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Now we seem to have a proper server that correctly closes clients.

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This commit is contained in:
ha7ilm 2015-11-06 14:14:02 +01:00
parent 7bae8b1ad8
commit cb1b6ac8e2
2 changed files with 26 additions and 13 deletions
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38
ddcd.cpp
View file

@ -51,6 +51,12 @@ int set_nonblocking(int fd)
return 1; return 1;
} }
int proc_exists(pid_t pid)
{
if(pid==0 || pid==1) return 1;
return kill(pid, 0) != -1;
}
client_t* this_client; client_t* this_client;
int main(int argc, char* argv[]) int main(int argc, char* argv[])
@ -119,13 +125,12 @@ int main(int argc, char* argv[])
if( listen(listen_socket, 10) == -1 ) if( listen(listen_socket, 10) == -1 )
error_exit(MSG_START "cannot listen() on socket.\n"); error_exit(MSG_START "cannot listen() on socket.\n");
fprintf(stderr,MSG_START "listening on %s:%d\n", inet_ntoa(addr_host.sin_addr), host_port);
struct sockaddr_in addr_cli; struct sockaddr_in addr_cli;
socklen_t addr_cli_len = sizeof(addr_cli); socklen_t addr_cli_len = sizeof(addr_cli);
int new_socket; int new_socket;
//The server will wait on these sockets later...
//Set stdin and listen_socket to non-blocking //Set stdin and listen_socket to non-blocking
if(set_nonblocking(STDIN_FILENO) || set_nonblocking(listen_socket)) if(set_nonblocking(STDIN_FILENO) || set_nonblocking(listen_socket))
error_exit(MSG_START "cannot set_nonblocking().\n"); error_exit(MSG_START "cannot set_nonblocking().\n");
@ -200,13 +205,20 @@ int main(int argc, char* argv[])
if(write(clients[i]->pipefd[1], buf, retval)==-1) if(write(clients[i]->pipefd[1], buf, retval)==-1)
{ {
if(!clients[i]->error) print_client(clients[i], "lost buffer, failed to write pipe"); if(!clients[i]->error)
else clients[i]->error=1; {
print_client(clients[i], "lost buffer, failed to write pipe.");
clients[i]->error=1;
}
//fprintf(stderr, MSG_START "errno is %d\n", errno); //usually 11 //fprintf(stderr, MSG_START "errno is %d\n", errno); //usually 11
int wpstatus; //int wpstatus;
int wpresult = waitpid(clients[i]->pid, &wpstatus, WNOHANG); //int wpresult = waitpid(clients[i]->pid, &wpstatus, WNOHANG);
if(wpresult == -1) print_client(clients[i], "error while waitpid()!"); //fprintf(stderr, MSG_START "pid is %d\n",clients[i]->pid);
else if(wpresult == 0) //perror("somethings wrong");
//if(wpresult == -1) print_client(clients[i], "error while waitpid()!");
//else if(wpresult == 0)
waitpid(clients[i]->pid, NULL, WNOHANG);
if(!proc_exists(clients[i]->pid))
{ {
//Client exited! //Client exited!
print_client(clients[i], "closing client from main process."); print_client(clients[i], "closing client from main process.");
@ -214,10 +226,10 @@ int main(int argc, char* argv[])
close(clients[i]->socket); close(clients[i]->socket);
delete clients[i]; delete clients[i];
clients.erase(clients.begin()+i); clients.erase(clients.begin()+i);
print_client(clients[i], "okay."); print_client(clients[i], "done closing client from main process.");
} }
} }
else clients[i]->error=0; else { if(clients[i]->error) print_client(clients[i], "pipe okay again."); clients[i]->error=0; }
} }
} }
//TODO: at the end, server closes pipefd[1] for client //TODO: at the end, server closes pipefd[1] for client
@ -229,7 +241,7 @@ int main(int argc, char* argv[])
void print_client(client_t* client, const char* what) void print_client(client_t* client, const char* what)
{ {
fprintf(stderr,MSG_START " (client %s:%d) %s\n", inet_ntoa(client->addr.sin_addr), client->addr.sin_port, what); fprintf(stderr,MSG_START "(client %s:%d) %s\n", inet_ntoa(client->addr.sin_addr), client->addr.sin_port, what);
} }
void client_cleanup() void client_cleanup()
@ -245,7 +257,7 @@ void client()
read(this_client->pipefd[0],buf,bufsizeall); read(this_client->pipefd[0],buf,bufsizeall);
if(send(this_client->socket,buf,bufsizeall,0)==-1) if(send(this_client->socket,buf,bufsizeall,0)==-1)
{ {
print_client(this_client, "closing."); print_client(this_client, "client process is exiting.");
exit(0); exit(0);
} }
} }

1
ddcd.h
View file

@ -29,3 +29,4 @@ typedef struct client_s
void client(); void client();
void error_exit(const char* why); void error_exit(const char* why);
void print_client(client_t* client, const char* what); void print_client(client_t* client, const char* what);
int proc_exists(pid_t pid);