| 1 | /* |
| 2 | * Copyright (c) 1983 Regents of the University of California. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms are permitted |
| 6 | * provided that: (1) source distributions retain this entire copyright |
| 7 | * notice and comment, and (2) distributions including binaries display |
| 8 | * the following acknowledgement: ``This product includes software |
| 9 | * developed by the University of California, Berkeley and its contributors'' |
| 10 | * in the documentation or other materials provided with the distribution |
| 11 | * and in all advertising materials mentioning features or use of this |
| 12 | * software. Neither the name of the University nor the names of its |
| 13 | * contributors may be used to endorse or promote products derived |
| 14 | * from this software without specific prior written permission. |
| 15 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR |
| 16 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED |
| 17 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. |
| 18 | */ |
| 19 | #include "gprof.h" |
| 20 | #include "hertz.h" |
| 21 | |
| 22 | |
| 23 | int |
| 24 | hertz () |
| 25 | { |
| 26 | #ifdef HERTZ |
| 27 | return HERTZ; |
| 28 | #else /* ! defined (HERTZ) */ |
| 29 | #ifdef HAVE_SETITIMER |
| 30 | struct itimerval tim; |
| 31 | |
| 32 | tim.it_interval.tv_sec = 0; |
| 33 | tim.it_interval.tv_usec = 1; |
| 34 | tim.it_value.tv_sec = 0; |
| 35 | tim.it_value.tv_usec = 0; |
| 36 | setitimer (ITIMER_REAL, &tim, 0); |
| 37 | setitimer (ITIMER_REAL, 0, &tim); |
| 38 | if (tim.it_interval.tv_usec >= 2) |
| 39 | { |
| 40 | return 1000000 / tim.it_interval.tv_usec; |
| 41 | } |
| 42 | #endif /* ! defined (HAVE_SETITIMER) */ |
| 43 | #if defined (HAVE_SYSCONF) && defined (_SC_CLK_TCK) |
| 44 | return sysconf (_SC_CLK_TCK); |
| 45 | #else /* ! defined (HAVE_SYSCONF) || ! defined (_SC_CLK_TCK) */ |
| 46 | #ifdef __MSDOS__ |
| 47 | return 18; |
| 48 | #else /* ! defined (__MSDOS__) */ |
| 49 | return HZ_WRONG; |
| 50 | #endif /* ! defined (__MSDOS__) */ |
| 51 | #endif /* ! defined (HAVE_SYSCONF) || ! defined (_SC_CLK_TCK) */ |
| 52 | #endif /* ! defined (HERTZ) */ |
| 53 | } |