diff options
Diffstat (limited to 'src/time')
| -rw-r--r-- | src/time/clock_gettime.c | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/src/time/clock_gettime.c b/src/time/clock_gettime.c index 46083759..63e9f9c8 100644 --- a/src/time/clock_gettime.c +++ b/src/time/clock_gettime.c @@ -8,9 +8,41 @@ static void *volatile vdso_func; +#ifdef VDSO_CGT32_SYM +static void *volatile vdso_func_32; +static int cgt_time32_wrap(clockid_t clk, struct timespec *ts) +{ + long ts32[2]; + int (*f)(clockid_t, long[2]) = + (int (*)(clockid_t, long[2]))vdso_func_32; + int r = f(clk, ts32); + if (!r) { + /* Fallback to syscalls if time32 overflowed. Maybe + * we lucked out and somehow migrated to a kernel with + * time64 syscalls available. */ + if (ts32[0] < 0) { + a_cas_p(&vdso_func, (void *)cgt_time32_wrap, 0); + return -ENOSYS; + } + ts->tv_sec = ts32[0]; + ts->tv_nsec = ts32[1]; + } + return r; +} +#endif + static int cgt_init(clockid_t clk, struct timespec *ts) { void *p = __vdsosym(VDSO_CGT_VER, VDSO_CGT_SYM); +#ifdef VDSO_CGT32_SYM + if (!p) { + void *q = __vdsosym(VDSO_CGT32_VER, VDSO_CGT32_SYM); + if (q) { + a_cas_p(&vdso_func_32, 0, q); + p = cgt_time32_wrap; + } + } +#endif int (*f)(clockid_t, struct timespec *) = (int (*)(clockid_t, struct timespec *))p; a_cas_p(&vdso_func, (void *)cgt_init, p); |