libevent 小例

#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <event.h>
#include <stdio.h>
#include <time.h>


void connection_time(int fd, short event, struct event *arg)
{
char buf[32];
struct tm t;
time_t now;

time(&now);
localtime_r(&now, &t);
asctime_r(&t, buf);

write(fd, buf, strlen(buf));
shutdown(fd, SHUT_RDWR);

free(arg);
}

connection_accept(int fd, short event, void *arg)
{
/* for debugging */
fprintf(stderr, "%s(): fd = %d, event = %d.\n", __func__, fd, event);

/* Accept a new connection. */
struct sockaddr_in s_in;
socklen_t len = sizeof(s_in);
int ns = accept(fd, (struct sockaddr *) &s_in, &len);
if (ns < 0) {
perror("accept");
return;
}

/* Install time server. */
struct event *ev = malloc(sizeof(struct event));
event_set(ev, ns, EV_WRITE, (void *) connection_time, ev);
event_add(ev, NULL);
}


int main(void)
{
/* Request socket. */
int s = socket(PF_INET, SOCK_STREAM, 0);
if (s < 0) {
perror("socket");
exit(1);
}

/* bind() */
struct sockaddr_in s_in;
bzero(&s_in, sizeof(s_in));
s_in.sin_family = AF_INET;
s_in.sin_port = htons(9000);
s_in.sin_addr.s_addr = INADDR_ANY;
if (bind(s, (struct sockaddr *) &s_in, sizeof(s_in)) < 0) {
perror("bind");
exit(1);
}

/* listen() */
if (listen(s, 5) < 0) {
perror("listen");
exit(1);
}

/* Initial libevent. */
event_init();

/* Create event. */
struct event ev;
event_set(&ev, s, EV_READ | EV_PERSIST, connection_accept, &ev);

/* Add event. */
event_add(&ev, NULL);

event_dispatch();

return 0;
}


gcc -o libe -I/app/soft/libevent/include -L/app/soft/libevent/lib -levent libe.c