| Jari Aalto | 3185942 | 2009-01-12 13:36:28 +0000 | [diff] [blame] | 1 | /* ufuncs - sleep and alarm functions that understand fractional values */ |
| 2 | |
| 3 | /* Copyright (C) 2008,2009 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GNU Bash, the Bourne Again SHell. |
| 6 | |
| 7 | Bash is free software: you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as published by |
| 9 | the Free Software Foundation, either version 3 of the License, or |
| 10 | (at your option) any later version. |
| 11 | |
| 12 | Bash is distributed in the hope that it will be useful, |
| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public License |
| 18 | along with Bash. If not, see <http://www.gnu.org/licenses/>. |
| 19 | */ |
| 20 | |
| 21 | #include "config.h" |
| 22 | |
| 23 | #include "bashtypes.h" |
| 24 | |
| 25 | #if defined (TIME_WITH_SYS_TIME) |
| 26 | # include <sys/time.h> |
| 27 | # include <time.h> |
| 28 | #else |
| 29 | # if defined (HAVE_SYS_TIME_H) |
| 30 | # include <sys/time.h> |
| 31 | # else |
| 32 | # include <time.h> |
| 33 | # endif |
| 34 | #endif |
| 35 | |
| 36 | #if defined (HAVE_UNISTD_H) |
| 37 | #include <unistd.h> |
| 38 | #endif |
| 39 | |
| 40 | /* A version of `alarm' using setitimer if it's available. */ |
| 41 | |
| 42 | #if defined (HAVE_SETITIMER) |
| 43 | unsigned int |
| 44 | falarm(secs, usecs) |
| 45 | unsigned int secs, usecs; |
| 46 | { |
| 47 | struct itimerval it, oit; |
| 48 | |
| 49 | it.it_interval.tv_sec = 0; |
| 50 | it.it_interval.tv_usec = 0; |
| 51 | |
| 52 | it.it_value.tv_sec = secs; |
| 53 | it.it_value.tv_usec = usecs; |
| 54 | |
| 55 | if (setitimer(ITIMER_REAL, &it, &oit) < 0) |
| 56 | return (-1); /* XXX will be converted to unsigned */ |
| 57 | |
| 58 | /* Backwards compatibility with alarm(3) */ |
| 59 | if (oit.it_value.tv_usec) |
| 60 | oit.it_value.tv_sec++; |
| 61 | return (oit.it_value.tv_sec); |
| 62 | } |
| 63 | #else |
| 64 | int |
| 65 | falarm (secs, usecs) |
| 66 | unsigned int secs, usecs; |
| 67 | { |
| 68 | if (secs == 0 && usecs == 0) |
| 69 | return (alarm (0)); |
| 70 | |
| 71 | if (secs == 0 || usecs >= 500000) |
| 72 | { |
| 73 | secs++; |
| 74 | usecs = 0; |
| 75 | } |
| 76 | return (alarm (secs)); |
| 77 | } |
| 78 | #endif /* !HAVE_SETITIMER */ |
| 79 | |
| 80 | /* A version of sleep using fractional seconds and select. I'd like to use |
| 81 | `usleep', but it's already taken */ |
| 82 | |
| 83 | #if defined (HAVE_TIMEVAL) && defined (HAVE_SELECT) |
| 84 | int |
| 85 | fsleep(sec, usec) |
| 86 | unsigned int sec, usec; |
| 87 | { |
| 88 | struct timeval tv; |
| 89 | |
| 90 | tv.tv_sec = sec; |
| 91 | tv.tv_usec = usec; |
| 92 | |
| 93 | return select(0, (fd_set *)0, (fd_set *)0, (fd_set *)0, &tv); |
| 94 | } |
| 95 | #else /* !HAVE_TIMEVAL || !HAVE_SELECT */ |
| 96 | int |
| 97 | fsleep(sec, usec) |
| 98 | long sec, usec; |
| 99 | { |
| 100 | if (usec >= 500000) /* round */ |
| 101 | sec++; |
| 102 | return (sleep(sec)); |
| 103 | } |
| 104 | #endif /* !HAVE_TIMEVAL || !HAVE_SELECT */ |