#define _GNU_SOURCE
#include <signal.h>

#define SST_SIZE (_NSIG / 8 / sizeof(long))

int sigorset(sigset_t* dest, const sigset_t* left, const sigset_t* right) {
    unsigned long i = 0, *d = (void *)dest, *l = (void *)left, *r = (void *)right;
    for (; i < SST_SIZE; i++)
        d[i] = l[i] | r[i];
    return 0;
}