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Annotation of 43BSDReno/lib/libc/tahoe/sys/sigprocmask.s, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1989 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that: (1) source distributions retain this entire copyright
        !             7:  * notice and comment, and (2) distributions including binaries display
        !             8:  * the following acknowledgement:  ``This product includes software
        !             9:  * developed by the University of California, Berkeley and its contributors''
        !            10:  * in the documentation or other materials provided with the distribution
        !            11:  * and in all advertising materials mentioning features or use of this
        !            12:  * software. Neither the name of the University nor the names of its
        !            13:  * contributors may be used to endorse or promote products derived
        !            14:  * from this software without specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  */
        !            19: 
        !            20: #if defined(SYSLIBC_SCCS) && !defined(lint)
        !            21:        .asciz "@(#)sigprocmask.s       5.2 (Berkeley) 6/1/90"
        !            22: #endif /* SYSLIBC_SCCS and not lint */
        !            23: 
        !            24: #include "SYS.h"
        !            25: 
        !            26: err:
        !            27:        jmp     cerror
        !            28: 
        !            29: ENTRY(sigprocmask)
        !            30:        tstl    8(fp)                   # check new sigset pointer
        !            31:        bneq    1f                      # if not null, indirect
        !            32:        movl    $0,8(fp)                # null mask pointer: block empty set
        !            33:        movl    $1,4(fp)                # SIG_BLOCK
        !            34:        jbr     2f
        !            35: 1:     movl    *8(fp),8(fp)            # indirect to new mask arg
        !            36: 2:     kcall   $SYS_sigprocmask
        !            37:        jcs     err
        !            38:        tstl    12(fp)                  # test if old mask requested
        !            39:        beql    out
        !            40:        movl    r0,*12(fp)              # store old mask
        !            41: out:
        !            42:        clrl    r0
        !            43:        ret

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