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Implement getentropy for Cygwin

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* miscfuncs.cc (getentropy): Move fhandler_dev_random::crypt_gen_random
	here and rename to getentropy.  Fix type and return values to match
	getentropy requirements.
	* miscfuncs.h (getentropy): Add prototype.
	* fhandler.h (fhandler_dev_random::crypt_gen_random): Remove prototype.
	* fhandler_random.cc (fhandler_dev_random::crypt_gen_random): Drop.
	(fhandler_dev_random::write): Use getentropy instead.
	(fhandler_dev_random::read): Ditto.
	* fhandler_socket.cc (fhandler_socket::af_local_set_secret): Ditto.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen
2016-03-18 14:46:20 +01:00
parent e0fc33322d
commit dcf31cdc99
5 changed files with 27 additions and 30 deletions
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19
winsup/cygwin/miscfuncs.cc
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@@ -236,6 +236,25 @@ check_iovec (const struct iovec *iov, int iovcnt, bool forwrite)
return -1;
}
/* There's a bug in ntsecapi.h (Mingw as well as MSFT). SystemFunction036
is, in fact, a WINAPI function, but it's not defined as such. Therefore
we have to do it correctly here. */
#define RtlGenRandom SystemFunction036
extern "C" BOOLEAN WINAPI RtlGenRandom (PVOID, ULONG);
/* Used by arc2random, fhandler_socket and fhandler_random. */
extern "C" int
getentropy (void *ptr, size_t len)
{
if (!RtlGenRandom (ptr, len))
{
debug_printf ("%E = RtlGenRandom()");
set_errno (EIO);
return -1;
}
return 0;
}
/* Try hard to schedule another thread.
Remember not to call this in a lock condition or you'll potentially
suffer starvation. */