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Annotation of 43BSDReno/lib/libc/i386/sys/Ovfork.s, revision 1.1

1.1     ! root        1: /*-
        !             2:  * Copyright (c) 1990 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * This code is derived from software contributed to Berkeley by
        !             6:  * William Jolitz.
        !             7:  *
        !             8:  * Redistribution and use in source and binary forms are permitted
        !             9:  * provided that: (1) source distributions retain this entire copyright
        !            10:  * notice and comment, and (2) distributions including binaries display
        !            11:  * the following acknowledgement:  ``This product includes software
        !            12:  * developed by the University of California, Berkeley and its contributors''
        !            13:  * in the documentation or other materials provided with the distribution
        !            14:  * and in all advertising materials mentioning features or use of this
        !            15:  * software. Neither the name of the University nor the names of its
        !            16:  * contributors may be used to endorse or promote products derived
        !            17:  * from this software without specific prior written permission.
        !            18:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            19:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            20:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            21:  */
        !            22: 
        !            23: #if defined(SYSLIBC_SCCS) && !defined(lint)
        !            24:        .asciz "@(#)Ovfork.s    5.1 (Berkeley) 4/23/90"
        !            25: #endif /* SYSLIBC_SCCS and not lint */
        !            26: 
        !            27: #include "SYS.h"
        !            28: 
        !            29: /*
        !            30:  * pid = vfork();
        !            31:  *
        !            32:  * %edx == 0 in parent process, %edx == 1 in child process.
        !            33:  * %eax == pid of child in parent, %eax == pid of parent in child.
        !            34:  *
        !            35:  */
        !            36:        .set    vfork,66
        !            37: .globl _vfork
        !            38: 
        !            39: _vfork:
        !            40:        popl    %ecx            /* my rta into ecx */
        !            41:        movl    $vfork, %eax
        !            42:        LCALL(7,0)
        !            43:        jb      verror
        !            44: vforkok:
        !            45:        cmpl    $0,%edx         /* child process? */
        !            46:        jne     child           /* yes */
        !            47:        jmp     parent 
        !            48: .globl _errno
        !            49: verror:
        !            50:        movl    %eax,_errno
        !            51:        movl    $-1,%eax
        !            52:        jmp     %ecx
        !            53: child:
        !            54:        movl    $0,%eax
        !            55: parent:
        !            56:        jmp     %ecx

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