Document EINVAL; from NetBSD PR 3395

diff --git a/lib/libc/sys/setpgid.2 b/lib/libc/sys/setpgid.2
index 6b2cdbd..1842d5e 100644 (file)
--- a/lib/libc/sys/setpgid.2
+++ b/lib/libc/sys/setpgid.2
@@ -74,6 +74,10 @@ The value of the
 .Fa pid
 argument matches the process ID of a child process of the calling process, 
 and the child process has successfully executed one of the exec functions.
+.It Bq Er EINVAL
+The value of the
+.Fa pgrp
+argument is less than zero.
 .It Bq Er EPERM
 The effective user ID of the requested process is different
 from that of the caller and the process is not a descendant