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// -*- C++ -*-
// $Id$
#include "ace/OS_NS_sys_uio.h"
ACE_RCSID(ace, OS_NS_sys_uio, "$Id$")
#if !defined (ACE_HAS_INLINED_OSCALLS)
# include "ace/OS_NS_sys_uio.inl"
#endif /* ACE_HAS_INLINED_OS_CALLS */
# if defined (ACE_LACKS_READV)
// "Fake" readv for operating systems without it. Note that this is
// thread-safe.
ssize_t
ACE_OS::readv_emulation (ACE_HANDLE handle,
ACE_READV_TYPE *iov,
int n)
{
ACE_OS_TRACE ("ACE_OS::readv_emulation");
ssize_t length = 0;
int i;
for (i = 0; i < n; i++)
if (ACE_static_cast (int, iov[i].iov_len) < 0)
return -1;
else
length += iov[i].iov_len;
char *buf;
# if defined (ACE_HAS_ALLOCA)
buf = (char *) alloca (length);
# else
ACE_NEW_RETURN (buf,
char[length],
-1);
# endif /* !defined (ACE_HAS_ALLOCA) */
length = ACE_OS::read (handle, buf, length);
if (length != -1)
{
char *ptr = buf;
ssize_t copyn = length;
for (i = 0;
i < n && copyn > 0;
i++)
{
ACE_OS::memcpy (iov[i].iov_base, ptr,
// iov_len is int on some platforms, size_t on others
copyn > (int) iov[i].iov_len
? (size_t) iov[i].iov_len
: (size_t) copyn);
ptr += iov[i].iov_len;
copyn -= iov[i].iov_len;
}
}
# if !defined (ACE_HAS_ALLOCA)
delete [] buf;
# endif /* !defined (ACE_HAS_ALLOCA) */
return length;
}
# endif /* ACE_LACKS_READV */
# if defined (ACE_LACKS_WRITEV)
// "Fake" writev for operating systems without it. Note that this is
// thread-safe.
int
ACE_OS::writev_emulation (ACE_HANDLE handle, ACE_WRITEV_TYPE iov[], int n)
{
ACE_OS_TRACE ("ACE_OS::writev_emulation");
size_t length = 0;
int i;
// Determine the total length of all the buffers in <iov>.
for (i = 0; i < n; i++)
if (ACE_static_cast (int, iov[i].iov_len) < 0)
return -1;
else
length += iov[i].iov_len;
char *buf;
# if defined (ACE_HAS_ALLOCA)
buf = (char *) alloca (length);
# else
ACE_NEW_RETURN (buf,
char[length],
-1);
# endif /* !defined (ACE_HAS_ALLOCA) */
char *ptr = buf;
for (i = 0; i < n; i++)
{
ACE_OS::memcpy (ptr, iov[i].iov_base, iov[i].iov_len);
ptr += iov[i].iov_len;
}
ssize_t result = ACE_OS::write (handle, buf, length);
# if !defined (ACE_HAS_ALLOCA)
delete [] buf;
# endif /* !defined (ACE_HAS_ALLOCA) */
return result;
}
# endif /* ACE_LACKS_WRITEV */
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