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      1 /* Test to check that the mask parameter of the sigresend syscall is handled
      2    correctly. */
      3 
      4 #include <assert.h>
      5 #include <signal.h>
      6 #include <stdio.h>
      7 #include <string.h>
      8 #include <sys/syscall.h>
      9 #include <unistd.h>
     10 
     11 static void signal_handler(int signo, siginfo_t *info, void *uc)
     12 {
     13    ssize_t written;
     14    const char str[] = "Signal caught.\n";
     15    size_t len = sizeof(str) - 1;
     16    sigset_t current;
     17 
     18    written = write(STDOUT_FILENO, str, len);
     19    assert(written == len);
     20 
     21    /* Check that SIGUSR1 is already blocked in the signal handler. */
     22    assert(!sigprocmask(SIG_BLOCK, NULL, &current));
     23    assert(sigismember(&current, SIGUSR1));
     24 }
     25 
     26 int main(void)
     27 {
     28    sigset_t block, current;
     29    struct sigaction sa;
     30 
     31    /* Check that SIGUSR1 is unblocked. */
     32    if (sigprocmask(0, NULL, &current)) {
     33       perror("sigprocmask");
     34       return 1;
     35    }
     36    assert(!sigismember(&current, SIGUSR1));
     37 
     38    /* Establish a SIGINT handler. */
     39    sa.sa_sigaction = signal_handler;
     40    sa.sa_flags = SA_RESTART | SA_SIGINFO;
     41    if (sigfillset(&sa.sa_mask)) {
     42       perror("sigfillset");
     43       return 1;
     44    }
     45    if (sigaction(SIGINT, &sa, NULL)) {
     46       perror("sigaction");
     47       return 1;
     48    }
     49 
     50    /* Send us a signal to handle and install a new sigmask. */
     51    if (sigemptyset(&block)) {
     52       perror("sigemptyset");
     53       return 1;
     54    }
     55    if (sigaddset(&block, SIGUSR1)) {
     56       perror("sigaddset");
     57       return 1;
     58    }
     59    if (syscall(SYS_sigresend, SIGINT, NULL, &block)) {
     60       fprintf(stderr, "Sigresend failed.\n");
     61       return 1;
     62    }
     63 
     64    /* Check that SIGUSR1 is now blocked. */
     65    if (sigprocmask(SIG_BLOCK, NULL, &current)) {
     66       perror("sigprocmask");
     67       return 1;
     68    }
     69    assert(sigismember(&current, SIGUSR1));
     70 
     71    return 0;
     72 }
     73 
     74