如何编译和安装libevent【转】

时间：2024-09-20 19:36:44

转自：http://www.open-open.com/lib/view/open1455522194089.html

来自： http://blog.****.net/yangzhenping/article/details/50668445

如何编译和安装libevent

编译和安装步骤：

$ apt-get install git
$ git clone https://github.com/libevent/libevent.git
$ cd libevent
$ apt-get install cmake
$ apt-get install libssl-dev
$ mkdir build && cd build
$ cmake .. # Default to Unix Makefiles.
$ make
$ make verify # (optional)
$ make install

一些学习文档：

Fast portable non-blocking network programming with Libevent:http://www.wangafu.net/~nickm/libevent-book/ 
libevent-examples: https://github.com/jasonish/libevent-examples 
multi-thread libevent: https://sourceforge.net/projects/libevent-thread/

针对第一个例子：

http://www.wangafu.net/~nickm/libevent-book/Ref1_libsetup.html
le.c内容：

#include <event2/event.h>

#include <stdio.h>

#define EVENT_LOG_DEBUG 0

#define EVENT_LOG_MSG   1

#define EVENT_LOG_WARN  2

#define EVENT_LOG_ERR   3

/* Deprecated; see note at the end of this section */

#define _EVENT_LOG_DEBUG EVENT_LOG_DEBUG

#define _EVENT_LOG_MSG   EVENT_LOG_MSG

#define _EVENT_LOG_WARN  EVENT_LOG_WARN

#define _EVENT_LOG_ERR   EVENT_LOG_ERR

typedef void (*event_log_cb)(int severity, const char *msg);

void event_set_log_callback(event_log_cb cb);

static void discard_cb(int severity, const char *msg)

{

    /* This callback does nothing. */

}

static FILE *logfile = NULL;

static void write_to_file_cb(int severity, const char *msg)

{

    const char *s;

    if (!logfile)

        return;

    switch (severity) {

        case _EVENT_LOG_DEBUG: s = "debug"; break;

        case _EVENT_LOG_MSG:   s = "msg";   break;

        case _EVENT_LOG_WARN:  s = "warn";  break;

        case _EVENT_LOG_ERR:   s = "error"; break;

        default:               s = "?";     break; /* never reached */

    }

    fprintf(logfile, "[%s] %s\n", s, msg);

}

/* Turn off all logging from Libevent. */

void suppress_logging(void)

{

    event_set_log_callback(discard_cb);

}

/* Redirect all Libevent log messages to the C stdio file 'f'. */

void set_logfile(FILE *f)

{

    logfile = f;

    event_set_log_callback(write_to_file_cb);

}

int main(int argc, char **argv)

{

FILE *fp=fopen("/tmp/test.txt", "w+");

set_logfile(fp);

fclose(fp);

return 0;

}

$ gcc le.c -o le -levent 
$ ./le 
没有输出任何文本到/tmp/test.txt，因为main函数中没有调用log，当然文中建议我们不要直接使用用户提供的event_log_cb回调函数，因为这样做是不安全的。 
有人翻译了这本文档，可以参考下： 
http://popozhu.github.io/page/7/ 
http://popozhu.github.io/page/6/

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