workaround for gcc's optimizer breaking dynamic symbol resolution

[musl] / src / time / clock_gettime.c

diff --git a/src/time/clock_gettime.c b/src/time/clock_gettime.c
index dab09d5..9fef54a 100644 (file)
--- a/src/time/clock_gettime.c
+++ b/src/time/clock_gettime.c
@@ -1,7 +1,29 @@
 #include <time.h>
+#include <errno.h>
+#include <stdint.h>
 #include "syscall.h"
+#include "libc.h"
 
-int clock_gettime(clockid_t clk, struct timespec *ts)
+int __vdso_clock_gettime(clockid_t, struct timespec *) __attribute__((weak));
+static int (*cgt)(clockid_t, struct timespec *) = __vdso_clock_gettime;
+
+int __clock_gettime(clockid_t clk, struct timespec *ts)
 {
-       return syscall2(__NR_clock_gettime, clk, (long)ts);
+       int r;
+       if (cgt) return cgt(clk, ts);
+       r = __syscall(SYS_clock_gettime, clk, ts);
+       if (!r) return r;
+       if (r == -ENOSYS) {
+               cgt = 0;
+               if (clk == CLOCK_REALTIME) {
+                       __syscall(SYS_gettimeofday, clk, ts, 0);
+                       ts->tv_nsec = (int)ts->tv_nsec * 1000;
+                       return 0;
+               }
+               r = -EINVAL;
+       }
+       errno = -r;
+       return -1;
 }
+
+weak_alias(__clock_gettime, clock_gettime);