sigaction() not handling flags and mask error

[adamdebek]

sigaction() do not handle flags, it is marked as TODO in code

mask error reproduction (ia32-generic-qemu):

#include <stdio.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>


void handler(int sig) {
    sigset_t handler_set;

    if (sigprocmask(SIG_SETMASK, NULL, &handler_set) < 0) {
        fprintf(stderr, "sigprocmask error\n");
        return;
    }

    if (sigismember(&handler_set, SIGCHLD) != 1) {
        fprintf(stderr, "no caught signal in mask\n");
    }

    if (sigismember(&handler_set, SIGHUP) != 1) {
        fprintf(stderr, "no currently blocked signal in mask\n");
    }

    if (sigismember(&handler_set, SIGPIPE) != 1) {
        fprintf(stderr, "no specified in sigaction signal in mask]n");
    }
}


int main(void) {
    sigset_t set;
    struct sigaction sa;

    sigemptyset(&set);
    sigaddset(&set, SIGHUP);

    if (sigprocmask(SIG_SETMASK, &set, NULL) < 0) {
        perror("sigprocmask");
        exit(EXIT_FAILURE);
    }

    sa.sa_handler = handler;
    sa.sa_flags = 0;
    sigaddset(&set, SIGPIPE);
    sa.sa_mask = set;

    if (sigaction(SIGCHLD, &sa, NULL) < 0) {
        perror("sigaction");
        exit(EXIT_FAILURE);
    }

    if (kill(getpid(), SIGCHLD) < 0) {
        perror("kill");
        exit(EXIT_FAILURE);
    }

    return 0;
}