Specifications

University of Hertfordshire
47
#include <stdio.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
int port = 8000;
void main() {
struct sockaddr_in sin;
struct sockaddr_in pin;
int sock_descriptor;
int temp_sock_descriptor;
int address_size;
char buf[16384];
int i, len;
char *spec[3];
char result[];
sock_descriptor = socket(AF_INET, SOCK_STREAM, 0);
if (sock_descriptor == -1) {
perror("call to socket");
exit(1);
}
bzero(&sin, sizeof(sin));
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = INADDR_ANY;
sin.sin_port = htons(port);
if (bind(sock_descriptor, (struct sockaddr *)&sin, sizeof(sin)) == -1) {
perror("call to bind");
exit(1);
}
if (listen(sock_descriptor, 20) == -1) {
perror("call to listen");
exit(1);
}
printf("Accepting connections ...\n");
while(1) {
temp_sock_descriptor =
accept(sock_descriptor, (struct sockaddr *)&pin,
&address_size);
if (temp_sock_descriptor == -1) {
perror("call to accept");
exit(1);
}
if (recv(temp_sock_descriptor, buf, 16384, 0) == -1) {
perror("call to recv");
exit(1);
}
printf("received from client:%s\n", buf);
if (buf=="IP"){
system ("echo \"SEND 18 \'IP\'\"| cat - > /dev/gpib0");
printf("Preset HP8591 EM Spectrum Analyser \n");
}