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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);
}
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