GNU libmicrohttpd 0.9.77
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mhd_itc.h
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1/*
2 This file is part of libmicrohttpd
3 Copyright (C) 2016 Karlson2k (Evgeny Grin)
4
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 This library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with this library; if not, write to the Free Software
17 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18
19*/
20
33#ifndef MHD_ITC_H
34#define MHD_ITC_H 1
35#include "mhd_itc_types.h"
36
37#include <fcntl.h>
38
39#ifndef MHD_PANIC
40# include <stdio.h>
41# include <stdlib.h>
42/* Simple implementation of MHD_PANIC, to be used outside lib */
43# define MHD_PANIC(msg) do { fprintf (stderr, \
44 "Abnormal termination at %d line in file %s: %s\n", \
45 (int) __LINE__, __FILE__, msg); abort (); \
46} while (0)
47#endif /* ! MHD_PANIC */
48
49#if defined(_MHD_ITC_EVENTFD)
50
51/* **************** Optimized GNU/Linux ITC implementation by eventfd ********** */
52#include <sys/eventfd.h>
53#include <stdint.h> /* for uint64_t */
54#ifdef HAVE_UNISTD_H
55#include <unistd.h> /* for read(), write(), errno */
56#endif /* HAVE_UNISTD_H */
57#ifdef HAVE_STRING_H
58#include <string.h> /* for strerror() */
59#endif
60
61
67#define MHD_itc_init_(itc) (-1 != ((itc).fd = eventfd (0, EFD_CLOEXEC \
68 | EFD_NONBLOCK)))
69
73#define MHD_itc_last_strerror_() strerror (errno)
74
78static const uint64_t _MHD_itc_wr_data = 1;
79
86#define MHD_itc_activate_(itc, str) \
87 ((write ((itc).fd, (const void*) &_MHD_itc_wr_data, 8) > 0) || (EAGAIN == \
88 errno))
89
95#define MHD_itc_r_fd_(itc) ((itc).fd)
96
102#define MHD_itc_w_fd_(itc) ((itc).fd)
103
108#define MHD_itc_clear_(itc) \
109 do { uint64_t __b; int __r; \
110 __r = read ((itc).fd, &__b, sizeof(__b)); \
111 (void) __r; } while (0)
112
120#define MHD_itc_destroy_(itc) ((0 == close ((itc).fd)) || (EBADF != errno))
121
131#define MHD_ITC_IS_VALID_(itc) (-1 != ((itc).fd))
132
137#define MHD_itc_set_invalid_(itc) ((itc).fd = -1)
138
139
140#elif defined(_MHD_ITC_PIPE)
141
142/* **************** Standard UNIX ITC implementation by pipe ********** */
143
144#if defined(HAVE_PIPE2_FUNC) && defined(HAVE_FCNTL_H)
145# include <fcntl.h> /* for O_CLOEXEC, O_NONBLOCK */
146#endif /* HAVE_PIPE2_FUNC && HAVE_FCNTL_H */
147#ifdef HAVE_UNISTD_H
148#include <unistd.h> /* for read(), write(), errno */
149#endif /* HAVE_UNISTD_H */
150#ifdef HAVE_STRING_H
151#include <string.h> /* for strerror() */
152#endif
153
154
160#ifdef HAVE_PIPE2_FUNC
161# define MHD_itc_init_(itc) (! pipe2 ((itc).fd, O_CLOEXEC | O_NONBLOCK))
162#else /* ! HAVE_PIPE2_FUNC */
163# define MHD_itc_init_(itc) \
164 ( (! pipe ((itc).fd)) ? \
165 (MHD_itc_nonblocking_ ((itc)) ? \
166 (! 0) : \
167 (MHD_itc_destroy_ ((itc)), 0) ) \
168 : (0) )
169#endif /* ! HAVE_PIPE2_FUNC */
170
174#define MHD_itc_last_strerror_() strerror (errno)
175
182#define MHD_itc_activate_(itc, str) \
183 ((write ((itc).fd[1], (const void*) (str), 1) > 0) || (EAGAIN == errno))
184
185
191#define MHD_itc_r_fd_(itc) ((itc).fd[0])
192
198#define MHD_itc_w_fd_(itc) ((itc).fd[1])
199
204#define MHD_itc_clear_(itc) do \
205 { long __b; \
206 while (0 < read ((itc).fd[0], &__b, sizeof(__b))) \
207 {} } while (0)
208
214#define MHD_itc_destroy_(itc) \
215 ( (0 == close ((itc).fd[0])) ? \
216 (0 == close ((itc).fd[1])) : \
217 ((close ((itc).fd[1])), 0) )
218
228#define MHD_ITC_IS_VALID_(itc) (-1 != (itc).fd[0])
229
234#define MHD_itc_set_invalid_(itc) ((itc).fd[0] = (itc).fd[1] = -1)
235
236#ifndef HAVE_PIPE2_FUNC
243int
244MHD_itc_nonblocking_ (struct MHD_itc_ itc);
245
246#endif /* ! HAVE_PIPE2_FUNC */
247
248
249#elif defined(_MHD_ITC_SOCKETPAIR)
250
251/* **************** ITC implementation by socket pair ********** */
252
253#include "mhd_sockets.h"
254
255
261#ifdef MHD_socket_pair_nblk_
262# define MHD_itc_init_(itc) MHD_socket_pair_nblk_ ((itc).sk)
263#else /* ! MHD_socket_pair_nblk_ */
264# define MHD_itc_init_(itc) \
265 (MHD_socket_pair_ ((itc).sk) ? \
266 (MHD_itc_nonblocking_ ((itc)) ? \
267 (! 0) : \
268 (MHD_itc_destroy_ ((itc)), 0) ) \
269 : (0))
270#endif /* ! MHD_socket_pair_nblk_ */
271
275#define MHD_itc_last_strerror_() MHD_socket_last_strerr_ ()
276
283#define MHD_itc_activate_(itc, str) \
284 ((MHD_send_ ((itc).sk[1], (str), 1) > 0) || \
285 (MHD_SCKT_ERR_IS_EAGAIN_ (MHD_socket_get_error_ ())))
286
292#define MHD_itc_r_fd_(itc) ((itc).sk[0])
293
299#define MHD_itc_w_fd_(itc) ((itc).sk[1])
300
305#define MHD_itc_clear_(itc) do \
306 { long __b; \
307 while (0 < recv ((itc).sk[0], \
308 (char*) &__b, \
309 sizeof(__b), 0)) \
310 {} } while (0)
311
317#define MHD_itc_destroy_(itc) \
318 (MHD_socket_close_ ((itc).sk[0]) ? \
319 MHD_socket_close_ ((itc).sk[1]) : \
320 ((void) MHD_socket_close_ ((itc).sk[1]), 0) )
321
322
332#define MHD_ITC_IS_VALID_(itc) (MHD_INVALID_SOCKET != (itc).sk[0])
333
338#define MHD_itc_set_invalid_(itc) ((itc).sk[0] = (itc).sk[1] = \
339 MHD_INVALID_SOCKET)
340
341#ifndef MHD_socket_pair_nblk_
342# define MHD_itc_nonblocking_(pip) (MHD_socket_nonblocking_ ((pip).sk[0]) && \
343 MHD_socket_nonblocking_ ((pip).sk[1]))
344#endif /* ! MHD_socket_pair_nblk_ */
345
346#endif /* _MHD_ITC_SOCKETPAIR */
347
353#define MHD_itc_destroy_chk_(itc) do { \
354 if (! MHD_itc_destroy_ (itc)) \
355 MHD_PANIC (_ ("Failed to destroy ITC.\n")); \
356} while (0)
357
367#define MHD_ITC_IS_INVALID_(itc) (! MHD_ITC_IS_VALID_ (itc))
368
369#endif /* MHD_ITC_H */
Types for platform-independent inter-thread communication.