pipemps.c

来自「开放源码的编译器open watcom 1.6.0版的源代码」· C语言 代码 · 共 61 行

/****************************************************************************
*
*                            Open Watcom Project
*
*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
*  ========================================================================
*
*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
*    Public License version 1.0 (the 'License'). You may not use this file
*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
*    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
*    provided with the Original Code and Modifications, and is also
*    available at www.sybase.com/developer/opensource.
*
*    The Original Code and all software distributed under the License are
*    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
*    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
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*    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
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*  ========================================================================
*
* Description:  Linux pipe() implementation for MIPS.
*
****************************************************************************/


#include <unistd.h>
#include <errno.h>
#include "syslinux.h"

/* The MIPS version is a little unusual - the two descriptors are returned
 * in $v0 and $v1 instead of being written to wherever __fildes points to.
 * That also means $v0 doesn't hold return value in case of success.
 */

int sys_pipe( u_long func, u_long r_4 );
#pragma aux sys_pipe =                          \
    "move   $s0,$a0"                            \
    "syscall"                                   \
    "sw     $v0,0($s0)"                         \
    "sw     $v1,4($s0)"                         \
    parm [$v0] [$a0]                            \
    value [$v0];

_WCRTLINK int pipe( int __fildes[2] )
{
    int res = sys_pipe( SYS_pipe, (u_long)__fildes );
    if( get_a3() ) {
        errno = res;
        res = -1;
    } else {
        res = 0;
    }
    return( res );
}