64 lines
1.9 KiB
C
64 lines
1.9 KiB
C
#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/types.h>
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#include <time.h>
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int main(int argc, char *argv[])
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{
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int listenfd = 0, connfd = 0;
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struct sockaddr_in serv_addr;
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char sendBuff[1025];
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time_t ticks;
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/* creates an UN-named socket inside the kernel and returns
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* an integer known as socket descriptor
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* This function takes domain/family as its first argument.
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* For Internet family of IPv4 addresses we use AF_INET
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*/
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listenfd = socket(AF_INET, SOCK_STREAM, 0);
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memset(&serv_addr, '0', sizeof(serv_addr));
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memset(sendBuff, '0', sizeof(sendBuff));
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serv_addr.sin_family = AF_INET;
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serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
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serv_addr.sin_port = htons(5000);
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/* The call to the function "bind()" assigns the details specified
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* in the structure 『serv_addr' to the socket created in the step above
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*/
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bind(listenfd, (struct sockaddr*)&serv_addr, sizeof(serv_addr));
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/* The call to the function "listen()" with second argument as 10 specifies
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* maximum number of client connections that server will queue for this listening
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* socket.
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*/
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listen(listenfd, 10);
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while(1)
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{
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/* In the call to accept(), the server is put to sleep and when for an incoming
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* client request, the three way TCP handshake* is complete, the function accept()
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* wakes up and returns the socket descriptor representing the client socket.
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*/
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connfd = accept(listenfd, (struct sockaddr*)NULL, NULL);
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/* As soon as server gets a request from client, it prepares the date and time and
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* writes on the client socket through the descriptor returned by accept()
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*/
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ticks = time(NULL);
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snprintf(sendBuff, sizeof(sendBuff), "%.24s\r\n", ctime(&ticks));
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write(connfd, sendBuff, strlen(sendBuff));
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close(connfd);
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sleep(1);
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}
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}
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