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/* A simple server in the internet domain using TCP
The port number is passed as an argument */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
void error(const char *msg) {
perror(msg);
exit(1);
}
int main(int argc, char *argv[]) {
int sockfd, newsockfd;
socklen_t clilen;
char buffer[1024];
char ack[4];
struct sockaddr_un serv_addr, cli_addr;
int n;
sockfd = socket(AF_UNIX, SOCK_STREAM, 0);
if (sockfd < 0)
error("ERROR opening socket");
bzero((char *) &serv_addr, sizeof(serv_addr));
serv_addr.sun_family = AF_UNIX;
strcpy(serv_addr.sun_path, "/var/tmp/qt_c_socket_default");
unlink("/var/tmp/qt_c_socket_default");
if (bind(sockfd, (struct sockaddr *) &serv_addr, sizeof(serv_addr)) < 0)
error("ERROR on binding");
if (listen(sockfd, 5) == -1) {
error("ERROR on listen");
}
strcpy(ack,"ACK");
for (;;) {
int done;
printf("Waiting for a connection...\n");
clilen = sizeof(cli_addr);
newsockfd = accept(sockfd, (struct sockaddr *) &cli_addr, &clilen);
if (newsockfd < 0)
error("ERROR on accept");
printf("Connected.\n");
done = 0;
do {
bzero(buffer, 1024);
n = read(newsockfd, buffer, 1023);
if (n <= 0) {
if (n<0) error("ERROR reading from socket");
done = 1;
}
printf("Here is the message: \"%s\"\n", buffer);
if(!done) {
if (send(newsockfd, ack, sizeof(ack), 0) < 0) {
error("ERROR on send");
done = 1;
}
}
} while (!done);
close(newsockfd);
}
close(sockfd);
return 0;
}
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