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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/internal/pthread_impl.h
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/internal/pthread_impl.h')
-rw-r--r--src/internal/pthread_impl.h9
1 files changed, 6 insertions, 3 deletions
diff --git a/src/internal/pthread_impl.h b/src/internal/pthread_impl.h
index 049f5dfb..24cbeb25 100644
--- a/src/internal/pthread_impl.h
+++ b/src/internal/pthread_impl.h
@@ -75,9 +75,12 @@ struct __timer {
#include "pthread_arch.h"
-#define SIGCANCEL 32
-#define SIGSYSCALL 33
-#define SIGTIMER 34
+#define SIGTIMER 32
+#define SIGCANCEL 33
+#define SIGSYSCALL 34
+
+#define SIGPT_SET ((sigset_t){{[sizeof(long)==4] = 3<<(32*(sizeof(long)>4))}})
+#define SIGTIMER_SET ((sigset_t){{ 0x80000000 }})
int __set_thread_area(void *);
int __libc_sigaction(int, const struct sigaction *, struct sigaction *);