From 316ca440b070114ba877455c3dbbcdc1b20e4f33 Mon Sep 17 00:00:00 2001
From: Ulrich Drepper <drepper@redhat.com>
Date: Tue, 26 Sep 2000 07:56:19 +0000
Subject: Update.

	* misc/daemon.c (daemon): Fail if !noclose and we cannot open the
	real /dev/null device.

	* sysdeps/generic/check_fds.c: Include device-nrs.h.
	* sysdeps/generic/device-nrs.h: New file.
	* sysdeps/unix/sysv/linux/device-nrs.h: New file.
	* misc/Makefile (distribute): Add device-nrs.h.

	* posix/wordexp.c (exec_comm_child): Likewise.
	* locale/nl_langinfo.c: Allow use of file for __nl_langinfo_l
	definition.
---
 misc/daemon.c | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

(limited to 'misc/daemon.c')

diff --git a/misc/daemon.c b/misc/daemon.c
index bfa5f2e..dddb765 100644
--- a/misc/daemon.c
+++ b/misc/daemon.c
@@ -34,6 +34,9 @@ static char sccsid[] = "@(#)daemon.c	8.1 (Berkeley) 6/4/93";
 #include <fcntl.h>
 #include <paths.h>
 #include <unistd.h>
+#include <sys/stat.h>
+
+#include <device-nrs.h>
 
 int
 daemon(nochdir, noclose)
@@ -57,11 +60,23 @@ daemon(nochdir, noclose)
 		(void)__chdir("/");
 
 	if (!noclose && (fd = __open(_PATH_DEVNULL, O_RDWR, 0)) != -1) {
-		(void)__dup2(fd, STDIN_FILENO);
-		(void)__dup2(fd, STDOUT_FILENO);
-		(void)__dup2(fd, STDERR_FILENO);
-		if (fd > 2)
+		struct stat64 st;
+
+		if (__builtin_expect (__fxstat64 (_STAT_VER, fd, &st), 0) == 0
+		    && __builtin_expect (S_ISCHR (st.st_mode), 1) != 0
+#if defined DEV_NULL_MAJOR && defined DEV_NULL_MINOR
+		    && st.st_rdev == makedev (DEV_NULL_MAJOR, DEV_NULL_MINOR)
+#endif
+		    ) {
+			(void)__dup2(fd, STDIN_FILENO);
+			(void)__dup2(fd, STDOUT_FILENO);
+			(void)__dup2(fd, STDERR_FILENO);
+			if (fd > 2)
+				(void)__close (fd);
+		} else {
 			(void)__close (fd);
+			return -1;
+		}
 	}
 	return (0);
 }
-- 
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