55 lines
1.1 KiB
C
55 lines
1.1 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <netinet/in.h>
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void die(const char *msg) {
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perror(msg);
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exit(1);
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}
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int main(int argc, char *argv[]) {
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int sockfd;
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int newsockfd;
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int port = 7;
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socklen_t clilen;
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struct sockaddr_in serv_addr, cli_addr;
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int n;
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char msg[256];
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sockfd = socket(AF_INET, SOCK_STREAM, 0);
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if (sockfd < 0) die("error opening socket.");
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bzero((char *) &serv_addr, sizeof(serv_addr));
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serv_addr.sin_family = AF_INET;
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serv_addr.sin_addr.s_addr = INADDR_ANY;
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serv_addr.sin_port = htons(port);
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if (bind(sockfd, (struct sockaddr *) &serv_addr,
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sizeof(serv_addr)) < 0) die("error binding socket.");
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clilen = sizeof(cli_addr);
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while (1) {
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listen(sockfd, 5);
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newsockfd = accept(sockfd, (struct sockaddr *) &cli_addr, &clilen);
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if (newsockfd < 0) die("error accepting");
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while (1) {
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memset(msg, 0, sizeof(msg));
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n = read(newsockfd, msg, 256);
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if (n < 0) break;
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n = write(newsockfd, msg, strlen(msg));
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if (n < 0) break;
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}
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close(newsockfd);
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}
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close(sockfd);
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return 0;
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}
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