135 lines
2.8 KiB
C++
135 lines
2.8 KiB
C++
/* remote_exec.c -- Written by Curtis Olson */
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/* -- for CSci 5502 */
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h> // atoi()
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#include <string.h> // bcopy()
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#include <iostream>
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#include <string>
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int make_socket (char *host, unsigned short int port) {
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int sock;
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struct sockaddr_in name;
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struct hostent *hp;
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// Create the socket.
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sock = socket (PF_INET, SOCK_STREAM, 0);
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if (sock < 0) {
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perror ("socket");
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exit (EXIT_FAILURE);
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}
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// specify address family
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name.sin_family = AF_INET;
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// get the hosts official name/info
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hp = gethostbyname(host);
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// Connect this socket to the host and the port specified on the
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// command line
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bcopy(hp->h_addr, &(name.sin_addr.s_addr), hp->h_length);
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name.sin_port = htons(port);
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if ( connect(sock, (struct sockaddr *) &name,
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sizeof(struct sockaddr_in)) < 0 )
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{
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close(sock);
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perror("Cannot connect to stream socket");
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return -1;
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}
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return sock;
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}
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// connect to the server and get the next task
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long int get_next_task( const string& host, int port, long int last_tile ) {
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long int tile;
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int sock, len;
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fd_set ready;
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char message[256];
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while ( (sock = make_socket( host.c_str(), port )) < 0 ) {
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// loop till we get a socket connection
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sleep(1);
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}
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// build a command string from the argv[]'s
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sprintf(message, "%ld", last_tile);
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// send command and arguments to remote server
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if ( write(sock, message, sizeof(message)) < 0 ) {
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perror("Cannot write to stream socket");
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}
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// loop until remote program finishes
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cout << "querying server for next task ..." << endl;
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FD_ZERO(&ready);
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FD_SET(sock, &ready);
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// block until input from sock
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select(32, &ready, 0, 0, NULL);
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cout << " received reply" << endl;
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if ( FD_ISSET(sock, &ready) ) {
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/* input coming from socket */
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if ( (len = read(sock, message, 1024)) > 0 ) {
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message[len] = '\0';
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tile = atoi(message);
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cout << " tile to construct = " << tile << endl;
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close(sock);
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return tile;
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} else {
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close(sock);
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return -1;
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}
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}
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close(sock);
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return -1;
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}
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// build the specified tile, return true if contruction completed
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// successfully
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bool construct_tile( long int tile ) {
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return true;
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}
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main(int argc, char *argv[]) {
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long int tile, last_tile;
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bool result;
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// Check usage
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if ( argc < 3 ) {
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printf("Usage: %s remote_machine port\n", argv[0]);
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exit(1);
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}
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string host = argv[1];
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int port = atoi( argv[2] );
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last_tile = 0;
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while ( (tile = get_next_task( host, port, last_tile )) >= 0 ) {
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result = construct_tile( tile );
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if ( result ) {
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last_tile = tile;
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} else {
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last_tile = -tile;
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}
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}
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}
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