Libc-320.tar.gz

[apple/libc.git] / gen / FreeBSD / ualarm.c

diff --git a/gen/FreeBSD/ualarm.c b/gen/FreeBSD/ualarm.c
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+/*
+ * Copyright (c) 1985, 1993
+ *     The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *     This product includes software developed by the University of
+ *     California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)ualarm.c   8.1 (Berkeley) 6/4/93";
+#endif /* LIBC_SCCS and not lint */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD: src/lib/libc/gen/ualarm.c,v 1.3 2002/02/01 01:08:48 obrien Exp $");
+
+#include <sys/time.h>
+#include <unistd.h>
+
+#define        USPS    1000000         /* # of microseconds in a second */
+
+/*
+ * Generate a SIGALRM signal in ``usecs'' microseconds.
+ * If ``reload'' is non-zero, keep generating SIGALRM
+ * every ``reload'' microseconds after the first signal.
+ */
+unsigned
+ualarm(usecs, reload)
+       unsigned usecs;
+       unsigned reload;
+{
+       struct itimerval new, old;
+
+       new.it_interval.tv_usec = reload % USPS;
+       new.it_interval.tv_sec = reload / USPS;
+
+       new.it_value.tv_usec = usecs % USPS;
+       new.it_value.tv_sec = usecs / USPS;
+
+       if (setitimer(ITIMER_REAL, &new, &old) == 0)
+               return (old.it_value.tv_sec * USPS + old.it_value.tv_usec);
+       /* else */
+               return (-1);
+}