vs2013 调试libevent 源码

自己内功的提升，无非是向前辈学习和修炼自身，对于编码也是如此，学习优秀的库只有从

源代码学起，才能深刻理解库实现的来龙去脉，加深自己的理解，提升自己的功力。

今天就介绍一下vs2013 下面调试libevent源码。不需要创建sln解决方案，只需要创建工程，包含

源码目录即可源码调试。

1、手工添加print-winsocke-errors.c文件，不然nmake编译的时候会报错。

vs2013 调试libevent 源码

print-winsocke-errors.c源代码程序：

 1 #include <winsock2.h>
 2 #include <windows.h>
 3 
 4 #include <stdlib.h>
 5 #include <stdio.h>
 6 
 7 #include "event2/event.h"
 8 #include "event2/util.h"
 9 #include "event2/thread.h"
10 
11 #define E(x) printf (#x " -> \"%s\"\n", evutil_socket_error_to_string (x));
12 
13 int main (int argc, char **argv)
14 {
15   int i, j;
16   const char *s1, *s2;
17 
18 #ifdef EVTHREAD_USE_WINDOWS_THREADS_IMPLEMENTED
19   evthread_use_windows_threads ();
20 #endif
21 
22   s1 = evutil_socket_error_to_string (WSAEINTR);
23 
24   for (i = 0; i < 3; i++) {
25     printf ("\niteration %d:\n\n", i);
26     E(WSAEINTR);
27     E(WSAEACCES);
28     E(WSAEFAULT);
29     E(WSAEINVAL);
30     E(WSAEMFILE);
31     E(WSAEWOULDBLOCK);
32     E(WSAEINPROGRESS);
33     E(WSAEALREADY);
34     E(WSAENOTSOCK);
35     E(WSAEDESTADDRREQ);
36     E(WSAEMSGSIZE);
37     E(WSAEPROTOTYPE);
38     E(WSAENOPROTOOPT);
39     E(WSAEPROTONOSUPPORT);
40     E(WSAESOCKTNOSUPPORT);
41     E(WSAEOPNOTSUPP);
42     E(WSAEPFNOSUPPORT);
43     E(WSAEAFNOSUPPORT);
44     E(WSAEADDRINUSE);
45     E(WSAEADDRNOTAVAIL);
46     E(WSAENETDOWN);
47     E(WSAENETUNREACH);
48     E(WSAENETRESET);
49     E(WSAECONNABORTED);
50     E(WSAECONNRESET);
51     E(WSAENOBUFS);
52     E(WSAEISCONN);
53     E(WSAENOTCONN);
54     E(WSAESHUTDOWN);
55     E(WSAETIMEDOUT);
56     E(WSAECONNREFUSED);
57     E(WSAEHOSTDOWN);
58     E(WSAEHOSTUNREACH);
59     E(WSAEPROCLIM);
60     E(WSASYSNOTREADY);
61     E(WSAVERNOTSUPPORTED);
62     E(WSANOTINITIALISED);
63     E(WSAEDISCON);
64     E(WSATYPE_NOT_FOUND);
65     E(WSAHOST_NOT_FOUND);
66     E(WSATRY_AGAIN);
67     E(WSANO_RECOVERY);
68     E(WSANO_DATA);
69     E(0xdeadbeef); /* test the case where no message is available */
70 
71     /* fill up the hash table a bit to make sure it grows properly */
72     for (j = 0; j < 50; j++) {
73       int err;
74       evutil_secure_rng_get_bytes(&err, sizeof(err));
75       evutil_socket_error_to_string(err);
76     }
77   }
78 
79   s2 = evutil_socket_error_to_string (WSAEINTR);
80   if (s1 != s2)
81     printf ("caching failed!\n");
82 
83   libevent_global_shutdown ();
84 
85   return EXIT_SUCCESS;
86 }

2、修改Makefile.nmake

将

CFLAGS=$(CFLAGS) /Ox /W3 /wd4996 /nologo

改为

CFLAGS=$(CFLAGS) /Od /W3 /wd4996 /nologo /Zi

使用/Od禁止优化，使用/Zi 生成调试信息。

3、vs2013命令行编译：nmake /f Makefile.nmake

编译生成：

vs2013 调试libevent 源码

4、新建工程，附加源码调试

解决方案包含源代码目录：

vs2013 调试libevent 源码

　 lib包含目录添加刚才生成的

vs2013 调试libevent 源码

　　所在目录

5、源码跟踪调试

F11跳入源码调试：

vs2013 调试libevent 源码

附上测试代码：

  1 // libevent-test.cpp : 定义控制台应用程序的入口点。
  2 //
  3 
  4 #include "stdafx.h"
  5 
  6 #pragma comment(lib,"ws2_32.lib")
  7 #pragma comment(lib,"wsock32.lib")
  8 #pragma comment(lib,"libevent.lib")
  9 #pragma comment(lib,"libevent_core.lib")
 10 #pragma comment(lib,"libevent_extras.lib")
 11 
 12 
 13 
 14 #include <sys/types.h>
 15 
 16 #include <event2/event-config.h>
 17 
 18 #include <sys/stat.h>
 19 #ifndef _WIN32
 20 #include <sys/queue.h>
 21 #include <unistd.h>
 22 #endif
 23 #include <time.h>
 24 #ifdef EVENT__HAVE_SYS_TIME_H
 25 #include <sys/time.h>
 26 #endif
 27 #include <fcntl.h>
 28 #include <stdlib.h>
 29 #include <stdio.h>
 30 #include <string.h>
 31 #include <errno.h>
 32 
 33 #include <event2/event.h>
 34 #include <event2/event_struct.h>
 35 #include <event2/util.h>
 36 
 37 #ifdef _WIN32
 38 #include <winsock2.h>
 39 #endif
 40 
 41 struct timeval lasttime;
 42 
 43 int event_is_persistent;
 44 
 45 static void
 46 timeout_cb(evutil_socket_t fd, short event, void *arg)
 47 {
 48     struct timeval newtime, difference;
 49     struct event *timeout = (struct event *)arg;
 50     double elapsed;
 51 
 52     evutil_gettimeofday(&newtime, NULL);
 53     evutil_timersub(&newtime, &lasttime, &difference);
 54     elapsed = difference.tv_sec +
 55         (difference.tv_usec / 1.0e6);
 56 
 57     printf("timeout_cb called at %d: %.3f seconds elapsed.\n",
 58         (int)newtime.tv_sec, elapsed);
 59     lasttime = newtime;
 60 
 61     if (!event_is_persistent) {
 62         struct timeval tv;
 63         evutil_timerclear(&tv);
 64         tv.tv_sec = 2;
 65         event_add(timeout, &tv);
 66     }
 67 }
 68 
 69 int
 70 main(int argc, char **argv)
 71 {
 72     struct event timeout;
 73     struct timeval tv;
 74     struct event_base *base;
 75     int flags;
 76 
 77 #ifdef _WIN32
 78     WORD wVersionRequested;
 79     WSADATA wsaData;
 80 
 81     wVersionRequested = MAKEWORD(2, 2);
 82 
 83     (void)WSAStartup(wVersionRequested, &wsaData);
 84 #endif
 85 
 86     if (argc == 2 && !strcmp(argv[1], "-p")) {
 87         event_is_persistent = 1;
 88         flags = EV_PERSIST;
 89     }
 90     else {
 91         event_is_persistent = 0;
 92         flags = 0;
 93     }
 94 
 95     /* Initalize the event library */
 96     base = event_base_new();
 97 
 98     /* Initalize one event */
 99     event_assign(&timeout, base, -1, flags, timeout_cb, (void*)&timeout);
100 
101     evutil_timerclear(&tv);
102     tv.tv_sec = 2;
103     event_add(&timeout, &tv);
104 
105     evutil_gettimeofday(&lasttime, NULL);
106 
107     event_base_dispatch(base);
108 
109     return (0);
110 }

　　以上就是vs2013下的源码跟踪调试，下面就开始对libevent深入学习了。

　　如有转载，请注明出处。

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vs2013 调试libevent 源码

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