Libc-320.tar.gz

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

diff --git a/gen/FreeBSD/sleep.c b/gen/FreeBSD/sleep.c
new file mode 100644 (file)
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--- /dev/null
+++ b/gen/FreeBSD/sleep.c
@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 1989, 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[] = "@(#)sleep.c    8.1 (Berkeley) 6/4/93";
+#endif /* LIBC_SCCS and not lint */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD: src/lib/libc/gen/sleep.c,v 1.31 2002/02/01 00:57:29 obrien Exp $");
+
+#include "namespace.h"
+#include <errno.h>
+#include <limits.h>
+#include <time.h>
+#include <unistd.h>
+#include "un-namespace.h"
+
+unsigned int
+__sleep(seconds)
+       unsigned int seconds;
+{
+       struct timespec time_to_sleep;
+       struct timespec time_remaining;
+
+       /*
+        * Avoid overflow when `seconds' is huge.  This assumes that
+        * the maximum value for a time_t is >= INT_MAX.
+        */
+       if (seconds > INT_MAX)
+               return (seconds - INT_MAX + __sleep(INT_MAX));
+
+       time_to_sleep.tv_sec = seconds;
+       time_to_sleep.tv_nsec = 0;
+       if (_nanosleep(&time_to_sleep, &time_remaining) != -1)
+               return (0);
+       if (errno != EINTR)
+               return (seconds);               /* best guess */
+       return (time_remaining.tv_sec +
+               (time_remaining.tv_nsec != 0)); /* round up */
+}
+
+__weak_reference(__sleep, sleep);
+__weak_reference(__sleep, _sleep);