libevent的日志模块的使用

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#include "event2/event.h"
#include <stdio.h>
#include <time.h>

static void event_selfarg_cb(evutil_socket_t fd, short event, void *arg) {
    struct event *ev = arg;
    struct event_base *base = event_get_base(ev);
    printf("===event trigger %p == %p, is %s\n", ev, event_base_get_running_event(base), ev == event_base_get_running_event(base)?"true":"false");
    event_base_loopexit(base, NULL);
}
// 日志回调函数
void custom_log_callback(int severity,  const char *msg) {
    printf("%s\n", msg);
}

int main() {
    // 设置日志级别为 DEBUG
    event_enable_debug_logging(EVENT_DBG_ALL);
    // 设置日志回调函数
    event_set_log_callback(custom_log_callback);

    struct timeval qsec = {2, 100 * 1000};
    struct event_base *base = event_base_new();
    struct event * ev = evtimer_new(base, event_selfarg_cb, event_self_cbarg() );
    printf("add event, info: ptr=%p cbk = %p\n", ev, event_selfarg_cb );
    evtimer_add(ev, &qsec);
    event_base_loop(base, 0);
    event_base_free(base);
    return 0;
}

运行结果

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add event, info: ptr=0x55e22d62a970 cbk = 0x55e22c2d9b99
event_add: event: 0x55e22d62a970 (fd -1),    EV_TIMEOUT call 0x55e22c2d9b99
event_add: event 0x55e22d62a970, timeout in 2 seconds 100000 useconds, call 0x55e22c2d9b99
timeout_next: event: 0x55e22d62a970, in 2 seconds, 100000 useconds
epoll_dispatch: epoll_wait reports 0
event_del: 0x55e22d62a970 (fd -1), callback 0x55e22c2d9b99
timeout_process: event: 0x55e22d62a970, call 0x55e22c2d9b99
event_active: 0x55e22d62a970 (fd -1), res 1, callback 0x55e22c2d9b99
event_del: 0x55e22d62a970 (fd -1), callback 0x55e22c2d9b99
event_process_active: event: 0x55e22d62a970,    call 0x55e22c2d9b99
===event trigger 0x55e22d62a970 == 0x55e22d62a970, is true
event_active: 0x55e22d62ae60 (fd -1), res 1, callback 0x55e22c2dac30
event_del: 0x55e22d62ae60 (fd -1), callback 0x55e22c2dac30
event_process_active: event: 0x55e22d62ae60,    call 0x55e22c2dac30
event_base_loop: asked to terminate loop.
event_base_free_: 0 events freed