static int check_kcmp(void)
{
int ret = sys_kcmp(getpid(), -1, -1, -1, -1);
if (ret != -ENOSYS)
return 0;
pr_msg("System call kcmp is not supported\n");
return -1;
}
static int check_kcmp(void)
{
int ret = sys_kcmp(getpid(), -1, -1, -1, -1);
if (ret != -ENOSYS)
return 0;
errno = -ret;
pr_perror("System call kcmp is not supported");
return -1;
}
int main(int argc, char **argv)
{
const char kpath[] = "kcmp-test-file";
int pid1, pid2;
int fd1, fd2;
int status;
fd1 = open(kpath, O_RDWR | O_CREAT | O_TRUNC, 0644);
pid1 = getpid();
if (fd1 < 0) {
perror("Can't create file");
exit(1);
}
pid2 = fork();
if (pid2 < 0) {
perror("fork failed");
exit(1);
}
if (!pid2) {
int pid2 = getpid();
int ret;
fd2 = open(kpath, O_RDWR, 0644);
if (fd2 < 0) {
perror("Can't open file");
exit(1);
}
/* An example of output and arguments */
printf("pid1: %6d pid2: %6d FD: %2ld FILES: %2ld VM: %2ld "
"FS: %2ld SIGHAND: %2ld IO: %2ld SYSVSEM: %2ld "
"INV: %2ld\n",
pid1, pid2,
sys_kcmp(pid1, pid2, KCMP_FILE, fd1, fd2),
sys_kcmp(pid1, pid2, KCMP_FILES, 0, 0),
sys_kcmp(pid1, pid2, KCMP_VM, 0, 0),
sys_kcmp(pid1, pid2, KCMP_FS, 0, 0),
sys_kcmp(pid1, pid2, KCMP_SIGHAND, 0, 0),
sys_kcmp(pid1, pid2, KCMP_IO, 0, 0),
sys_kcmp(pid1, pid2, KCMP_SYSVSEM, 0, 0),
/* This one should fail */
sys_kcmp(pid1, pid2, KCMP_TYPES + 1, 0, 0));
/* This one should return same fd */
ret = sys_kcmp(pid1, pid2, KCMP_FILE, fd1, fd1);
if (ret) {
printf("FAIL: 0 expected but %d returned\n", ret);
ret = -1;
} else
printf("PASS: 0 returned as expected\n");
/* Compare with self */
ret = sys_kcmp(pid1, pid1, KCMP_VM, 0, 0);
if (ret) {
printf("FAIL: 0 expected but %li returned\n", ret);
ret = -1;
} else
printf("PASS: 0 returned as expected\n");
exit(ret);
}
waitpid(pid2, &status, P_ALL);
return 0;
}
