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#include <time.h>
#include "syscall.h"
int clock_getres(clockid_t clk, struct timespec *ts)
{
#ifdef __EMSCRIPTEN__
// See https://github.com/bytecodealliance/wasmtime/issues/374
if (clk > __WASI_CLOCKID_THREAD_CPUTIME_ID || clk < 0) {
errno = EINVAL;
return -1;
}
__wasi_timestamp_t res;
__wasi_errno_t error = __wasi_clock_res_get(clk, &res);
if (error != __WASI_ERRNO_SUCCESS) {
return __wasi_syscall_ret(error);
}
*ts = __wasi_timestamp_to_timespec(res);
return 0;
#else
#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) {
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);
#endif
}
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