chrt: do not try to interpret the --pid option itself as a PID

When not specifying a PID with --pid, `chrt` would report:

  chrt: invalid PID argument: '--pid'

That was silly.  After this change, `chrt --pid` will report:

  chrt: too few arguments

Signed-off-by: Benno Schulenberg <bensberg@telfort.nl>

diff --git a/schedutils/chrt.c b/schedutils/chrt.c
index 415a9aa77a7c72b5c2a20b4ab29d2e6112383d22..a72c0de269b301b26ffbc5b2fda35f6aff2ad253 100644 (file)
--- a/schedutils/chrt.c
+++ b/schedutils/chrt.c
@@ -474,6 +474,8 @@ int main(int argc, char **argv)
                        policy_given = true;
                        break;
                case 'p':
+                       if (argc - optind == 0)
+                               errx(EXIT_FAILURE, _("too few arguments"));
                        errno = 0;
                        /* strtopid_or_err() is not suitable here; 0 can be passed.*/
                        ctl->pid = strtos32_or_err(argv[argc - 1], _("invalid PID argument"));