echoserver.c

#include <stdio.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>

int
main(int argc, char *argv[])
{
        int sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
        if (sock == -1) {
                perror("Socket");
                return -1;
        }
        printf("Socket FD: %d\n", sock);

        int one = 1;
        if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(int)) == -1) {
                perror("Sockopt");
                return -1;
        }

        struct sockaddr_in addr;
        memset(addr.sin_zero, '\0', sizeof addr.sin_zero);
        addr.sin_family = AF_INET;
        addr.sin_port = htons(2323);
        addr.sin_addr.s_addr = htonl(INADDR_ANY);
        int b = bind(sock, (struct sockaddr *) &addr, sizeof addr);
        if (b == -1) {
                perror("Bind");
                return -1;
        }

        int l = listen(sock, 10);
        if (l == -1) {
                perror("Listen");
                return -1;
        }

        int a;
        struct sockaddr accept_addr;
        socklen_t addr_len;
        ssize_t read;
        char buf[128];
        /*
        for (;;) {
        */
                a = accept(sock, &accept_addr, &addr_len);
                if (a == -1) {
                        perror("Accept");
                        return -1;
                }
                printf("Got it\n");
                read = recv(a, (void *) &buf, 127, 0);
                printf("read %zd\n", read);
                if (read == -1) {
                        perror("Recv");
                        return -1;
                }
                if (read == 0) {
                        perror("Recv");
                        printf("peer closed conn\n");
                        return -1;
                }
                buf[(int) read] = '\0';
                printf("%s", buf);
                /*
        }
                */

        int c = close(sock);
        if (c == -1) {
                perror("Close");
                return -1;
        }
        
        return 0;
}