diff options
Diffstat (limited to 'lib/libc/gen/ualarm.c')
| -rw-r--r-- | lib/libc/gen/ualarm.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/lib/libc/gen/ualarm.c b/lib/libc/gen/ualarm.c new file mode 100644 index 00000000000..2448fc6b55a --- /dev/null +++ b/lib/libc/gen/ualarm.c @@ -0,0 +1,71 @@ +/* $NetBSD: ualarm.c,v 1.4 1995/02/25 15:39:33 cgd Exp $ */ + +/* + * 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) +#if 0 +static char sccsid[] = "@(#)ualarm.c 8.1 (Berkeley) 6/4/93"; +#else +static char rcsid[] = "$NetBSD: ualarm.c,v 1.4 1995/02/25 15:39:33 cgd Exp $"; +#endif +#endif /* LIBC_SCCS and not lint */ + +#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) + register unsigned usecs; + register 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); +} |