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 ) {
  18    struct sigaction sa;
  19    struct sigaction oldsa;
  20    int r, e;
  21
  22    sa.sa_handler = NULL;
  23    sa.sa_sigaction = abrt_handler;
  24    sigemptyset( &sa.sa_mask );
  25    sa.sa_flags = SA_SIGINFO;
  26
  27    sigaction( SIGABRT, &sa, &oldsa );
  28
  29    if ( ( e = sigsetjmp( env, 1 ) ) == 0 ) {
  30      r = sem_post( sem );
  31    } else {
  32      r = -1;
  33    }
  34    errno = e;
  35
  36    sigaction( SIGABRT, &oldsa, NULL );
  37
  38    return r;
  39 }
  40
  41 #define sem_post safe_sem_post