kill: print usage if no pid is passed in command line

Modication of master line patch 27b2937 Signed-off-by: Craig Small <csmall@enc.com.au>
2016-04-11 21:04:41 +10:00 · 2016-04-11 21:04:41 +10:00 · 8d6466a48d
commit 8d6466a48d
parent 6586f9f9ce
1 changed files with 3 additions and 0 deletions
--- a/kill.c
+++ b/kill.c
@ -125,6 +125,9 @@ int main(int argc, char **argv)
    argc -= optind;
    argv += optind;

+    if (argc < 1)
+        print_usage(stderr);
+
    for (i = 0; i < argc; i++) {
        pid = strtol_or_err(argv[i], _("failed to parse argument"));
        if (!kill((pid_t) pid, signo))