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 the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 */ 17 18#if defined(SYSLIBC_SCCS) && !defined(lint) 19 .asciz "@(#)sigprocmask.s 5.2 (Berkeley) 10/10/89" 20#endif /* SYSLIBC_SCCS and not lint */ 21 22#include "SYS.h" 23 24err: 25 jmp cerror 26 27ENTRY(sigprocmask) 28 tstl 8(ap) # check new sigset pointer 29 bneq 1f # if not null, indirect 30/* movl $0,8(ap) # null mask pointer: block empty set */ 31 movl $1,4(ap) # SIG_BLOCK 32 jbr 2f 331: movl *8(ap),8(ap) # indirect to new mask arg 342: chmk $SYS_sigprocmask 35 jcs err 36 tstl 12(ap) # test if old mask requested 37 beql out 38 movl r0,*12(ap) # store old mask 39out: 40 clrl r0 41 ret 42