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authorJim Meyering <jim@meyering.net>2004-03-03 22:01:32 +0000
committerJim Meyering <jim@meyering.net>2004-03-03 22:01:32 +0000
commitf0970dc4a87242a4a934b8bc5e285cfa4d7cfab0 (patch)
tree08d94d54f3c1090777c700ef72565eda2627ea42 /lib
parent8d0b9f87dd5032e705a16fd7c3875cfb4e32b26e (diff)
downloadcoreutils-f0970dc4a87242a4a934b8bc5e285cfa4d7cfab0.tar.xz
New file.
The set_cloexec_flag implementation imported from GNU C Library Reference Manual.
Diffstat (limited to 'lib')
-rw-r--r--lib/cloexec.c67
1 files changed, 67 insertions, 0 deletions
diff --git a/lib/cloexec.c b/lib/cloexec.c
new file mode 100644
index 000000000..46a0d7151
--- /dev/null
+++ b/lib/cloexec.c
@@ -0,0 +1,67 @@
+/* closexec.c - set or clear the close-on-exec descriptor flag
+ Copyright (C) 1991, 2004 Free Software Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2, or (at your option)
+ any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software Foundation,
+ Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+
+ The code is taken from glibc/manual/llio.texi */
+
+#if HAVE_CONFIG_H
+# include <config.h>
+#endif
+
+#if HAVE_FCNTL_H
+# include <fcntl.h>
+#endif
+
+#if HAVE_UNISTD_H
+# include <unistd.h>
+#endif
+
+#include "cloexec.h"
+
+#ifndef FD_CLOEXEC
+# define FD_CLOEXEC 1
+#endif
+
+/* Set the `FD_CLOEXEC' flag of DESC if VALUE is nonzero,
+ or clear the flag if VALUE is 0.
+ Return 0 on success, or -1 on error with `errno' set. */
+
+int
+set_cloexec_flag (int desc, int value)
+{
+#if defined F_GETFD && defined F_SETFD
+
+ int flags = fcntl (desc, F_GETFD, 0);
+
+ /* If reading the flags failed, return error indication. */
+ if (flags == -1)
+ return flags;
+
+ /* Set just the flag we want to set. */
+ if (value != 0)
+ flags |= FD_CLOEXEC;
+ else
+ flags &= ~FD_CLOEXEC;
+
+ /* Store modified flags in the descriptor. */
+ return fcntl (desc, F_SETFD, flags);
+
+#else
+
+ return 0;
+
+#endif
+}