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Move getentropy/getrandom into own file

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Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen
2017-01-19 20:58:06 +01:00
parent e6e66224f3
commit bbf6993a2d
3 changed files with 71 additions and 57 deletions
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57
winsup/cygwin/miscfuncs.cc
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@@ -14,7 +14,6 @@ details. */
#include <alloca.h>
#include <limits.h>
#include <sys/param.h>
#include <sys/random.h>
#include <wchar.h>
#include "cygtls.h"
#include "ntdll.h"
@@ -235,62 +234,6 @@ check_iovec (const struct iovec *iov, int iovcnt, bool forwrite)
return -1;
}
extern "C" int
getentropy (void *ptr, size_t len)
{
/* Per BSD man page: The maximum buffer size permitted is 256 bytes.
If buflen exceeds this, an error of EIO will be indicated. */
if (len > 256)
{
debug_printf ("len (%U) > 256", len);
set_errno (EIO);
return -1;
}
__try
{
if (!RtlGenRandom (ptr, len))
{
debug_printf ("RtlGenRandom() = FALSE");
set_errno (EIO);
return -1;
}
}
__except (EFAULT)
{
return -1;
}
__endtry
return 0;
}
extern "C" ssize_t
getrandom (void *ptr, size_t len, unsigned int flags)
{
if (flags & ~(GRND_NONBLOCK | GRND_RANDOM))
{
debug_printf ("invalid flags: %y", flags);
set_errno (EINVAL);
return -1;
}
/* Max. bytes returned by Linux call. */
len = MAX (len, (flags & GRND_RANDOM) ? 512 : 33554431);
__try
{
if (!RtlGenRandom (ptr, len))
{
debug_printf ("RtlGenRandom() = FALSE");
set_errno (EIO);
return -1;
}
}
__except (EFAULT)
{
return -1;
}
__endtry
return len;
}
/* Try hard to schedule another thread.
Remember not to call this in a lock condition or you'll potentially
suffer starvation. */