X-Git-Url: https://gapil.gnulinux.it/gitweb/?p=gapil.git;a=blobdiff_plain;f=listati%2Fpoll_echod.c;fp=listati%2Fpoll_echod.c;h=91b53cefee58f03f0a9ae6d4944800d24d5b01fc;hp=0000000000000000000000000000000000000000;hb=630c685145f488d9a3b7b81a25619982dbbb25ea;hpb=d0e8bddbdc1549d29aa3b45a06d60482c2179377

diff --git a/listati/poll_echod.c b/listati/poll_echod.c
new file mode 100644
index 0000000..91b53ce
--- /dev/null
+++ b/listati/poll_echod.c
@@ -0,0 +1,60 @@
+    /* initialize all needed variables */
+    poll_set = (struct pollfd *) malloc(n * sizeof(struct pollfd));
+    max_fd = list_fd;                 /* maximum now is listening socket */
+    for (i=0; i<n; i++) {
+	poll_set[i].fd = -1;
+	poll_set[i].events = POLLRDNORM;
+    }
+    poll_set[max_fd].fd = list_fd;
+    /* main loop, wait for connection and data inside a select */
+    while (1) {    
+	while ( ((n = poll(poll_set, max_fd + 1, -1)) < 0) 
+		&& (errno == EINTR));         /* wait for data or connection */
+	if (n < 0) {                          /* on real error exit */
+	    PrintErr("poll error");
+	    exit(1);
+	}
+	/* on activity */
+	if (poll_set[list_fd].revents & POLLRDNORM) {  /* if new connection */
+	    n--;                              /* decrement active */
+	    len = sizeof(c_addr);             /* and call accept */
+	    if ((fd = accept(list_fd, (struct sockaddr *)&c_addr, &len)) < 0) {
+		PrintErr("accept error");
+		exit(1);
+	    }
+	    poll_set[fd].fd = fd;             /* set new connection socket */
+	    if (max_fd < fd) max_fd = fd;     /* if needed set new maximum */
+	}
+	/* loop on open connections */
+	i = list_fd;                  /* first socket to look */
+	while (n != 0) {              /* loop until active */
+	    i++;                      /* start after listening socket */
+	    if (poll_set[i].fd == -1) continue;   /* closed, go next */
+	    if (poll_set[i].revents & (POLLRDNORM|POLLERR)) {
+		n--;                         /* decrease active */
+		nread = read(i, buffer, MAXLINE);     /* read operations */
+		if (nread < 0) {
+		    PrintErr("Errore in lettura");
+		    exit(1);
+		}
+		if (nread == 0) {            /* if closed connection */
+		    close(i);                /* close file */
+		    poll_set[i].fd = -1;          /* mark as closed in table */
+		    if (max_fd == i) {       /* if was the maximum */
+			while (poll_set[--i].fd == -1);    /* loop down */
+			max_fd = i;          /* set new maximum */
+			break;               /* and go back to select */
+		    }
+		    continue;                /* continue loop on open */
+		}
+		nwrite = FullWrite(i, buffer, nread); /* write data */
+		if (nwrite) {
+		    PrintErr("Errore in scrittura");
+		    exit(1);
+		}
+	    }
+	}
+    }
+    /* normal exit, never reached */
+    exit(0);
+}