diff options
| -rw-r--r-- | src/timer_gettimeofday.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/src/timer_gettimeofday.c b/src/timer_gettimeofday.c index 1bf714eb..42988053 100644 --- a/src/timer_gettimeofday.c +++ b/src/timer_gettimeofday.c @@ -33,7 +33,13 @@ struct timeval osmo_gettimeofday_override_time = { 23, 424242 }; /*! shim around gettimeofday to be able to set the time manually. * To override, set osmo_gettimeofday_override == true and set the desired - * current time in osmo_gettimeofday_override_time. */ + * current time in osmo_gettimeofday_override_time. + * + * N. B: gettimeofday() is affected by discontinuous jumps in the system time + * (e.g., if the system administrator manually changes the system time). + * Hence this should NEVER be used for elapsed time computation. + * Instead, clock_gettime(CLOCK_MONOTONIC, ..) should be used for that (with similar shim if necessary). + */ int osmo_gettimeofday(struct timeval *tv, struct timezone *tz) { if (osmo_gettimeofday_override) { |