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Annotation of 43BSDReno/lib/libc/gen/siginterrupt.c, revision 1.1.1.1

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(LIBC_SCCS) && !defined(lint)
                     21: static char sccsid[] = "@(#)siginterrupt.c     5.5 (Berkeley) 6/1/90";
                     22: #endif /* LIBC_SCCS and not lint */
                     23: 
                     24: #include <signal.h>
                     25: 
                     26: /*
                     27:  * Set signal state to prevent restart of system calls
                     28:  * after an instance of the indicated signal.
                     29:  */
                     30: siginterrupt(sig, flag)
                     31:        int sig, flag;
                     32: {
                     33:        extern sigset_t _sigintr;
                     34:        struct sigaction sa;
                     35:        int ret;
                     36: 
                     37:        if ((ret = sigaction(sig, (struct sigaction *)0, &sa)) < 0)
                     38:                return (ret);
                     39:        if (flag) {
                     40:                sigaddset(&_sigintr, sig);
                     41:                sa.sa_flags &= ~SA_RESTART;
                     42:        } else {
                     43:                sigdelset(&_sigintr, sig);
                     44:                sa.sa_flags |= SA_RESTART;
                     45:        }
                     46:        return (sigaction(sig, &sa, (struct sigaction *)0));
                     47: }

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