usr/src/lib/libc/gen/siginterrupt.c

/*
 * Copyright (c) 1988 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Berkeley.  The name of the
 * University may not be used to endorse or promote products derived
 * from this software without specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)siginterrupt.c      5.3 (Berkeley) %G%";
#endif /* LIBC_SCCS and not lint */

#include <signal.h>

/*
 * Set signal state to prevent restart of system calls
 * after an instance of the indicated signal.
 */
siginterrupt(sig, flag)
        int sig, flag;
{
        struct sigvec sv;
        int ret;

        if ((ret = sigvec(sig, (struct sigvec *)0, &sv)) < 0)
                return (ret);
        if (flag)
                sv.sv_flags |= SV_INTERRUPT;
        else
                sv.sv_flags &= ~SV_INTERRUPT;
        return (sigvec(sig, &sv, (struct sigvec *)0));
}