memcheck/tests/sigprocmask.c

   1
   2 #include <signal.h>
   3 #include <stdio.h>
   4 #include <sys/syscall.h>
   5 #include <unistd.h>
   6
   7 // Reg test for bug #93328: we were using too-big sigset types, and thus
   8 // trashing memory when we wrote out the 'oldset' param from sigprocmask().
   9
  10 int main(void)
  11 {
  12 #if defined(__NR_sigprocmask)        \
  13     && !defined(__powerpc64__)       \
  14     && !defined(__s390x__)           \
  15     && !defined(__arm__)
  16
  17    // arm-linux uses rt_sigprocmask, so no sigset mangling takes place
  18
  19    int x[6], *s, *os, i;
  20
  21    x[0] = 0x11111111;
  22    x[1] = 0x89abcdef;
  23    x[2] = 0x22222222;
  24    x[3] = 0x33333333;
  25    x[4] = 0x0;
  26    x[5] = 0x44444444;
  27
  28    s  = &x[1];
  29    os = &x[4];
  30
  31    // Make sure the system is in a known state with no signals
  32    // blocked as perl has been known to leave some signals blocked
  33    // when starting child processes which can cause failures in
  34    // this test unless we reset things here.
  35    syscall(__NR_sigprocmask, SIG_SETMASK, os, NULL);
  36
  37    fprintf(stderr, "before\n");
  38    for (i = 0; i < 6; i++) {
  39       fprintf(stderr, "%x ", x[i]);
  40    }
  41    fprintf(stderr, "\n");
  42
  43    syscall(__NR_sigprocmask, SIG_BLOCK, s, os);
  44
  45    fprintf(stderr, "after1\n");
  46    for (i = 0; i < 6; i++) {
  47       fprintf(stderr, "%x ", x[i]);
  48    }
  49    fprintf(stderr, "\n");
  50
  51    syscall(__NR_sigprocmask, SIG_BLOCK, s, os);
  52
  53    fprintf(stderr, "after2\n");
  54    for (i = 0; i < 6; i++) {
  55       fprintf(stderr, "%x ", x[i]);
  56    }
  57    fprintf(stderr, "\n");
  58
  59 #else
  60
  61    fprintf(stderr, "__NR_sigprocmask not supported on this platform\n");
  62
  63 #endif
  64
  65    return(0);
  66 }