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#include <netinet/in.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>
int main() {
struct sockaddr_in addr;
addr.sin_family = AF_INET; /* IPv4 */
addr.sin_port = htons(8000); /* Port */
addr.sin_addr.s_addr = INADDR_ANY; /* equals to 0.0.0.0 */
int sfd = socket(AF_INET, SOCK_STREAM, 0);
if (sfd == -1) {
perror("could not open socket");
return 1;
}
int opt = 1;
setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
int bind_addr = bind(sfd, (struct sockaddr *)&addr, sizeof(addr));
if (bind_addr == -1) {
perror("could not bind socket");
return 1;
}
int listen_addr = listen(sfd, 100);
if (listen_addr == -1) {
perror("could not listen");
return 1;
}
struct pollfd fds[256];
fds[0].fd = sfd; /* socket file descriptor */
fds[0].events = POLLIN; /* data to read */
nfds_t nfds = 1; /* non file descriptor. something with timeout */
while (1) {
/* we start the polling here */
int ready =
poll(fds, nfds, -1); /* poll to accept many conn simultaneously */
if (ready == -1) {
perror("could not run poll");
return 1;
}
char buf[1024];
ssize_t n;
while ((n = read(conn, buf, sizeof(buf))) > 0) {
write(conn, buf, n);
}
}
return 0;
}
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