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kc3-lang/libevent/util-internal.h
Azat Khuzhin
- util-internal.h
-
/* * Copyright (c) 2007-2012 Niels Provos and Nick Mathewson * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #ifndef UTIL_INTERNAL_H_INCLUDED_ #define UTIL_INTERNAL_H_INCLUDED_ #include "event2/event-config.h" #include "evconfig-private.h" #include <errno.h> /* For EVUTIL_ASSERT */ #include "log-internal.h" #include <stdio.h> #include <stdlib.h> #ifdef EVENT__HAVE_SYS_SOCKET_H #include <sys/socket.h> #endif #ifdef EVENT__HAVE_SYS_EVENTFD_H #include <sys/eventfd.h> #endif #include "event2/util.h" #include "time-internal.h" #include "ipv6-internal.h" #ifdef __cplusplus extern "C" { #endif /* __has_attribute() wrapper */ #ifdef __has_attribute # define EVUTIL_HAS_ATTRIBUTE __has_attribute #endif /** clang 3 __has_attribute misbehaves in some versions */ #if defined(__clang__) && __clang__ == 1 # if defined(__apple_build_version__) # if __clang_major__ <= 6 # undef EVUTIL_HAS_ATTRIBUTE # endif # else /* !__apple_build_version__ */ # if __clang_major__ == 3 && __clang_minor__ >= 2 && __clang_minor__ <= 5 # undef EVUTIL_HAS_ATTRIBUTE # endif # endif /* __apple_build_version__ */ #endif /*\ defined(__clang__) && __clang__ == 1 */ #ifndef EVUTIL_HAS_ATTRIBUTE # define EVUTIL_HAS_ATTRIBUTE(x) 0 #endif /* If we need magic to say "inline", get it for free internally. */ #ifdef EVENT__inline #define inline EVENT__inline #endif /* Define to appropriate substitute if compiler doesnt have __func__ */ #if defined(EVENT__HAVE___func__) # ifndef __func__ # define __func__ __func__ # endif #elif defined(EVENT__HAVE___FUNCTION__) # define __func__ __FUNCTION__ #else # define __func__ __FILE__ #endif /* A good no-op to use in macro definitions. */ #define EVUTIL_NIL_STMT_ ((void)0) /* A no-op that tricks the compiler into thinking a condition is used while * definitely not making any code for it. Used to compile out asserts while * avoiding "unused variable" warnings. The "!" forces the compiler to * do the sizeof() on an int, in case "condition" is a bitfield value. */ #define EVUTIL_NIL_CONDITION_(condition) do { \ (void)sizeof(!(condition)); \ } while(0) /* Internal use only: macros to match patterns of error codes in a cross-platform way. We need these macros because of two historical reasons: first, nonblocking IO functions are generally written to give an error on the "blocked now, try later" case, so sometimes an error from a read, write, connect, or accept means "no error; just wait for more data," and we need to look at the error code. Second, Windows defines a different set of error codes for sockets. */ #ifndef _WIN32 #if EAGAIN == EWOULDBLOCK #define EVUTIL_ERR_IS_EAGAIN(e) \ ((e) == EAGAIN) #else #define EVUTIL_ERR_IS_EAGAIN(e) \ ((e) == EAGAIN || (e) == EWOULDBLOCK) #endif /* True iff e is an error that means a read/write operation can be retried. */ #define EVUTIL_ERR_RW_RETRIABLE(e) \ ((e) == EINTR || EVUTIL_ERR_IS_EAGAIN(e)) /* True iff e is an error that means an connect can be retried. */ #define EVUTIL_ERR_CONNECT_RETRIABLE(e) \ ((e) == EINTR || (e) == EINPROGRESS) /* True iff e is an error that means a accept can be retried. */ #define EVUTIL_ERR_ACCEPT_RETRIABLE(e) \ ((e) == EINTR || EVUTIL_ERR_IS_EAGAIN(e) || (e) == ECONNABORTED) /* True iff e is an error that means the connection was refused */ #define EVUTIL_ERR_CONNECT_REFUSED(e) \ ((e) == ECONNREFUSED) #else /* Win32 */ #define EVUTIL_ERR_IS_EAGAIN(e) \ ((e) == WSAEWOULDBLOCK || (e) == EAGAIN) #define EVUTIL_ERR_RW_RETRIABLE(e) \ ((e) == WSAEWOULDBLOCK || \ (e) == WSAEINTR) #define EVUTIL_ERR_CONNECT_RETRIABLE(e) \ ((e) == WSAEWOULDBLOCK || \ (e) == WSAEINTR || \ (e) == WSAEINPROGRESS || \ (e) == WSAEINVAL) #define EVUTIL_ERR_ACCEPT_RETRIABLE(e) \ EVUTIL_ERR_RW_RETRIABLE(e) #define EVUTIL_ERR_CONNECT_REFUSED(e) \ ((e) == WSAECONNREFUSED) #endif /* Arguments for shutdown() */ #ifdef SHUT_RD #define EVUTIL_SHUT_RD SHUT_RD #else #define EVUTIL_SHUT_RD 0 #endif #ifdef SHUT_WR #define EVUTIL_SHUT_WR SHUT_WR #else #define EVUTIL_SHUT_WR 1 /* SD_SEND */ #endif #ifdef SHUT_BOTH #define EVUTIL_SHUT_BOTH SHUT_BOTH #else #define EVUTIL_SHUT_BOTH 2 #endif /* Helper: Verify that all the elements in 'dlist' are internally consistent. * Checks for circular lists and bad prev/next pointers. * * Example usage: * EVUTIL_ASSERT_LIST_OK(eventlist, event, ev_next); */ #define EVUTIL_ASSERT_LIST_OK(dlist, type, field) do { \ struct type *elm1, *elm2, **nextp; \ if (LIST_EMPTY((dlist))) \ break; \ \ /* Check list for circularity using Floyd's */ \ /* 'Tortoise and Hare' algorithm */ \ elm1 = LIST_FIRST((dlist)); \ elm2 = LIST_NEXT(elm1, field); \ while (elm1 && elm2) { \ EVUTIL_ASSERT(elm1 != elm2); \ elm1 = LIST_NEXT(elm1, field); \ elm2 = LIST_NEXT(elm2, field); \ if (!elm2) \ break; \ EVUTIL_ASSERT(elm1 != elm2); \ elm2 = LIST_NEXT(elm2, field); \ } \ \ /* Now check next and prev pointers for consistency. */ \ nextp = &LIST_FIRST((dlist)); \ elm1 = LIST_FIRST((dlist)); \ while (elm1) { \ EVUTIL_ASSERT(*nextp == elm1); \ EVUTIL_ASSERT(nextp == elm1->field.le_prev); \ nextp = &LIST_NEXT(elm1, field); \ elm1 = *nextp; \ } \ } while (0) /* Helper: Verify that all the elements in a TAILQ are internally consistent. * Checks for circular lists and bad prev/next pointers. * * Example usage: * EVUTIL_ASSERT_TAILQ_OK(activelist, event, ev_active_next); */ #define EVUTIL_ASSERT_TAILQ_OK(tailq, type, field) do { \ struct type *elm1, *elm2, **nextp; \ if (TAILQ_EMPTY((tailq))) \ break; \ \ /* Check list for circularity using Floyd's */ \ /* 'Tortoise and Hare' algorithm */ \ elm1 = TAILQ_FIRST((tailq)); \ elm2 = TAILQ_NEXT(elm1, field); \ while (elm1 && elm2) { \ EVUTIL_ASSERT(elm1 != elm2); \ elm1 = TAILQ_NEXT(elm1, field); \ elm2 = TAILQ_NEXT(elm2, field); \ if (!elm2) \ break; \ EVUTIL_ASSERT(elm1 != elm2); \ elm2 = TAILQ_NEXT(elm2, field); \ } \ \ /* Now check next and prev pointers for consistency. */ \ nextp = &TAILQ_FIRST((tailq)); \ elm1 = TAILQ_FIRST((tailq)); \ while (elm1) { \ EVUTIL_ASSERT(*nextp == elm1); \ EVUTIL_ASSERT(nextp == elm1->field.tqe_prev); \ nextp = &TAILQ_NEXT(elm1, field); \ elm1 = *nextp; \ } \ EVUTIL_ASSERT(nextp == (tailq)->tqh_last); \ } while (0) /* Locale-independent replacements for some ctypes functions. Use these * when you care about ASCII's notion of character types, because you are about * to send those types onto the wire. */ EVENT2_EXPORT_SYMBOL int EVUTIL_ISALPHA_(char c); EVENT2_EXPORT_SYMBOL int EVUTIL_ISALNUM_(char c); int EVUTIL_ISSPACE_(char c); EVENT2_EXPORT_SYMBOL int EVUTIL_ISDIGIT_(char c); EVENT2_EXPORT_SYMBOL int EVUTIL_ISXDIGIT_(char c); int EVUTIL_ISPRINT_(char c); int EVUTIL_ISLOWER_(char c); int EVUTIL_ISUPPER_(char c); EVENT2_EXPORT_SYMBOL char EVUTIL_TOUPPER_(char c); EVENT2_EXPORT_SYMBOL char EVUTIL_TOLOWER_(char c); /** Remove all trailing horizontal whitespace (space or tab) from the end of a * string */ EVENT2_EXPORT_SYMBOL void evutil_rtrim_lws_(char *); /** Helper macro. If we know that a given pointer points to a field in a structure, return a pointer to the structure itself. Used to implement our half-baked C OO. Example: struct subtype { int x; struct supertype common; int y; }; ... void fn(struct supertype *super) { struct subtype *sub = EVUTIL_UPCAST(super, struct subtype, common); ... } */ #define EVUTIL_UPCAST(ptr, type, field) \ ((type *)(((char*)(ptr)) - evutil_offsetof(type, field))) /* As open(pathname, flags, mode), except that the file is always opened with * the close-on-exec flag set. (And the mode argument is mandatory.) */ int evutil_open_closeonexec_(const char *pathname, int flags, unsigned mode); EVENT2_EXPORT_SYMBOL int evutil_read_file_(const char *filename, char **content_out, size_t *len_out, int is_binary); EVENT2_EXPORT_SYMBOL int evutil_socket_connect_(evutil_socket_t *fd_ptr, const struct sockaddr *sa, int socklen); EVENT2_EXPORT_SYMBOL int evutil_socket_finished_connecting_(evutil_socket_t fd); #ifdef EVENT__HAVE_AFUNIX_H EVENT2_EXPORT_SYMBOL int evutil_check_working_afunix_(); #endif EVENT2_EXPORT_SYMBOL int evutil_ersatz_socketpair_(int, int , int, evutil_socket_t[2]); int evutil_resolve_(int family, const char *hostname, struct sockaddr *sa, ev_socklen_t *socklen, int port); const char *evutil_getenv_(const char *name); /* Structure to hold the state of our weak random number generator. */ struct evutil_weakrand_state { ev_uint32_t seed; }; #define EVUTIL_WEAKRAND_MAX EV_INT32_MAX /* Initialize the state of a week random number generator based on 'seed'. If * the seed is 0, construct a new seed based on not-very-strong platform * entropy, like the PID and the time of day. * * This function, and the other evutil_weakrand* functions, are meant for * speed, not security or statistical strength. If you need a RNG which an * attacker can't predict, or which passes strong statistical tests, use the * evutil_secure_rng* functions instead. */ EVENT2_EXPORT_SYMBOL ev_uint32_t evutil_weakrand_seed_(struct evutil_weakrand_state *state, ev_uint32_t seed); /* Return a pseudorandom value between 0 and EVUTIL_WEAKRAND_MAX inclusive. * Updates the state in 'seed' as needed -- this value must be protected by a * lock. */ EVENT2_EXPORT_SYMBOL ev_int32_t evutil_weakrand_(struct evutil_weakrand_state *seed); /* Return a pseudorandom value x such that 0 <= x < top. top must be no more * than EVUTIL_WEAKRAND_MAX. Updates the state in 'seed' as needed -- this * value must be proteced by a lock */ EVENT2_EXPORT_SYMBOL ev_int32_t evutil_weakrand_range_(struct evutil_weakrand_state *seed, ev_int32_t top); /* Evaluates to the same boolean value as 'p', and hints to the compiler that * we expect this value to be false. */ #if defined(__GNUC__) && __GNUC__ >= 3 /* gcc 3.0 or later */ #define EVUTIL_UNLIKELY(p) __builtin_expect(!!(p),0) #else #define EVUTIL_UNLIKELY(p) (p) #endif #if EVUTIL_HAS_ATTRIBUTE(fallthrough) #define EVUTIL_FALLTHROUGH __attribute__((fallthrough)) #else #define EVUTIL_FALLTHROUGH /* fallthrough */ #endif /* Replacement for assert() that calls event_errx on failure. */ #ifdef NDEBUG #define EVUTIL_ASSERT(cond) EVUTIL_NIL_CONDITION_(cond) #define EVUTIL_FAILURE_CHECK(cond) 0 #else #define EVUTIL_ASSERT(cond) \ do { \ if (EVUTIL_UNLIKELY(!(cond))) { \ event_errx(EVENT_ERR_ABORT_, \ "%s:%d: Assertion %s failed in %s", \ __FILE__,__LINE__,#cond,__func__); \ /* In case a user-supplied handler tries to */ \ /* return control to us, log and abort here. */ \ (void)fprintf(stderr, \ "%s:%d: Assertion %s failed in %s", \ __FILE__,__LINE__,#cond,__func__); \ abort(); \ } \ } while (0) #define EVUTIL_FAILURE_CHECK(cond) EVUTIL_UNLIKELY(cond) #endif #ifndef EVENT__HAVE_STRUCT_SOCKADDR_STORAGE /* Replacement for sockaddr storage that we can use internally on platforms * that lack it. It is not space-efficient, but neither is sockaddr_storage. */ struct sockaddr_storage { union { struct sockaddr ss_sa; struct sockaddr_in ss_sin; struct sockaddr_in6 ss_sin6; char ss_padding[128]; } ss_union; }; #define ss_family ss_union.ss_sa.sa_family #endif /* Internal addrinfo error code. This one is returned from only from * evutil_getaddrinfo_common_, when we are sure that we'll have to hit a DNS * server. */ #define EVUTIL_EAI_NEED_RESOLVE -90002 struct evdns_base; struct evdns_getaddrinfo_request; typedef struct evdns_getaddrinfo_request* (*evdns_getaddrinfo_fn)( struct evdns_base *base, const char *nodename, const char *servname, const struct evutil_addrinfo *hints_in, void (*cb)(int, struct evutil_addrinfo *, void *), void *arg); EVENT2_EXPORT_SYMBOL void evutil_set_evdns_getaddrinfo_fn_(evdns_getaddrinfo_fn fn); typedef void (*evdns_getaddrinfo_cancel_fn)( struct evdns_getaddrinfo_request *req); EVENT2_EXPORT_SYMBOL void evutil_set_evdns_getaddrinfo_cancel_fn_(evdns_getaddrinfo_cancel_fn fn); EVENT2_EXPORT_SYMBOL struct evutil_addrinfo *evutil_new_addrinfo_(struct sockaddr *sa, ev_socklen_t socklen, const struct evutil_addrinfo *hints); EVENT2_EXPORT_SYMBOL struct evutil_addrinfo *evutil_addrinfo_append_(struct evutil_addrinfo *first, struct evutil_addrinfo *append); EVENT2_EXPORT_SYMBOL void evutil_adjust_hints_for_addrconfig_(struct evutil_addrinfo *hints); EVENT2_EXPORT_SYMBOL int evutil_getaddrinfo_common_(const char *nodename, const char *servname, struct evutil_addrinfo *hints, struct evutil_addrinfo **res, int *portnum); struct evdns_getaddrinfo_request *evutil_getaddrinfo_async_( struct evdns_base *dns_base, const char *nodename, const char *servname, const struct evutil_addrinfo *hints_in, void (*cb)(int, struct evutil_addrinfo *, void *), void *arg); void evutil_getaddrinfo_cancel_async_(struct evdns_getaddrinfo_request *data); /** Return true iff sa is a looback address. (That is, it is 127.0.0.1/8, or * ::1). */ EVENT2_EXPORT_SYMBOL int evutil_sockaddr_is_loopback_(const struct sockaddr *sa); /** Formats a sockaddr sa into a string buffer of size outlen stored in out. Returns a pointer to out. Always writes something into out, so it's safe to use the output of this function without checking it for NULL. */ EVENT2_EXPORT_SYMBOL const char *evutil_format_sockaddr_port_(const struct sockaddr *sa, char *out, size_t outlen); int evutil_hex_char_to_int_(char c); void evutil_free_secure_rng_globals_(void); void evutil_free_globals_(void); #ifdef _WIN32 EVENT2_EXPORT_SYMBOL HMODULE evutil_load_windows_system_library_(const TCHAR *library_name); #endif #if defined(_MSC_VER) || defined(__MINGW32__) || defined(__MINGW64__) #define EV_WINDOWS 1 #else #define EV_WINDOWS 0 #endif #ifndef EV_SIZE_FMT #if EV_WINDOWS #define EV_U64_FMT "%I64u" #define EV_I64_FMT "%I64d" #define EV_I64_ARG(x) ((__int64)(x)) #define EV_U64_ARG(x) ((unsigned __int64)(x)) #else #define EV_U64_FMT "%llu" #define EV_I64_FMT "%lld" #define EV_I64_ARG(x) ((long long)(x)) #define EV_U64_ARG(x) ((unsigned long long)(x)) #endif #endif #ifdef _WIN32 #define EV_SOCK_FMT EV_I64_FMT #define EV_SOCK_ARG(x) EV_I64_ARG((x)) #else #define EV_SOCK_FMT "%d" #define EV_SOCK_ARG(x) (x) #endif #if defined(__STDC__) && defined(__STDC_VERSION__) && !defined(__MINGW64_VERSION_MAJOR) #if (__STDC_VERSION__ >= 199901L) #define EV_SIZE_FMT "%zu" #define EV_SSIZE_FMT "%zd" #define EV_SIZE_ARG(x) (x) #define EV_SSIZE_ARG(x) (x) #endif #endif #ifndef EV_SIZE_FMT #if (EVENT__SIZEOF_SIZE_T <= EVENT__SIZEOF_LONG) #define EV_SIZE_FMT "%lu" #define EV_SSIZE_FMT "%ld" #define EV_SIZE_ARG(x) ((unsigned long)(x)) #define EV_SSIZE_ARG(x) ((long)(x)) #else #define EV_SIZE_FMT EV_U64_FMT #define EV_SSIZE_FMT EV_I64_FMT #define EV_SIZE_ARG(x) EV_U64_ARG(x) #define EV_SSIZE_ARG(x) EV_I64_ARG(x) #endif #endif EVENT2_EXPORT_SYMBOL evutil_socket_t evutil_socket_(int domain, int type, int protocol); evutil_socket_t evutil_accept4_(evutil_socket_t sockfd, struct sockaddr *addr, ev_socklen_t *addrlen, int flags); /* used by one of the test programs.. */ EVENT2_EXPORT_SYMBOL int evutil_make_internal_pipe_(evutil_socket_t fd[2]); evutil_socket_t evutil_eventfd_(unsigned initval, int flags); #ifdef SOCK_NONBLOCK #define EVUTIL_SOCK_NONBLOCK SOCK_NONBLOCK #else #define EVUTIL_SOCK_NONBLOCK 0x4000000 #endif #ifdef SOCK_CLOEXEC #define EVUTIL_SOCK_CLOEXEC SOCK_CLOEXEC #else #define EVUTIL_SOCK_CLOEXEC 0x80000000 #endif #ifdef EFD_NONBLOCK #define EVUTIL_EFD_NONBLOCK EFD_NONBLOCK #else #define EVUTIL_EFD_NONBLOCK 0x4000 #endif #ifdef EFD_CLOEXEC #define EVUTIL_EFD_CLOEXEC EFD_CLOEXEC #else #define EVUTIL_EFD_CLOEXEC 0x8000 #endif void evutil_memclear_(void *mem, size_t len); struct in_addr; struct in6_addr; /* This is a any, loopback, link-local, multicast */ EVENT2_EXPORT_SYMBOL int evutil_v4addr_is_local_(const struct in_addr *in); /* This is a reserved, ipv4compat, ipv4map, loopback, * link-local, multicast, or unspecified address. */ EVENT2_EXPORT_SYMBOL int evutil_v6addr_is_local_(const struct in6_addr *in); #ifdef __cplusplus } #endif #endif