/strcpy/strlen. Link to the Synopsys newlib repo with code for ARCv3 on GitHub: https://github.com/foss-for-synopsys-dwc-arc-processors/newlib Signed-off-by: Pavel Kozlov <pavel.kozlov@synopsys.com>
2022-09-27arc: add support for ARCv3 32-bit processorsSergey Matyukevich
New ARCv3 ISA includes both 64-bit and 32-bit CPU family. This patch adds support for 32-bit ARCv3 HS5x processors. Signed-off-by: Sergey Matyukevich <sergey.matyukevich@synopsys.com> Signed-off-by: Pavel Kozlov <pavel.kozlov@synopsys.com>
2022-09-27arc: add asm macrosSergey Matyukevich
Add a header file with assembler macros to be able to handle in one place the differences between ARCv2 and ARCv3 ISAs. It is a preparatory step before the introduction of support for ARCv3 CPUs. Signed-off-by: Sergey Matyukevich <sergey.matyukevich@synopsys.com> Signed-off-by: Pavel Kozlov <pavel.kozlov@synopsys.com>
2022-09-21xtensa: add static pie supportMax Filippov
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2022-09-07Added support for creation of Static Position-Independent Executables (PIE) ↵linted
on mips Updated config to allow compilation of rcrt1.o for mips and modified it's crt1.S to perform relocates in __start. The mips architecture performs relocations differently then most other architectures. reloc_static_pie was rewritten, taking code from dl-startup.c, in order to perfrom the additional relocations. Modifications were made to mips' dl-startup.h to allow for the use of contained macros without including _start definition. Signed-off-by: linted <linted@users.noreply.github.com>
2022-08-08Added support for creation of Static Position-Independent Executables (PIE) ↵linted
on aarch64 Updated config to allow compilation of rcrt1.o for aarch64 and modified it's crt1.S to relocate dynamic section prior to __uClibc_main. Disabled stack protector when compiling reloc_static_pie.c to avoid TLS access prior to it being setup. Signed-off-by: linted <linted@users.noreply.github.com>
2022-08-08resource.h: add missing RUSAGE_THREADWaldemar Brodkorb
There is a real-world usage of RUSAGE_THREAD by the pistache project, https://github.com/oktal/pistache. Reported-By: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
2022-07-26Added support for creation of Static Position-Independent Executables (PIE) ↵linted
on i386, x86_64, and arm. This patch adds the generation of rcrt1.o which is used by gcc when compiling with the --static-pie flag. rcrt1.o differs from crt1.o and Scrt1.o in that it the executable has a dynamic section but no relocations have been performed prior to _start being called. crt1.o assumes there to be no dynamic relocations, and Scrt1.o has all relocations performed prior to execution by lsdo. The new reloc_static_pie function handles parsing the dynamic section, and performing the relocations in a architecture agnostic method. It also sets _dl_load_base which is used when initalizing TLS to ensure loading from the proper location. This allows for easier porting of static-pie support to additional architectures as only modifications to crt1.S to find the load address are required. Signed-off-by: linted <linted@users.noreply.github.com>
2022-06-20xtensa: implement user context manipulation functionsMax Filippov
Implement getcontext, makecontext, setcontext and swapcontext. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2022-05-20define RLIMIT_RTTIME, bump RLIMIT_NLIMITSRomain Naour
This macro exists since Linux 2.6.25 [1] and is defined in glibc since 2.14 [2] for sparc and most supported architectures. RLIMIT_RTTIME has been added later for mips [3] and alpha [4]. For example, RLIMIT_RTTIME is needed to build qemu 7.0.0 with Linux user-land emulation support [5]. [1] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=78f2c7db6068fd6ef75b8c120f04a388848eacb5 [2] https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=67f86a251e0d36107fe28999281d46e76941c7b9 [3] https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=8969f4df1a526aa60dd0bc1c4736cf02104d4a05 [4] https://sourceware.org/git/?p=glibc.git;a=commitdiff;h=53c2cb7641bd866398156625ef672bbd2d78a0d8 [5] https://git.qemu.org/?p=qemu.git;a=commitdiff;h=244fd08323088db73590ff2317dfe86f810b51d7 Signed-off-by: Romain Naour <romain.naour@gmail.com>
2022-02-27guard prlimit, reported by Lance FredricksonWaldemar Brodkorb
2022-01-28sched.h: Add SCHED_DEADLINEPetr Vorel
Defined in kernel v3.14, commit aab03e05e8f7 ("sched/deadline: Add SCHED_DEADLINE structures & implementation") Signed-off-by: Petr Vorel <petr.vorel@gmail.com>
2022-01-21add prlimit syscall wrapper, now for realWaldemar Brodkorb
2022-01-21add prlimit syscall wrapperWaldemar Brodkorb
2022-01-21nds32: sync with binutils 2.37, gcc 11.2 and linux 5.10.93 changesWaldemar Brodkorb
2022-01-10arc: fix signal handler restorerSergey Matyukevich
When MD_FALLBACK_FRAME_STATE_FOR handler in libgcc unwind code checks the second instruction opcode in __default_rt_sa_restorer function, it expects to see the following values for ARC cores: - 0x7ee0781e for ARCv2 LE - 0x003f226f for ARC700 LE ARC700 value correspond to trap0 instruction. ARCv2 value corresponds to the following code: traps_0 j_s [blink] However, unlike glibc, uClibc implementation of __default_rt_sa_restorer for ARC does not have that jump. Hence libgcc unwind code is not able to recognize signal frame correctly on ARCv2 and completes too early. This change fixes libgcc unwinding over signal frame on ARCv2 adding missing jump to __default_rt_sa_restorer. Signed-off-by: Sergey Matyukevich <sergey.matyukevich@synopsys.com>
2021-12-24Fix some warnings due to type issuesYann Sionneau
Fixes those two warnings: In file included from <command-line>: libc/sysdeps/linux/common/openat64.c:18:33: warning: 'openat64' alias between functions of incompatible types 'int(int, const char *, int, ...)' and 'int(int, const char *, int, mode_t)' {aka 'int(int, const char *, int, unsigned int)'} [-Wattribute-alias=] 18 | strong_alias_untyped(__openat64,openat64) | ^~~~~~~~ ./include/libc-symbols.h:177:31: note: in definition of macro '_strong_alias_untyped' 177 | extern __typeof (aliasname) aliasname __attribute__ ((alias (#name))) __attribute_copy__ (name); | ^~~~~~~~~ libc/sysdeps/linux/common/openat64.c:18:1: note: in expansion of macro 'strong_alias_untyped' 18 | strong_alias_untyped(__openat64,openat64) | ^~~~~~~~~~~~~~~~~~~~ libc/sysdeps/linux/common/openat64.c:14:12: note: aliased declaration here 14 | static int __openat64(int fd, const char *file, int oflag, mode_t mode) | ^~~~~~~~~~ and CC libc/sysdeps/linux/common/stat.os libc/sysdeps/linux/common/stat.c: In function 'stat': libc/sysdeps/linux/common/stat.c:28:40: warning: passing argument 3 of 'fstatat64' from incompatible pointer type [-Wincompatible-pointer-types] 28 | return fstatat64(AT_FDCWD, file_name, buf, 0); | ^~~ | | | struct stat * In file included from libc/sysdeps/linux/common/stat.c:11: ./include/sys/stat.h:258:35: note: expected 'struct stat64 * restrict' but argument is of type 'struct stat *' 258 | struct stat64 *__restrict __buf, int __flag) | ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~ Signed-off-by: Yann Sionneau <ysionneau@kalray.eu>
2021-12-24kvx: fix warning about __BITS_PER_LONG not being definedYann Sionneau
Signed-off-by: Yann Sionneau <ysionneau@kalray.eu>
2021-06-04powerpc: fix PIE/PIC builds with newer gcc/binutils which use secureplt by ↵Yann Sionneau
default This patch fixes segfault of all user space processes (including init, which caused a panic) on recent buildroot powerpc32 builds. The issue has been reported by Romain Naour in this thread: https://mailman.uclibc-ng.org/pipermail/devel/2021-May/002068.html Recent buildroot toolchain enables secure PLT in powerpc gcc. The latter will then supply -msecure-plt to gas invocations by default. Recent buildroot also enables PIE by defaults. For the secure PLT to work in PIC, the r30 register needs to point to the GOT. Old "bss plt" was just a one-instruction-wide PLT slot, pointed-to by a R_PPC_JMP_SLOT relocation, which was written on-the-fly to contain a branch instruction to the correct address. It therefore had to stay writable. New secure PLT only contains read-only code which loads the branch address from the writable GOT. Note: secure PLT without PIC does not need r30 to be set. Because offset between plt stub code and got is known at link-time. In this case the PLT entry looks like: 1009b3e0 <__uClibc_main@plt>: 1009b3e0: 3d 60 10 0e lis r11,4110 1009b3e4: 81 6b 03 74 lwz r11,884(r11) 1009b3e8: 7d 69 03 a6 mtctr r11 1009b3ec: 4e 80 04 20 bctr Whereas secure PLT with PIC - offset between plt and got is unknown at link-time - looks like this: 000af800 <00000000.plt_pic32.__uClibc_main>: af800: 81 7e 03 80 lwz r11,896(r30) af804: 7d 69 03 a6 mtctr r11 af808: 4e 80 04 20 bctr af80c: 60 00 00 00 nop Signed-off-by: Yann Sionneau <yann@sionneau.net>
2021-04-09open: Add support for O_TMPFILENicolas Cavallari
Since Linux 3.11, O_TMPFILE allows to create unnamed files that can be linked later on. It is internally defined as (O_TMPFILE | O_DIRECTORY) to make it fail on old kernels. Copying definitions from glibc for O_TMPFILE is not enough to support O_TMPFILE; The open() wrapper also need to pass the mode when the flag contains O_TMPFILE, otherwise, it will pass mode 000 which will succeed but yield unexpected results. openat() is curiously not affected since it passes the mode unconditionally.. Signed-off-by: Nicolas Cavallari <nicolas.cavallari@green-communications.fr>
2021-02-19fcntl.h: Make F_DUPFD_CLOEXEC if _USE_XOPEN2K8Paul Cercueil
The F_DUPFD_CLOEXEC flag was added in POSIX 2008.09. Signed-off-by: Paul Cercueil <paul@crapouillou.net>
2021-01-28use renameat2 syscall, when renameat isn't availableWaldemar Brodkorb
2021-01-27fix umount2 compilation for alpha on Linux 5.xWaldemar Brodkorb
2021-01-27sh: Add 64-bit time types from kernelGeoffrey Le Gourriérec
Building uclibc 1.0.37 for SuperH architecture with linux-headers 5.10.7 fails at libpthread level due to missing time-related data structures, usually defined by the kernel. Define those missing data structures in SuperH-specific kernel_types.h. Context: building for sh4eb-r2d[1] and sh4-r2d[1] boards emulations for QEMU using the buildroot image generation tool. Regarding the issue, a patch[3] was already issued in the kernel some time ago, which aimed to solve precisely this problem. After coming up with a quick and dirty patch for buildroot modifying Linux headers[4], some discussion was sparked on the subject with Linux folks[5]. Some analyzing later, conclusion was that: 1) Previously mentioned patch[4] was fixing the symptom, not the ill 2) SuperH-specific code in uclibc could be patched instead, to solve the problem for other use cases (e.g. building just a toolchain) [1] https://git.buildroot.net/buildroot/tree/configs/qemu_sh4eb_r2d_defconfig?h=2020.02.9 [2] https://git.buildroot.net/buildroot/tree/configs/qemu_sh4_r2d_defconfig?h=2020.02.9 [3] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fc94cf2092c7c1267fa2deb8388d624f50eba808 [4] https://git.buildroot.net/buildroot/commit/?id=742f37de8d0e3797698411dfc6a63bd7e98aafe2 [5] https://patchwork.kernel.org/project/linux-sh/patch/20210123165652.10884-1-geoffrey.legourrierec@gmail.com/ Signed-off-by: Geoffrey Le Gourriérec <geoffrey.legourrierec@gmail.com>
2020-10-02kvx: add support for kvx arch to uClibc-ngYann Sionneau
This commit adds support for Kalray VLIW family (kvx) Kalray kv3 core is embedded in Kalray Coolidge SoC. This core which is the third of the KV family has the following features: 32/64 bits execution mode 6-issue VLIW architecture 64 x 64bits general purpose registers SIMD instructions little-endian In order to build a usable toolchain, build scripts are provided at the following address: https://github.com/kalray/build-scripts. Kalray uses FOSS which is available at https://github.com/kalray This includes Linux kernel, uClibc-ng, gcc, binutils, etc. Signed-off-by: Clément Léger <cleger@kalray.eu> Signed-off-by: Guillaume Thouvenin <gthouvenin@kalray.eu> Signed-off-by: Laurent Thevenoux <lthevenoux@kalray.eu> Signed-off-by: Marc Poulhies <mpoulhies@kalray.eu> Signed-off-by: Marius Gligor <mgligor@kalray.eu> Signed-off-by: Yann Sionneau <ysionneau@kalray.eu>
2020-09-15Fix memory corruption due to struct stat fieldYann Sionneau
Kernel stat/stat64 structure and uClibc-ng ones were not in sync regarding the timespec fields. Kernel had them but uClibc did not expose it in some cases. Man page says that stat struct should have timespec fields if: * _POSIX_C_SOURCE is defined to 200809L or greater or * _XOPEN_SOURCE is defined to 700 or greater or * _BSD_SOURCE is defined or * _SVID_SOURCE is defined In the case of buildroot vim build, neither _BSD_SOURCE nor _SVID_SOURCE were defined. Only _POSIX_C_SOURCE and _XOPEN_SOURCE were defined. uClibc-ng header only checked for _BSD_SOURCE and _SVID_SOURCE via __USE_MISC. This patch adds a check to __USE_XOPEN2K8 which is defined if _POSIX_C_SOURCE >= 200809L or _XOPEN_SOURCE >= 700 This for instance fixes a crash at startup of vim (not the busybox one) on aarch64 and all other arch where in kernel STAT_HAVE_NSEC is set and where stat.h in uClibc-ng comes from libc/sysdeps/linux/common-generic/bits Signed-off-by: Yann Sionneau <ysionneau@kalray.eu>
2020-08-19Add {name, open}_to_handle_at() implementationPetr Vorel
copied from musl 1.2.1. Signed-off-by: Petr Vorel <petr.vorel@gmail.com>
2020-08-17riscv64: add __riscv_flush_icacheWaldemar Brodkorb
Always use the systemcall as uClibc-ng has no vdso support. Tested with libffi and python in qemu-system-riscv64.
2020-08-15sys/random.h include stddef.hWaldemar Brodkorb
Reported-By: akater <nuclearspace@gmail.com>
2020-08-11xtensa: add exclusive access supportMax Filippov
Add XCHAL definitions for S32C1I and EXCLUSIVE options to xtensa-config.h, include it in places that implement atomic operations and add implementations with exclusive access option opcodes. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2020-08-11xtensa: relax memory constraint in atomic assemblyMax Filippov
Replace "a" constraints with "+m" to avoid forcing atomic variable address into a register and let the compiler use non-zero offset in load/store opcodes. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
2020-07-02Rename __unused struct members to include a namespaceEd Wildgoose
Rename various spare fields in structs to include a namespace This should avoid accidental clashes with uses of the __unused symbol in upstream projects. eg currently it causes a compile error in dhcpcd 8.x due to their re-use of the __unused symbol as a macro This follows the style of glibc which does something equivalent
2020-05-17mips: Do not include hi and lo in __SYSCALL_CLOBBERS for R6Romain Naour
From [1] "GCC 10 (PR 91233) won't silently allow registers that are not architecturally available to be present in the clobber list anymore, resulting in build failure for mips*r6 targets in form of: ... .../sysdep.h:146:2: error: the register ‘lo’ cannot be clobbered in ‘asm’ for the current target 146 | __asm__ volatile ( \ | ^~~~~~~ This is because base R6 ISA doesn't define hi and lo registers w/o DSP extension. This patch provides the alternative definitions of __SYSCALL_CLOBBERS for r6 targets that won't include those registers." [1] https://sourceware.org/git/?p=glibc.git;a=commit;h=020b2a97bb15f807c0482f0faee2184ed05bcad8 Signed-off-by: Romain Naour <romain.naour@gmail.com> Cc: Waldemar Brodkorb <wbx@openadk.org>
2020-04-01statx: make include conditional, fixes non-csky arch buildroot buildsWaldemar Brodkorb
2020-02-07aarch64/bits: provide sigstack.hVladimir Murzin
It fixes tst-signal6 and friends. Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
2020-02-07aarch64/sys: update ucontext.hVladimir Murzin
It fixes tst-cancel1 and friends. Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
2020-02-07common/bits: Fix ipc_perm and semid_ds definitions for 64-bit archesVladimir Murzin
It fixes: FAIL sem got 1 expected 0 failed: incorrect sem_nsems! semget(IPC_CREAT) = 0 semctl(k) = 0 sem_nsems = 0 for aarch64. Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
2020-02-03csky: add statx conditionalsWaldemar Brodkorb
Similar to glibc commit https://sourceware.org/git/?p=glibc.git;a=commit;h=6bbfc5c09fc5b5e3d4a0cddbbd4e2e457767dae7 we need to handle Linux kernel change, which removed stat64 family from default syscall set. Signed-off-by: Waldemar Brodkorb <wbx@openadk.org> Signed-off-by: Waldemar Brodkorb <wbrodkorb@conet.de>
2020-01-30poll: avoid calling select with empty sets which hangs the processYann Sionneau
Avoid calling select with empty sets which hangs the process This makes uClibc-ng act like glibc and musl Without this fix the test_poll of python3 testsuite hangs forever Scenario of the issue: If you call poll with only invalid file descriptors, like in python3 testsuite (https://github.com/python/cpython/blob/master/Lib/test/test_poll.py#L83) You will go through uClibc poll emulation code, which is based on select syscall. Your first call to select will fail, it will return -1 and errno will be set to EBADF: https://github.com/wbx-github/uclibc-ng/blob/master/libc/sysdeps/linux/common/poll.c#L120 Then you will go through the for loop which tests individually each file descriptor by calling select on each one: https://github.com/wbx-github/uclibc-ng/blob/master/libc/sysdeps/linux/common/poll.c#L163 each call will also return -1 with errno being equal to EBADF. Therefore all pollfd will have the POLLNVAL flag in their respective revents field. And, the most important, rset/wset/xset will stay empty. Then the for loop ends, the "continue" makes the while loop run again. The following select() is run again: https://github.com/wbx-github/uclibc-ng/blob/master/libc/sysdeps/linux/common/poll.c#L120 But this time the sets are empty. If the poll was called with timeout set to -1, this select will hang forever because there is no timeout and the sets are empty so no event will ever wake it up. test program: int main(void) { struct pollfd pfd; int ret; int pipe_fds[2]; pipe(pipe_fds); close(pipe_fds[0]); close(pipe_fds[1]); pfd.fd = pipe_fds[0]; pfd.events = POLLIN | POLLOUT | POLLPRI; pfd.revents = 0; ret = poll(&pfd, 1, -1); printf("ret: %d\n", ret); if (ret < 0) printf("error: %s", strerror(errno)); else { puts("revents: "); if (pfd.revents & POLLERR) printf(" POLLERR"); if (pfd.revents & POLLHUP) printf(" POLLHUP"); if (pfd.revents & POLLNVAL) printf(" POLLNVAL"); puts(""); } return 0; } This hangs on uClibc-ng aarch64 and Kalray's arch (kv3) but does the following on musl and glibc: " ret: 1 revents: POLLNVAL " strace output of this program with uClibc *without* the patch applied: pselect6(4, [3], [3], [3], NULL, NULL) = -1 EBADF (Bad file descriptor) pselect6(4, [3], [3], [3], {tv_sec=0, tv_nsec=0}, NULL) = -1 EBADF (Bad file descriptor) pselect6(0, 0x7ffffffb80, 0x7ffffffb68, 0x7ffffffb50, NULL, NULL (never finishes) strace output of this program with uClibc *with* the patch applied: pselect6(4, [3], [3], [3], NULL, NULL) = -1 EBADF (Bad file descriptor) pselect6(4, [3], [3], [3], {tv_sec=0, tv_nsec=0}, NULL) = -1 EBADF (Bad file descriptor) write(1, "ret: 1\n", 7ret: 1 ) = 7 write(1, "revents: \n", 10revents: ) = 10 write(1, " POLLNVAL\n", 10 POLLNVAL ) = 10 exit_group(0) = ? +++ exited with 0 +++