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Annotation of 43BSDReno/lib/libc/i386/sys/sigprocmask.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 provided
        !             9:  * that: (1) source distributions retain this entire copyright notice and
        !            10:  * comment, and (2) distributions including binaries display the following
        !            11:  * acknowledgement:  ``This product includes software developed by the
        !            12:  * University of California, Berkeley and its contributors'' in the
        !            13:  * documentation or other materials provided with the distribution and in
        !            14:  * all advertising materials mentioning features or use of this software.
        !            15:  * Neither the name of the University nor the names of its contributors may
        !            16:  * be used to endorse or promote products derived from this software without
        !            17:  * specific prior written permission.
        !            18:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            19:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            20:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            21:  */
        !            22: 
        !            23: #if defined(SYSLIBC_SCCS) && !defined(lint)
        !            24:        .asciz "@(#)sigprocmask.s       5.1 (Berkeley) 7/1/90"
        !            25: #endif /* SYSLIBC_SCCS and not lint */
        !            26: 
        !            27: #include "SYS.h"
        !            28: 
        !            29: err:
        !            30:        jmp     cerror
        !            31: 
        !            32: ENTRY(sigprocmask)
        !            33:        movl    8(%esp),%ecx            # fetch new sigset pointer
        !            34:        cmpl    $0,(%ecx)               # check new sigset pointer
        !            35:        jne     1f                      # if not null, indirect
        !            36: /*     movl    $0,8(%esp)              # null mask pointer: block empty set */
        !            37:        movl    $1,4(%esp)              # SIG_BLOCK
        !            38:        jmp     2f
        !            39: 1:     movl    (%ecx),%ecx             # fetch indirect  ...
        !            40:        movl    %ecx,8(%esp)            # to new mask arg
        !            41: 2:     movl    $ SYS_sigprocmask , %eax
        !            42:        LCALL(0x7,0)
        !            43:        jb      err
        !            44:        movl    12(%esp),%ecx           # fetch old mask requested
        !            45:        cmpl    $0,%ecx                 # test if old mask requested
        !            46:        je      out
        !            47:        movl    %eax,(%ecx)             # store old mask
        !            48: out:
        !            49:        xorl    %eax,%eax
        !            50:        ret

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