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fix breakage in synccall due to incorrect signal restoration in sigqueue

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commit 07827d1a82 seems to have
introduced this issue. sigqueue is called from the synccall core, at
which time, even implementation-internal signals are blocked. however,
pthread_sigmask removes the implementation-internal signals from the
old mask before returning, so that a process which began life with
them blocked will not be able to save a signal mask that has them
blocked, possibly causing them to become re-blocked later. however,
this was causing sigqueue to unblock the implementation-internal
signals during synccall, leading to deadlock.
This commit is contained in:
Rich Felker 2013-08-31 01:12:00 -04:00
parent d0f0fa484c
commit 7cc49f98a2
1 changed files with 3 additions and 2 deletions
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5
src/signal/sigqueue.c
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@ -3,6 +3,7 @@
#include <unistd.h>
#include <stdint.h>
#include "syscall.h"
#include "pthread_impl.h"
int sigqueue(pid_t pid, int sig, const union sigval value)
{
@ -14,9 +15,9 @@ int sigqueue(pid_t pid, int sig, const union sigval value)
si.si_code = SI_QUEUE;
si.si_value = value;
si.si_uid = getuid();
pthread_sigmask(SIG_BLOCK, (void *)(uint64_t[1]){-1}, &set);
__block_app_sigs(&set);
si.si_pid = getpid();
r = syscall(SYS_rt_sigqueueinfo, pid, sig, &si);
pthread_sigmask(SIG_SETMASK, &set, 0);
__restore_sigs(&set);
return r;
}