1 Linux Installation Libevent

Libevent official website : http://libevent.org/

online Documentation: http://www.wangafu.net/~nickm/libevent-2.0/doxygen/html/

: https://github.com/libevent/libevent/releases/

Unzip, compile, install

Create folder [email protected]:~$ mkdir libevent[email protected]:~$ cd libevent/Unzip file: [ email protected]:~/libevent$ tar xf libevent-2.0.22-stable.tar.gz [email  protected]:~/libevent$ cd libevent-2.0.22-stable/compilation Environment check: [email protected]:~/libevent/ libevent-2.0.22-stable$ ./configure [email protected]:~/libevent/libevent-2.0.22-stable$  Echo $?0 compiling:[email protected]:~/libevent/libevent-2.0.22-stable$ make -j 8[email  Protected]:~/libevent/libevent-2.0.22-stable$ echo $?0 Installation: [email protected]:~/libevent/ libevent-2.0.22-stable$ sudo make install [email protected]:~/libevent/ Libevent-2.0.22-stable$ echo $?0 Delete temporary files: [email protected]:~$ cd libevent/ LIBEVENT-2.0.22-STABLE/[EMAIL PROTECTED]:~/LIBEVENT/LIBEVENT-2.0.22-STABLE$ CD&NBSP, .... [Email protected]:~/libevent$ rm -rf libevent-2.0.22-stable[Email protected]:~/libevent$ echo $?0 

Test procedure:

[email protected]:~/libevent$ cat hello-world.c /*  this exmple  Program provides a trivial server program that listens for tcp   connections on port 9995.  When they arrive, it  writes a short message to  each client connection, and  closes each connection once it is flushed.  where possible,  it exits cleanly in response to a sigint  (CTRL-C). */#include  < string.h> #include  <errno.h> #include  <stdio.h> #include  <signal.h> #ifndef  win32#include <netinet/in.h># ifdef _xopen_source_extended#  include  <arpa/inet.h># endif#include <sys/socket.h> #endif #include <event2/ Bufferevent.h> #include  <event2/buffer.h> #include  <event2/listener.h> #include  <event2/util.h> #include  <event2/ event.h>static const char message[] =  "hello, world!\n"; static const &NBSP;INT&NBSP;PORT&NBSP;=&NBSP;9995;STATIC&NBSP;VOID&NBSP;LISTENER_CB (struct evconnlistener *,  evutil_socket_t,    struct sockaddr *, int socklen, void  *); Static void conn_writecb (struct bufferevent *, void *); static void &NBSP;CONN_EVENTCB (struct bufferevent *, short, void *); Static void signal_ CB (evutil_socket_t, short, void *); Intmain (INT&NBSP;ARGC,&NBSP;CHAR&NBSP;**ARGV) {struct  Event_base *base;struct evconnlistener *listener;struct event *signal_event;struct  sockaddr_in sin; #ifdef  WIN32WSADATA wsa_data; WSAStartup (0x0201, &wsa_data); #endifbase  = event_base_New ();if  (!base)  {fprintf (stderr,  "could not initialize libevent!\n"); return  1;} memset (&sin, 0, sizeof (sin)); Sin.sin_family = af_inet;sin.sin_port = htons ( PORT); Listener = evconnlistener_new_bind (base, listener_cb,  (void *) base,     lev_opt_reuseable| lev_opt_close_on_free, -1,     (struct sockaddr*) &sin,     sizeof (SIN));if  (!listener)  {fprintf (stderr,  "could not create a  Listener!\n "); return 1;} Signal_event = evsignal_new (base, sigint, signal_cb,  (void *) base);if  (! signal_event | |  event_add (signal_event, null) <0)  {fprintf (stderr,  "Could not create/add  a signal event!\n "); return 1;} Event_base_dispatch (base); Evconnlistener_free (listener); Event_free (signal_event); Event_base_free (base);p rintf ( The DoNe\n "); return 0;} STATIC&NBSP;VOIDLISTENER_CB (struct evconnlistener *listener, evutil_socket_t fd,     struct sockaddr *sa, int socklen, void *user_data) {struct  event_base *base = user_data;struct bufferevent *bev;bev =  Bufferevent_socket_new (Base, fd, bev_opt_close_on_free);if  (!bev)  {fprintf (stderr,  " Error constructing bufferevent! "); Event_base_loopbreak (base); return;} BUFFEREVENT_SETCB (Bev, null, conn_writecb, conn_eventcb, null); Bufferevent_enable (Bev,  ev_write); bufferevent_disable (Bev, ev_read); Bufferevent_write (Bev, message, strlen ( MESSAGE));} STATIC&NBSP;VOIDCONN_WRITECB (Struct bufferevent *bev, void *user_data) {struct  Evbuffer *output = bufferevent_get_output (Bev);if  (evbuffer_get_length (output)  ==  0)  {printf ("flushed answer\n"); buFferevent_free (BEV);}} STATIC&NBSP;VOIDCONN_EVENTCB (Struct bufferevent *bev, short events, void *user_ Data) {if  (events & bev_event_eof)  {printf ("connection closed.\n");  else if  (Events & bev_event_error)  {printf ("Got an error on  the connection: %s\n ",     strerror (errno));/*xxx win32*/}/* none  of the other events can happen here, since we haven ' t  Enabled * timeouts */bufferevent_free (BEV);} STATIC&NBSP;VOIDSIGNAL_CB (evutil_socket_t sig, short events, void *user_data) {struct  event_base *base = user_data;struct timeval delay = { 2, 0 &NBSP,};p rintf ("caught an interrupt signal; exiting cleanly in two  Seconds.\n "); Event_base_loopexit (Base, &delay);} Compiled operationsLine:[email protected]:~/libevent$ gcc hello-world.c -l event -wall   && ./a.out  View Port Monitoring:[email protected]:~$ sudo netstat -tanlp |  grep a.outtcp        0      0  0.0.0.0:9995            0.0.0.0:*                LISTEN       7740/a.out       native ip[email protected]:~$ ifconfig  ETH0ETH0&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;LINK&NBSP;ENCAP: Ethernet    Hardware Address  00:0c:29:c8:7a:35             inet  Address:11.11.11.5   Broadcast :11.11.11.255   mask: 255.255.255.0----------------------------------LAN Other machine access test: [email protected]: ~ $ nc 11.11.11.5 9995hello, world! [email protected]:~ $ nc 11.11.11.5 9995hello, world!

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1 Linux Installation Libevent