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use weak aliase rather than weak reference for vdso clock_gettime

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this works around pcc's lack of working support for weak references,
and in principle is nice because it gets us back to the stage where
the only weak symbol feature we use is weak aliases, nothing else.

having fewer dependencies on fancy linker features is a good thing.
This commit is contained in:
Rich Felker 2011-08-07 15:48:16 -04:00
parent b3c08a16c0
commit cdfb725ca3
1 changed files with 12 additions and 8 deletions
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20
src/time/clock_gettime.c
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@ -4,17 +4,11 @@
#include "syscall.h"
#include "libc.h"
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)
static int sc_clock_gettime(clockid_t clk, struct timespec *ts)
{
int r;
if (cgt) return cgt(clk, ts);
r = __syscall(SYS_clock_gettime, clk, ts);
int 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;
@ -26,4 +20,14 @@ int __clock_gettime(clockid_t clk, struct timespec *ts)
return -1;
}
weak_alias(sc_clock_gettime, __vdso_clock_gettime);
int (*__cgt)(clockid_t, struct timespec *) = __vdso_clock_gettime;
int __clock_gettime(clockid_t clk, struct timespec *ts)
{
/* Conditional is to make this work prior to dynamic linking */
return __cgt ? __cgt(clk, ts) : sc_clock_gettime(clk, ts);
}
weak_alias(__clock_gettime, clock_gettime);