[英]How do i compile this code to work with LD_PRELOAD on linux?
如何编译以下代码使其可与LD_PRELOAD一起使用? 我设法用' gcc -m32 -shared code.c
'编译了没有错误的程序,但是当我打开试图将代码“注入”的程序时,它说:“ symbol lookup error: ./fps.so: undefined symbol: clock_gettime
'
#include<unistd.h>
#include<time.h>
#define BUSY_WAIT 3000
/* We use clock_gettime because it's better than gettimeofday */
unsigned long long int fetch_clock()
{
struct timespec ts;
clock_gettime(CLOCK_REALTIME, &ts);
return (unsigned long long int)ts.tv_nsec + 1000000*ts.tv_sec;
}
int high_pres_usleep_untill(unsigned long long int end)
{
unsigned long long int busywait, start;
int sleep, delay;
start = fetch_clock();
delay = end - start;
sleep = (delay / BUSY_WAIT) - 1;
if(sleep > 0)
if(usleep(sleep*BUSY_WAIT))
return -1;
while(fetch_clock() < end)
;
return 0;
}
您必须将共享库与librt链接起来才能使用clock_gettime。
gcc -m32 -shared code.c -lrt
请注意,您的fetch_clock函数已损坏。
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