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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: 

libevent-examples:  

multi-thread libevent:  

针对第一个例子：

le.c内容：

#include 
    
     #include 
     
      #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_ERRtypedef 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/