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socket.c
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socket.c
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/* socket.c: Simple Socket Functions */
#include "spidey.h"
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netdb.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <unistd.h>
/**
* Allocate socket, bind it, and listen to specified port.
*
* @param port Port number to bind to and listen on.
* @return Allocated server socket file descriptor.
**/
int socket_listen(const char *port) {
/* Lookup server address information */
struct addrinfo hints = {
.ai_family = AF_UNSPEC,
.ai_socktype = SOCK_STREAM,
.ai_flags = AI_PASSIVE,
};
struct addrinfo *results;
int status;
if((status = getaddrinfo(NULL,port,&hints,&results))!= 0){
log("getaddrinfo failed.");
return EXIT_FAILURE;
}
/* For each server entry, allocate socket and try to connect */
int socket_fd = -1;
for (struct addrinfo *p = results; p != NULL && socket_fd < 0; p = p->ai_next) {
/* Allocate socket */
if((socket_fd = socket(p->ai_family, p->ai_socktype, p->ai_protocol)) <0) {
log("Unable to make socket.");
continue;
}
/* Bind socket */
if(bind(socket_fd, p->ai_addr, p->ai_addrlen) < 0){
log("Unable to bind.");
close(socket_fd);
return EXIT_FAILURE;
}
/* Listen to socket */
if(listen(socket_fd, SOMAXCONN) < 0) {
log("Unable to listen.");
close(socket_fd);
return EXIT_FAILURE;
}
}
freeaddrinfo(results);
return socket_fd;
}
/* vim: set expandtab sts=4 sw=4 ts=8 ft=c: */