mesg: make in NOFORK

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 7 insertions, 2 deletions

diff --git a/util-linux/mesg.c b/util-linux/mesg.c
index c4371eb24..91c05317e 100644
--- a/util-linux/mesg.c
+++ b/util-linux/mesg.c
@@ -26,7 +26,7 @@
 //config:       If you set this option to N, "mesg y" will enable writing
 //config:       by anybody at all. This is not recommended.
 
-//applet:IF_MESG(APPLET(mesg, BB_DIR_USR_BIN, BB_SUID_DROP))
+//applet:IF_MESG(APPLET_NOFORK(mesg, mesg, BB_DIR_USR_BIN, BB_SUID_DROP, mesg))
 
 //kbuild:lib-$(CONFIG_MESG) += mesg.o
 
@@ -60,10 +60,15 @@ int mesg_main(int argc UNUSED_PARAM, char **argv)
                 bb_show_usage();
         }
 
+        /* We are a NOFORK applet.
+         * (Not that it's very useful, but code is trivially NOFORK-safe).
+         * Play nice. Do not leak anything.
+         */
+
         if (!isatty(STDIN_FILENO))
                 bb_error_msg_and_die("not a tty");
 
-        xfstat(STDIN_FILENO, &sb, "stderr");
+        xfstat(STDIN_FILENO, &sb, "stdin");
         if (c == 0) {
                 puts((sb.st_mode & (S_IWGRP|S_IWOTH)) ? "is y" : "is n");
                 return EXIT_SUCCESS;