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This article mainly shows you "how to use libevent to write a simple server", the content is easy to understand, clear, hope to help you solve doubts, the following let the editor lead you to study and learn "how to use libevent to write a simple server" this article.

Sample code

# include # include void sock_read (int fd, short event, void * arg) {char buf [255]; int len; struct event * ev = arg; len = recv (fd, buf, sizeof (buf)-1,0); if (len =-1) {perror ("recv error/n") If (errno! = EAGAIN & & errno! = EINTR) {close (fd); free (ev);} return;} else if (len = = 0) {close (fd); fprintf (stderr, "Connection closed/n"); free (ev); return;} buf [len] ='/ 0' Fprintf (stdout, "Read:% Spura", buf); / * Reschedule this event * / event_add (ev, NULL);} void sock_accept (int fd, short event, void * arg) {struct event * ev = arg; struct sockaddr addr; socklen_t len = sizeof (addr) / / because this structure is to be used for a long time, rev must be allocated dynamically, otherwise it will be automatically released after leaving this function, resulting in segment fault struct event* rev = (struct event*) malloc (sizeof (* rev)); int s = accept (fd, & addr, & len); if (s = =-1) {perror ("accept error/n"); return } fprintf (stdout, "accept socket:% DBO", s); / * Initalize one event * / event_set (rev, s, EV_READ, sock_read, rev); / * Add it to the active events, without a timeout * / event_add (rev, NULL); / * Reschedule this event * / event_add (ev, NULL);} intmain (int argc, char * * argv) {struct event ev; int fd; struct sockaddr_in addr Fd = socket (AF_INET, SOCK_STREAM, 0); if (fd = =-1) {perror ("socket error/n"); exit (- 1);} bzero (& addr, sizeof (addr)); addr.sin_family = AF_INET; addr.sin_port = htons (10000); addr.sin_addr.s_addr = 0 If (bind (fd, (struct sockaddr*) & addr, sizeof (addr)) =-1) {perror ("bind error/n"); exit (- 1);} if (listen (fd, 5) = =-1) {perror ("listen error/n"); exit (- 1);} / * Initalize the event library * / event_init () / * Initalize one event * / event_set (& ev, fd, EV_READ, sock_accept, & ev); / * Add it to the active events, without a timeout * / event_add (& ev, NULL); event_dispatch (); return (0);} above is all the content of the article "how to write a simple server using libevent". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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