Enrico Fraccaroli
65 lines
2.0 KiB
C
65 lines
2.0 KiB
C
/// @file t_exec.c
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/// @brief
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/// @copyright (c) 2014-2022 This file is distributed under the MIT License.
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/// See LICENSE.md for details.
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/unistd.h>
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#include <sys/wait.h>
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#include <string.h>
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static inline void __print_usage(int argc, char *argv[])
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{
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if (argc > 0) {
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printf("%s: Usage: %s <exec_type>\n", argv[0], argv[0]);
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printf("exec_type: execl, execlp, execle, execlpe, execv, execvp, execve, execvpe\n");
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}
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}
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int main(int argc, char *argv[])
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{
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int status;
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if (argc != 2) {
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__print_usage(argc, argv);
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return 1;
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}
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if (setenv("ENV_VAR", "pwd0", 0) == -1) {
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printf("Failed to set env: `ENV_VAR`\n");
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return 1;
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}
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char *file = "echo";
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char *path = "/bin/echo";
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char *exec_argv[] = { "echo", "ENV_VAR: ${ENV_VAR}", NULL };
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char *exec_envp[] = { "PATH=/bin", "ENV_VAR=pwd1", NULL };
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if (fork() == 0) {
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if (strcmp(argv[1], "execl") == 0) {
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execl(path, "echo", "ENV_VAR: ${ENV_VAR}", NULL);
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} else if (strcmp(argv[1], "execlp") == 0) {
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execlp(file, "echo", "ENV_VAR: ${ENV_VAR}", NULL);
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} else if (strcmp(argv[1], "execle") == 0) {
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execle(path, "echo", "ENV_VAR: ${ENV_VAR}", exec_envp, NULL);
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} else if (strcmp(argv[1], "execlpe") == 0) {
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execlpe(file, "echo", "ENV_VAR: ${ENV_VAR}", exec_envp, NULL);
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} else if (strcmp(argv[1], "execv") == 0) {
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execv(path, exec_argv);
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} else if (strcmp(argv[1], "execvp") == 0) {
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execvp(file, exec_argv);
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} else if (strcmp(argv[1], "execve") == 0) {
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execve(path, exec_argv, exec_envp);
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} else if (strcmp(argv[1], "execvpe") == 0) {
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execvpe(file, exec_argv, exec_envp);
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} else {
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__print_usage(argc, argv);
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return 1;
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}
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printf("Exec failed.\n");
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return 1;
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}
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wait(&status);
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return 0;
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}
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