4.3BSD-UWisc/src/lib/libc/gen/siginterrupt.c

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#if defined(LIBC_RCS) && !defined(lint)
static char rcs_id[] =
	"$Header: siginterrupt.c,v 1.3 86/09/08 14:45:20 tadl Exp $";
#endif
/*
 * RCS info
 *	$Locker:  $
 */
/*
 * Copyright (c) 1985 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)siginterrupt.c	5.2 (Berkeley) 3/9/86";
#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, 0, &sv)) < 0)
		return (ret);
	if (flag)
		sv.sv_flags |= SV_INTERRUPT;
	else
		sv.sv_flags &= ~SV_INTERRUPT;
	return (sigvec(sig, &sv, 0));
}