编译libevent源代码(Windows)

 

　　学习笔记，只是记录本次成功用libevent源代码进行编译。环境为MinGW+VS2008+Msys。

0.下载libevent库

　　http://libevent.org/ 下载stable稳定版的库。

1.编译

　　一开始我用MinGW进行编译的，但是总是出现问题。后来参考了这个博客：http://m.blog.csdn.net/blog/bojie5744/39698599 ，把vs的运行环境包含进来，然后再进行编译

call "C:\Program Files\Microsoft Visual Studio 9.0\VC\vcvarsall.bat"

　　./configure ; make ; make install;

　　如果不install也可以，libevent头文件在include里面，而生成的库在.libs里面，由于使用的是vs的运行环境。所以libevent源代码编译后的库后缀为lib，而非以前的a文件。复制 libevent.lib;libevent_core.lib;libevent_extra.lib;(最后给出我编译后的文件，方便没有vs编译环境的人下载使用。) 如果为了以后方便，可以把include目录里文件复制到开发环境的include里面，而.libs里面的三个文件也可以拷贝到mingw的lib文件夹里面。

2.libevent测试代码

1 #include <winsock2.h>
2 #include <event2/event.h>
3 #include <event2/event_struct.h> 
4 
5 int main(int argc, char **argv)
6 {
7     event timeout;
8     return (0);
9 }

　　编译选项为

　　g++ test.cpp -Iinclude -L. -levent -lws2_32

　　注意测试的编译还是不通过的。要把libevent.lib 文件名改为event.lib就可以通过了，具体为什么就还不清楚。至于为什么MS系的lib库和mingw的的a库文件有什么区别，在Windows下mingw高级版本，两者是没有区别的，都是可以调用使用的。

3.libevent自带的http服务器源码(在sample中的http-server.c)

  1 /*
  2   A trivial static http webserver using Libevent's evhttp.
  3 
  4   This is not the best code in the world, and it does some fairly stupid stuff
  5   that you would never want to do in a production webserver. Caveat hackor!
  6 
  7  */
  8 
  9 /* Compatibility for possible missing IPv6 declarations */
 10 #include "../util-internal.h"
 11 
 12 #include <stdio.h>
 13 #include <stdlib.h>
 14 #include <string.h>
 15 
 16 #include <sys/types.h>
 17 #include <sys/stat.h>
 18 
 19 #ifdef _WIN32
 20 #include <winsock2.h>
 21 #include <ws2tcpip.h>
 22 #include <windows.h>
 23 #include <io.h>
 24 #include <fcntl.h>
 25 #ifndef S_ISDIR
 26 #define S_ISDIR(x) (((x) & S_IFMT) == S_IFDIR)
 27 #endif
 28 #else
 29 #include <sys/stat.h>
 30 #include <sys/socket.h>
 31 #include <signal.h>
 32 #include <fcntl.h>
 33 #include <unistd.h>
 34 #include <dirent.h>
 35 #endif
 36 
 37 #include <event2/event.h>
 38 #include <event2/http.h>
 39 #include <event2/buffer.h>
 40 #include <event2/util.h>
 41 #include <event2/keyvalq_struct.h>
 42 
 43 #ifdef EVENT__HAVE_NETINET_IN_H
 44 #include <netinet/in.h>
 45 # ifdef _XOPEN_SOURCE_EXTENDED
 46 #  include <arpa/inet.h>
 47 # endif
 48 #endif
 49 
 50 #ifdef _WIN32
 51 #ifndef stat
 52 #define stat _stat
 53 #endif
 54 #ifndef fstat
 55 #define fstat _fstat
 56 #endif
 57 #ifndef open
 58 #define open _open
 59 #endif
 60 #ifndef close
 61 #define close _close
 62 #endif
 63 #ifndef O_RDONLY
 64 #define O_RDONLY _O_RDONLY
 65 #endif
 66 #endif
 67 
 68 char uri_root[512];
 69 
 70 static const struct table_entry {
 71     const char *extension;
 72     const char *content_type;
 73 } content_type_table[] = {
 74     { "txt", "text/plain" },
 75     { "c", "text/plain" },
 76     { "h", "text/plain" },
 77     { "html", "text/html" },
 78     { "htm", "text/htm" },
 79     { "css", "text/css" },
 80     { "gif", "image/gif" },
 81     { "jpg", "image/jpeg" },
 82     { "jpeg", "image/jpeg" },
 83     { "png", "image/png" },
 84     { "pdf", "application/pdf" },
 85     { "ps", "application/postsript" },
 86     { NULL, NULL },
 87 };
 88 
 89 /* Try to guess a good content-type for 'path' */
 90 static const char *
 91 guess_content_type(const char *path)
 92 {
 93     const char *last_period, *extension;
 94     const struct table_entry *ent;
 95     last_period = strrchr(path, '.');
 96     if (!last_period || strchr(last_period, '/'))
 97         goto not_found; /* no exension */
 98     extension = last_period + 1;
 99     for (ent = &content_type_table[0]; ent->extension; ++ent) {
100         if (!evutil_ascii_strcasecmp(ent->extension, extension))
101             return ent->content_type;
102     }
103 
104 not_found:
105     return "application/misc";
106 }
107 
108 /* Callback used for the /dump URI, and for every non-GET request:
109  * dumps all information to stdout and gives back a trivial 200 ok */
110 static void
111 dump_request_cb(struct evhttp_request *req, void *arg)
112 {
113     const char *cmdtype;
114     struct evkeyvalq *headers;
115     struct evkeyval *header;
116     struct evbuffer *buf;
117 
118     switch (evhttp_request_get_command(req)) {
119     case EVHTTP_REQ_GET: cmdtype = "GET"; break;
120     case EVHTTP_REQ_POST: cmdtype = "POST"; break;
121     case EVHTTP_REQ_HEAD: cmdtype = "HEAD"; break;
122     case EVHTTP_REQ_PUT: cmdtype = "PUT"; break;
123     case EVHTTP_REQ_DELETE: cmdtype = "DELETE"; break;
124     case EVHTTP_REQ_OPTIONS: cmdtype = "OPTIONS"; break;
125     case EVHTTP_REQ_TRACE: cmdtype = "TRACE"; break;
126     case EVHTTP_REQ_CONNECT: cmdtype = "CONNECT"; break;
127     case EVHTTP_REQ_PATCH: cmdtype = "PATCH"; break;
128     default: cmdtype = "unknown"; break;
129     }
130 
131     printf("Received a %s request for %s\nHeaders:\n",
132         cmdtype, evhttp_request_get_uri(req));
133 
134     headers = evhttp_request_get_input_headers(req);
135     for (header = headers->tqh_first; header;
136         header = header->next.tqe_next) {
137         printf("  %s: %s\n", header->key, header->value);
138     }
139 
140     buf = evhttp_request_get_input_buffer(req);
141     puts("Input data: <<<");
142     while (evbuffer_get_length(buf)) {
143         int n;
144         char cbuf[128];
145         n = evbuffer_remove(buf, cbuf, sizeof(cbuf));
146         if (n > 0)
147             (void) fwrite(cbuf, 1, n, stdout);
148     }
149     puts(">>>");
150 
151     evhttp_send_reply(req, 200, "OK", NULL);
152 }
153 
154 /* This callback gets invoked when we get any http request that doesn't match
155  * any other callback.  Like any evhttp server callback, it has a simple job:
156  * it must eventually call evhttp_send_error() or evhttp_send_reply().
157  */
158 static void
159 send_document_cb(struct evhttp_request *req, void *arg)
160 {
161     struct evbuffer *evb = NULL;
162     const char *docroot = arg;
163     const char *uri = evhttp_request_get_uri(req);
164     struct evhttp_uri *decoded = NULL;
165     const char *path;
166     char *decoded_path;
167     char *whole_path = NULL;
168     size_t len;
169     int fd = -1;
170     struct stat st;
171 
172     if (evhttp_request_get_command(req) != EVHTTP_REQ_GET) {
173         dump_request_cb(req, arg);
174         return;
175     }
176 
177     printf("Got a GET request for <%s>\n",  uri);
178 
179     /* Decode the URI */
180     decoded = evhttp_uri_parse(uri);
181     if (!decoded) {
182         printf("It's not a good URI. Sending BADREQUEST\n");
183         evhttp_send_error(req, HTTP_BADREQUEST, 0);
184         return;
185     }
186 
187     /* Let's see what path the user asked for. */
188     path = evhttp_uri_get_path(decoded);
189     if (!path) path = "/";
190 
191     /* We need to decode it, to see what path the user really wanted. */
192     decoded_path = evhttp_uridecode(path, 0, NULL);
193     if (decoded_path == NULL)
194         goto err;
195     /* Don't allow any ".."s in the path, to avoid exposing stuff outside
196      * of the docroot.  This test is both overzealous and underzealous:
197      * it forbids aceptable paths like "/this/one..here", but it doesn't
198      * do anything to prevent symlink following." */
199     if (strstr(decoded_path, ".."))
200         goto err;
201 
202     len = strlen(decoded_path)+strlen(docroot)+2;
203     if (!(whole_path = malloc(len))) {
204         perror("malloc");
205         goto err;
206     }
207     evutil_snprintf(whole_path, len, "%s/%s", docroot, decoded_path);
208 
209     if (stat(whole_path, &st)<0) {
210         goto err;
211     }
212 
213     /* This holds the content we're sending. */
214     evb = evbuffer_new();
215 
216     if (S_ISDIR(st.st_mode)) {
217         /* If it's a directory, read the comments and make a little
218          * index page */
219 #ifdef _WIN32
220         HANDLE d;
221         WIN32_FIND_DATAA ent;
222         char *pattern;
223         size_t dirlen;
224 #else
225         DIR *d;
226         struct dirent *ent;
227 #endif
228         const char *trailing_slash = "";
229 
230         if (!strlen(path) || path[strlen(path)-1] != '/')
231             trailing_slash = "/";
232 
233 #ifdef _WIN32
234         dirlen = strlen(whole_path);
235         pattern = malloc(dirlen+3);
236         memcpy(pattern, whole_path, dirlen);
237         pattern[dirlen] = '\\';
238         pattern[dirlen+1] = '*';
239         pattern[dirlen+2] = '\0';
240         d = FindFirstFileA(pattern, &ent);
241         free(pattern);
242         if (d == INVALID_HANDLE_VALUE)
243             goto err;
244 #else
245         if (!(d = opendir(whole_path)))
246             goto err;
247 #endif
248 
249         evbuffer_add_printf(evb,
250                     "<!DOCTYPE html>\n"
251                     "<html>\n <head>\n"
252                     "  <meta charset='utf-8'>\n"
253             "  <title>%s</title>\n"
254             "  <base href='%s%s'>\n"
255             " </head>\n"
256             " <body>\n"
257             "  <h1>%s</h1>\n"
258             "  <ul>\n",
259             decoded_path, /* XXX html-escape this. */
260             path, /* XXX html-escape this? */
261             trailing_slash,
262             decoded_path /* XXX html-escape this */);
263 #ifdef _WIN32
264         do {
265             const char *name = ent.cFileName;
266 #else
267         while ((ent = readdir(d))) {
268             const char *name = ent->d_name;
269 #endif
270             evbuffer_add_printf(evb,
271                 "    <li><a href=\"%s\">%s</a>\n",
272                 name, name);/* XXX escape this */
273 #ifdef _WIN32
274         } while (FindNextFileA(d, &ent));
275 #else
276         }
277 #endif
278         evbuffer_add_printf(evb, "</ul></body></html>\n");
279 #ifdef _WIN32
280         FindClose(d);
281 #else
282         closedir(d);
283 #endif
284         evhttp_add_header(evhttp_request_get_output_headers(req),
285             "Content-Type", "text/html");
286     } else {
287         /* Otherwise it's a file; add it to the buffer to get
288          * sent via sendfile */
289         const char *type = guess_content_type(decoded_path);
290         if ((fd = open(whole_path, O_RDONLY)) < 0) {
291             perror("open");
292             goto err;
293         }
294 
295         if (fstat(fd, &st)<0) {
296             /* Make sure the length still matches, now that we
297              * opened the file :/ */
298             perror("fstat");
299             goto err;
300         }
301         evhttp_add_header(evhttp_request_get_output_headers(req),
302             "Content-Type", type);
303         evbuffer_add_file(evb, fd, 0, st.st_size);
304     }
305 
306     evhttp_send_reply(req, 200, "OK", evb);
307     goto done;
308 err:
309     evhttp_send_error(req, 404, "Document was not found");
310     if (fd>=0)
311         close(fd);
312 done:
313     if (decoded)
314         evhttp_uri_free(decoded);
315     if (decoded_path)
316         free(decoded_path);
317     if (whole_path)
318         free(whole_path);
319     if (evb)
320         evbuffer_free(evb);
321 }
322 
323 static void
324 syntax(void)
325 {
326     fprintf(stdout, "Syntax: http-server <docroot>\n");
327 }
328 
329 int
330 main(int argc, char **argv)
331 {
332     struct event_base *base;
333     struct evhttp *http;
334     struct evhttp_bound_socket *handle;
335 
336     unsigned short port = 0;
337 #ifdef _WIN32
338     WSADATA WSAData;
339     WSAStartup(0x101, &WSAData);
340 #else
341     if (signal(SIGPIPE, SIG_IGN) == SIG_ERR)
342         return (1);
343 #endif
344     if (argc < 2) {
345         syntax();
346         return 1;
347     }
348 
349     base = event_base_new();
350     if (!base) {
351         fprintf(stderr, "Couldn't create an event_base: exiting\n");
352         return 1;
353     }
354 
355     /* Create a new evhttp object to handle requests. */
356     http = evhttp_new(base);
357     if (!http) {
358         fprintf(stderr, "couldn't create evhttp. Exiting.\n");
359         return 1;
360     }
361 
362     /* The /dump URI will dump all requests to stdout and say 200 ok. */
363     evhttp_set_cb(http, "/dump", dump_request_cb, NULL);
364 
365     /* We want to accept arbitrary requests, so we need to set a "generic"
366      * cb.  We can also add callbacks for specific paths. */
367     evhttp_set_gencb(http, send_document_cb, argv[1]);
368 
369     /* Now we tell the evhttp what port to listen on */
370     handle = evhttp_bind_socket_with_handle(http, "0.0.0.0", port);
371     if (!handle) {
372         fprintf(stderr, "couldn't bind to port %d. Exiting.\n",
373             (int)port);
374         return 1;
375     }
376 
377     {
378         /* Extract and display the address we're listening on. */
379         struct sockaddr_storage ss;
380         evutil_socket_t fd;
381         ev_socklen_t socklen = sizeof(ss);
382         char addrbuf[128];
383         void *inaddr;
384         const char *addr;
385         int got_port = -1;
386         fd = evhttp_bound_socket_get_fd(handle);
387         memset(&ss, 0, sizeof(ss));
388         if (getsockname(fd, (struct sockaddr *)&ss, &socklen)) {
389             perror("getsockname() failed");
390             return 1;
391         }
392         if (ss.ss_family == AF_INET) {
393             got_port = ntohs(((struct sockaddr_in*)&ss)->sin_port);
394             inaddr = &((struct sockaddr_in*)&ss)->sin_addr;
395         } else if (ss.ss_family == AF_INET6) {
396             got_port = ntohs(((struct sockaddr_in6*)&ss)->sin6_port);
397             inaddr = &((struct sockaddr_in6*)&ss)->sin6_addr;
398         } else {
399             fprintf(stderr, "Weird address family %d\n",
400                 ss.ss_family);
401             return 1;
402         }
403         addr = evutil_inet_ntop(ss.ss_family, inaddr, addrbuf,
404             sizeof(addrbuf));
405         if (addr) {
406             printf("Listening on %s:%d\n", addr, got_port);
407             evutil_snprintf(uri_root, sizeof(uri_root),
408                 "http://%s:%d",addr,got_port);
409         } else {
410             fprintf(stderr, "evutil_inet_ntop failed\n");
411             return 1;
412         }
413     }
414 
415     event_base_dispatch(base);
416 
417     return 0;
418 }
View Code

　　g++ http-server.c -Iinclude -L. -levent -lws2_32

　　这样就可以当作服务器了。

　　

　　libevent编译后的库下载地址: https://files.cnblogs.com/files/wunaozai/libevent.zip

　　本文地址: http://www.cnblogs.com/wunaozai/p/4550084.html 

posted @ 2015-06-03 19:47  无脑仔的小明  阅读(3941)  评论(3)  编辑  收藏  举报