Я пишу пользовательский VNC сервер-клиент. Однако после 159 команд каждый раз происходит сбой сервера. Я не могу понять, почему происходит сбой, но, похоже, что-то переполнено. Можно ли заполнить сокеты или стандартный ввод / вывод? Или это скорее что-то с моими элементами управления X?
Исходный код:
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/wait.h>
#include <sys/select.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/extensions/XTest.h>
void dostuff(int);
void error(const char *msg)
{
perror(msg);
exit(1);
}
int main(int argc, char *argv[])
{
int sockfd, newsockfd, portno, pid;
socklen_t clilen;
struct sockaddr_in serv_addr, cli_addr;
if (argc < 2)
{
fprintf(stderr,"ERROR, no port provided\n");
exit(1);
}
sockfd = socket(AF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
error("ERROR opening socket");
bzero((char *) &serv_addr, sizeof(serv_addr));
portno = atoi(argv[1]);
serv_addr.sin_family = AF_INET;
serv_addr.sin_addr.s_addr = INADDR_ANY;
serv_addr.sin_port = htons(portno);
if (bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0)
error("ERROR on binding");
listen(sockfd,5);
clilen = sizeof(cli_addr);
while (1)
{
newsockfd = accept(sockfd,
(struct sockaddr *) &cli_addr, &clilen);
if (newsockfd < 0)
error("ERROR on accept");
pid = fork();
if (pid < 0)
error("ERROR on fork");
if (pid == 0)
{
close(sockfd);
dostuff(newsockfd);
exit(0);
}
else close(newsockfd);
signal(SIGCHLD,SIG_IGN);
}
/* end of while */
close(sockfd);
return 0; /* we never get here */
}
/******** DOSTUFF() *********************
There is a separate instance of this function
for each connection. It handles all communication
once a connnection has been established.
*****************************************/
void dostuff (int sock)
{
while(1)
{
fflush(stdout);
int n;
char buffer[64];
bzero(buffer,64);
printf("START:\n");
n = read(sock,buffer,63);
printf("buffer[1]: %d \n", buffer[1]);
if (n < 0) error("ERROR reading from socket");
Display *thedisplay;
Window thewindow;
int screen;
screen=buffer[0]-48; //first element is always the screen number
printf("screen = %d \n", screen);
thedisplay=XOpenDisplay(NULL);
thewindow=XRootWindow(thedisplay,screen);
int screenwidth = DisplayWidth(thedisplay, screen);
int screenheight = DisplayHeight(thedisplay, screen);
printf("width: %d, height %d \n", screenwidth, screenheight);
printf("buff[1] = %d \n", buffer[1]);
//switch on second char
switch(buffer[1])
{
case 109: // second element == 'm' we treat it like a mousemove
printf("mousemovement\n");
int xcoord = 100*(buffer[3]-48)+10*(buffer[4]-48)+1*(buffer[5]-48);
int ycoord = 100*(buffer[7]-48)+10*(buffer[8]-48)+1*(buffer[9]-48);
if (buffer[2]==49) xcoord = xcoord*(-1);
if (buffer[6]==49) ycoord = ycoord*(-1);
//printf("dx: %d, dy: %d \n", xcoord, ycoord);
Window windowreturned;
int xroot, yroot, xwin, ywin, mask_return;
XQueryPointer(thedisplay, thewindow, &windowreturned, &windowreturned, &xroot, &yroot, &xwin, &ywin, &mask_return);
//printf("xroot X: %d Y: %d \n", xroot, yroot);
//printf("xcoord+xroot %d %d \n", xcoord+xroot, ycoord+yroot);
//printf("screenwidth %d %d \n", screenwidth, screenheight);
if (xcoord+xroot > 0 && xcoord+xroot < screenwidth && ycoord+yroot>0 && ycoord+yroot<screenheight)
{
//printf("good to go\n");
XWarpPointer(thedisplay,None,None,0,0,0,0,xcoord,ycoord);
XSync(thedisplay, False);
}
break;
case 107: //second element is a 'k' so we sendkey
SendKey (thedisplay, buffer[2]);
break;
case 98: // b us for mousebutton. 1 is leftclick, 2 is middle click, 3 is right click, 4 us up-scroll, 5 is downscroll
XTestGrabControl(thedisplay, True);
// XTestFakeButtonEvent(thedisplay, 1, True, 0);
// XTestFakeButtonEvent(thedisplay, 1, False, 0);
XTestFakeButtonEvent(thedisplay, buffer[2]-48, True, 0);
XTestFakeButtonEvent(thedisplay, buffer[2]-48, False, 0);
XSync (thedisplay, False);
XTestGrabControl (thedisplay, False);
break;
case 99: //second element is 'c', so we center on the screen
XWarpPointer(thedisplay,None,thewindow,0,0,0,0,screenwidth*.5,screenheight*.5);
XSync(thedisplay, False);
break;
default:
close(sock);
error("ERROR incorrect formattttttt\n");
break;
}
printf("got this far\n");
n = write(sock,"spanks\n",6);
if (n < 0) error("ERROR writing to socket\n");
}
}