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Annotation of 43BSDReno/lib/libc/i386/sys/Ovfork.s, revision 1.1.1.1

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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