On 6/30/24 13:22, Abdulrasaq Lawani wrote:

Noticed that there was no selftest for the acct() syscall which enables the kernel to record terminated processes into a specified file.

The acct() system call enables or disables process accounting. If accounting is turned on, records for each terminating process are appended to a specified filename as it terminates. An argument of NULL causes accounting to be turned off.

This patch provides a test for the acct() syscall.

References: https://man7.org/linux/man-pages/man2/acct.2.html

Signed-off-by: Abdulrasaq Lawani abdulrasaqolawani@gmail.com

What does the test output look like?

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Changes in v2: Add testcases to test error conditions. Add kselftest function for reporting results.

• Link to v1: https://lore.kernel.org/r/20240622-kselftest-acct-syscall-v1-1-d270b5be8d37@...

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tools/testing/selftests/Makefile | 1 + tools/testing/selftests/acct/.gitignore | 2 + tools/testing/selftests/acct/Makefile | 4 ++ tools/testing/selftests/acct/acct_syscall.c | 89 +++++++++++++++++++++++++++++ 4 files changed, 96 insertions(+)

diff --git a/tools/testing/selftests/Makefile b/tools/testing/selftests/Makefile index 9039f3709aff..45a58ef5ad92 100644 --- a/tools/testing/selftests/Makefile +++ b/tools/testing/selftests/Makefile @@ -1,4 +1,5 @@ # SPDX-License-Identifier: GPL-2.0 +TARGETS += acct TARGETS += alsa TARGETS += amd-pstate TARGETS += arm64 diff --git a/tools/testing/selftests/acct/.gitignore b/tools/testing/selftests/acct/.gitignore new file mode 100644 index 000000000000..8ab358d81bd2 --- /dev/null +++ b/tools/testing/selftests/acct/.gitignore @@ -0,0 +1,2 @@ +acct_syscall +config \ No newline at end of file

What is this?

diff --git a/tools/testing/selftests/acct/Makefile b/tools/testing/selftests/acct/Makefile new file mode 100644 index 000000000000..ff3e238c5634 --- /dev/null +++ b/tools/testing/selftests/acct/Makefile @@ -0,0 +1,4 @@ +TEST_GEN_PROGS := acct_syscall +CFLAGS += -Wall

+include ../lib.mk \ No newline at end of file diff --git a/tools/testing/selftests/acct/acct_syscall.c b/tools/testing/selftests/acct/acct_syscall.c new file mode 100644 index 000000000000..4fa00a88a1bd --- /dev/null +++ b/tools/testing/selftests/acct/acct_syscall.c @@ -0,0 +1,89 @@ +// SPDX-License-Identifier: GPL-2.0

+/* kselftest for acct() system call

• • The acct() system call enables or disables process accounting.
• */

+#include <stdio.h> +#include <errno.h> +#include <string.h> +#include <sys/wait.h>

+#include "../kselftest.h"

+int main(void) +{

• // Setting up kselftest framework
• ksft_print_header();
• ksft_set_plan(1);
• // Create file to log closed processes
• char filename[] = "process_log";

Where does this file created?

• FILE *fp;
• fp = fopen(filename, "w");

What happens if file creation fails?

• int i = acct(filename);

Chose a descriptive name for the variable e.g: ret

• // Handle error conditions
• if (i) {

Is this the failure case - ret < 0 case - complete conditional.

• switch (errno) {
  

• case EPERM:
  

• 	ksft_test_result_error("%s. Please run the test as root.\n",
  

• 		strerror(errno));
  

• 	break;
  

• case EACCES:
  

• 	ksft_test_result_error("Insufficient privilege.\n");
  

• 	break;
  

• case EIO:
  

• 	ksft_test_result_error("Error writing to the file: %s.\n", filename);
  

• 	break;
  

• default:
  

• 	ksft_test_result_error("%s.\n", strerror(errno));
  

• 	break;
  

• }
  

• remove(filename);
  

• fclose(fp);
  

• ksft_finished();
  

• return 1;
  

• }
• // Create child process and wait for it to terminate.
• pid_t child_pid;
• child_pid = fork();
• if (child_pid < 0) {

• ksft_test_result_error("Process failed\n");
  

• ksft_finished();
  

• return 1;
  

• } else if (child_pid == 0) {

• ksft_print_msg("Child process successfully created!\n");
  

You don't need braces here since it it a single statement after the conditional.

• } else {

• wait(NULL);
  

• fseek(fp, 0L, SEEK_END);
  

• int sz = ftell(fp);
  

• ksft_print_msg("Parent process successfully created!\n");
  

• i = acct(NULL);
  

• if (sz <= 0) {
  

• 	ksft_test_result_fail("Terminated child process not logged");
  

• 	ksft_exit_fail();
  

• 	return 1;
  

• }
  

• ksft_test_result_pass("Successfully logged terminated process.\n");
  

• remove(filename);
  

• fclose(fp);
  

• ksft_exit_pass();
  

• return 0;
  

• }
• return 1;

+}

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base-commit: 50736169ecc8387247fe6a00932852ce7b057083 change-id: 20240622-kselftest-acct-syscall-2d90f7666b1e

Best regards,

Please check coding guidelines and ruun checkpatch on this.