Function sys_exec

components/lwp/lwp_syscall.c:1310–1339

* @brief Replaces the current process with a new process. * * This system call loads a new program into the current process's address space, * replacing the current program with the one specified by `filename`. It passes the * arguments `argv` and environment variables `envp` to the new program. If the execution * is successful, the current process is completely replaced, and no code after th

 * @see execve(), execvp(), execv(), execle()
 */
sysret_t sys_exec(char *filename, int argc, char **argv, char **envp)
{
    int ret = 0;
    int len = 0;
    char *kfilename = RT_NULL;

    len = lwp_user_strlen(filename);
    if (len <= 0)
    {
        return -EFAULT;
    }

    kfilename = (char *)kmem_get(len + 1);
    if (!kfilename)
    {
        return -ENOMEM;
    }

    if (lwp_get_from_user(kfilename, (void *)filename, len + 1) != (len + 1))
    {
        kmem_put(kfilename);
        return -EFAULT;
    }

    ret = lwp_execve(kfilename, 0, argc, argv, envp);

    kmem_put(kfilename);

    return ret;
}

/**
 * @brief Sends a signal to a process or a group of processes.