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2021-06-28posix: Add _Fork [BZ #4737]Adhemerval Zanella
Austin Group issue 62 [1] dropped the async-signal-safe requirement for fork and provided a async-signal-safe _Fork replacement that does not run the atfork handlers. It will be included in the next POSIX standard. It allow to close a long standing issue to make fork AS-safe (BZ#4737). As indicated on the bug, besides the internal lock for the atfork handlers itself; there is no guarantee that the handlers itself will not introduce more AS-safe issues. The idea is synchronize fork with the required internal locks to allow children in multithread processes to use mostly of standard function (even though POSIX states only AS-safe function should be used). On signal handles, _Fork should be used intead and only AS-safe functions should be used. For testing, the new tst-_Fork only check basic usage. I also added a new tst-mallocfork3 which uses the same strategy to check for deadlock of tst-mallocfork2 but using threads instead of subprocesses (and it does deadlock if it replaces _Fork with fork). [1] https://austingroupbugs.net/view.php?id=62
2021-06-28arm: align stack in clone [BZ 28020]Szabolcs Nagy
The arm PCS requires 8 byte aligned stack at function entry. Previously unaligned stack could crash the clone child. Fixes bug 28020.
2021-06-28Linux: Cleanups after librt moveFlorian Weimer
librt.so is no longer installed for PTHREAD_IN_LIBC, and tests are not linked against it. $(librt) is introduced globally for shared tests that need to be linked for both PTHREAD_IN_LIBC and !PTHREAD_IN_LIBC. GLIBC_PRIVATE symbols that were needed during the transition are removed again. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
2021-06-28Linux: Move timer_settime, __timer_settime64 from librt to libcFlorian Weimer
The symbols were moved using scripts/move-symbol-to-libc.py. The way the ABI intransition is implemented is changed with this commit: the implementation is now consolidated in one file with a TIMER_T_WAS_INT_COMPAT check. The shared librt is now empty, so this commit adds a placeholder symbol at the base version, GLIBC_2.2, and potentially at the GLIBC_2.3.3 version as well (the leftover from the int/timer_t ABI transition). Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-06-28Linux: Move timer_gettime, __timer_gettime64 from librt to libcFlorian Weimer
The symbols were moved using scripts/move-symbol-to-libc.py. The way the ABI intransition is implemented is changed with this commit: the implementation is now consolidated in one file with a TIMER_T_WAS_INT_COMPAT check. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-06-28Linux: Move timer_getoverrun from librt to libcFlorian Weimer
The symbol was moved using scripts/move-symbol-to-libc.py. The way the ABI intransition is implemented is changed with this commit: the implementation is now consolidated in one file with a TIMER_T_WAS_INT_COMPAT check. Reviewed-by: Adhemerva Zanella <adhemerval.zanella@linaro.org>
2021-06-28Linux: Move timer_create, timer_delete from librt to libcFlorian Weimer
The symbols were moved using scripts/move-symbol-to-libc.py. timer_create and timer_delete are tied together via the int/timer_t compatibility code. The way the ABI intransition is implemented is changed with this commit: the implementation is now consolidated in one file with a TIMER_T_WAS_INT_COMPAT check. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-06-28Linux: Define TIMER_T_WAS_INT_COMPAT in kernel-posix-timers.hFlorian Weimer
This is almost equivalent to __WORDSIZE == 64 && OTHER_SHLIB_COMPAT (librt, GLIBC_2_1, GLIBC_2_3_3), except that this expression is true for mips64/n64 targets as well, even though those did not undergo the timer_t transition. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
2021-06-25Linux: Move timer helper routines from librt to libcFlorian Weimer
This adds several temporary GLIBC_PRIVATE exports. The symbol names are changed so that they all start with __timer_. It is now possible to invoke the fork handler directly, so pthread_atfork is no longer necessary. The associated error cannot happen anymore, and cancellation handling can be removed from the helper thread routine. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-06-25Linux: Move mq_unlink from librt to libcFlorian Weimer
The symbol was moved using scripts/move-symbol-to-libc.py. A placeholder symbol is needed on some architectures for the GLIBC_2.3.4 version. Reviewed-by: Adhemerva Zanella <adhemerval.zanella@linaro.org>
2021-06-25Linux: Move mq_send, mq_timedsend, __mq_timedsend_time64 to libcFlorian Weimer
The symbols were moved using scripts/move-symbol-to-libc.py. Reviewed-by: Adhemerva Zanella <adhemerval.zanella@linaro.org>
2021-06-25Linux: Move mq_receive, mq_timedreceive, __mq_timedreceive_time64 to libcFlorian Weimer
The symbols were moved using scripts/move-symbol-to-libc.py. Reviewed-by: Adhemerva Zanella <adhemerval.zanella@linaro.org>
2021-06-25Linux: Move mq_open, __mq_open_2 from librt to libcFlorian Weimer
The symbols were moved using scripts/move-symbol-to-libc.py. A placeholder symbol is required to keep the GLIBC_2.7 version. Reviewed-by: Adhemerva Zanella <adhemerval.zanella@linaro.org>
2021-06-25Linux: Move mq_notify from librt to libcFlorian Weimer
The symbol was moved using scripts/move-symbol-to-libc.py. An explicit call from fork into the mq_notify implementation replaces the previous use of pthread_atfork. Reviewed-by: Adhemerva Zanella <adhemerval.zanella@linaro.org>
2021-06-25Linux: Move mq_getattr from librt to libcFlorian Weimer
The symbol was moved using scripts/move-symbol-to-libc.py. Reviewed-by: Adhemerva Zanella <adhemerval.zanella@linaro.org>
2021-06-25Linux: Move mq_setattr from librt to libcFlorian Weimer
The symbol was moved using scripts/move-symbol-to-libc.py. To introduce the proper symbol versioning, the implementation of the system call wrapper us moved to a C file. Reviewed-by: Adhemerva Zanella <adhemerval.zanella@linaro.org>
2021-06-25Linux: Move mq_close from librt to libcFlorian Weimer
The symbol was moved using scripts/move-symbol-to-libc.py. Reviewed-by: Adhemerva Zanella <adhemerval.zanella@linaro.org>
2021-06-25Linux: Move lio_listio, lio_listio64 from librt to libcFlorian Weimer
The symbols were moved using scripts/move-symbol-to-libc.py. Placeholder symbols are needed on some architectures, to keep the GLIBC_2.1 and GLIBC_2.4 symbol versions around. Reviewed-by: Adhemerva Zanella <adhemerval.zanella@linaro.org>
2021-06-25rt: Rework lio_listio implementationFlorian Weimer
Move the common code into rt/lio_listio-common.c and include the file in both rt/lio_listio.c and rt/lio_listio64.c. The common code automatically defines both public symbols for __WORDSIZE == 64. Reviewed-by: Adhemerva Zanella <adhemerval.zanella@linaro.org>
2021-06-25Linux: Move aio_write, aio_write64 into libcFlorian Weimer
Both symbols have to be moved at the same time because they are intertwined for __WORDSIZE == 64. The treatment of this case is also changed to match more closely how the other files suppress the declaration of the *64 identifier. The symbols were moved using scripts/move-symbol-to-libc.py. Reviewed-by: Adhemerva Zanella <adhemerval.zanella@linaro.org>
2021-06-25Linux: Move aio_suspend, aio_suspend64, __aio_suspend_time64 to libcFlorian Weimer
The symbols were moved using scripts/move-symbol-to-libc.py. There is a minor oddity here: This is generic code shared with Hurd, and Hurd does not have time64 support. This is why the versioned_symbol export for __aio_suspend_time64 is restricted to the PTHREAD_IN_LIBC code. Reviewed-by: Adhemerva Zanella <adhemerval.zanella@linaro.org>
2021-06-25Linux: Move aio_return, aio_return64 into libcFlorian Weimer
The symbols were moved using scripts/move-symbol-to-libc.py. Reviewed-by: Adhemerva Zanella <adhemerval.zanella@linaro.org>
2021-06-25Linux: Move aio_read, aio_read64 into libcFlorian Weimer
Both symbols have to be moved at the same time because they are intertwined for __WORDSIZE == 64. The treatment of this case is also changed to match more closely how the other files suppress the declaration of the *64 identifier. The symbols were moved using scripts/move-symbol-to-libc.py. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-06-25Linux: Move aio_fsync, aio_fsync64 into libcFlorian Weimer
The symbols were moved using scripts/move-symbol-to-libc.py. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-06-25Linux: Move aio_error, aio_error64 into libcFlorian Weimer
The symbols were moved using scripts/move-symbol-to-libc.py. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-06-25Linux: Move aio_cancel, aio_cancel64 into libcFlorian Weimer
The symbols were moved using scripts/move-symbol-to-libc.py. A version placeholder symbol is needed on alpha and sparc because of the additional symbols formerly at version GLIBC_2.3. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>:
2021-06-25Linux: Move aio_init from librt into libcFlorian Weimer
This commit also moves the aio_misc and aio_sigquue helper, so GLIBC_PRIVATE exports need to be added. The symbol was moved using scripts/move-symbol-to-libc.py. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-06-24posix: Consolidate fork implementationAdhemerval Zanella
The Linux nptl implementation is used as base for generic fork implementation to handle the internal locks and mutexes. The system specific bits are moved a new internal _Fork symbol. (This new implementation will be used to provide a async-signal-safe _Fork now that POSIX has clarified that fork might not be async-signal-safe [1]). For Hurd it means that the __nss_database_fork_prepare_parent and __nss_database_fork_subprocess will be run in a slight different order. [1] https://austingroupbugs.net/view.php?id=62
2021-06-22linux: Only use 64-bit syscall if required for clock_nanosleepAdhemerval Zanella
For !__ASSUME_TIME64_SYSCALLS there is no need to issue a 64-bit syscall if the provided timeout fits in a 32-bit one. The 64-bit usage should be rare since the timeout is a relative one. Checked on i686-linux-gnu on a 4.15 kernel and on a 5.11 kernel (with and without --enable-kernel=5.1) and on x86_64-linux-gnu. Reviewed-by: Lukasz Majewski <lukma@denx.de>
2021-06-22linux: Only use 64-bit syscall if required for utimensat familyAdhemerval Zanella
For !__ASSUME_TIME64_SYSCALLS there is no need to issue a 64-bit syscall if the provided timeout fits in a 32-bit one. The 64-bit usage should be rare since the timeout is a relative one. The large timeout are already tests by io/tst-utimensat-skeleton.c. Checked on i686-linux-gnu on a 4.15 kernel and on a 5.11 kernel (with and without --enable-kernel=5.1) and on x86_64-linux-gnu. Reviewed-by: Lukasz Majewski <lukma@denx.de>
2021-06-22linux: Only use 64-bit syscall if required for sigtimedwaitAdhemerval Zanella
For !__ASSUME_TIME64_SYSCALLS there is no need to issue a 64-bit syscall if the provided timeout fits in a 32-bit one. The 64-bit usage should be rare since the timeout is a relative one. Checked on i686-linux-gnu on a 4.15 kernel and on a 5.11 kernel (with and without --enable-kernel=5.1) and on x86_64-linux-gnu. Reviewed-by: Lukasz Majewski <lukma@denx.de>
2021-06-22linux: Only use 64-bit syscall if required for mq_timedsendAdhemerval Zanella
For !__ASSUME_TIME64_SYSCALLS there is no need to issue a 64-bit syscall if the provided timeout fits in a 32-bit one. The 64-bit usage should be rare since the timeout is a relative one. Checked on i686-linux-gnu on a 4.15 kernel and on a 5.11 kernel (with and without --enable-kernel=5.1) and on x86_64-linux-gnu. Reviewed-by: Lukasz Majewski <lukma@denx.de>
2021-06-22linux: Only use 64-bit syscall if required for mq_timedreceiveAdhemerval Zanella
For !__ASSUME_TIME64_SYSCALLS there is no need to issue a 64-bit syscall if the provided timeout fits in a 32-bit one. The 64-bit usage should be rare since the timeout is a relative one. Checked on i686-linux-gnu on a 4.15 kernel and on a 5.11 kernel (with and without --enable-kernel=5.1) and on x86_64-linux-gnu. Reviewed-by: Lukasz Majewski <lukma@denx.de>
2021-06-22linux: Only use 64-bit syscall if required for timerfd_settimeAdhemerval Zanella
For !__ASSUME_TIME64_SYSCALLS there is no need to issue a 64-bit syscall if the provided timeout fits in a 32-bit one. The 64-bit usage should be rare since the timeout is a relative one. Checked on i686-linux-gnu on a 4.15 kernel and on a 5.11 kernel (with and without --enable-kernel=5.1) and on x86_64-linux-gnu. Reviewed-by: Lukasz Majewski <lukma@denx.de>
2021-06-22linux: Only use 64-bit syscall if required for semtimedopAdhemerval Zanella
For !__ASSUME_TIME64_SYSCALLS there is no need to issue a 64-bit syscall if the provided timeout fits in a 32-bit one. The 64-bit usage should be rare since the timeout is a relative one. Checked on i686-linux-gnu on a 4.15 kernel and on a 5.11 kernel (with and without --enable-kernel=5.1) and on x86_64-linux-gnu. Reviewed-by: Lukasz Majewski <lukma@denx.de>
2021-06-22linux: timerfd_gettime minor cleanupAdhemerval Zanella
The __NR_timerfd_gettime64 is always defined. Reviewed-by: Lukasz Majewski <lukma@denx.de>
2021-06-22linux: Remove time64-supportAdhemerval Zanella
It breaks the usage case of live migration like CRIU or similar and most usages can be optimized away by either building glibc with a minimum 5.1 kernel or by using the 32-bit syscall for the common case. Checked on i686-linux-gnu on a 4.15 kernel and on a 5.11 kernel (with and without --enable-kernel=5.1) and on x86_64-linux-gnu. Reviewed-by: Lukasz Majewski <lukma@denx.de>
2021-06-22linux: Remove supports_time64 () from clock_gettimeAdhemerval Zanella
It breaks the usage case of live migration like CRIU or similar. The performance drawback is it would require an extra syscall on older kernels without 64-bit time support. Checked on i686-linux-gnu on a 4.15 kernel and on a 5.11 kernel (with and without --enable-kernel=5.1) and on x86_64-linux-gnu. Reviewed-by: Lukasz Majewski <lukma@denx.de>
2021-06-22linux: Remove supports_time64 () from clock_getresAdhemerval Zanella
It breaks the usage case of live migration like CRIU or similar. The performance drawback is it would require an extra syscall on older kernels without 64-bit time support. Checked on i686-linux-gnu on a 4.15 kernel and on a 5.11 kernel (with and without --enable-kernel=5.1) and on x86_64-linux-gnu. Reviewed-by: Lukasz Majewski <lukma@denx.de>
2021-06-22linux: Only use 64-bit syscall if required for selectAdhemerval Zanella
For !__ASSUME_TIME64_SYSCALLS there is no need to issue a 64-bit syscall if the provided timeout fits in a 32-bit one. The 64-bit usage should be rare since the timeout is a relative one. This also avoids the need to use supports_time64() (which breaks the usage case of live migration like CRIU or similar). It also fixes an issue on 32-bit select call for !__ASSUME_PSELECT (microblase with older kernels only) where the expected timeout is a 'struct timeval' instead of 'struct timespec'. Checked on i686-linux-gnu on a 4.15 kernel and on a 5.11 kernel (with and without --enable-kernel=5.1) and on x86_64-linux-gnu. Reviewed-by: Lukasz Majewski <lukma@denx.de>
2021-06-22linux: Only use 64-bit syscall if required for pselectAdhemerval Zanella
For !__ASSUME_TIME64_SYSCALLS there is no need to issue a 64-bit syscall if the provided timeout fits in a 32-bit one. The 64-bit usage should be rare since the timeout is a relative one. This also avoids the need to use supports_time64() (which breaks the usage case of live migration like CRIU or similar). Checked on i686-linux-gnu on a 4.15 kernel and on a 5.11 kernel (with and without --enable-kernel=5.1) and on x86_64-linux-gnu. Reviewed-by: Lukasz Majewski <lukma@denx.de>
2021-06-22linux: Only use 64-bit syscall if required for ppollAdhemerval Zanella
For !__ASSUME_TIME64_SYSCALLS there is no need to issue a 64-bit syscall if the provided timeout fits in a 32-bit one. The 64-bit usage should be rare since the timeout is a relative one. This also avoids the need to use supports_time64() (which breaks the usage case of live migration like CRIU or similar). Checked on i686-linux-gnu on a 4.15 kernel and on a 5.11 kernel (with and without --enable-kernel=5.1) and on x86_64-linux-gnu. Reviewed-by: Lukasz Majewski <lukma@denx.de>
2021-06-22Use 64 bit time_t stat internallyAdhemerval Zanella
For the legacy ABI with supports 32-bit time_t it calls the 64-bit time directly, since the LFS symbols calls the 64-bit time_t ones internally. Checked on i686-linux-gnu and x86_64-linux-gnu. Reviewed-by: Lukasz Majewski <lukma@denx.de>
2021-06-22Add hidden prototypes for fsync, fdatasyncFlorian Weimer
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-06-22nptl: Move pthreadP.h into sysdeps directoryFlorian Weimer
This mirrors the situation on Hurd. These directories are on the include search part, so #include <pthreadP.h> works after this change on both Hurd and nptl. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-06-22rt: Move generic implementation from sysdeps/pthread to rtFlorian Weimer
The pthread-based implementation is the generic one. Replacing the stubs makes it clear that they do not have to be adjusted for the libpthread move. Result of: git mv -f sysdeps/pthread/aio_misc.h sysdeps/generic/ git mv sysdeps/pthread/timer_routines.c sysdeps/htl/ git mv -f sysdeps/pthread/{aio,lio,timer}_*.c rt/ Followed by manual adjustment of the #include paths in sysdeps/unix/sysv/linux/wordsize-64, and a move of the version definitions formerly in sysdeps/pthread/Versions. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-06-21rt: Move shm_unlink into libcFlorian Weimer
This function has no dependency on libpthread, so the move is also applied to Hurd. The symbol was moved using scripts/move-symbol-to-libc.py. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-06-21rt: Move shm_open into libcFlorian Weimer
This function has no dependency on libpthread, so the move is also applied to Hurd. To avoid localplt failures, use __open64_nocancel instead of pthread_setcancelstate and open. The symbol was moved using scripts/move-symbol-to-libc.py. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
2021-06-15nptl: Export _pthread_cleanup_push, _pthread_cleanup_pop againFlorian Weimer
These were turned into compat symbols as part of the libpthread move. It turns out they are used by language run-time libraries (e.g., the GCC D front end), so it makes to preserve them as external symbols even though they are not declared in any header file. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
2021-06-15s390x: Align child stack while clone. [BZ #27968]Stefan Liebler
Starting with recent commit 92a7d1343991897f77afe01041f3b77712445e47 "x86-64: Align child stack to 16 bytes [BZ #27902]" the new test misc/tst-misalign-clone has failed on s390x/s390. This patch is now aligning the stack to a double word boundary as also done in start.S files.
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