2bf1cbf1c6
I was curious why sys_kcmp wasn't working, which led me to the testcase. It turned out I hadn't enabled CHECKPOINT_RESTORE in the kernel I was testing. Add a decoding of errno to the testcase to make that obvious. Signed-off-by: Dave Jones <davej@redhat.com> Acked-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
96 lines
2.1 KiB
C
96 lines
2.1 KiB
C
#define _GNU_SOURCE
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#include <stdio.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <limits.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <fcntl.h>
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#include <linux/unistd.h>
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#include <linux/kcmp.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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static long sys_kcmp(int pid1, int pid2, int type, int fd1, int fd2)
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{
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return syscall(__NR_kcmp, pid1, pid2, type, fd1, fd2);
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}
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int main(int argc, char **argv)
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{
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const char kpath[] = "kcmp-test-file";
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int pid1, pid2;
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int fd1, fd2;
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int status;
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fd1 = open(kpath, O_RDWR | O_CREAT | O_TRUNC, 0644);
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pid1 = getpid();
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if (fd1 < 0) {
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perror("Can't create file");
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exit(1);
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}
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pid2 = fork();
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if (pid2 < 0) {
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perror("fork failed");
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exit(1);
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}
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if (!pid2) {
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int pid2 = getpid();
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int ret;
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fd2 = open(kpath, O_RDWR, 0644);
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if (fd2 < 0) {
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perror("Can't open file");
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exit(1);
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}
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/* An example of output and arguments */
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printf("pid1: %6d pid2: %6d FD: %2ld FILES: %2ld VM: %2ld "
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"FS: %2ld SIGHAND: %2ld IO: %2ld SYSVSEM: %2ld "
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"INV: %2ld\n",
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pid1, pid2,
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sys_kcmp(pid1, pid2, KCMP_FILE, fd1, fd2),
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sys_kcmp(pid1, pid2, KCMP_FILES, 0, 0),
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sys_kcmp(pid1, pid2, KCMP_VM, 0, 0),
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sys_kcmp(pid1, pid2, KCMP_FS, 0, 0),
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sys_kcmp(pid1, pid2, KCMP_SIGHAND, 0, 0),
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sys_kcmp(pid1, pid2, KCMP_IO, 0, 0),
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sys_kcmp(pid1, pid2, KCMP_SYSVSEM, 0, 0),
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/* This one should fail */
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sys_kcmp(pid1, pid2, KCMP_TYPES + 1, 0, 0));
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/* This one should return same fd */
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ret = sys_kcmp(pid1, pid2, KCMP_FILE, fd1, fd1);
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if (ret) {
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printf("FAIL: 0 expected but %d returned (%s)\n",
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ret, strerror(errno));
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ret = -1;
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} else
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printf("PASS: 0 returned as expected\n");
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/* Compare with self */
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ret = sys_kcmp(pid1, pid1, KCMP_VM, 0, 0);
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if (ret) {
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printf("FAIL: 0 expected but %li returned (%s)\n",
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ret, strerror(errno));
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ret = -1;
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} else
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printf("PASS: 0 returned as expected\n");
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exit(ret);
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}
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waitpid(pid2, &status, P_ALL);
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return 0;
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}
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