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time: time_t is signed, and mktime() is happy to return negative time

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Passing a year such as 1960 to mktime() will result in a negative return
value. This is quite confusing, as the man page claims that on failure
the call will return -1...

Given that our own usec_t type is unsigned, and we can't express times
before 1970 hence, let's consider all negative times returned by
mktime() as invalid, regardless if just -1, or anything else negative.
This commit is contained in:
Lennart Poettering
2017-02-02 20:12:31 +01:00
parent ced58da749
commit c477ff141b
2 changed files with 8 additions and 9 deletions
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src/basic/time-util.c
+4 -5
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@@ -185,7 +185,7 @@ usec_t triple_timestamp_by_clock(triple_timestamp *ts, clockid_t clock) {
usec_t timespec_load(const struct timespec *ts) {
assert(ts);
if (ts->tv_sec == (time_t) -1 && ts->tv_nsec == (long) -1)
if (ts->tv_sec < 0 || ts->tv_nsec < 0)
return USEC_INFINITY;
if ((usec_t) ts->tv_sec > (UINT64_MAX - (ts->tv_nsec / NSEC_PER_USEC)) / USEC_PER_SEC)
@@ -199,7 +199,7 @@ usec_t timespec_load(const struct timespec *ts) {
nsec_t timespec_load_nsec(const struct timespec *ts) {
assert(ts);
if (ts->tv_sec == (time_t) -1 && ts->tv_nsec == (long) -1)
if (ts->tv_sec < 0 || ts->tv_nsec < 0)
return NSEC_INFINITY;
if ((nsec_t) ts->tv_sec >= (UINT64_MAX - ts->tv_nsec) / NSEC_PER_SEC)
@@ -226,8 +226,7 @@ struct timespec *timespec_store(struct timespec *ts, usec_t u) {
usec_t timeval_load(const struct timeval *tv) {
assert(tv);
if (tv->tv_sec == (time_t) -1 &&
tv->tv_usec == (suseconds_t) -1)
if (tv->tv_sec < 0 || tv->tv_usec < 0)
return USEC_INFINITY;
if ((usec_t) tv->tv_sec > (UINT64_MAX - tv->tv_usec) / USEC_PER_SEC)
@@ -830,7 +829,7 @@ parse_usec:
from_tm:
x = mktime_or_timegm(&tm, utc);
if (x == (time_t) -1)
if (x < 0)
return -EINVAL;
if (weekday >= 0 && tm.tm_wday != weekday)