1 files changed, 6 insertions, 4 deletions

diff --git a/miscutils/setsid.c b/miscutils/setsid.c
index 110bb6bb6..014de51e5 100644
--- a/miscutils/setsid.c
+++ b/miscutils/setsid.c
@@ -4,7 +4,7 @@
  * Rick Sladkey <jrs@world.std.com>
  * In the public domain.
  *
- * 1999-02-22 Arkadiusz Mi¶kiewicz <misiek@pld.ORG.PL>
+ * 1999-02-22 Arkadiusz Mickiewicz <misiek@pld.ORG.PL>
  * - added Native Language Support
  *
  * 2001-01-18 John Fremlin <vii@penguinpowered.com>
@@ -17,12 +17,14 @@
 #include "libbb.h"
 
 int setsid_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
-int setsid_main(int argc, char **argv)
+int setsid_main(int argc ATTRIBUTE_UNUSED, char **argv)
 {
-        if (argc < 2)
+        if (!argv[1])
                 bb_show_usage();
 
-        /* Comment why is this necessary? */
+        /* setsid() is allowed only when we are not a process group leader.
+         * Otherwise our PID serves as PGID of some existing process group
+         * and cannot be used as PGID of a new process group. */
         if (getpgrp() == getpid())
                 forkexit_or_rexec(argv);