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      1 /*	$NetBSD: duplex_pipe.c,v 1.2 2025/02/25 19:15:51 christos Exp $	*/
      2 
      3 /*++
      4 /* NAME
      5 /*	duplex_pipe 3
      6 /* SUMMARY
      7 /*	local IPD
      8 /* SYNOPSIS
      9 /*	#include <iostuff.h>
     10 /*
     11 /*	int	duplex_pipe(fds)
     12 /*	int	*fds;
     13 /* DESCRIPTION
     14 /*	duplex_pipe() uses whatever local primitive it takes
     15 /*	to get a two-way I/O channel.
     16 /* DIAGNOSTICS
     17 /*	A null result means success. In case of error, the result
     18 /*	is -1 and errno is set to the appropriate number.
     19 /* LICENSE
     20 /* .ad
     21 /* .fi
     22 /*	The Secure Mailer license must be distributed with this software.
     23 /* AUTHOR(S)
     24 /*	Wietse Venema
     25 /*	IBM T.J. Watson Research
     26 /*	P.O. Box 704
     27 /*	Yorktown Heights, NY 10598, USA
     28 /*--*/
     29 
     30 /* System libraries */
     31 
     32 #include <sys_defs.h>
     33 #include <sys/socket.h>
     34 #include <unistd.h>
     35 
     36 /* Utility library. */
     37 
     38 #include "iostuff.h"
     39 #include "sane_socketpair.h"
     40 
     41 /* duplex_pipe - give me a duplex pipe or bust */
     42 
     43 int     duplex_pipe(int *fds)
     44 {
     45 #ifdef HAS_DUPLEX_PIPE
     46     return (pipe(fds));
     47 #else
     48     return (sane_socketpair(AF_UNIX, SOCK_STREAM, 0, fds));
     49 #endif
     50 }
     51