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* clock_nanosleep: add time64 syscall support, decouple 32-bit time_tRich Felker2019-07-281-0/+25
| | | | | | | | | | | time64 syscall is used only if it's the only one defined for the arch, or if the requested time does not fit in 32 bits. on current 32-bit archs where time_t is a 32-bit type, this makes it statically unreachable. on 64-bit archs, there is no change to the code after preprocessing. on current 32-bit archs, the time is moved through an intermediate copy to remove the assumption that time_t is a 32-bit type.
* refactor thrd_sleep and nanosleep in terms of clock_nanosleepRich Felker2019-07-271-3/+7
| | | | | | | | | | | for namespace-safety with thrd_sleep, this requires an alias, which is also added. this eliminates all but one direct call point for nanosleep syscalls, and arranges that 64-bit time_t conversion logic will only need to exist in one file rather than three. as a bonus, clock_nanosleep with CLOCK_REALTIME and empty flags is now implemented as SYS_nanosleep, thereby working on older kernels that may lack POSIX clocks functionality.
* reduce spurious inclusion of libc.hRich Felker2018-09-121-1/+0
| | | | | | | | | | | | | | | | | | | | | libc.h was intended to be a header for access to global libc state and related interfaces, but ended up included all over the place because it was the way to get the weak_alias macro. most of the inclusions removed here are places where weak_alias was needed. a few were recently introduced for hidden. some go all the way back to when libc.h defined CANCELPT_BEGIN and _END, and all (wrongly implemented) cancellation points had to include it. remaining spurious users are mostly callers of the LOCK/UNLOCK macros and files that use the LFS64 macro to define the awful *64 aliases. in a few places, new inclusion of libc.h is added because several internal headers no longer implicitly include libc.h. declarations for __lockfile and __unlockfile are moved from libc.h to stdio_impl.h so that the latter does not need libc.h. putting them in libc.h made no sense at all, since the macros in stdio_impl.h are needed to use them correctly anyway.
* fix clock_nanosleep error caseDaniel Sabogal2016-10-201-1/+3
| | | | | | posix requires that EINVAL be returned if the first parameter specifies the cpu-time clock of the calling thread (CLOCK_THREAD_CPUTIME_ID). linux returns ENOTSUP instead so we handle this.
* overhaul pthread cancellationRich Felker2011-04-171-5/+1
| | | | | | | | | | | | | | | | | | | | | | this patch improves the correctness, simplicity, and size of cancellation-related code. modulo any small errors, it should now be completely conformant, safe, and resource-leak free. the notion of entering and exiting cancellation-point context has been completely eliminated and replaced with alternative syscall assembly code for cancellable syscalls. the assembly is responsible for setting up execution context information (stack pointer and address of the syscall instruction) which the cancellation signal handler can use to determine whether the interrupted code was in a cancellable state. these changes eliminate race conditions in the previous generation of cancellation handling code (whereby a cancellation request received just prior to the syscall would not be processed, leaving the syscall to block, potentially indefinitely), and remedy an issue where non-cancellable syscalls made from signal handlers became cancellable if the signal handler interrupted a cancellation point. x86_64 asm is untested and may need a second try to get it right.
* consistency: change all remaining syscalls to use SYS_ rather than __NR_ prefixRich Felker2011-04-061-1/+1
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* if returning errno value directly from a syscall, we need to negate it.Rich Felker2011-03-191-1/+1
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* syscall overhaul part two - unify public and internal syscall interfaceRich Felker2011-03-191-2/+1
| | | | | | | | | | | | | | | | with this patch, the syscallN() functions are no longer needed; a variadic syscall() macro allows syscalls with anywhere from 0 to 6 arguments to be made with a single macro name. also, manually casting each non-integer argument with (long) is no longer necessary; the casts are hidden in the macros. some source files which depended on being able to define the old macro SYSCALL_RETURNS_ERRNO have been modified to directly use __syscall() instead of syscall(). references to SYSCALL_SIGSET_SIZE and SYSCALL_LL have also been changed. x86_64 has not been tested, and may need a follow-up commit to fix any minor bugs/oversights.
* more cancellation points: tcdrain, clock_nanosleepRich Felker2011-03-101-1/+6
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* implement the remaining clock_* interfacesRich Felker2011-02-191-0/+8