]>
Commit | Line | Data |
---|---|---|
9385eb3d A |
1 | /* |
2 | * Copyright (c) 1985, 1993 | |
e9ce8d39 A |
3 | * The Regents of the University of California. All rights reserved. |
4 | * | |
e9ce8d39 A |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
8 | * 1. Redistributions of source code must retain the above copyright | |
9 | * notice, this list of conditions and the following disclaimer. | |
10 | * 2. Redistributions in binary form must reproduce the above copyright | |
11 | * notice, this list of conditions and the following disclaimer in the | |
12 | * documentation and/or other materials provided with the distribution. | |
e9ce8d39 A |
13 | * 4. Neither the name of the University nor the names of its contributors |
14 | * may be used to endorse or promote products derived from this software | |
15 | * without specific prior written permission. | |
16 | * | |
17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
27 | * SUCH DAMAGE. | |
28 | */ | |
29 | ||
30 | #if defined(LIBC_SCCS) && !defined(lint) | |
9385eb3d | 31 | static char sccsid[] = "@(#)ualarm.c 8.1 (Berkeley) 6/4/93"; |
e9ce8d39 | 32 | #endif /* LIBC_SCCS and not lint */ |
9385eb3d | 33 | #include <sys/cdefs.h> |
1f2f436a | 34 | __FBSDID("$FreeBSD: src/lib/libc/gen/ualarm.c,v 1.5 2007/01/09 00:27:56 imp Exp $"); |
e9ce8d39 | 35 | |
9385eb3d | 36 | #include <sys/time.h> |
e9ce8d39 | 37 | #include <unistd.h> |
e9ce8d39 | 38 | |
9385eb3d A |
39 | #define USPS 1000000 /* # of microseconds in a second */ |
40 | ||
41 | /* | |
42 | * Generate a SIGALRM signal in ``usecs'' microseconds. | |
43 | * If ``reload'' is non-zero, keep generating SIGALRM | |
44 | * every ``reload'' microseconds after the first signal. | |
45 | */ | |
3d9156a7 | 46 | useconds_t |
9385eb3d | 47 | ualarm(usecs, reload) |
3d9156a7 A |
48 | useconds_t usecs; |
49 | useconds_t reload; | |
e9ce8d39 | 50 | { |
9385eb3d A |
51 | struct itimerval new, old; |
52 | ||
53 | new.it_interval.tv_usec = reload % USPS; | |
54 | new.it_interval.tv_sec = reload / USPS; | |
55 | ||
56 | new.it_value.tv_usec = usecs % USPS; | |
57 | new.it_value.tv_sec = usecs / USPS; | |
5b2abdfb | 58 | |
9385eb3d A |
59 | if (setitimer(ITIMER_REAL, &new, &old) == 0) |
60 | return (old.it_value.tv_sec * USPS + old.it_value.tv_usec); | |
61 | /* else */ | |
5b2abdfb | 62 | return (-1); |
e9ce8d39 | 63 | } |