/* ** $Id: mginit.c,v 1.20 2006/06/12 06:40:35 weiym Exp $**** Listing 31.1**** mginit.c: Sample program for MiniGUI Programming Guide**      A simple mginit program.**** Copyright (C) 2003 ~ 2006 Feynman Software.**** License: GPL*/#include <stdio.h>#include <stdlib.h>#include <string.h>#include <unistd.h>#include <signal.h>#include <time.h>#include <sys/types.h>#include <sys/wait.h>#include <minigui/common.h>#include <minigui/minigui.h>#include <minigui/gdi.h>#include <minigui/window.h>static BOOL quit = FALSE;static void on_new_del_client (int op, int cli){           static int nr_clients = 0;    if (op == LCO_NEW_CLIENT) {        nr_clients ++;    }       else if (op == LCO_DEL_CLIENT) {        nr_clients --;        if (nr_clients == 0) {            printf ("There is no any client, I will quit.\n");            quit = TRUE;        }                       else if (nr_clients < 0) {            printf ("Serious error: nr_clients less than zero.\n");        }    }    else        printf ("Serious error: incorrect operations.\n");}static pid_t exec_app (const char* file_name, const char* app_name){    pid_t pid = 0;    if ((pid = vfork ()) > 0) {        fprintf (stderr, "new child, pid: %d.\n", pid);    }    else if (pid == 0) {        execl (file_name, app_name, NULL);        perror ("execl");        _exit (1);    }    else {        perror ("vfork");    }    return pid;}static unsigned int old_tick_count;static pid_t pid_scrnsaver = 0;static int my_event_hook (PMSG msg){    old_tick_count = GetTickCount ();    if (pid_scrnsaver) {        kill (pid_scrnsaver, SIGINT);        ShowCursor (TRUE);        pid_scrnsaver = 0;    }    if (msg->message == MSG_KEYDOWN) {        switch (msg->wParam) {            case SCANCODE_F1:               exec_app ("./edit", "edit");               break;            case SCANCODE_F2:               exec_app ("./timeeditor", "timeeditor");               break;            case SCANCODE_F3:               exec_app ("./propsheet", "propsheet");               break;            case SCANCODE_F4:               exec_app ("./bmpbkgnd", "bmpbkgnd");               break;	}    }    return HOOK_GOON;}static void child_wait (int sig){    int pid;    int status;    while ((pid = waitpid (-1, &status, WNOHANG)) > 0) {        if (WIFEXITED (status))            printf ("--pid=%d--status=%x--rc=%d---\n", pid, status, WEXITSTATUS(status));        else if (WIFSIGNALED(status))            printf ("--pid=%d--signal=%d--\n", pid, WTERMSIG (status));    }}int MiniGUIMain (int args, const char* arg[]){    MSG msg;    struct sigaction siga;    siga.sa_handler = child_wait;    siga.sa_flags  = 0;    memset (&siga.sa_mask, 0, sizeof(sigset_t));    sigaction (SIGCHLD, &siga, NULL);    OnNewDelClient = on_new_del_client;    if (!ServerStartup (0 , 0 , 0)) {        fprintf (stderr,                  "Can not start the server of MiniGUI-Processes: mginit.\n");        return 1;    }    SetServerEventHook (my_event_hook);    if (args > 1) {        if (exec_app (arg[1], arg[1]) == 0)            return 3;    }    else {        if (exec_app ("./helloword", "helloworld") == 0)            return 3;    }    old_tick_count = GetTickCount ();    while (!quit && GetMessage (&msg, HWND_DESKTOP)) {        if (pid_scrnsaver == 0 && GetTickCount () > old_tick_count + 1000) {            ShowCursor (FALSE);            pid_scrnsaver = exec_app ("./scrnsaver", "scrnsaver");        }        DispatchMessage (&msg);    }    return 0;}