--- /dev/null
+/*
+ * Copyright (c) 2007-2010 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 _EVENT2_UTIL_H_
+#define _EVENT2_UTIL_H_
+
+/** @file event2/util.h
+
+ Common convenience functions for cross-platform portability and
+ related socket manipulations.
+
+ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <event2/event-config.h>
+#ifdef _EVENT_HAVE_SYS_TIME_H
+#include <sys/time.h>
+#endif
+#ifdef _EVENT_HAVE_STDINT_H
+#include <stdint.h>
+#elif defined(_EVENT_HAVE_INTTYPES_H)
+#include <inttypes.h>
+#endif
+#ifdef _EVENT_HAVE_SYS_TYPES_H
+#include <sys/types.h>
+#endif
+#ifdef _EVENT_HAVE_STDDEF_H
+#include <stddef.h>
+#endif
+#ifdef _MSC_VER
+#include <BaseTsd.h>
+#endif
+#include <stdarg.h>
+#ifdef _EVENT_HAVE_NETDB_H
+#if !defined(_GNU_SOURCE)
+#define _GNU_SOURCE
+#endif
+#include <netdb.h>
+#endif
+
+#ifdef WIN32
+#include <winsock2.h>
+#else
+#include <sys/socket.h>
+#endif
+
+/* Integer type definitions for types that are supposed to be defined in the
+ * C99-specified stdint.h. Shamefully, some platforms do not include
+ * stdint.h, so we need to replace it. (If you are on a platform like this,
+ * your C headers are now over 10 years out of date. You should bug them to
+ * do something about this.)
+ *
+ * We define:
+ * ev_uint64_t, ev_uint32_t, ev_uint16_t, ev_uint8_t -- unsigned integer
+ * types of exactly 64, 32, 16, and 8 bits respectively.
+ * ev_int64_t, ev_int32_t, ev_int16_t, ev_int8_t -- signed integer
+ * types of exactly 64, 32, 16, and 8 bits respectively.
+ * ev_uintptr_t, ev_intptr_t -- unsigned/signed integers large enough
+ * to hold a pointer without loss of bits.
+ */
+#ifdef _EVENT_HAVE_UINT64_T
+#define ev_uint64_t uint64_t
+#define ev_int64_t int64_t
+#elif defined(WIN32)
+#define ev_uint64_t unsigned __int64
+#define ev_int64_t signed __int64
+#elif _EVENT_SIZEOF_LONG_LONG == 8
+#define ev_uint64_t unsigned long long
+#define ev_int64_t long long
+#elif _EVENT_SIZEOF_LONG == 8
+#define ev_uint64_t unsigned long
+#define ev_int64_t long
+#else
+#error "No way to define ev_uint64_t"
+#endif
+
+#ifdef _EVENT_HAVE_UINT32_T
+#define ev_uint32_t uint32_t
+#define ev_int32_t int32_t
+#elif defined(WIN32)
+#define ev_uint32_t unsigned int
+#define ev_int32_t signed int
+#elif _EVENT_SIZEOF_LONG == 4
+#define ev_uint32_t unsigned long
+#define ev_int32_t signed long
+#elif _EVENT_SIZEOF_INT == 4
+#define ev_uint32_t unsigned int
+#define ev_int32_t signed int
+#else
+#error "No way to define ev_uint32_t"
+#endif
+
+#ifdef _EVENT_HAVE_UINT16_T
+#define ev_uint16_t uint16_t
+#define ev_int16_t int16_t
+#elif defined(WIN32)
+#define ev_uint16_t unsigned short
+#define ev_int16_t signed short
+#elif _EVENT_SIZEOF_INT == 2
+#define ev_uint16_t unsigned int
+#define ev_int16_t signed int
+#elif _EVENT_SIZEOF_SHORT == 2
+#define ev_uint16_t unsigned short
+#define ev_int16_t signed short
+#else
+#error "No way to define ev_uint16_t"
+#endif
+
+#ifdef _EVENT_HAVE_UINT8_T
+#define ev_uint8_t uint8_t
+#define ev_int8_t int8_t
+#else
+#define ev_uint8_t unsigned char
+#define ev_int8_t signed char
+#endif
+
+/* Some openbsd autoconf versions get the name of this macro wrong. */
+#if defined(_EVENT_SIZEOF_VOID__) && !defined(_EVENT_SIZEOF_VOID_P)
+#define _EVENT_SIZEOF_VOID_P _EVENT_SIZEOF_VOID__
+#endif
+
+#ifdef _EVENT_HAVE_UINTPTR_T
+#define ev_uintptr_t uintptr_t
+#define ev_intptr_t intptr_t
+#elif _EVENT_SIZEOF_VOID_P <= 4
+#define ev_uintptr_t ev_uint32_t
+#define ev_intptr_t ev_int32_t
+#elif _EVENT_SIZEOF_VOID_P <= 8
+#define ev_uintptr_t ev_uint64_t
+#define ev_intptr_t ev_int64_t
+#else
+#error "No way to define ev_uintptr_t"
+#endif
+
+#ifdef _EVENT_ssize_t
+#define ev_ssize_t _EVENT_ssize_t
+#else
+#define ev_ssize_t ssize_t
+#endif
+
+#ifdef WIN32
+#define ev_off_t ev_int64_t
+#else
+#define ev_off_t off_t
+#endif
+
+/* Limits for integer types.
+
+ We're making two assumptions here:
+ - The compiler does constant folding properly.
+ - The platform does signed arithmetic in two's complement.
+*/
+
+#define EV_UINT64_MAX ((((ev_uint64_t)0xffffffffUL) << 32) | 0xffffffffUL)
+#define EV_INT64_MAX ((((ev_int64_t) 0x7fffffffL) << 32) | 0xffffffffL)
+#define EV_INT64_MIN ((-EV_INT64_MAX) - 1)
+#define EV_UINT32_MAX ((ev_uint32_t)0xffffffffUL)
+#define EV_INT32_MAX ((ev_int32_t) 0x7fffffffL)
+#define EV_INT32_MIN ((-EV_INT32_MAX) - 1)
+#define EV_UINT16_MAX ((ev_uint16_t)0xffffUL)
+#define EV_INT16_MAX ((ev_int16_t) 0x7fffL)
+#define EV_INT16_MIN ((-EV_INT16_MAX) - 1)
+#define EV_UINT8_MAX 255
+#define EV_INT8_MAX 127
+#define EV_INT8_MIN ((-EV_INT8_MAX) - 1)
+
+#if _EVENT_SIZEOF_SIZE_T == 8
+#define EV_SIZE_MAX EV_UINT64_MAX
+#define EV_SSIZE_MAX EV_INT64_MAX
+#elif _EVENT_SIZEOF_SIZE_T == 4
+#define EV_SIZE_MAX EV_UINT32_MAX
+#define EV_SSIZE_MAX EV_INT32_MAX
+#else
+#error "No way to define SIZE_MAX"
+#endif
+
+#define EV_SSIZE_MIN ((-EV_SSIZE_MAX) - 1)
+
+#ifdef WIN32
+#define ev_socklen_t int
+#elif defined(_EVENT_socklen_t)
+#define ev_socklen_t _EVENT_socklen_t
+#else
+#define ev_socklen_t socklen_t
+#endif
+
+#ifdef _EVENT_HAVE_STRUCT_SOCKADDR_STORAGE___SS_FAMILY
+#if !defined(_EVENT_HAVE_STRUCT_SOCKADDR_STORAGE_SS_FAMILY) \
+ && !defined(ss_family)
+#define ss_family __ss_family
+#endif
+#endif
+
+#ifdef WIN32
+/** A type wide enough to hold the output of "socket()" or "accept()". On
+ * Windows, this is an intptr_t; elsewhere, it is an int. */
+#define evutil_socket_t intptr_t
+#else
+#define evutil_socket_t int
+#endif
+
+/** Create two new sockets that are connected to each other. On Unix, this
+ simply calls socketpair(). On Windows, it uses the loopback network
+ interface on 127.0.0.1, and only AF_INET,SOCK_STREAM are supported.
+
+ (This may fail on some Windows hosts where firewall software has cleverly
+ decided to keep 127.0.0.1 from talking to itself.)
+
+ Parameters and return values are as for socketpair()
+*/
+int evutil_socketpair(int d, int type, int protocol, evutil_socket_t sv[2]);
+/** Do platform-specific operations as needed to make a socket nonblocking.
+
+ @param sock The socket to make nonblocking
+ @return 0 on success, -1 on failure
+ */
+int evutil_make_socket_nonblocking(evutil_socket_t sock);
+
+/** Do platform-specific operations on a listener socket to make sure that
+ another program will be able to bind this address right after we've
+ closed the listener
+
+ @param sock The socket to make reusable
+ @return 0 on success, -1 on failure
+ */
+int evutil_make_listen_socket_reuseable(evutil_socket_t sock);
+
+/** Do platform-specific operations as needed to close a socket upon a
+ successful execution of one of the exec*() functions.
+
+ @param sock The socket to be closed
+ @return 0 on success, -1 on failure
+ */
+int evutil_make_socket_closeonexec(evutil_socket_t sock);
+
+/** Do the platform-specific call needed to close a socket returned from
+ socket() or accept().
+
+ @param sock The socket to be closed
+ @return 0 on success, -1 on failure
+ */
+int evutil_closesocket(evutil_socket_t sock);
+#define EVUTIL_CLOSESOCKET(s) evutil_closesocket(s)
+
+/* Winsock handles socket errors differently from the rest of the world.
+ * Elsewhere, a socket error is like any other error and is stored in errno.
+ * But winsock functions require you to retrieve the error with a special
+ * function, and don't let you use strerror for the error codes. And handling
+ * EWOULDBLOCK is ... different. */
+
+#ifdef WIN32
+/** Return the most recent socket error. Not idempotent on all platforms. */
+#define EVUTIL_SOCKET_ERROR() WSAGetLastError()
+/** Replace the most recent socket error with errcode */
+#define EVUTIL_SET_SOCKET_ERROR(errcode) \
+ do { WSASetLastError(errcode); } while (0)
+/** Return the most recent socket error to occur on sock. */
+int evutil_socket_geterror(evutil_socket_t sock);
+/** Convert a socket error to a string. */
+const char *evutil_socket_error_to_string(int errcode);
+#else
+#define EVUTIL_SOCKET_ERROR() (errno)
+#define EVUTIL_SET_SOCKET_ERROR(errcode) \
+ do { errno = (errcode); } while (0)
+#define evutil_socket_geterror(sock) (errno)
+#define evutil_socket_error_to_string(errcode) (strerror(errcode))
+#endif
+
+/*
+ * Manipulation macros for struct timeval. We define replacements
+ * for timeradd, timersub, timerclear, timercmp, and timerisset.
+ */
+#ifdef _EVENT_HAVE_TIMERADD
+#define evutil_timeradd(tvp, uvp, vvp) timeradd((tvp), (uvp), (vvp))
+#define evutil_timersub(tvp, uvp, vvp) timersub((tvp), (uvp), (vvp))
+#else
+#define evutil_timeradd(tvp, uvp, vvp) \
+ do { \
+ (vvp)->tv_sec = (tvp)->tv_sec + (uvp)->tv_sec; \
+ (vvp)->tv_usec = (tvp)->tv_usec + (uvp)->tv_usec; \
+ if ((vvp)->tv_usec >= 1000000) { \
+ (vvp)->tv_sec++; \
+ (vvp)->tv_usec -= 1000000; \
+ } \
+ } while (0)
+#define evutil_timersub(tvp, uvp, vvp) \
+ do { \
+ (vvp)->tv_sec = (tvp)->tv_sec - (uvp)->tv_sec; \
+ (vvp)->tv_usec = (tvp)->tv_usec - (uvp)->tv_usec; \
+ if ((vvp)->tv_usec < 0) { \
+ (vvp)->tv_sec--; \
+ (vvp)->tv_usec += 1000000; \
+ } \
+ } while (0)
+#endif /* !_EVENT_HAVE_HAVE_TIMERADD */
+
+#ifdef _EVENT_HAVE_TIMERCLEAR
+#define evutil_timerclear(tvp) timerclear(tvp)
+#else
+#define evutil_timerclear(tvp) (tvp)->tv_sec = (tvp)->tv_usec = 0
+#endif
+
+/** Return true iff the tvp is related to uvp according to the relational
+ * operator cmp. Recognized values for cmp are ==, <=, <, >=, and >. */
+#define evutil_timercmp(tvp, uvp, cmp) \
+ (((tvp)->tv_sec == (uvp)->tv_sec) ? \
+ ((tvp)->tv_usec cmp (uvp)->tv_usec) : \
+ ((tvp)->tv_sec cmp (uvp)->tv_sec))
+
+#ifdef _EVENT_HAVE_TIMERISSET
+#define evutil_timerisset(tvp) timerisset(tvp)
+#else
+#define evutil_timerisset(tvp) ((tvp)->tv_sec || (tvp)->tv_usec)
+#endif
+
+/* Replacement for offsetof on platforms that don't define it. */
+#ifdef offsetof
+#define evutil_offsetof(type, field) offsetof(type, field)
+#else
+#define evutil_offsetof(type, field) ((off_t)(&((type *)0)->field))
+#endif
+
+/* big-int related functions */
+/** Parse a 64-bit value from a string. Arguments are as for strtol. */
+ev_int64_t evutil_strtoll(const char *s, char **endptr, int base);
+
+/* Replacement for gettimeofday on platforms that lack it. */
+#ifdef _EVENT_HAVE_GETTIMEOFDAY
+#define evutil_gettimeofday(tv, tz) gettimeofday((tv), (tz))
+#else
+struct timezone;
+int evutil_gettimeofday(struct timeval *tv, struct timezone *tz);
+#endif
+
+/** Replacement for snprintf to get consistent behavior on platforms for
+ which the return value of snprintf does not conform to C99.
+ */
+int evutil_snprintf(char *buf, size_t buflen, const char *format, ...)
+#ifdef __GNUC__
+ __attribute__((format(printf, 3, 4)))
+#endif
+;
+int evutil_vsnprintf(char *buf, size_t buflen, const char *format, va_list ap);
+
+/** Replacement for inet_ntop for platforms which lack it. */
+const char *evutil_inet_ntop(int af, const void *src, char *dst, size_t len);
+/** Replacement for inet_pton for platforms which lack it. */
+int evutil_inet_pton(int af, const char *src, void *dst);
+struct sockaddr;
+
+/** Parse an IPv4 or IPv6 address, with optional port, from a string.
+
+ Recognized formats are:
+ - [IPv6Address]:port
+ - [IPv6Address]
+ - IPv6Address
+ - IPv4Address:port
+ - IPv4Address
+
+ If no port is specified, the port in the output is set to 0.
+
+ @param str The string to parse.
+ @param out A struct sockaddr to hold the result. This should probably be
+ a struct sockaddr_storage.
+ @param outlen A pointer to the number of bytes that that 'out' can safely
+ hold. Set to the number of bytes used in 'out' on success.
+ @return -1 if the address is not well-formed, if the port is out of range,
+ or if out is not large enough to hold the result. Otherwise returns
+ 0 on success.
+*/
+int evutil_parse_sockaddr_port(const char *str, struct sockaddr *out, int *outlen);
+
+/** Compare two sockaddrs; return 0 if they are equal, or less than 0 if sa1
+ * preceeds sa2, or greater than 0 if sa1 follows sa2. If include_port is
+ * true, consider the port as well as the address. Only implemented for
+ * AF_INET and AF_INET6 addresses. The ordering is not guaranteed to remain
+ * the same between Libevent versions. */
+int evutil_sockaddr_cmp(const struct sockaddr *sa1, const struct sockaddr *sa2,
+ int include_port);
+
+/** As strcasecmp, but always compares the characters in locale-independent
+ ASCII. That's useful if you're handling data in ASCII-based protocols.
+ */
+int evutil_ascii_strcasecmp(const char *str1, const char *str2);
+/** As strncasecmp, but always compares the characters in locale-independent
+ ASCII. That's useful if you're handling data in ASCII-based protocols.
+ */
+int evutil_ascii_strncasecmp(const char *str1, const char *str2, size_t n);
+
+/* Here we define evutil_addrinfo to the native addrinfo type, or redefinte it
+ * if this system has no getaddrinfo(). */
+#ifdef _EVENT_HAVE_STRUCT_ADDRINFO
+#define evutil_addrinfo addrinfo
+#else
+struct evutil_addrinfo {
+ int ai_flags; /* AI_PASSIVE, AI_CANONNAME, AI_NUMERICHOST */
+ int ai_family; /* PF_xxx */
+ int ai_socktype; /* SOCK_xxx */
+ int ai_protocol; /* 0 or IPPROTO_xxx for IPv4 and IPv6 */
+ size_t ai_addrlen; /* length of ai_addr */
+ char *ai_canonname; /* canonical name for nodename */
+ struct sockaddr *ai_addr; /* binary address */
+ struct evutil_addrinfo *ai_next; /* next structure in linked list */
+};
+#endif
+#ifdef EAI_ADDRFAMILY
+#define EVUTIL_EAI_ADDRFAMILY EAI_ADDRFAMILY
+#else
+#define EVUTIL_EAI_ADDRFAMILY -901
+#endif
+#ifdef EAI_AGAIN
+#define EVUTIL_EAI_AGAIN EAI_AGAIN
+#else
+#define EVUTIL_EAI_AGAIN -902
+#endif
+#ifdef EAI_BADFLAGS
+#define EVUTIL_EAI_BADFLAGS EAI_BADFLAGS
+#else
+#define EVUTIL_EAI_BADFLAGS -903
+#endif
+#ifdef EAI_FAIL
+#define EVUTIL_EAI_FAIL EAI_FAIL
+#else
+#define EVUTIL_EAI_FAIL -904
+#endif
+#ifdef EAI_FAMILY
+#define EVUTIL_EAI_FAMILY EAI_FAMILY
+#else
+#define EVUTIL_EAI_FAMILY -905
+#endif
+#ifdef EAI_MEMORY
+#define EVUTIL_EAI_MEMORY EAI_MEMORY
+#else
+#define EVUTIL_EAI_MEMORY -906
+#endif
+/* This test is a bit complicated, since some MS SDKs decide to
+ * remove NODATA or redefine it to be the same as NONAME, in a
+ * fun interpretation of RFC 2553 and RFC 3493. */
+#if defined(EAI_NODATA) && (!defined(EAI_NONAME) || EAI_NODATA != EAI_NONAME)
+#define EVUTIL_EAI_NODATA EAI_NODATA
+#else
+#define EVUTIL_EAI_NODATA -907
+#endif
+#ifdef EAI_NONAME
+#define EVUTIL_EAI_NONAME EAI_NONAME
+#else
+#define EVUTIL_EAI_NONAME -908
+#endif
+#ifdef EAI_SERVICE
+#define EVUTIL_EAI_SERVICE EAI_SERVICE
+#else
+#define EVUTIL_EAI_SERVICE -909
+#endif
+#ifdef EAI_SOCKTYPE
+#define EVUTIL_EAI_SOCKTYPE EAI_SOCKTYPE
+#else
+#define EVUTIL_EAI_SOCKTYPE -910
+#endif
+#ifdef EAI_SYSTEM
+#define EVUTIL_EAI_SYSTEM EAI_SYSTEM
+#else
+#define EVUTIL_EAI_SYSTEM -911
+#endif
+
+#define EVUTIL_EAI_CANCEL -90001
+
+#ifdef AI_PASSIVE
+#define EVUTIL_AI_PASSIVE AI_PASSIVE
+#else
+#define EVUTIL_AI_PASSIVE 0x1000
+#endif
+#ifdef AI_CANONNAME
+#define EVUTIL_AI_CANONNAME AI_CANONNAME
+#else
+#define EVUTIL_AI_CANONNAME 0x2000
+#endif
+#ifdef AI_NUMERICHOST
+#define EVUTIL_AI_NUMERICHOST AI_NUMERICHOST
+#else
+#define EVUTIL_AI_NUMERICHOST 0x4000
+#endif
+#ifdef AI_NUMERICSERV
+#define EVUTIL_AI_NUMERICSERV AI_NUMERICSERV
+#else
+#define EVUTIL_AI_NUMERICSERV 0x8000
+#endif
+#ifdef AI_V4MAPPED
+#define EVUTIL_AI_V4MAPPED AI_V4MAPPED
+#else
+#define EVUTIL_AI_V4MAPPED 0x10000
+#endif
+#ifdef AI_ALL
+#define EVUTIL_AI_ALL AI_ALL
+#else
+#define EVUTIL_AI_ALL 0x20000
+#endif
+#ifdef AI_ADDRCONFIG
+#define EVUTIL_AI_ADDRCONFIG AI_ADDRCONFIG
+#else
+#define EVUTIL_AI_ADDRCONFIG 0x40000
+#endif
+
+struct evutil_addrinfo;
+/* This function clones getaddrinfo for systems that don't have it. For full
+ * details, see RFC 3493, section 6.1.
+ *
+ * Limitations:
+ * - When the system has no getaddrinfo, we fall back to gethostbyname_r or
+ * gethostbyname, with their attendant issues.
+ * - The AI_V4MAPPED and AI_ALL flags are not currently implemented.
+ *
+ * For a nonblocking variant, see evdns_getaddrinfo.
+ */
+int evutil_getaddrinfo(const char *nodename, const char *servname,
+ const struct evutil_addrinfo *hints_in, struct evutil_addrinfo **res);
+
+/* Release storage allocated by evutil_getaddrinfo or evdns_getaddrinfo. */
+void evutil_freeaddrinfo(struct evutil_addrinfo *ai);
+
+const char *evutil_gai_strerror(int err);
+
+/* Generate n bytes of secure pseudorandom data, and store them in buf.
+ *
+ * By default, Libevent uses an ARC4-based random number generator, seeded
+ * using the platform's entropy source (/dev/urandom on Unix-like systems;
+ * CryptGenRandom on Windows).
+ */
+void evutil_secure_rng_get_bytes(void *buf, size_t n);
+
+/**
+ * Seed the secure random number generator if needed, and return 0 on
+ * success or -1 on failure.
+ *
+ * It is okay to call this function more than once; it will still return
+ * 0 if the RNG has been successfully seeded and -1 if it can't be
+ * seeded.
+ *
+ * Ordinarily you don't need to call this function from your own code;
+ * Libevent will seed the RNG itself the first time it needs good random
+ * numbers. You only need to call it if (a) you want to double-check
+ * that one of the seeding methods did succeed, or (b) you plan to drop
+ * the capability to seed (by chrooting, or dropping capabilities, or
+ * whatever), and you want to make sure that seeding happens before your
+ * program loses the ability to do it.
+ */
+int evutil_secure_rng_init(void);
+
+/** Seed the random number generator with extra random bytes.
+
+ You should almost never need to call this function; it should be
+ sufficient to invoke evutil_secure_rng_init(), or let Libevent take
+ care of calling evutil_secure_rng_init() on its own.
+
+ If you call this function as a _replacement_ for the regular
+ entropy sources, then you need to be sure that your input
+ contains a fairly large amount of strong entropy. Doing so is
+ notoriously hard: most people who try get it wrong. Watch out!
+
+ @param dat a buffer full of a strong source of random numbers
+ @param datlen the number of bytes to read from datlen
+ */
+void evutil_secure_rng_add_bytes(const char *dat, size_t datlen);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _EVUTIL_H_ */
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