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make chat server can choose port where it running #42

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make chat server can choose port where it running #42

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12 changes: 7 additions & 5 deletions smallchat-server.c
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Original file line number Diff line number Diff line change
Expand Up @@ -43,7 +43,7 @@
* =========================================================================== */

#define MAX_CLIENTS 1000 // This is actually the higher file descriptor.
#define SERVER_PORT 7711
#define DEFAULT_SERVER_PORT 7711

/* This structure represents a connected client. There is very little
* info about it: the socket descriptor and the nick name, if set, otherwise
Expand Down Expand Up @@ -113,7 +113,7 @@ void freeClient(struct client *c) {
}

/* Allocate and init the global stuff. */
void initChat(void) {
void initChat(int server_port) {
Chat = chatMalloc(sizeof(*Chat));
memset(Chat,0,sizeof(*Chat));
/* No clients at startup, of course. */
Expand All @@ -122,11 +122,12 @@ void initChat(void) {

/* Create our listening socket, bound to the given port. This
* is where our clients will connect. */
Chat->serversock = createTCPServer(SERVER_PORT);
Chat->serversock = createTCPServer(server_port);
if (Chat->serversock == -1) {
perror("Creating listening socket");
exit(1);
}
printf("smallchat server is run on port %d \n", server_port);
}

/* Send the specified string to all connected clients but the one
Expand All @@ -148,8 +149,9 @@ void sendMsgToAllClientsBut(int excluded, char *s, size_t len) {
* 1. Accept new clients connections if any.
* 2. Check if any client sent us some new message.
* 3. Send the message to all the other clients. */
int main(void) {
initChat();
int main(int argc, char **argv) {
int server_port = argc == 2 ? atoi(argv[1]) : DEFAULT_SERVER_PORT;
initChat(server_port);

while(1) {
fd_set readfds;
Expand Down