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| author | Denys Vlasenko | 2010-01-25 19:30:16 +0100 |
|---|---|---|
| committer | Denys Vlasenko | 2010-01-25 19:30:16 +0100 |
| commit | 24928ffd8d6eb7f410ea0a7b4530086cecfeea6e (patch) | |
| tree | fa0c4b0cdcebb2c4a9f8d5aefcd42fcafcbb89da /networking | |
| parent | 3581c625151d25d8e1cbc80c44337d398d97cf42 (diff) | |
| download | busybox-24928ffd8d6eb7f410ea0a7b4530086cecfeea6e.zip busybox-24928ffd8d6eb7f410ea0a7b4530086cecfeea6e.tar.gz | |
ntpd: explain why scripts can be run in quick succession
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'networking')
| -rw-r--r-- | networking/ntpd.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/networking/ntpd.c b/networking/ntpd.c index 95dfdb1..04df3fa 100644 --- a/networking/ntpd.c +++ b/networking/ntpd.c @@ -735,6 +735,13 @@ send_query_to_peer(peer_t *p) } +/* Note that there is no provision to prevent several run_scripts + * to be done in quick succession. In fact, it happens rather often + * if initial syncronization results in a step. + * You will see "step" and then "stratum" script runs, sometimes + * as close as only 0.002 seconds apart. + * Script should be ready to deal with this. + */ static void run_script(const char *action, double offset) { char *argv[3]; @@ -1185,8 +1192,8 @@ update_local_clock(peer_t *p) abs_offset = fabs(offset); #if 0 - /* If needed, -S script can detect this by looking at $offset - * env var and kill parent */ + /* If needed, -S script can do it by looking at $offset + * env var and killing parent */ /* If the offset is too large, give up and go home */ if (abs_offset > PANIC_THRESHOLD) { bb_error_msg_and_die("offset %f far too big, exiting", offset); @@ -2007,7 +2014,7 @@ int ntpd_main(int argc UNUSED_PARAM, char **argv) nfds = poll(pfd, i, timeout * 1000); gettime1900d(); /* sets G.cur_time */ if (nfds <= 0) { - if (G.cur_time - G.last_script_run > 11*60) { + if (G.script_name && G.cur_time - G.last_script_run > 11*60) { /* Useful for updating battery-backed RTC and such */ run_script("periodic", G.last_update_offset); gettime1900d(); /* sets G.cur_time */ |