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Makefile
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Makefile.depend
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arcs.c
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dfn.c
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elf.c
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gprof.1
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gprof.c
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gprof.callg
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gprof.flat
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gprof.h
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hertz.c
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kernel.c
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lookup.c
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pathnames.h
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printgprof.c
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printlist.c
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Editing: hertz.c
/*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 1983, 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. 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 0 #ifndef lint static char sccsid[] = "@(#)hertz.c 8.1 (Berkeley) 6/6/93"; #endif /* not lint */ #endif #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); #include <sys/time.h> /* * discover the tick frequency of the machine * if something goes wrong, we return 0, an impossible hertz. */ #define HZ_WRONG 0 int hertz(void); int hertz(void) { struct itimerval tim; tim.it_interval.tv_sec = 0; tim.it_interval.tv_usec = 1; tim.it_value.tv_sec = 0; tim.it_value.tv_usec = 0; setitimer(ITIMER_REAL, &tim, 0); setitimer(ITIMER_REAL, 0, &tim); if (tim.it_interval.tv_usec < 2) return(HZ_WRONG); return (1000000 / tim.it_interval.tv_usec); }
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