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* fhandler.cc (is_at_eof): Drop static storage class. Drop err

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parameter since we don't change the Win32 error here anymore.
	(fhandler_base::raw_read): Accommodate change to is_at_eof.

	* fhandler_disk_file.cc (fhandler_disk_file::pread): In binary mode use
	direct call to NtReadFile, rather than lseek/read.
	(fhandler_disk_file::pwrite): In binary mode use direct call to
	NtWriteFile, rather than lseek/write.
This commit is contained in:
Corinna Vinschen
2011-05-05 09:05:04 +00:00
parent 03406c1ae6
commit 392323df55
3 changed files with 72 additions and 4 deletions
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58
winsup/cygwin/fhandler_disk_file.cc
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@ -1415,6 +1415,47 @@ out:
ssize_t __stdcall
fhandler_disk_file::pread (void *buf, size_t count, _off64_t offset)
{
/* In binary mode, we can use an atomic NtReadFile call. */
if (rbinary ())
{
extern int __stdcall is_at_eof (HANDLE h);
NTSTATUS status;
IO_STATUS_BLOCK io;
LARGE_INTEGER off = { QuadPart:offset };
status = NtReadFile (get_handle (), NULL, NULL, NULL, &io, buf, count,
&off, NULL);
if (!NT_SUCCESS (status))
{
if (pc.isdir ())
{
set_errno (EISDIR);
return -1;
}
if (status == (NTSTATUS) STATUS_ACCESS_VIOLATION)
{
if (is_at_eof (get_handle ()))
return 0;
switch (mmap_is_attached_or_noreserve (buf, count))
{
case MMAP_NORESERVE_COMMITED:
status = NtReadFile (get_handle (), NULL, NULL, NULL, &io,
buf, count, &off, NULL);
if (NT_SUCCESS (status))
return io.Information;
break;
case MMAP_RAISE_SIGBUS:
raise (SIGBUS);
default:
break;
}
}
__seterrno_from_nt_status (status);
return -1;
}
return io.Information;
}
/* Text mode stays slow and non-atomic. */
ssize_t res;
_off64_t curpos = lseek (0, SEEK_CUR);
if (curpos < 0 || lseek (offset, SEEK_SET) < 0)
@ -1435,6 +1476,23 @@ fhandler_disk_file::pread (void *buf, size_t count, _off64_t offset)
ssize_t __stdcall
fhandler_disk_file::pwrite (void *buf, size_t count, _off64_t offset)
{
/* In binary mode, we can use an atomic NtWriteFile call. */
if (wbinary ())
{
NTSTATUS status;
IO_STATUS_BLOCK io;
LARGE_INTEGER off = { QuadPart:offset };
status = NtWriteFile (get_handle (), NULL, NULL, NULL, &io, buf, count,
&off, NULL);
if (!NT_SUCCESS (status))
{
__seterrno_from_nt_status (status);
return -1;
}
return io.Information;
}
/* Text mode stays slow and non-atomic. */
int res;
_off64_t curpos = lseek (0, SEEK_CUR);
if (curpos < 0 || lseek (offset, SEEK_SET) < 0)