Enrico Fraccaroli
65 lines
2.0 KiB
C
65 lines
2.0 KiB
C
/// MentOS, The Mentoring Operating system project
|
|
/// @file t_exec.c
|
|
/// @brief
|
|
/// @copyright (c) 2014-2021 This file is distributed under the MIT License.
|
|
/// See LICENSE.md for details.
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <sys/unistd.h>
|
|
#include <sys/wait.h>
|
|
#include <string.h>
|
|
|
|
static inline void __print_usage(int argc, char *argv[])
|
|
{
|
|
if (argc > 0) {
|
|
printf("%s: Usage: %s <exec_type>\n", argv[0], argv[0]);
|
|
printf("exec_type: execl, execlp, execle, execlpe, execv, execvp, execve, execvpe\n");
|
|
}
|
|
}
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
int status;
|
|
if (argc != 2) {
|
|
__print_usage(argc, argv);
|
|
return 1;
|
|
}
|
|
|
|
if (setenv("ENV_VAR", "pwd0", 0) == -1) {
|
|
printf("Failed to set env: `ENV_VAR`\n");
|
|
return 1;
|
|
}
|
|
|
|
char *file = "echo";
|
|
char *path = "/bin/echo";
|
|
char *exec_argv[] = { "echo", "ENV_VAR: ${ENV_VAR}", NULL };
|
|
char *exec_envp[] = { "PATH=/bin", "ENV_VAR=pwd1", NULL };
|
|
|
|
if (fork() == 0) {
|
|
if (strcmp(argv[1], "execl") == 0) {
|
|
execl(path, "echo", "ENV_VAR: ${ENV_VAR}", NULL);
|
|
} else if (strcmp(argv[1], "execlp") == 0) {
|
|
execlp(file, "echo", "ENV_VAR: ${ENV_VAR}", NULL);
|
|
} else if (strcmp(argv[1], "execle") == 0) {
|
|
execle(path, "echo", "ENV_VAR: ${ENV_VAR}", exec_envp, NULL);
|
|
} else if (strcmp(argv[1], "execlpe") == 0) {
|
|
execlpe(file, "echo", "ENV_VAR: ${ENV_VAR}", exec_envp, NULL);
|
|
} else if (strcmp(argv[1], "execv") == 0) {
|
|
execv(path, exec_argv);
|
|
} else if (strcmp(argv[1], "execvp") == 0) {
|
|
execvp(file, exec_argv);
|
|
} else if (strcmp(argv[1], "execve") == 0) {
|
|
execve(path, exec_argv, exec_envp);
|
|
} else if (strcmp(argv[1], "execvpe") == 0) {
|
|
execvpe(file, exec_argv, exec_envp);
|
|
} else {
|
|
__print_usage(argc, argv);
|
|
return 1;
|
|
}
|
|
printf("Exec failed.\n");
|
|
return 1;
|
|
}
|
|
wait(&status);
|
|
return 0;
|
|
} |