duplex_pipe.c

[詳解]

/*++
/* NAME
/*  duplex_pipe 3
/* SUMMARY
/*  local IPD
/* SYNOPSIS
/*  #include <iostuff.h>
/*
/*  int duplex_pipe(fds)
/*  int *fds;
/* DESCRIPTION
/*  duplex_pipe() uses whatever local primitive it takes
/*  to get a two-way I/O channel.
/* DIAGNOSTICS
/*  A null result means success. In case of error, the result
/*  is -1 and errno is set to the appropriate number.
/* 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 libraries */

#include <sys_defs.h>
#include <sys/socket.h>
#include <unistd.h>

/* Utility library. */

#include "iostuff.h"
#include "sane_socketpair.h"

/* duplex_pipe - give me a duplex pipe or bust */

int     duplex_pipe(int *fds)
{
#ifdef HAS_DUPLEX_PIPE
    return (pipe(fds));
#else
    return (sane_socketpair(AF_UNIX, SOCK_STREAM, 0, fds));
#endif
}