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jiffies wrap around safety

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This commit is contained in:
Axel Kittenberger 2010-05-24 12:32:34 +00:00
parent 58813b527f
commit 731f581d70
1 changed files with 19 additions and 1 deletions
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20
lsyncd.c
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@ -41,6 +41,19 @@
#define INOTIFY_BUF_LEN (512 * (sizeof(struct inotify_event) + 16))
/**
* Macros to compare times() values
* (borrowed from linux/jiffies.h)
*
* time_after(a,b) returns true if the time a is after time b.
*/
#define time_after(a,b) ((long)(b) - (long)(a) < 0)
#define time_before(a,b) time_after(b,a)
#define time_after_eq(a,b) ((long)(a) - (long)(b) >= 0)
#define time_before_eq(a,b) time_after_eq(b,a)
enum log_code {
DEBUG = 1,
NORMAL = 2,
@ -1398,6 +1411,11 @@ bool master_loop()
now = times(NULL);
tv.tv_sec = (alarm - now) / clocks_per_sec;
tv.tv_usec = (alarm - now) * 1000000 / clocks_per_sec % 1000000;
if (tv.tv_sec > delay) {
// security boundary in case of times() wrap around.
tv.tv_sec = delay;
tv.tv_usec = 0;
}
ready = select(inotf + 1, &readfds, NULL, NULL, &tv);
} else {
// if nothing to wait for, enter a blocking read
@ -1428,7 +1446,7 @@ bool master_loop()
i += sizeof(struct inotify_event) + event->len;
}
while (tackle_num > 0 && dir_watches[tackles[0]].alarm <= times(NULL)) {
while (tackle_num > 0 && time_after(times(NULL), dir_watches[tackles[0]].alarm)) {
printlogf(DEBUG, "time for %d arrived.", tackles[0]);
rsync_dir(tackles[0]);
remove_first_tackle();