Examples with ErrnoException libcore.io.ErrnoException used on opensource projects

Example 46 with ErrnoException

use of libcore.io.ErrnoException in project XobotOS by xamarin.

the class ProcessManager method watchChildren.

/**
     * Loops indefinitely and calls ProcessManager.onExit() when children exit.
     */
private void watchChildren() {
    MutableInt status = new MutableInt(-1);
    while (true) {
        try {
            // Wait for children in our process group.
            int pid = Libcore.os.waitpid(0, status, 0);
            // Work out what onExit wants to hear.
            int exitValue;
            if (WIFEXITED(status.value)) {
                exitValue = WEXITSTATUS(status.value);
            } else if (WIFSIGNALED(status.value)) {
                exitValue = WTERMSIG(status.value);
            } else if (WIFSTOPPED(status.value)) {
                exitValue = WSTOPSIG(status.value);
            } else {
                throw new AssertionError("unexpected status from waitpid: " + status.value);
            }
            onExit(pid, exitValue);
        } catch (ErrnoException errnoException) {
            if (errnoException.errno == ECHILD) {
                // Expected errno: there are no children to wait for.
                // onExit will sleep until it is informed of another child coming to life.
                waitForMoreChildren();
                continue;
            } else {
                throw new AssertionError(errnoException);
            }
        }
    }
}