1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* Test that empty argvs are swapped out for a single empty string. */ |
3 | #include <stdio.h> |
4 | #include <unistd.h> |
5 | #include <sys/types.h> |
6 | #include <sys/wait.h> |
7 | |
8 | #include "../kselftest.h" |
9 | |
10 | #define FORK(exec) \ |
11 | do { \ |
12 | pid = fork(); \ |
13 | if (pid == 0) { \ |
14 | /* Child */ \ |
15 | exec; /* Some kind of exec */ \ |
16 | perror("# " #exec); \ |
17 | return 1; \ |
18 | } \ |
19 | check_result(pid, #exec); \ |
20 | } while (0) |
21 | |
22 | void check_result(pid_t pid, const char *msg) |
23 | { |
24 | int wstatus; |
25 | |
26 | if (pid == (pid_t)-1) { |
27 | perror("# fork" ); |
28 | ksft_test_result_fail(msg: "fork failed: %s\n" , msg); |
29 | return; |
30 | } |
31 | if (waitpid(pid, &wstatus, 0) < 0) { |
32 | perror("# waitpid" ); |
33 | ksft_test_result_fail(msg: "waitpid failed: %s\n" , msg); |
34 | return; |
35 | } |
36 | if (!WIFEXITED(wstatus)) { |
37 | ksft_test_result_fail(msg: "child did not exit: %s\n" , msg); |
38 | return; |
39 | } |
40 | if (WEXITSTATUS(wstatus) != 0) { |
41 | ksft_test_result_fail(msg: "non-zero exit: %s\n" , msg); |
42 | return; |
43 | } |
44 | ksft_test_result_pass(msg: "%s\n" , msg); |
45 | } |
46 | |
47 | int main(int argc, char *argv[], char *envp[]) |
48 | { |
49 | pid_t pid; |
50 | static char * const args[] = { NULL }; |
51 | static char * const str[] = { "" , NULL }; |
52 | |
53 | /* argc counting checks */ |
54 | if (argc < 1) { |
55 | fprintf(stderr, "# FAIL: saw argc == 0 (old kernel?)\n" ); |
56 | return 1; |
57 | } |
58 | if (argc != 1) { |
59 | fprintf(stderr, "# FAIL: unknown argc (%d)\n" , argc); |
60 | return 1; |
61 | } |
62 | if (argv[0][0] == '\0') { |
63 | /* Good, we found a NULL terminated string at argv[0]! */ |
64 | return 0; |
65 | } |
66 | |
67 | /* Test runner. */ |
68 | ksft_print_header(); |
69 | ksft_set_plan(plan: 5); |
70 | |
71 | FORK(execve(argv[0], str, NULL)); |
72 | FORK(execve(argv[0], NULL, NULL)); |
73 | FORK(execve(argv[0], NULL, envp)); |
74 | FORK(execve(argv[0], args, NULL)); |
75 | FORK(execve(argv[0], args, envp)); |
76 | |
77 | ksft_exit(ksft_cnt.ksft_pass == ksft_plan); |
78 | } |
79 | |