Function sys_getppid

components/lwp/lwp_syscall.c:1527–1541

* @brief Retrieves the parent process ID of the calling process. * * This system call returns the process ID (PID) of the parent process of the calling process. * The parent process is the process that created the calling process, typically through a * system call like `fork()`. This information can be useful for process management and * for determining the hierarchy of processes. * * @retu

 * @see getpid(), getuid(), getgid()
 */
sysret_t sys_getppid(void)
{
    rt_lwp_t process;

    process = lwp_self();
    if (process->parent == RT_NULL)
    {
        LOG_E("%s: process %d has no parent process", __func__, lwp_to_pid(process));
        return 0;
    }
    else
    {
        return lwp_to_pid(process->parent);
    }
}

/**
 * @brief Retrieves the priority of a process or process group.