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-rw-r--r--src/util/close_on_exec.c60
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diff --git a/src/util/close_on_exec.c b/src/util/close_on_exec.c
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+/*++
+/* NAME
+/* close_on_exec 3
+/* SUMMARY
+/* set/clear close-on-exec flag
+/* SYNOPSIS
+/* #include <iostuff.h>
+/*
+/* int close_on_exec(int fd, int on)
+/* DESCRIPTION
+/* the \fIclose_on_exec\fR() function manipulates the close-on-exec
+/* flag for the specified open file, and returns the old setting.
+/*
+/* Arguments:
+/* .IP fd
+/* A file descriptor.
+/* .IP on
+/* Use CLOSE_ON_EXEC or PASS_ON_EXEC.
+/* DIAGNOSTICS
+/* All errors are fatal.
+/* LICENSE
+/* .ad
+/* .fi
+/* The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/* Wietse Venema
+/* IBM T.J. Watson Research
+/* P.O. Box 704
+/* Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* System interfaces. */
+
+#include <sys_defs.h>
+#include <fcntl.h>
+
+/* Utility library. */
+
+#include "msg.h"
+
+/* Application-specific. */
+
+#include "iostuff.h"
+
+#define PATTERN FD_CLOEXEC
+
+/* close_on_exec - set/clear close-on-exec flag */
+
+int close_on_exec(fd, on)
+int fd;
+int on;
+{
+ int flags;
+
+ if ((flags = fcntl(fd, F_GETFD, 0)) < 0)
+ msg_fatal("fcntl: get flags: %m");
+ if (fcntl(fd, F_SETFD, on ? flags | PATTERN : flags & ~PATTERN) < 0)
+ msg_fatal("fcntl: set close-on-exec flag %s: %m", on ? "on" : "off");
+ return ((flags & PATTERN) != 0);
+}