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Simple socket server in C using threads (pthread library)
Compiles on linux
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/* | |
C socket server example, handles multiple clients using threads | |
Compile | |
gcc server.c -lpthread -o server | |
*/ | |
#include<stdio.h> | |
#include<string.h> //strlen | |
#include<stdlib.h> //strlen | |
#include<sys/socket.h> | |
#include<arpa/inet.h> //inet_addr | |
#include<unistd.h> //write | |
#include<pthread.h> //for threading , link with lpthread | |
//the thread function | |
void *connection_handler(void *); | |
int main(int argc , char *argv[]) | |
{ | |
int socket_desc , client_sock , c; | |
struct sockaddr_in server , client; | |
//Create socket | |
socket_desc = socket(AF_INET , SOCK_STREAM , 0); | |
if (socket_desc == -1) | |
{ | |
printf("Could not create socket"); | |
} | |
puts("Socket created"); | |
//Prepare the sockaddr_in structure | |
server.sin_family = AF_INET; | |
server.sin_addr.s_addr = INADDR_ANY; | |
server.sin_port = htons( 8888 ); | |
//Bind | |
if( bind(socket_desc,(struct sockaddr *)&server , sizeof(server)) < 0) | |
{ | |
//print the error message | |
perror("bind failed. Error"); | |
return 1; | |
} | |
puts("bind done"); | |
//Listen | |
listen(socket_desc , 3); | |
//Accept and incoming connection | |
puts("Waiting for incoming connections..."); | |
c = sizeof(struct sockaddr_in); | |
//Accept and incoming connection | |
puts("Waiting for incoming connections..."); | |
c = sizeof(struct sockaddr_in); | |
pthread_t thread_id; | |
while( (client_sock = accept(socket_desc, (struct sockaddr *)&client, (socklen_t*)&c)) ) | |
{ | |
puts("Connection accepted"); | |
if( pthread_create( &thread_id , NULL , connection_handler , (void*) &client_sock) < 0) | |
{ | |
perror("could not create thread"); | |
return 1; | |
} | |
//Now join the thread , so that we dont terminate before the thread | |
//pthread_join( thread_id , NULL); | |
puts("Handler assigned"); | |
} | |
if (client_sock < 0) | |
{ | |
perror("accept failed"); | |
return 1; | |
} | |
return 0; | |
} | |
/* | |
* This will handle connection for each client | |
* */ | |
void *connection_handler(void *socket_desc) | |
{ | |
//Get the socket descriptor | |
int sock = *(int*)socket_desc; | |
int read_size; | |
char *message , client_message[2000]; | |
//Send some messages to the client | |
message = "Greetings! I am your connection handler\n"; | |
write(sock , message , strlen(message)); | |
message = "Now type something and i shall repeat what you type \n"; | |
write(sock , message , strlen(message)); | |
//Receive a message from client | |
while( (read_size = recv(sock , client_message , 2000 , 0)) > 0 ) | |
{ | |
//end of string marker | |
client_message[read_size] = '\0'; | |
//Send the message back to client | |
write(sock , client_message , strlen(client_message)); | |
//clear the message buffer | |
memset(client_message, 0, 2000); | |
} | |
if(read_size == 0) | |
{ | |
puts("Client disconnected"); | |
fflush(stdout); | |
} | |
else if(read_size == -1) | |
{ | |
perror("recv failed"); | |
} | |
return 0; | |
} |
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hi there! This code contains memory leak. See my reporitory for fixed version: https://github.com/mavstuff/threadtest/blob/master/server.c