Source of signal.c - linux-imx - PHYTEC BitBucket (Stash)

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​
    if (info) {
        ret = copy_siginfo_from_user_any(&kinfo, info);
        if (unlikely(ret))
            goto err;
​
        ret = -EINVAL;
        if (unlikely(sig != kinfo.si_signo))
            goto err;
​
        /* Only allow sending arbitrary signals to yourself. */
        ret = -EPERM;
        if ((task_pid(current) != pid) &&
            (kinfo.si_code >= 0 || kinfo.si_code == SI_TKILL)) {
            /* Only allow sending arbitrary signals to yourself. */
            ret = -EPERM;
            if (kinfo.si_code != SI_USER)
                goto err;
​
            /* Turn this into a regular kill signal. */
            prepare_kill_siginfo(sig, &kinfo);
        }
            (kinfo.si_code >= 0 || kinfo.si_code == SI_TKILL))
            goto err;
    } else {
        prepare_kill_siginfo(sig, &kinfo);
    }
​
    ret = kill_pid_info(sig, &kinfo, pid);
​
err:
    fdput(f);
    return ret;
}