1 #include <time.h>
2 #include "syscall.h"
3
4 #ifndef __LITEOS__
5 #include <errno.h>
6 #include <stdint.h>
7 #include "atomic.h"
8
9 #ifdef VDSO_CGR_SYM
10
11 static void *volatile vdso_cgr;
12
cgr_init(clockid_t clk,struct timespec * ts)13 static int cgr_init(clockid_t clk, struct timespec *ts)
14 {
15 __get_vdso_info();
16 void *p = __get_vdso_addr(VDSO_CGR_VER, VDSO_CGR_SYM);
17 int (*f)(clockid_t, struct timespec *) =
18 (int (*)(clockid_t, struct timespec *))p;
19 a_cas_p(&vdso_cgr, (void *)cgr_init, p);
20 return f ? f(clk, ts) : -ENOSYS;
21 }
22
23 static void *volatile vdso_cgr = (void *)cgr_init;
24
25 #endif
26 #endif
27
clock_getres(clockid_t clk,struct timespec * ts)28 int clock_getres(clockid_t clk, struct timespec *ts)
29 {
30 int r;
31 #if defined(VDSO_CGR_SYM) && (!defined(__LITEOS__))
32 int (*f)(clockid_t, struct timespec *) =
33 (int (*)(clockid_t, struct timespec *))vdso_cgr;
34 if (f) {
35 r = f(clk, ts);
36 if (!r) return r;
37 if (r == -EINVAL) return __syscall_ret(r);
38 }
39 #endif
40
41 #ifdef SYS_clock_getres_time64
42 /* On a 32-bit arch, use the old syscall if it exists. */
43 if (SYS_clock_getres != SYS_clock_getres_time64) {
44 long ts32[2];
45 r = __syscall(SYS_clock_getres, clk, ts32);
46 if (!r && ts) {
47 ts->tv_sec = ts32[0];
48 ts->tv_nsec = ts32[1];
49 }
50 return __syscall_ret(r);
51 }
52 #endif
53 /* If reaching this point, it's a 64-bit arch or time64-only
54 * 32-bit arch and we can get result directly into timespec. */
55 return syscall(SYS_clock_getres, clk, ts);
56 }
57