amiga-ixemul/library/set_socket_stdio.c

/*
 *      set_socket_stdio.c - redirect stdio to/from a socket
 *
 *      Copyright © 1994 AmiTCP/IP Group,
 *                       Network Solutions Development Inc.
 *                       All rights reserved.
 *      Portions Copyright © 1995 Jeff Shepherd
 *
 *      $Id: set_socket_stdio.c,v 1.1.1.1 2005/03/15 15:57:08 laire Exp $
 */

/****** net.lib/set_socket_stdio ****************************************

    NAME
	set_socket_stdio - redirect stdio to/from a socket

    SYNOPSIS
	int set_socket_stdio(int sock);

    FUNCTION
	Redirect stdio (stdin, stdout and stderr) to/from socket 'sock'.
	This is done by dup2()'ing 'sock' to the level 1 files underneath
	the stdin, stdout and stderr.

	The original 'sock' reference is closed on successful return, so
	the socket descriptor given as argument should not be used after
	this function returns (successfully).

    RETURN VALUES
	0 if successful, -1 on error. Global variable 'errno' contains
	the specific error code set by the failing function.

    NOTES
	This module pulls in the link library stdio modules.

    SEE ALSO
	dup2()
*****************************************************************************
*
*/

#define _KERNEL
#include "ixemul.h"

#include <stdio.h>
#include <stdlib.h>

int
set_socket_stdio(int sock)
{
    /*
     * Replace the stdio with the sock
     */
    if (sock >= 0 && syscall(SYS_dup2,sock, 0) >= 0
      && syscall(SYS_dup2, sock, 1) >= 0
      && syscall(SYS_dup2, sock, 2) >= 0) {
	/*
	 * Close the original reference to the sock if necessary
	 */
	if (sock > 2)
	    syscall(SYS_close, sock);

	return 0;
    }
    return -1;
}