kc3-lang/libevent/sample/event-test.c

• Show log

  Commit

• Hash : 94866c27
  Author :
  Date : 2012-11-01T17:38:34
  

  Compile without warnings on mingw64
  
  This is mostly a matter of catching cases where we were still
  assuming that evutil_socket_t could be used as an int.
  

Download

• sample/event-test.c

• /*
   * XXX This sample code was once meant to show how to use the basic Libevent
   * interfaces, but it never worked on non-Unix platforms, and some of the
   * interfaces have changed since it was first written.  It should probably
   * be removed or replaced with something better.
   *
   * Compile with:
   * cc -I/usr/local/include -o event-test event-test.c -L/usr/local/lib -levent
   */
  
  #include <event2/event-config.h>
  
  #include <sys/types.h>
  #include <sys/stat.h>
  #ifndef WIN32
  #include <sys/queue.h>
  #include <unistd.h>
  #include <sys/time.h>
  #else
  #include <winsock2.h>
  #include <windows.h>
  #endif
  #include <fcntl.h>
  #include <stdlib.h>
  #include <stdio.h>
  #include <string.h>
  #include <errno.h>
  
  #include <event.h>
  
  static void
  fifo_read(evutil_socket_t fd, short event, void *arg)
  {
  	char buf[255];
  	int len;
  	struct event *ev = arg;
  #ifdef WIN32
  	DWORD dwBytesRead;
  #endif
  
  	/* Reschedule this event */
  	event_add(ev, NULL);
  
  	fprintf(stderr, "fifo_read called with fd: %d, event: %d, arg: %p\n",
  	    (int)fd, event, arg);
  #ifdef WIN32
  	len = ReadFile((HANDLE)fd, buf, sizeof(buf) - 1, &dwBytesRead, NULL);
  
  	/* Check for end of file. */
  	if (len && dwBytesRead == 0) {
  		fprintf(stderr, "End Of File");
  		event_del(ev);
  		return;
  	}
  
  	buf[dwBytesRead] = '\0';
  #else
  	len = read(fd, buf, sizeof(buf) - 1);
  
  	if (len == -1) {
  		perror("read");
  		return;
  	} else if (len == 0) {
  		fprintf(stderr, "Connection closed\n");
  		return;
  	}
  
  	buf[len] = '\0';
  #endif
  	fprintf(stdout, "Read: %s\n", buf);
  }
  
  int
  main(int argc, char **argv)
  {
  	struct event evfifo;
  #ifdef WIN32
  	HANDLE socket;
  	/* Open a file. */
  	socket = CreateFileA("test.txt",	/* open File */
  			GENERIC_READ,		/* open for reading */
  			0,			/* do not share */
  			NULL,			/* no security */
  			OPEN_EXISTING,		/* existing file only */
  			FILE_ATTRIBUTE_NORMAL,	/* normal file */
  			NULL);			/* no attr. template */
  
  	if (socket == INVALID_HANDLE_VALUE)
  		return 1;
  
  #else
  	struct stat st;
  	const char *fifo = "event.fifo";
  	int socket;
  
  	if (lstat(fifo, &st) == 0) {
  		if ((st.st_mode & S_IFMT) == S_IFREG) {
  			errno = EEXIST;
  			perror("lstat");
  			exit(1);
  		}
  	}
  
  	unlink(fifo);
  	if (mkfifo(fifo, 0600) == -1) {
  		perror("mkfifo");
  		exit(1);
  	}
  
  	/* Linux pipes are broken, we need O_RDWR instead of O_RDONLY */
  #ifdef __linux
  	socket = open(fifo, O_RDWR | O_NONBLOCK, 0);
  #else
  	socket = open(fifo, O_RDONLY | O_NONBLOCK, 0);
  #endif
  
  	if (socket == -1) {
  		perror("open");
  		exit(1);
  	}
  
  	fprintf(stderr, "Write data to %s\n", fifo);
  #endif
  	/* Initalize the event library */
  	event_init();
  
  	/* Initalize one event */
  #ifdef WIN32
  	event_set(&evfifo, (evutil_socket_t)socket, EV_READ, fifo_read, &evfifo);
  #else
  	event_set(&evfifo, socket, EV_READ, fifo_read, &evfifo);
  #endif
  
  	/* Add it to the active events, without a timeout */
  	event_add(&evfifo, NULL);
  
  	event_dispatch();
  #ifdef WIN32
  	CloseHandle(socket);
  #endif
  	return (0);
  }
  
  

Download