3 files changed, 121 insertions, 0 deletions
diff --git a/kernel/tools/testing/selftests/kcmp/.gitignore b/kernel/tools/testing/selftests/kcmp/.gitignore
new file mode 100644
index 000000000..5a9b3732b
--- /dev/null
+++ b/kernel/tools/testing/selftests/kcmp/.gitignore
@@ -0,0 +1,2 @@
+kcmp_test
+kcmp-test-file
diff --git a/kernel/tools/testing/selftests/kcmp/Makefile b/kernel/tools/testing/selftests/kcmp/Makefile
new file mode 100644
index 000000000..2ae7450a9
--- /dev/null
+++ b/kernel/tools/testing/selftests/kcmp/Makefile
@@ -0,0 +1,10 @@
+CFLAGS += -I../../../../usr/include/
+
+all: kcmp_test
+
+TEST_PROGS := kcmp_test
+
+include ../lib.mk
+
+clean:
+	$(RM) kcmp_test kcmp-test-file
diff --git a/kernel/tools/testing/selftests/kcmp/kcmp_test.c b/kernel/tools/testing/selftests/kcmp/kcmp_test.c
new file mode 100644
index 000000000..a5a4da856
--- /dev/null
+++ b/kernel/tools/testing/selftests/kcmp/kcmp_test.c
@@ -0,0 +1,109 @@
+#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\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 (%s)\n",
+				ret, strerror(errno));
+			ksft_inc_fail_cnt();
+			ret = -1;
+		} else {
+			printf("PASS: 0 returned as expected\n");
+			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)\n",
+				ret, strerror(errno));
+			ksft_inc_fail_cnt();
+			ret = -1;
+		} else {
+			printf("PASS: 0 returned as expected\n");
+			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();
+}