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flightgear/Tools/Construct/Parallel/client.cxx

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