projects / deliverable / binutils-gdb.git / blame
| Commit | Line | Data |
|---|---|---|
| 252b5132 RH |
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 "hertz.h" | |
| 20 | ||
| 21 | ||
| 22 | #ifdef __MSDOS__ | |
| 23 | #define HERTZ 18 | |
| 24 | #endif | |
| 25 | ||
| 26 | int | |
| 27 | hertz () | |
| 28 | { | |
| 29 | #ifdef HERTZ | |
| 30 | return HERTZ; | |
| 31 | #else /* ! defined (HERTZ) */ | |
| 32 | #ifdef HAVE_SETITIMER | |
| 33 | struct itimerval tim; | |
| 34 | ||
| 35 | tim.it_interval.tv_sec = 0; | |
| 36 | tim.it_interval.tv_usec = 1; | |
| 37 | tim.it_value.tv_sec = 0; | |
| 38 | tim.it_value.tv_usec = 0; | |
| 39 | setitimer (ITIMER_REAL, &tim, 0); | |
| 40 | setitimer (ITIMER_REAL, 0, &tim); | |
| 41 | if (tim.it_interval.tv_usec < 2) | |
| 42 | { | |
| 43 | return HZ_WRONG; | |
| 44 | } | |
| 45 | return 1000000 / tim.it_interval.tv_usec; | |
| 46 | #else /* ! defined (HAVE_SETITIMER) */ | |
| 47 | #if defined (HAVE_SYSCONF) && defined (_SC_CLK_TCK) | |
| 48 | return sysconf (_SC_CLK_TCK); | |
| 49 | #else /* ! defined (HAVE_SYSCONF) || ! defined (_SC_CLK_TCK) */ | |
| 50 | return HZ_WRONG; | |
| 51 | #endif /* ! defined (HAVE_SYSCONF) || ! defined (_SC_CLK_TCK) */ | |
| 52 | #endif /* ! defined (HAVE_SETITIMER) */ | |
| 53 | #endif /* ! defined (HERTZ) */ | |
| 54 | } |