英文:
Memory leak in child process. How to handle memory in child processes
问题
node->path 和 node->token 是在父进程中动态分配的。
当我的 execve 返回 -1 因为无法执行程序时，我会遇到一些奇怪的内存泄漏问题，我无法解决。
我不知道如何处理这种情况。我已经尝试在子进程中的 execve 后释放内存，但这会导致无效的释放。
在子进程中，应该如何处理在父进程中分配的内存？
英文:
I'am writting a terminal and using the following function to execute a command :
void execute_input(t_list *node, char **envp)
{
int pid1;
int status;
if (ft_lstsize(node) > 1)
command_chain(node);
else if (is_builtin(node))
execute_builtin(node);
else
{
get_data()->executing_cmd = 1;
pid1 = fork();
if (pid1 == 0)
{
if (!access(node->token[0], X_OK))
node->path = node->token[0];
execve(node->path, node->token, envp);
exit(errno);
}
waitpid(pid1, &status, 0);
if (WIFEXITED(status))
get_data()->exit = WEXITSTATUS(status);
get_data()->executing_cmd = 0;
}
}
node->path and node->token were dynamically allocated in the parent.
When my execve returns -1 because he was unable to execute the program, I will have some weird memory leaks that I can't solve.
I don't know how to approach this situation. I have tried freeing the memory in the child process after execve but that will result in invalid free.
How should handle in the child process the memory that was allocaed in the parent process?
答案1
得分: 2
如果 execve 失败，你将立即退出子进程 [从技术上讲，你应该使用 _exit 而不是 exit，但现在不要担心这个]。
当你退出子进程时，操作系统会释放给它分配的 所有 资源，包括由 malloc 分配的所有内容。
因此，在子进程中不需要显式释放任何东西。
英文:
If execve fails, you're going to exit the child process immediately [technically you should be doing this with _exit instead of with exit, but don't worry about that right now].
When you exit the child process, the operating system deallocates all the resources allocated to it, including everything allocated by malloc.
Therefore, it is unnecessary to free anything explicitly in the child process.
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