mirror of
https://github.com/brendanhaines/RasPi.git
synced 2024-11-13 18:34:39 -07:00
56 lines
1.5 KiB
C
56 lines
1.5 KiB
C
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/* A simple server in the internet domain using TCP
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The port number is passed as an argument */
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#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 <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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void error(const char *msg)
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{
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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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{
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int sockfd, newsockfd, portno;
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socklen_t clilen;
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char buffer[256];
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struct sockaddr_in serv_addr, cli_addr;
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int n;
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if (argc < 2) {
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fprintf(stderr,"ERROR, no port provided\n");
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exit(1);
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}
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sockfd = socket(AF_INET, SOCK_STREAM, 0);
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if (sockfd < 0)
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error("ERROR opening socket");
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bzero((char *) &serv_addr, sizeof(serv_addr));
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portno = atoi(argv[1]);
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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(portno);
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if (bind(sockfd, (struct sockaddr *) &serv_addr,
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sizeof(serv_addr)) < 0)
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error("ERROR on binding");
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listen(sockfd,5);
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clilen = sizeof(cli_addr);
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newsockfd = accept(sockfd,
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(struct sockaddr *) &cli_addr,
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&clilen);
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if (newsockfd < 0)
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error("ERROR on accept");
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bzero(buffer,256);
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n = read(newsockfd,buffer,255);
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if (n < 0) error("ERROR reading from socket");
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printf("Here is the message: %s\n",buffer);
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n = write(newsockfd,"I got your message",18);
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if (n < 0) error("ERROR writing to socket");
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close(newsockfd);
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close(sockfd);
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return 0;
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}
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