diff options
author | Rich Felker <dalias@aerifal.cx> | 2019-07-28 22:53:10 -0400 |
---|---|---|
committer | Rich Felker <dalias@aerifal.cx> | 2019-07-29 12:31:02 -0400 |
commit | 244858553e7eaacd135de5c1cdb49489796b6d02 (patch) | |
tree | 1a0c5c9025086c02c9bfaa75416a1954f4549cf4 /src | |
parent | a02bd52864a21b46206eaf67e1e7fb53834b594a (diff) | |
download | musl-244858553e7eaacd135de5c1cdb49489796b6d02.tar.gz |
clock_getres: don't assume time_t is 32-bit on 32-bit archs
the time64 syscall for this is not necessary or useful, since clock
resolution is generally better than 68-year granularity. if there's a
32-bit syscall, use it and expand the result into timespec; otherwise
there is only one syscall and it does the right thing to store to
timespec directly.
on 64-bit archs, there is no change to the code after preprocessing.
Diffstat (limited to 'src')
-rw-r--r-- | src/time/clock_getres.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/src/time/clock_getres.c b/src/time/clock_getres.c index 36a0d695..f0f41cf9 100644 --- a/src/time/clock_getres.c +++ b/src/time/clock_getres.c @@ -3,5 +3,19 @@ int clock_getres(clockid_t clk, struct timespec *ts) { +#ifdef SYS_clock_getres_time64 + /* On a 32-bit arch, use the old syscall if it exists. */ + if (SYS_clock_getres != SYS_clock_getres_time64) { + long ts32[2]; + int r = __syscall(SYS_clock_getres, clk, ts32); + if (!r) { + ts->tv_sec = ts32[0]; + ts->tv_nsec = ts32[1]; + } + return __syscall_ret(r); + } +#endif + /* If reaching this point, it's a 64-bit arch or time64-only + * 32-bit arch and we can get result directly into timespec. */ return syscall(SYS_clock_getres, clk, ts); } |