[398] | 1 | #include <time.h>
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| 2 | #include <errno.h>
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| 3 | #include <stdint.h>
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| 4 | #include "syscall.h"
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| 5 | #include "libc.h"
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| 6 | #include "atomic.h"
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| 7 |
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| 8 | #ifdef VDSO_CGT_SYM
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| 9 |
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| 10 | void *__vdsosym(const char *, const char *);
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| 11 |
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| 12 | static void *volatile vdso_func;
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| 13 |
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| 14 | static int cgt_init(clockid_t clk, struct timespec *ts)
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| 15 | {
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| 16 | void *p = __vdsosym(VDSO_CGT_VER, VDSO_CGT_SYM);
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| 17 | int (*f)(clockid_t, struct timespec *) =
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| 18 | (int (*)(clockid_t, struct timespec *))p;
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| 19 | a_cas_p(&vdso_func, (void *)cgt_init, p);
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| 20 | return f ? f(clk, ts) : -ENOSYS;
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| 21 | }
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| 22 |
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| 23 | static void *volatile vdso_func = (void *)cgt_init;
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| 24 |
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| 25 | #endif
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| 26 |
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| 27 | int __clock_gettime(clockid_t clk, struct timespec *ts)
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| 28 | {
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| 29 | int r;
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| 30 |
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| 31 | #ifdef VDSO_CGT_SYM
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| 32 | int (*f)(clockid_t, struct timespec *) =
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| 33 | (int (*)(clockid_t, struct timespec *))vdso_func;
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| 34 | if (f) {
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| 35 | r = f(clk, ts);
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| 36 | if (!r) return r;
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| 37 | if (r == -EINVAL) return __syscall_ret(r);
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| 38 | /* Fall through on errors other than EINVAL. Some buggy
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| 39 | * vdso implementations return ENOSYS for clocks they
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| 40 | * can't handle, rather than making the syscall. This
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| 41 | * also handles the case where cgt_init fails to find
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| 42 | * a vdso function to use. */
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| 43 | }
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| 44 | #endif
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| 45 |
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| 46 | r = __syscall(SYS_clock_gettime, clk, ts);
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| 47 | if (r == -ENOSYS) {
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| 48 | if (clk == CLOCK_REALTIME) {
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| 49 | __syscall(SYS_gettimeofday, ts, 0);
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| 50 | ts->tv_nsec = (int)ts->tv_nsec * 1000;
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| 51 | return 0;
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| 52 | }
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| 53 | r = -EINVAL;
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| 54 | }
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| 55 | return __syscall_ret(r);
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| 56 | }
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| 57 |
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| 58 | weak_alias(__clock_gettime, clock_gettime);
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