Implementata parzialmente la select

7.client-server-select/daytimesrv.c

@@ -0,0 +1,145 @@
+
+
+#include	"../basic.h"
+#include	<time.h>
+
+void sigchldaction (int signal){
+
+	int status, pid;
+     
+   for (pid = waitpid(-1,&status,WNOHANG);pid > 0;pid = waitpid(-1,&status,WNOHANG)){
+   	// server: child terminated
+   }  
+
+
+}
+
+void sigpipeaction (int signal){
+    
+    //fprintf(stderr, "Sigpipe catturato\n");
+    
+}
+
+typedef struct message {
+	char data[100];
+}t_message;
+
+
+int main(int argc, char **argv) {
+	int			listenfd, connfd, n;
+	struct sockaddr_in	servaddr;
+	
+
+//////////////////////////////////////////////////////////// SIGNALS
+///////SIGCHLD
+struct sigaction sigchldstructure;
+       sigchldstructure.sa_handler = sigchldaction;
+       sigchldstructure.sa_flags = 0;
+          
+sigaction (SIGCHLD, &sigchldstructure, NULL);
+
+///////SIGPIPE
+struct sigaction sigpipestructure;
+    sigpipestructure.sa_handler = sigpipeaction;
+    sigpipestructure.sa_flags = 0;
+    
+sigaction (SIGPIPE, &sigpipestructure, NULL);
+//////////////////////////////////////////////////////////// END SIGNALS
+	
+
+
+	if (argc != 2 ){
+		printf("usage: daytimesrv <porta>\n");
+		exit(0);
+}
+	if( (listenfd = socket(AF_INET, SOCK_STREAM, 0)) < 0){
+		printf("socket error\n");
+		exit(0);
+}
+	bzero(&servaddr, sizeof(servaddr));
+	servaddr.sin_family      = AF_INET;
+	servaddr.sin_addr.s_addr = htonl(INADDR_ANY);   /* wildcard address */
+	servaddr.sin_port        = htons(atoi(argv[1])); /* server port */
+
+	if( (bind(listenfd, (struct sockaddr *) &servaddr, sizeof(servaddr))) < 0){
+		printf("bind error\n"); exit(0);
+}
+	if( listen(listenfd, 5) < 0 )
+		{ printf("listen error\n");
+		  exit(0);
+		}
+		
+	
+	
+	fd_set  fd_set_1;
+	FD_ZERO(&fd_set_1);
+	/*
+	void FD_CLR(int fd, fd_set *set);
+       int  FD_ISSET(int fd, fd_set *set);
+       void FD_SET(int fd, fd_set *set);
+       void FD_ZERO(fd_set *set);
+       */
+	
+	struct timeval timer;
+		timer.tv_sec = 99999999;
+		timer.tv_usec = 0;
+
+
+	
+	for ( ; ; ) {
+		
+		
+		if( (connfd = accept(listenfd, (struct sockaddr *) &client_address_struct, &client_address_struct_size)) < 0)
+		{
+			if(errno == EINTR || errno==ECONNABORTED)
+				continue;
+			printf("accept error\n");
+			exit(1);
+		}
+		
+		int split = fork();
+			
+		if ( split < 0) {
+			printf("fork for iterative server failed\n");
+			exit(-1);
+		}
+		
+		if (split == 0){
+			close(listenfd);
+		
+
+			t_message m;
+			int ready_fds_to_read = 0;
+			
+			FD_set(connfd,&fd_set_1);
+			
+			for (ready_fds_to_read = select( connfd + 1, fd_set_1, NULL,NULL,&timer);
+			     ready_fds_to_read <= 0 ;
+			     ready_fds_to_read = select( connfd + 1, fd_set_1, NULL,NULL,&timer)){
+				
+				if (ready_fds_to_read == -1 && errno == EINTR ){ continue;}
+				if (ready_fds_to_read ==  0) {timer.tv_sec = 99999999;continue;}
+				// write code to inform client that server has an internal error
+				exit(0);
+				
+			}// wait for nonblocking fd in read set
+			
+			 int ridden;
+			 if( FD_ISSET(connfd, fd_set_1) ){
+				for (ridden = read (connfd,&m,sizeof(m)); ridden <= 0;ridden = read (connfd,&m,sizeof(m))){
+					if (errno == EINTR){continue;} else {exit(0);}
+				}
+				
+				fprint(stdout,%s,m.data);
+				
+				
+			 }
+			 
+			 exit(0);
+		
+		
+		}else {
+			close(connfd);
+		}
+	}
+}