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//
// Copyright 2021 Staysail Systems, Inc. <info@staysail.tech>
//
// This software is supplied under the terms of the MIT License, a
// copy of which should be located in the distribution where this
// file was obtained (LICENSE.txt). A copy of the license may also be
// found online at https://opensource.org/licenses/MIT.
//
// The following adjustments to the platform may be defined. These can
// be defined in either platform/config.h or loaded in via external
// defines using cmake.
//
// #define NNG_USE_GETTIMEOFDAY
// This macro is defined if you lack a working clock_gettime,
// nanosleep, or pthread_condattr_setclock. In this case the
// library uses the system clock for relative sleeps, timers, etc.
// This can be dangerous if the system clock is changed, so only
// use this if you have no other choice. If it appears that
// the system lacks clock_gettime, then it will choose this automatically.
// This value may be ignored on platforms that don't use POSIX clocks.
//
// #define NNG_USE_CLOCKID CLOCK_MONOTONIC
// This macro may be defined to a different clock id (see
// clock_gettime()). By default, we use CLOCK_MONOTONIC if it exists,
// or CLOCK_REALTIME otherwise. (Except for macOS, which does not have
// a functional pthread_condattr_setclock().)
//
// This is ignored if NNG_USE_GETTIMEOFDAY is defined.
// Platforms that don't use POSIX clocks will probably
// ignore any setting here.
//
// #define NNG_HAVE_BACKTRACE
// If your system has a working backtrace(), and backtrace_symbols(),
// along with <execinfo.h>, you can define this to get richer backtrace
// information for debugging.
//
// #define NNG_USE_GETRANDOM
// #define NNG_USE_GETENTROPY
// #define NNG_USE_ARC4RANDOM
// #define NNG_USE_DEVURANDOM
// These are options for obtaining entropy to seed the pRNG.
// All known modern UNIX variants can support NNG_USE_DEVURANDOM,
// but the other options are better still, but not portable.
#include <time.h>
#ifdef NNG_PLATFORM_POSIX
#if !defined(NNG_USE_DEVURANDOM) && !defined(NNG_USE_GETENTROPY) && \
!defined(NNG_USE_GETRANDOM) && !defined(NNG_USE_ARC4RANDOM)
#if defined(NNG_HAVE_GETENTROPY)
#define NNG_USE_GETENTROPY 1
#elif defined(NNG_HAVE_GETRANDOM)
#define NNG_USE_GETRANDOM 1
#elif defined(NNG_HAVE_ARC4RANDOM)
#define NNG_USE_ARC4RANDOM
#else
// It should never hurt to use DEVURANDOM, since if the device does not
// exist then we won't open it. (Provided: it would be bad if the device
// exists but has somehow very very different semantics. We don't know
// of any such concerns.) This won't be used if any of the other options
// are defined and work.
#define NNG_USE_DEVURANDOM 1
#endif
#endif
#ifndef NNG_USE_CLOCKID
#if defined(__APPLE__)
#define NNG_USE_CLOCKID CLOCK_REALTIME
#elif defined(CLOCK_MONOTONIC)
#define NNG_USE_CLOCKID CLOCK_MONOTONIC
#elif defined(CLOCK_REALTIME)
#define NNG_USE_CLOCKID CLOCK_REALTIME
#else
#define NNG_USE_GETTIMEOFDAY
#endif
#endif
#define NNG_USE_POSIX_RESOLV_GAI 1
#endif // NNG_PLATFORM_POSIX
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