helgrind/tests/safe-semaphore.h

   1 #include <semaphore.h>
   2 #include <signal.h>
   3 #include <setjmp.h>
   4 #include <errno.h>
   5 #include <assert.h>
   6
   7 static sigjmp_buf env;
   8
   9 /*
  10  * Newer glibc crashes on really bogus semaphors.
  11  * Catch a SIGABRT and turn it into a EINVAL.
  12  */
  13 static void abrt_handler( int signum, siginfo_t *siginfo, void *sigcontext ) {
  14    siglongjmp( env, EINVAL );
  15 }
  16
  17 static int safe_sem_post( sem_t *sem ) __attribute__((unused));
  18 static int safe_sem_post( sem_t *sem ) {
  19    struct sigaction sa;
  20    struct sigaction oldsa;
  21    int r, e;
  22
  23    sa.sa_handler = NULL;
  24    sa.sa_sigaction = abrt_handler;
  25    sigemptyset( &sa.sa_mask );
  26    sa.sa_flags = SA_SIGINFO;
  27
  28    sigaction( SIGABRT, &sa, &oldsa );
  29
  30    if ( ( e = sigsetjmp( env, 1 ) ) == 0 ) {
  31      r = sem_post( sem );
  32    } else {
  33      r = -1;
  34    }
  35    errno = e;
  36
  37    sigaction( SIGABRT, &oldsa, NULL );
  38
  39    return r;
  40 }
  41
  42 #define sem_post safe_sem_post