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kernel add
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#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <limits.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <linux/unistd.h>
#include <linux/kcmp.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include "../kselftest.h"
static long sys_kcmp(int pid1, int pid2, int type, int fd1, int fd2)
{
return syscall(__NR_kcmp, pid1, pid2, type, fd1, fd2);
}
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");
ksft_exit_fail();
}
pid2 = fork();
if (pid2 < 0) {
perror("fork failed");
ksft_exit_fail();
}
if (!pid2) {
int pid2 = getpid();
int ret;
fd2 = open(kpath, O_RDWR, 0644);
if (fd2 < 0) {
perror("Can't open file");
ksft_exit_fail();
}
/* 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
",
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 (%s)
",
ret, strerror(errno));
ksft_inc_fail_cnt();
ret = -1;
} else {
printf("PASS: 0 returned as expected
");
ksft_inc_pass_cnt();
}
/* Compare with self */
ret = sys_kcmp(pid1, pid1, KCMP_VM, 0, 0);
if (ret) {
printf("FAIL: 0 expected but %d returned (%s)
",
ret, strerror(errno));
ksft_inc_fail_cnt();
ret = -1;
} else {
printf("PASS: 0 returned as expected
");
ksft_inc_pass_cnt();
}
ksft_print_cnts();
if (ret)
ksft_exit_fail();
else
ksft_exit_pass();
}
waitpid(pid2, &status, P_ALL);
return ksft_exit_pass();
}
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