native/unix-spawn-helper/unix-spawn-helper.c [13:22]:
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void restore_signal(int signum) {
    struct sigaction action;
    memset(&action, 0, sizeof(action));
    action.sa_handler = SIG_DFL;
    sigemptyset(&action.sa_mask);
    action.sa_flags = 0;
    if (sigaction(signum, &action, NULL) != 0) {
        fprintf(stderr, "%s(%d): cannot set SIG_DFL for signal %d: %s\n", __FUNCTION__, __LINE__, signum, strerror(errno));
    }
}
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native/exec_pty.c [42:51]:
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void restore_signal(int signum) {
    struct sigaction action;
    memset(&action, 0, sizeof(action));
    action.sa_handler = SIG_DFL;
    sigemptyset(&action.sa_mask);
    action.sa_flags = 0;
    if (sigaction(signum, &action, NULL) != 0) {
        fprintf(stderr, "%s(%d): cannot set SIG_DFL for signal %d: %s\n", __FUNCTION__, __LINE__, signum, strerror(errno));
    }
}
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