Initial

README.md

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+libent is a simple cross-platform entropy gathering library. It tries
+to use the best available source of randomness, and is meant to be used
+in applications that need high-quality entropy, e.g. for generating
+cryptographic keys.

include/ent/detail.h

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+#ifndef _LIBENT_DETAIL_H
+#define _LIBENT_DETAIL_H
+
+#if defined _WIN32 || defined __CYGWIN__
+# ifdef WIN_EXPORT
+#  ifdef __GNUC__
+#   define ENT_EXPORT __attribute__ ((dllexport))
+#  else
+#   define ENT_EXPORT __declspec(dllexport)
+#  endif
+# else
+#  ifdef __GNUC__
+#   define ENT_EXPORT __attribute__ ((dllimport))
+#  else
+#   define ENT_EXPORT __declspec(dllimport)
+#  endif
+# endif
+#else
+# if __GNUC__ >= 4
+#  define ENT_EXPORT __attribute__ ((visibility ("default")))
+# else
+#  define ENT_EXPORT
+# endif
+#endif
+
+#endif /* _LIBENT_DETAIL_H */

include/ent/ent.h

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+#ifndef _LIBENT_ENT_H
+#define _LIBENT_ENT_H
+
+#include <stddef.h>
+
+#include <ent/detail.h>
+
+ENT_EXPORT
+int
+ent_getentropy(void *buf, size_t buflen);
+
+#endif /* _LIBENT_ENT_H */

meson.build

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+project('libent', 'c', 'cpp',
+        default_options : ['c_std=c99', 'cpp_std=c++11'],
+        version : '0.0.1',
+        license : 'MIT')
+
+inc = include_directories('include')
+
+install_headers('include/ent/ent.h', subdir : 'ent')
+
+ent_sources = ['src/ent.c']
+libent = shared_library('ent',
+                        ent_sources,
+                        include_directories : inc,
+                        install : true)
+
+pkg_mod = import('pkgconfig')
+pkg_mod.generate(libraries : libent,
+                 version : '0.0',
+                 name : 'libent',
+                 filebase : 'ent',
+                 description : 'A library to get entropy.')

src/ent.c

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+#include <ent/ent.h>
+
+#if defined __OPENBSD__ || (defined __linux__ && defined _DEFAULT_SOURCE)
+# include <unistd.h>
+# define getentropy_impl getentropy
+#elif defined __APPLE__ && defined __MACH__
+# include <sys/random.h>
+# define getentropy_impl getentropy
+#else
+# error "Port: getentropy unimplemented"
+#endif
+
+int
+ent_getentropy(void *buf, size_t buflen)
+{
+  return getentropy_impl(buf, buflen);
+}