如何使用libevent写一个简单的服务器

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示例代码

#include #include #include #include #include #include #include #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: %s/n", 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);    //由于此结构要长期使用，所以rev必须动态分配，否则离开此函数后会自动释放，导致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: %d/n", 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);}

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