comparison src/liblo-0.26/examples/nonblocking_server_example.c @ 4:e13257ea84a4

Add bzip2, zlib, liblo, portaudio sources

+/*
+ *  nonblocking_server_example.c
+ *
+ *  This code demonstrates two methods of monitoring both an lo_server
+ *  and other I/O from a single thread.
+ *
+ *  Copyright (C) 2004 Steve Harris, Uwe Koloska
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU Lesser General Public License as
+ *  published by the Free Software Foundation; either version 2.1 of the
+ *  License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU Lesser General Public License for more details.
+ *
+ *  $Id$
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <strings.h>
+#include <unistd.h>
+
+#include "lo/lo.h"
+
+int done = 0;
+
+void error(int num, const char *m, const char *path);
+
+int generic_handler(const char *path, const char *types, lo_arg **argv,
+		    int argc, void *data, void *user_data);
+
+int foo_handler(const char *path, const char *types, lo_arg **argv, int argc,
+		 void *data, void *user_data);
+
+int quit_handler(const char *path, const char *types, lo_arg **argv, int argc,
+		 void *data, void *user_data);
+
+void read_stdin(void);
+
+int main()
+{
+    int lo_fd;
+    fd_set rfds;
+    struct timeval tv;
+    int retval;
+
+    /* start a new server on port 7770 */
+    lo_server s = lo_server_new("7770", error);
+
+    /* add method that will match any path and args */
+    lo_server_add_method(s, NULL, NULL, generic_handler, NULL);
+
+    /* add method that will match the path /foo/bar, with two numbers, coerced
+     * to float and int */
+    lo_server_add_method(s, "/foo/bar", "fi", foo_handler, NULL);
+
+    /* add method that will match the path /quit with no args */
+    lo_server_add_method(s, "/quit", "", quit_handler, NULL);
+
+    /* get the file descriptor of the server socket, if supported */
+    lo_fd = lo_server_get_socket_fd(s);
+
+    if (lo_fd > 0) {
+        
+        /* select() on lo_server fd is supported, so we'll use select()
+         * to watch both stdin and the lo_server fd. */
+
+        do {
+
+            FD_ZERO(&rfds);
+#ifndef WIN32
+            FD_SET(0, &rfds);  /* stdin */
+#endif
+            FD_SET(lo_fd, &rfds);
+
+            retval = select(lo_fd + 1, &rfds, NULL, NULL, NULL); /* no timeout */
+
+            if (retval == -1) {
+
+                printf("select() error\n");
+                exit(1);
+
+            } else if (retval > 0) {
+
+                if (FD_ISSET(0, &rfds)) {
+
+                    read_stdin();
+
+                }
+                if (FD_ISSET(lo_fd, &rfds)) {
+
+                    lo_server_recv_noblock(s, 0);
+
+                }
+            }
+
+        } while (!done);
+
+    } else {
+
+        /* lo_server protocol does not support select(), so we'll watch
+         * stdin while polling the lo_server. */
+#ifdef WIN32
+        printf("non-blocking input from stdin not supported under Windows\n");
+        exit(1);
+#else
+        do {
+
+            FD_ZERO(&rfds);
+            FD_SET(0, &rfds);
+            tv.tv_sec = 0;
+            tv.tv_usec = 10000;
+
+            retval = select(1, &rfds, NULL, NULL, &tv); /* timeout every 10ms */
+
+            if (retval == -1) {
+
+                printf("select() error\n");
+                exit(1);
+
+            } else if (retval > 0 && FD_ISSET(0, &rfds)) {
+
+                read_stdin();
+
+            }
+
+            lo_server_recv_noblock(s, 0);
+
+        } while (!done);
+#endif
+    }
+    
+    return 0;
+}
+
+void error(int num, const char *msg, const char *path)
+{
+    printf("liblo server error %d in path %s: %s\n", num, path, msg);
+}
+
+/* catch any incoming messages and display them. returning 1 means that the
+ * message has not been fully handled and the server should try other methods */
+int generic_handler(const char *path, const char *types, lo_arg **argv,
+		    int argc, void *data, void *user_data)
+{
+    int i;
+
+    printf("path: <%s>\n", path);
+    for (i=0; i<argc; i++) {
+	printf("arg %d '%c' ", i, types[i]);
+	lo_arg_pp(types[i], argv[i]);
+	printf("\n");
+    }
+    printf("\n");
+    fflush(stdout);
+
+    return 1;
+}
+
+int foo_handler(const char *path, const char *types, lo_arg **argv, int argc,
+		 void *data, void *user_data)
+{
+    /* example showing pulling the argument values out of the argv array */
+    printf("%s <- f:%f, i:%d\n\n", path, argv[0]->f, argv[1]->i);
+    fflush(stdout);
+
+    return 0;
+}
+
+int quit_handler(const char *path, const char *types, lo_arg **argv, int argc,
+		 void *data, void *user_data)
+{
+    done = 1;
+    printf("quiting\n\n");
+
+    return 0;
+}
+
+void read_stdin(void)
+{
+    char buf[256];
+    int len = read(0, buf, 256);
+    if (len > 0) {
+        printf("stdin: ");
+        fwrite(buf, len, 1, stdout);
+        printf("\n");
+        fflush(stdout);
+    }
+}
+
+/* vi:set ts=8 sts=4 sw=4: */