79 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/* 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) \11do { \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 22void 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("fork failed: %s\n", msg);29 return;30 }31 if (waitpid(pid, &wstatus, 0) < 0) {32 perror("# waitpid");33 ksft_test_result_fail("waitpid failed: %s\n", msg);34 return;35 }36 if (!WIFEXITED(wstatus)) {37 ksft_test_result_fail("child did not exit: %s\n", msg);38 return;39 }40 if (WEXITSTATUS(wstatus) != 0) {41 ksft_test_result_fail("non-zero exit: %s\n", msg);42 return;43 }44 ksft_test_result_pass("%s\n", msg);45}46 47int 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(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