1*fae548d3Szrj /*
2*fae548d3Szrj * Copyright (c) 1983, 1993
3*fae548d3Szrj * The Regents of the University of California. All rights reserved.
4*fae548d3Szrj *
5*fae548d3Szrj * Redistribution and use in source and binary forms, with or without
6*fae548d3Szrj * modification, are permitted provided that the following conditions
7*fae548d3Szrj * are met:
8*fae548d3Szrj * 1. Redistributions of source code must retain the above copyright
9*fae548d3Szrj * notice, this list of conditions and the following disclaimer.
10*fae548d3Szrj * 2. Redistributions in binary form must reproduce the above copyright
11*fae548d3Szrj * notice, this list of conditions and the following disclaimer in the
12*fae548d3Szrj * documentation and/or other materials provided with the distribution.
13*fae548d3Szrj * 3. Neither the name of the University nor the names of its contributors
14*fae548d3Szrj * may be used to endorse or promote products derived from this software
15*fae548d3Szrj * without specific prior written permission.
16*fae548d3Szrj *
17*fae548d3Szrj * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18*fae548d3Szrj * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19*fae548d3Szrj * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20*fae548d3Szrj * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21*fae548d3Szrj * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22*fae548d3Szrj * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23*fae548d3Szrj * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24*fae548d3Szrj * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25*fae548d3Szrj * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26*fae548d3Szrj * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27*fae548d3Szrj * SUCH DAMAGE.
28*fae548d3Szrj */
29*fae548d3Szrj #include "gprof.h"
30*fae548d3Szrj #include "hertz.h"
31*fae548d3Szrj
32*fae548d3Szrj
33*fae548d3Szrj int
hertz(void)34*fae548d3Szrj hertz (void)
35*fae548d3Szrj {
36*fae548d3Szrj #ifdef HERTZ
37*fae548d3Szrj return HERTZ;
38*fae548d3Szrj #else /* ! defined (HERTZ) */
39*fae548d3Szrj #ifdef HAVE_SETITIMER
40*fae548d3Szrj struct itimerval tim;
41*fae548d3Szrj
42*fae548d3Szrj tim.it_interval.tv_sec = 0;
43*fae548d3Szrj tim.it_interval.tv_usec = 1;
44*fae548d3Szrj tim.it_value.tv_sec = 0;
45*fae548d3Szrj tim.it_value.tv_usec = 0;
46*fae548d3Szrj setitimer (ITIMER_REAL, &tim, 0);
47*fae548d3Szrj setitimer (ITIMER_REAL, 0, &tim);
48*fae548d3Szrj if (tim.it_interval.tv_usec >= 2)
49*fae548d3Szrj {
50*fae548d3Szrj return 1000000 / tim.it_interval.tv_usec;
51*fae548d3Szrj }
52*fae548d3Szrj #endif /* ! defined (HAVE_SETITIMER) */
53*fae548d3Szrj #if defined (HAVE_SYSCONF) && defined (_SC_CLK_TCK)
54*fae548d3Szrj return sysconf (_SC_CLK_TCK);
55*fae548d3Szrj #else /* ! defined (HAVE_SYSCONF) || ! defined (_SC_CLK_TCK) */
56*fae548d3Szrj #ifdef __MSDOS__
57*fae548d3Szrj return 18;
58*fae548d3Szrj #else /* ! defined (__MSDOS__) */
59*fae548d3Szrj return HZ_WRONG;
60*fae548d3Szrj #endif /* ! defined (__MSDOS__) */
61*fae548d3Szrj #endif /* ! defined (HAVE_SYSCONF) || ! defined (_SC_CLK_TCK) */
62*fae548d3Szrj #endif /* ! defined (HERTZ) */
63*fae548d3Szrj }
64