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* use tkill instead of tgkill in implementing raiseRich Felker2014-12-181-3/+2
| | | | | | | | | | this shaves off a useless syscall for getting the caller's pid and brings raise into alignment with other functions which were adapted to use tkill rather than tgkill. commit 83dc6eb087633abcf5608ad651d3b525ca2ec35e documents the rationale for this change, and in particular why the tgkill syscall is useless for its designed purpose of avoiding races.
* include cleanups: remove unused headers and add feature test macrosSzabolcs Nagy2013-12-121-1/+0
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* transition to using functions for internal signal blocking/restoringRich Felker2013-04-261-2/+2
| | | | | | | | | | there are several reasons for this change. one is getting rid of the repetition of the syscall signature all over the place. another is sharing the constant masks without costly GOT accesses in PIC. the main motivation, however, is accurately representing whether we want to block signals that might be handled by the application, or all signals.
* optimize/debloat raiseRich Felker2013-04-261-2/+2
| | | | | use __syscall rather than syscall when failure is not possible or not to be considered.
* remove __SYSCALL_SSLEN arch macro in favor of using public _NSIGRich Felker2013-03-261-2/+2
| | | | | | | | | | | | | | the issue at hand is that many syscalls require as an argument the kernel-ABI size of sigset_t, intended to allow the kernel to switch to a larger sigset_t in the future. previously, each arch was defining this size in syscall_arch.h, which was redundant with the definition of _NSIG in bits/signal.h. as it's used in some not-quite-portable application code as well, _NSIG is much more likely to be recognized and understood immediately by someone reading the code, and it's also shorter and less cluttered. note that _NSIG is actually 65/129, not 64/128, but the division takes care of throwing away the off-by-one part.
* fix (hopefully) all hard-coded 8's for kernel sigset_t sizeRich Felker2012-08-091-2/+3
| | | | | | | | | | some minor changes to how hard-coded sets for thread-related purposes are handled were also needed, since the old object sizes were not necessarily sufficient. things have gotten a bit ugly in this area, and i think a cleanup is in order at some point, but for now the goal is just to get the code working on all supported archs including mips, which was badly broken by linux rejecting syscalls with the wrong sigset_t size.
* overhaul implementation-internal signal protectionsRich Felker2011-05-071-5/+3
| | | | | | | | | | | | | | | | | | | the new approach relies on the fact that the only ways to create sigset_t objects without invoking UB are to use the sig*set() functions, or from the masks returned by sigprocmask, sigaction, etc. or in the ucontext_t argument to a signal handler. thus, as long as sigfillset and sigaddset avoid adding the "protected" signals, there is no way the application will ever obtain a sigset_t including these bits, and thus no need to add the overhead of checking/clearing them when sigprocmask or sigaction is called. note that the old code actually *failed* to remove the bits from sa_mask when sigaction was called. the new implementations are also significantly smaller, simpler, and faster due to ignoring the useless "GNU HURD signals" 65-1024, which are not used and, if there's any sanity in the world, never will be used.
* global cleanup to use the new syscall interfaceRich Felker2011-03-201-3/+3
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* fix race condition in raise - just mask signalsRich Felker2011-03-091-9/+9
| | | | | | | | a signal handler could fork after the pid/tid were read, causing the wrong process to be signalled. i'm not sure if this is supposed to have UB or not, but raise is async-signal-safe, so it probably is allowed. the current solution is slightly expensive so this implementation is likely to be changed in the future.
* fix raise semantics with threads.Rich Felker2011-03-091-1/+12
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* initial check-in, version 0.5.0 v0.5.0Rich Felker2011-02-121-0/+7