Initial checkin of libvncserver external library
Change-Id: Ie7c0947e3184490a566a63981ca9baaad2fbcaa3
diff --git a/examples/1instance.c b/examples/1instance.c
new file mode 100644
index 0000000..f6c4315
--- /dev/null
+++ b/examples/1instance.c
@@ -0,0 +1,141 @@
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdio.h>
+
+typedef struct {
+ char* filename; /* this file is the pipe (set by user) */
+ char is_server; /* this is set by open_control_file */
+ int fd; /* this is set by open_control_file */
+} single_instance_struct;
+
+/* returns fd, is_server is set to -1 if server, 0 if client */
+int open_control_file(single_instance_struct* str)
+{
+ struct stat buf;
+
+ if(stat(str->filename,&buf)) {
+ mkfifo(str->filename,128|256);
+ str->is_server=-1;
+ str->fd=open(str->filename,O_NONBLOCK|O_RDONLY);
+ } else {
+ str->fd=open(str->filename,O_NONBLOCK|O_WRONLY);
+ if(errno==ENXIO) {
+ str->is_server=-1;
+ str->fd=open(str->filename,O_NONBLOCK|O_RDONLY);
+ } else
+ str->is_server=0;
+ }
+
+ return(str->fd);
+}
+
+void delete_control_file(single_instance_struct* str)
+{
+ remove(str->filename);
+}
+
+void close_control_file(single_instance_struct* str)
+{
+ close(str->fd);
+}
+
+typedef void (*event_dispatcher)(char* message);
+
+int get_next_message(char* buffer,int len,single_instance_struct* str,int usecs)
+{
+ struct timeval tv;
+ fd_set fdset;
+ int num_fds;
+
+ FD_ZERO(&fdset);
+ FD_SET(str->fd,&fdset);
+ tv.tv_sec=0;
+ tv.tv_usec=usecs;
+
+ num_fds=select(str->fd+1,&fdset,NULL,NULL,&tv);
+ if(num_fds) {
+ int reallen;
+
+ reallen=read(str->fd,buffer,len);
+ if(reallen==0) {
+ close(str->fd);
+ str->fd=open(str->filename,O_NONBLOCK|O_RDONLY);
+ num_fds--;
+ }
+ buffer[reallen]=0;
+#ifdef DEBUG_1INSTANCE
+ if(reallen!=0) rfbLog("message received: %s.\n",buffer);
+#endif
+ }
+
+ return(num_fds);
+}
+
+int dispatch_event(single_instance_struct* str,event_dispatcher dispatcher,int usecs)
+{
+ char buffer[1024];
+ int num_fds;
+
+ if((num_fds=get_next_message(buffer,1024,str,usecs)) && buffer[0])
+ dispatcher(buffer);
+
+ return(num_fds);
+}
+
+int loop_if_server(single_instance_struct* str,event_dispatcher dispatcher)
+{
+ open_control_file(str);
+ if(str->is_server) {
+ while(1)
+ dispatch_event(str,dispatcher,50);
+ }
+
+ return(str->fd);
+}
+
+void send_message(single_instance_struct* str,char* message)
+{
+#ifdef DEBUG_1INSTANCE
+ int i=
+#endif
+ write(str->fd,message,strlen(message));
+#ifdef DEBUG_1INSTANCE
+ rfbLog("send: %s => %d(%d)\n",message,i,strlen(message));
+#endif
+}
+
+#ifdef DEBUG_MAIN
+
+#include <stdio.h>
+#include <stdlib.h>
+
+single_instance_struct str1 = { "/tmp/1instance" };
+
+void my_dispatcher(char* message)
+{
+#ifdef DEBUG_1INSTANCE
+ rfbLog("Message arrived: %s.\n",message);
+#endif
+ if(!strcmp(message,"quit")) {
+ delete_control_file(str1);
+ exit(0);
+ }
+}
+
+int main(int argc,char** argv)
+{
+ int i;
+
+ loop_if_server(str1,my_dispatcher);
+
+ for(i=1;i<argc;i++)
+ send_event(str1,argv[i]);
+
+ return(0);
+}
+
+#endif