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libevent

    1: /*
    2:  * Compile with:
    3:  * cc -I/usr/local/include -o event-test event-test.c -L/usr/local/lib -levent
    4:  */
    5: 
    6: #ifdef HAVE_CONFIG_H
    7: #include "config.h"
    8: #endif
    9: 
   10: #include <sys/types.h>
   11: #include <sys/stat.h>
   12: #ifndef WIN32
   13: #include <sys/queue.h>
   14: #include <unistd.h>
   15: #include <sys/time.h>
   16: #else
   17: #include <windows.h>
   18: #endif
   19: #include <fcntl.h>
   20: #include <stdlib.h>
   21: #include <stdio.h>
   22: #include <string.h>
   23: #include <errno.h>
   24: 
   25: #include <event.h>
   26: 
   27: static void
   28: fifo_read(int fd, short event, void *arg)
   29: {
   30: 	char buf[255];
   31: 	int len;
   32: 	struct event *ev = arg;
   33: #ifdef WIN32
   34: 	DWORD dwBytesRead;
   35: #endif
   36: 
   37: 	/* Reschedule this event */
   38: 	event_add(ev, NULL);
   39: 
   40: 	fprintf(stderr, "fifo_read called with fd: %d, event: %d, arg: %p\n",
   41: 		fd, event, arg);
   42: #ifdef WIN32
   43: 	len = ReadFile((HANDLE)fd, buf, sizeof(buf) - 1, &dwBytesRead, NULL);
   44: 
   45: 	// Check for end of file. 
   46: 	if(len && dwBytesRead == 0) {
   47: 		fprintf(stderr, "End Of File");
   48: 		event_del(ev);
   49: 		return;
   50: 	}
   51: 
   52: 	buf[dwBytesRead] = '\0';
   53: #else
   54: 	len = read(fd, buf, sizeof(buf) - 1);
   55: 
   56: 	if (len == -1) {
   57: 		perror("read");
   58: 		return;
   59: 	} else if (len == 0) {
   60: 		fprintf(stderr, "Connection closed\n");
   61: 		return;
   62: 	}
   63: 
   64: 	buf[len] = '\0';
   65: #endif
   66: 	fprintf(stdout, "Read: %s\n", buf);
   67: }
   68: 
   69: int
   70: main (int argc, char **argv)
   71: {
   72: 	struct event evfifo;
   73: #ifdef WIN32
   74: 	HANDLE socket;
   75: 	// Open a file. 
   76: 	socket = CreateFileA("test.txt",     // open File 
   77: 			GENERIC_READ,                 // open for reading 
   78: 			0,                            // do not share 
   79: 			NULL,                         // no security 
   80: 			OPEN_EXISTING,                // existing file only 
   81: 			FILE_ATTRIBUTE_NORMAL,        // normal file 
   82: 			NULL);                        // no attr. template 
   83: 
   84: 	if(socket == INVALID_HANDLE_VALUE)
   85: 		return 1;
   86: 
   87: #else
   88: 	struct stat st;
   89: 	const char *fifo = "event.fifo";
   90: 	int socket;
   91:  
   92: 	if (lstat (fifo, &st) == 0) {
   93: 		if ((st.st_mode & S_IFMT) == S_IFREG) {
   94: 			errno = EEXIST;
   95: 			perror("lstat");
   96: 			exit (1);
   97: 		}
   98: 	}
   99: 
  100: 	unlink (fifo);
  101: 	if (mkfifo (fifo, 0600) == -1) {
  102: 		perror("mkfifo");
  103: 		exit (1);
  104: 	}
  105: 
  106: 	/* Linux pipes are broken, we need O_RDWR instead of O_RDONLY */
  107: #ifdef __linux
  108: 	socket = open (fifo, O_RDWR | O_NONBLOCK, 0);
  109: #else
  110: 	socket = open (fifo, O_RDONLY | O_NONBLOCK, 0);
  111: #endif
  112: 
  113: 	if (socket == -1) {
  114: 		perror("open");
  115: 		exit (1);
  116: 	}
  117: 
  118: 	fprintf(stderr, "Write data to %s\n", fifo);
  119: #endif
  120: 	/* Initalize the event library */
  121: 	event_init();
  122: 
  123: 	/* Initalize one event */
  124: #ifdef WIN32
  125: 	event_set(&evfifo, (int)socket, EV_READ, fifo_read, &evfifo);
  126: #else
  127: 	event_set(&evfifo, socket, EV_READ, fifo_read, &evfifo);
  128: #endif
  129: 
  130: 	/* Add it to the active events, without a timeout */
  131: 	event_add(&evfifo, NULL);
  132: 	
  133: 	event_dispatch();
  134: #ifdef WIN32
  135: 	CloseHandle(socket);
  136: #endif
  137: 	return (0);
  138: }
  139: