This is an example about dummy syscall test in linux kernel
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| #include <sys/utsname.h>
#include <errno.h>
#include <time.h>
#include <sched.h>
#include <stdalign.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <syscall.h>
#include <signal.h>
#include <stdint.h>
#include <errno.h>
#include <string.h>
#include <sys/wait.h>
int main(void)
{
unsigned long i = 0;
int nr_mysyscall;
struct utsname buffer;
struct timespec tstart={0,0}, tend={0,0};
errno = 0;
if (uname(&buffer) != 0) {
perror("uname");
exit(EXIT_FAILURE);
}
if (buffer.release[0] == '5') {
printf("5.10 kernel\n");
clock_gettime(CLOCK_MONOTONIC, &tstart);
for (i=0; i<30000000; i++)
syscall(335);
clock_gettime(CLOCK_MONOTONIC, &tend);
printf("took about %.5f seconds\n",
((double)tend.tv_sec + 1.0e-9*tend.tv_nsec) -
((double)tstart.tv_sec + 1.0e-9*tstart.tv_nsec));
} else {
printf("4.19 kernel\n");
clock_gettime(CLOCK_MONOTONIC, &tstart);
for (i=0; i<30000000; i++)
syscall(438);
clock_gettime(CLOCK_MONOTONIC, &tend);
printf("took about %.5f seconds\n",
((double)tend.tv_sec + 1.0e-9*tend.tv_nsec) -
((double)tstart.tv_sec + 1.0e-9*tstart.tv_nsec));
}
return 0;
}
|