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authorRich Felker <dalias@aerifal.cx>2011-05-07 23:23:58 -0400
committerRich Felker <dalias@aerifal.cx>2011-05-07 23:23:58 -0400
commit99b8a25e941e54537bf39ca2f265c345f393f112 (patch)
tree758faba1a20af40b5d09221d008eddbc704636fa /src/time
parent77f15d108ee021d4dfbeebe793661131c4470d4d (diff)
downloadmusl-99b8a25e941e54537bf39ca2f265c345f393f112.tar.gz
overhaul implementation-internal signal protections
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.
Diffstat (limited to 'src/time')
-rw-r--r--src/time/timer_create.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/src/time/timer_create.c b/src/time/timer_create.c
index cc10bef0..3bcfa951 100644
--- a/src/time/timer_create.c
+++ b/src/time/timer_create.c
@@ -51,8 +51,7 @@ static void install_handler()
.sa_flags = SA_SIGINFO | SA_RESTART
};
__libc_sigaction(SIGTIMER, &sa, 0);
- sigaddset(&sa.sa_mask, SIGTIMER);
- __libc_sigprocmask(SIG_UNBLOCK, &sa.sa_mask, 0);
+ __syscall(SYS_rt_sigprocmask, SIG_UNBLOCK, &SIGTIMER_SET, 0, 8);
}
static void *start(void *arg)