util-internal.h

   1 /*
   2  * Copyright (c) 2007-2012 Niels Provos and Nick Mathewson
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  * 3. The name of the author may not be used to endorse or promote products
  13  *    derived from this software without specific prior written permission.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  25  */
  26 #ifndef UTIL_INTERNAL_H_INCLUDED_
  27 #define UTIL_INTERNAL_H_INCLUDED_
  28
  29 #include "event2/event-config.h"
  30 #include "evconfig-private.h"
  31
  32 #include <errno.h>
  33
  34 /* For EVUTIL_ASSERT */
  35 #include "log-internal.h"
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #ifdef EVENT__HAVE_SYS_SOCKET_H
  39 #include <sys/socket.h>
  40 #endif
  41 #ifdef EVENT__HAVE_SYS_EVENTFD_H
  42 #include <sys/eventfd.h>
  43 #endif
  44 #include "event2/util.h"
  45
  46 #include "time-internal.h"
  47 #include "ipv6-internal.h"
  48
  49 #ifdef __cplusplus
  50 extern "C" {
  51 #endif
  52
  53 /* __has_attribute() wrapper */
  54 #ifdef __has_attribute
  55 #define EVUTIL_HAS_ATTRIBUTE __has_attribute
  56 #endif
  57 /** clang 3 __has_attribute misbehaves in some versions */
  58 #if defined(__clang__) && \
  59         __clang__ == 1 && __clang_major__ == 3 && \
  60         (__clang_minor__ >= 2 && __clang_minor__ <= 5)
  61 #undef EVUTIL_HAS_ATTRIBUTE
  62 #endif
  63 #ifndef EVUTIL_HAS_ATTRIBUTE
  64 #define EVUTIL_HAS_ATTRIBUTE(x) 0
  65 #endif
  66
  67 /* If we need magic to say "inline", get it for free internally. */
  68 #ifdef EVENT__inline
  69 #define inline EVENT__inline
  70 #endif
  71
  72 /* Define to appropriate substitute if compiler doesnt have __func__ */
  73 #if defined(EVENT__HAVE___func__)
  74 # ifndef __func__
  75 #  define __func__ __func__
  76 # endif
  77 #elif defined(EVENT__HAVE___FUNCTION__)
  78 # define __func__ __FUNCTION__
  79 #else
  80 # define __func__ __FILE__
  81 #endif
  82
  83 /* A good no-op to use in macro definitions. */
  84 #define EVUTIL_NIL_STMT_ ((void)0)
  85 /* A no-op that tricks the compiler into thinking a condition is used while
  86  * definitely not making any code for it.  Used to compile out asserts while
  87  * avoiding "unused variable" warnings.  The "!" forces the compiler to
  88  * do the sizeof() on an int, in case "condition" is a bitfield value.
  89  */
  90 #define EVUTIL_NIL_CONDITION_(condition) do { \
  91         (void)sizeof(!(condition));  \
  92 } while(0)
  93
  94 /* Internal use only: macros to match patterns of error codes in a
  95    cross-platform way.  We need these macros because of two historical
  96    reasons: first, nonblocking IO functions are generally written to give an
  97    error on the "blocked now, try later" case, so sometimes an error from a
  98    read, write, connect, or accept means "no error; just wait for more
  99    data," and we need to look at the error code.  Second, Windows defines
 100    a different set of error codes for sockets. */
 101
 102 #ifndef _WIN32
 103
 104 #if EAGAIN == EWOULDBLOCK
 105 #define EVUTIL_ERR_IS_EAGAIN(e) \
 106         ((e) == EAGAIN)
 107 #else
 108 #define EVUTIL_ERR_IS_EAGAIN(e) \
 109         ((e) == EAGAIN || (e) == EWOULDBLOCK)
 110 #endif
 111
 112 /* True iff e is an error that means a read/write operation can be retried. */
 113 #define EVUTIL_ERR_RW_RETRIABLE(e)                              \
 114         ((e) == EINTR || EVUTIL_ERR_IS_EAGAIN(e))
 115 /* True iff e is an error that means an connect can be retried. */
 116 #define EVUTIL_ERR_CONNECT_RETRIABLE(e)                 \
 117         ((e) == EINTR || (e) == EINPROGRESS)
 118 /* True iff e is an error that means a accept can be retried. */
 119 #define EVUTIL_ERR_ACCEPT_RETRIABLE(e)                  \
 120         ((e) == EINTR || EVUTIL_ERR_IS_EAGAIN(e) || (e) == ECONNABORTED)
 121
 122 /* True iff e is an error that means the connection was refused */
 123 #define EVUTIL_ERR_CONNECT_REFUSED(e)                                   \
 124         ((e) == ECONNREFUSED)
 125
 126 #else
 127 /* Win32 */
 128
 129 #define EVUTIL_ERR_IS_EAGAIN(e) \
 130         ((e) == WSAEWOULDBLOCK || (e) == EAGAIN)
 131
 132 #define EVUTIL_ERR_RW_RETRIABLE(e)                                      \
 133         ((e) == WSAEWOULDBLOCK ||                                       \
 134             (e) == WSAEINTR)
 135
 136 #define EVUTIL_ERR_CONNECT_RETRIABLE(e)                                 \
 137         ((e) == WSAEWOULDBLOCK ||                                       \
 138             (e) == WSAEINTR ||                                          \
 139             (e) == WSAEINPROGRESS ||                                    \
 140             (e) == WSAEINVAL)
 141
 142 #define EVUTIL_ERR_ACCEPT_RETRIABLE(e)                  \
 143         EVUTIL_ERR_RW_RETRIABLE(e)
 144
 145 #define EVUTIL_ERR_CONNECT_REFUSED(e)                                   \
 146         ((e) == WSAECONNREFUSED)
 147
 148 #endif
 149
 150 /* Arguments for shutdown() */
 151 #ifdef SHUT_RD
 152 #define EVUTIL_SHUT_RD SHUT_RD
 153 #else
 154 #define EVUTIL_SHUT_RD 0
 155 #endif
 156 #ifdef SHUT_WR
 157 #define EVUTIL_SHUT_WR SHUT_WR
 158 #else
 159 #define EVUTIL_SHUT_WR 1 /* SD_SEND */
 160 #endif
 161 #ifdef SHUT_BOTH
 162 #define EVUTIL_SHUT_BOTH SHUT_BOTH
 163 #else
 164 #define EVUTIL_SHUT_BOTH 2
 165 #endif
 166
 167 /* Helper: Verify that all the elements in 'dlist' are internally consistent.
 168  * Checks for circular lists and bad prev/next pointers.
 169  *
 170  * Example usage:
 171  *    EVUTIL_ASSERT_LIST_OK(eventlist, event, ev_next);
 172  */
 173 #define EVUTIL_ASSERT_LIST_OK(dlist, type, field) do {                  \
 174                 struct type *elm1, *elm2, **nextp;                      \
 175                 if (LIST_EMPTY((dlist)))                                \
 176                         break;                                          \
 177                                                                         \
 178                 /* Check list for circularity using Floyd's */          \
 179                 /* 'Tortoise and Hare' algorithm */                     \
 180                 elm1 = LIST_FIRST((dlist));                             \
 181                 elm2 = LIST_NEXT(elm1, field);                          \
 182                 while (elm1 && elm2) {                                  \
 183                         EVUTIL_ASSERT(elm1 != elm2);                    \
 184                         elm1 = LIST_NEXT(elm1, field);                  \
 185                         elm2 = LIST_NEXT(elm2, field);                  \
 186                         if (!elm2)                                      \
 187                                 break;                                  \
 188                         EVUTIL_ASSERT(elm1 != elm2);                    \
 189                         elm2 = LIST_NEXT(elm2, field);                  \
 190                 }                                                       \
 191                                                                         \
 192                 /* Now check next and prev pointers for consistency. */ \
 193                 nextp = &LIST_FIRST((dlist));                           \
 194                 elm1 = LIST_FIRST((dlist));                             \
 195                 while (elm1) {                                          \
 196                         EVUTIL_ASSERT(*nextp == elm1);                  \
 197                         EVUTIL_ASSERT(nextp == elm1->field.le_prev);    \
 198                         nextp = &LIST_NEXT(elm1, field);                \
 199                         elm1 = *nextp;                                  \
 200                 }                                                       \
 201         } while (0)
 202
 203 /* Helper: Verify that all the elements in a TAILQ are internally consistent.
 204  * Checks for circular lists and bad prev/next pointers.
 205  *
 206  * Example usage:
 207  *    EVUTIL_ASSERT_TAILQ_OK(activelist, event, ev_active_next);
 208  */
 209 #define EVUTIL_ASSERT_TAILQ_OK(tailq, type, field) do {                 \
 210                 struct type *elm1, *elm2, **nextp;                      \
 211                 if (TAILQ_EMPTY((tailq)))                               \
 212                         break;                                          \
 213                                                                         \
 214                 /* Check list for circularity using Floyd's */          \
 215                 /* 'Tortoise and Hare' algorithm */                     \
 216                 elm1 = TAILQ_FIRST((tailq));                            \
 217                 elm2 = TAILQ_NEXT(elm1, field);                         \
 218                 while (elm1 && elm2) {                                  \
 219                         EVUTIL_ASSERT(elm1 != elm2);                    \
 220                         elm1 = TAILQ_NEXT(elm1, field);                 \
 221                         elm2 = TAILQ_NEXT(elm2, field);                 \
 222                         if (!elm2)                                      \
 223                                 break;                                  \
 224                         EVUTIL_ASSERT(elm1 != elm2);                    \
 225                         elm2 = TAILQ_NEXT(elm2, field);                 \
 226                 }                                                       \
 227                                                                         \
 228                 /* Now check next and prev pointers for consistency. */ \
 229                 nextp = &TAILQ_FIRST((tailq));                          \
 230                 elm1 = TAILQ_FIRST((tailq));                            \
 231                 while (elm1) {                                          \
 232                         EVUTIL_ASSERT(*nextp == elm1);                  \
 233                         EVUTIL_ASSERT(nextp == elm1->field.tqe_prev);   \
 234                         nextp = &TAILQ_NEXT(elm1, field);               \
 235                         elm1 = *nextp;                                  \
 236                 }                                                       \
 237                 EVUTIL_ASSERT(nextp == (tailq)->tqh_last);              \
 238         } while (0)
 239
 240 /* Locale-independent replacements for some ctypes functions.  Use these
 241  * when you care about ASCII's notion of character types, because you are about
 242  * to send those types onto the wire.
 243  */
 244 EVENT2_EXPORT_SYMBOL
 245 int EVUTIL_ISALPHA_(char c);
 246 EVENT2_EXPORT_SYMBOL
 247 int EVUTIL_ISALNUM_(char c);
 248 int EVUTIL_ISSPACE_(char c);
 249 EVENT2_EXPORT_SYMBOL
 250 int EVUTIL_ISDIGIT_(char c);
 251 EVENT2_EXPORT_SYMBOL
 252 int EVUTIL_ISXDIGIT_(char c);
 253 int EVUTIL_ISPRINT_(char c);
 254 int EVUTIL_ISLOWER_(char c);
 255 int EVUTIL_ISUPPER_(char c);
 256 EVENT2_EXPORT_SYMBOL
 257 char EVUTIL_TOUPPER_(char c);
 258 EVENT2_EXPORT_SYMBOL
 259 char EVUTIL_TOLOWER_(char c);
 260
 261 /** Remove all trailing horizontal whitespace (space or tab) from the end of a
 262  * string */
 263 EVENT2_EXPORT_SYMBOL
 264 void evutil_rtrim_lws_(char *);
 265
 266
 267 /** Helper macro.  If we know that a given pointer points to a field in a
 268     structure, return a pointer to the structure itself.  Used to implement
 269     our half-baked C OO.  Example:
 270
 271     struct subtype {
 272         int x;
 273         struct supertype common;
 274         int y;
 275     };
 276     ...
 277     void fn(struct supertype *super) {
 278         struct subtype *sub = EVUTIL_UPCAST(super, struct subtype, common);
 279         ...
 280     }
 281  */
 282 #define EVUTIL_UPCAST(ptr, type, field)                         \
 283         ((type *)(((char*)(ptr)) - evutil_offsetof(type, field)))
 284
 285 /* As open(pathname, flags, mode), except that the file is always opened with
 286  * the close-on-exec flag set. (And the mode argument is mandatory.)
 287  */
 288 int evutil_open_closeonexec_(const char *pathname, int flags, unsigned mode);
 289
 290 EVENT2_EXPORT_SYMBOL
 291 int evutil_read_file_(const char *filename, char **content_out, size_t *len_out,
 292     int is_binary);
 293
 294 EVENT2_EXPORT_SYMBOL
 295 int evutil_socket_connect_(evutil_socket_t *fd_ptr, const struct sockaddr *sa, int socklen);
 296
 297 int evutil_socket_finished_connecting_(evutil_socket_t fd);
 298
 299 EVENT2_EXPORT_SYMBOL
 300 int evutil_ersatz_socketpair_(int, int , int, evutil_socket_t[]);
 301
 302 int evutil_resolve_(int family, const char *hostname, struct sockaddr *sa,
 303     ev_socklen_t *socklen, int port);
 304
 305 const char *evutil_getenv_(const char *name);
 306
 307 /* Structure to hold the state of our weak random number generator.
 308  */
 309 struct evutil_weakrand_state {
 310         ev_uint32_t seed;
 311 };
 312
 313 #define EVUTIL_WEAKRAND_MAX EV_INT32_MAX
 314
 315 /* Initialize the state of a week random number generator based on 'seed'.  If
 316  * the seed is 0, construct a new seed based on not-very-strong platform
 317  * entropy, like the PID and the time of day.
 318  *
 319  * This function, and the other evutil_weakrand* functions, are meant for
 320  * speed, not security or statistical strength.  If you need a RNG which an
 321  * attacker can't predict, or which passes strong statistical tests, use the
 322  * evutil_secure_rng* functions instead.
 323  */
 324 EVENT2_EXPORT_SYMBOL
 325 ev_uint32_t evutil_weakrand_seed_(struct evutil_weakrand_state *state, ev_uint32_t seed);
 326 /* Return a pseudorandom value between 0 and EVUTIL_WEAKRAND_MAX inclusive.
 327  * Updates the state in 'seed' as needed -- this value must be protected by a
 328  * lock.
 329  */
 330 EVENT2_EXPORT_SYMBOL
 331 ev_int32_t evutil_weakrand_(struct evutil_weakrand_state *seed);
 332 /* Return a pseudorandom value x such that 0 <= x < top. top must be no more
 333  * than EVUTIL_WEAKRAND_MAX. Updates the state in 'seed' as needed -- this
 334  * value must be proteced by a lock */
 335 EVENT2_EXPORT_SYMBOL
 336 ev_int32_t evutil_weakrand_range_(struct evutil_weakrand_state *seed, ev_int32_t top);
 337
 338 /* Evaluates to the same boolean value as 'p', and hints to the compiler that
 339  * we expect this value to be false. */
 340 #if defined(__GNUC__) && __GNUC__ >= 3         /* gcc 3.0 or later */
 341 #define EVUTIL_UNLIKELY(p) __builtin_expect(!!(p),0)
 342 #else
 343 #define EVUTIL_UNLIKELY(p) (p)
 344 #endif
 345
 346 #if EVUTIL_HAS_ATTRIBUTE(fallthrough)
 347 #define EVUTIL_FALLTHROUGH __attribute__((fallthrough))
 348 #else
 349 #define EVUTIL_FALLTHROUGH /* fallthrough */
 350 #endif
 351
 352 /* Replacement for assert() that calls event_errx on failure. */
 353 #ifdef NDEBUG
 354 #define EVUTIL_ASSERT(cond) EVUTIL_NIL_CONDITION_(cond)
 355 #define EVUTIL_FAILURE_CHECK(cond) 0
 356 #else
 357 #define EVUTIL_ASSERT(cond)                                             \
 358         do {                                                            \
 359                 if (EVUTIL_UNLIKELY(!(cond))) {                         \
 360                         event_errx(EVENT_ERR_ABORT_,                    \
 361                             "%s:%d: Assertion %s failed in %s",         \
 362                             __FILE__,__LINE__,#cond,__func__);          \
 363                         /* In case a user-supplied handler tries to */  \
 364                         /* return control to us, log and abort here. */ \
 365                         (void)fprintf(stderr,                           \
 366                             "%s:%d: Assertion %s failed in %s",         \
 367                             __FILE__,__LINE__,#cond,__func__);          \
 368                         abort();                                        \
 369                 }                                                       \
 370         } while (0)
 371 #define EVUTIL_FAILURE_CHECK(cond) EVUTIL_UNLIKELY(cond)
 372 #endif
 373
 374 #ifndef EVENT__HAVE_STRUCT_SOCKADDR_STORAGE
 375 /* Replacement for sockaddr storage that we can use internally on platforms
 376  * that lack it.  It is not space-efficient, but neither is sockaddr_storage.
 377  */
 378 struct sockaddr_storage {
 379         union {
 380                 struct sockaddr ss_sa;
 381                 struct sockaddr_in ss_sin;
 382                 struct sockaddr_in6 ss_sin6;
 383                 char ss_padding[128];
 384         } ss_union;
 385 };
 386 #define ss_family ss_union.ss_sa.sa_family
 387 #endif
 388
 389 /* Internal addrinfo error code.  This one is returned from only from
 390  * evutil_getaddrinfo_common_, when we are sure that we'll have to hit a DNS
 391  * server. */
 392 #define EVUTIL_EAI_NEED_RESOLVE      -90002
 393
 394 struct evdns_base;
 395 struct evdns_getaddrinfo_request;
 396 typedef struct evdns_getaddrinfo_request* (*evdns_getaddrinfo_fn)(
 397     struct evdns_base *base,
 398     const char *nodename, const char *servname,
 399     const struct evutil_addrinfo *hints_in,
 400     void (*cb)(int, struct evutil_addrinfo *, void *), void *arg);
 401 EVENT2_EXPORT_SYMBOL
 402 void evutil_set_evdns_getaddrinfo_fn_(evdns_getaddrinfo_fn fn);
 403 typedef void (*evdns_getaddrinfo_cancel_fn)(
 404     struct evdns_getaddrinfo_request *req);
 405 EVENT2_EXPORT_SYMBOL
 406 void evutil_set_evdns_getaddrinfo_cancel_fn_(evdns_getaddrinfo_cancel_fn fn);
 407
 408 EVENT2_EXPORT_SYMBOL
 409 struct evutil_addrinfo *evutil_new_addrinfo_(struct sockaddr *sa,
 410     ev_socklen_t socklen, const struct evutil_addrinfo *hints);
 411 EVENT2_EXPORT_SYMBOL
 412 struct evutil_addrinfo *evutil_addrinfo_append_(struct evutil_addrinfo *first,
 413     struct evutil_addrinfo *append);
 414 EVENT2_EXPORT_SYMBOL
 415 void evutil_adjust_hints_for_addrconfig_(struct evutil_addrinfo *hints);
 416 EVENT2_EXPORT_SYMBOL
 417 int evutil_getaddrinfo_common_(const char *nodename, const char *servname,
 418     struct evutil_addrinfo *hints, struct evutil_addrinfo **res, int *portnum);
 419
 420 struct evdns_getaddrinfo_request *evutil_getaddrinfo_async_(
 421     struct evdns_base *dns_base,
 422     const char *nodename, const char *servname,
 423     const struct evutil_addrinfo *hints_in,
 424     void (*cb)(int, struct evutil_addrinfo *, void *), void *arg);
 425 void evutil_getaddrinfo_cancel_async_(struct evdns_getaddrinfo_request *data);
 426
 427 /** Return true iff sa is a looback address. (That is, it is 127.0.0.1/8, or
 428  * ::1). */
 429 EVENT2_EXPORT_SYMBOL
 430 int evutil_sockaddr_is_loopback_(const struct sockaddr *sa);
 431
 432
 433 /**
 434     Formats a sockaddr sa into a string buffer of size outlen stored in out.
 435     Returns a pointer to out.  Always writes something into out, so it's safe
 436     to use the output of this function without checking it for NULL.
 437  */
 438 EVENT2_EXPORT_SYMBOL
 439 const char *evutil_format_sockaddr_port_(const struct sockaddr *sa, char *out, size_t outlen);
 440
 441 int evutil_hex_char_to_int_(char c);
 442
 443
 444 void evutil_free_secure_rng_globals_(void);
 445 void evutil_free_globals_(void);
 446
 447 #ifdef _WIN32
 448 EVENT2_EXPORT_SYMBOL
 449 HMODULE evutil_load_windows_system_library_(const TCHAR *library_name);
 450 #endif
 451
 452 #ifndef EV_SIZE_FMT
 453 #if defined(_MSC_VER) || defined(__MINGW32__) || defined(__MINGW64__)
 454 #define EV_U64_FMT "%I64u"
 455 #define EV_I64_FMT "%I64d"
 456 #define EV_I64_ARG(x) ((__int64)(x))
 457 #define EV_U64_ARG(x) ((unsigned __int64)(x))
 458 #else
 459 #define EV_U64_FMT "%llu"
 460 #define EV_I64_FMT "%lld"
 461 #define EV_I64_ARG(x) ((long long)(x))
 462 #define EV_U64_ARG(x) ((unsigned long long)(x))
 463 #endif
 464 #endif
 465
 466 #ifdef _WIN32
 467 #define EV_SOCK_FMT EV_I64_FMT
 468 #define EV_SOCK_ARG(x) EV_I64_ARG((x))
 469 #else
 470 #define EV_SOCK_FMT "%d"
 471 #define EV_SOCK_ARG(x) (x)
 472 #endif
 473
 474 #if defined(__STDC__) && defined(__STDC_VERSION__) && !defined(__MINGW64_VERSION_MAJOR)
 475 #if (__STDC_VERSION__ >= 199901L)
 476 #define EV_SIZE_FMT "%zu"
 477 #define EV_SSIZE_FMT "%zd"
 478 #define EV_SIZE_ARG(x) (x)
 479 #define EV_SSIZE_ARG(x) (x)
 480 #endif
 481 #endif
 482
 483 #ifndef EV_SIZE_FMT
 484 #if (EVENT__SIZEOF_SIZE_T <= EVENT__SIZEOF_LONG)
 485 #define EV_SIZE_FMT "%lu"
 486 #define EV_SSIZE_FMT "%ld"
 487 #define EV_SIZE_ARG(x) ((unsigned long)(x))
 488 #define EV_SSIZE_ARG(x) ((long)(x))
 489 #else
 490 #define EV_SIZE_FMT EV_U64_FMT
 491 #define EV_SSIZE_FMT EV_I64_FMT
 492 #define EV_SIZE_ARG(x) EV_U64_ARG(x)
 493 #define EV_SSIZE_ARG(x) EV_I64_ARG(x)
 494 #endif
 495 #endif
 496
 497 EVENT2_EXPORT_SYMBOL
 498 evutil_socket_t evutil_socket_(int domain, int type, int protocol);
 499 evutil_socket_t evutil_accept4_(evutil_socket_t sockfd, struct sockaddr *addr,
 500     ev_socklen_t *addrlen, int flags);
 501
 502     /* used by one of the test programs.. */
 503 EVENT2_EXPORT_SYMBOL
 504 int evutil_make_internal_pipe_(evutil_socket_t fd[2]);
 505 evutil_socket_t evutil_eventfd_(unsigned initval, int flags);
 506
 507 #ifdef SOCK_NONBLOCK
 508 #define EVUTIL_SOCK_NONBLOCK SOCK_NONBLOCK
 509 #else
 510 #define EVUTIL_SOCK_NONBLOCK 0x4000000
 511 #endif
 512 #ifdef SOCK_CLOEXEC
 513 #define EVUTIL_SOCK_CLOEXEC SOCK_CLOEXEC
 514 #else
 515 #define EVUTIL_SOCK_CLOEXEC 0x80000000
 516 #endif
 517 #ifdef EFD_NONBLOCK
 518 #define EVUTIL_EFD_NONBLOCK EFD_NONBLOCK
 519 #else
 520 #define EVUTIL_EFD_NONBLOCK 0x4000
 521 #endif
 522 #ifdef EFD_CLOEXEC
 523 #define EVUTIL_EFD_CLOEXEC EFD_CLOEXEC
 524 #else
 525 #define EVUTIL_EFD_CLOEXEC 0x8000
 526 #endif
 527
 528 void evutil_memclear_(void *mem, size_t len);
 529
 530 struct in_addr;
 531 struct in6_addr;
 532
 533 /* This is a any, loopback, link-local, multicast */
 534 EVENT2_EXPORT_SYMBOL
 535 int evutil_v4addr_is_local_(const struct in_addr *in);
 536 /* This is a reserved, ipv4compat, ipv4map, loopback,
 537  * link-local, multicast, or unspecified address. */
 538 EVENT2_EXPORT_SYMBOL
 539 int evutil_v6addr_is_local_(const struct in6_addr *in);
 540
 541 #ifdef __cplusplus
 542 }
 543 #endif
 544
 545 #endif