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prevent sigprocmask/pthread_sigmask from blocking implementation signals

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this code was wrongly disabled because the old version was trying to
be too clever and didn't work. replaced it with a simple version for
now.
This commit is contained in:
Rich Felker
2011-02-19 10:51:13 -05:00
parent fb11b6b85e
commit a49c119276
1 changed files with 5 additions and 3 deletions
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8
src/signal/sigprocmask.c
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@@ -1,6 +1,7 @@
#include <signal.h> #include <signal.h>
#include "syscall.h" #include "syscall.h"
#include "libc.h" #include "libc.h"
#include "pthread_impl.h"
int __libc_sigprocmask(int how, const sigset_t *set, sigset_t *old) int __libc_sigprocmask(int how, const sigset_t *set, sigset_t *old)
{ {
@@ -10,11 +11,12 @@ int __libc_sigprocmask(int how, const sigset_t *set, sigset_t *old)
int __sigprocmask(int how, const sigset_t *set, sigset_t *old) int __sigprocmask(int how, const sigset_t *set, sigset_t *old)
{ {
sigset_t tmp; sigset_t tmp;
/* Quickly mask out bits 32 and 33 (thread control signals) */ /* Disallow blocking thread control signals */
if (0 && how != SIG_UNBLOCK && (set->__bits[4/sizeof *set->__bits] & 3UL<<(32&8*sizeof *set->__bits-1))) { if (how != SIG_UNBLOCK) {
tmp = *set; tmp = *set;
set = &tmp; set = &tmp;
tmp.__bits[4/sizeof *set->__bits] &= ~(3UL<<(32&8*sizeof *set->__bits-1)); sigdelset(&tmp, SIGCANCEL);
sigdelset(&tmp, SIGSYSCALL);
} }
return __libc_sigprocmask(how, set, old); return __libc_sigprocmask(how, set, old);
} }