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* fhandler.cc (fhandler_base::write): In the lseek_bug case, set EOF

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before zero filling. Combine similar error handling statements.
This commit is contained in:
Corinna Vinschen 2004-08-28 15:46:57 +00:00
parent 2e41976b56
commit ddea76a66b
2 changed files with 26 additions and 16 deletions
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5
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,8 @@
2004-08-28 Pierre Humblet <pierre.humblet@ieee.org>
* fhandler.cc (fhandler_base::write): In the lseek_bug case, set EOF
before zero filling. Combine similar error handling statements.
2004-08-28 Pierre Humblet <pierre.humblet@ieee.org>
* syscalls.cc (ftruncate64): On 9x, call write with a zero length

37
winsup/cygwin/fhandler.cc
View File

@ -816,35 +816,40 @@ fhandler_base::write (const void *ptr, size_t len)
Note: this bug doesn't happen on NT4, even though the
documentation for WriteFile() says that it *may* happen
on any OS. */
/* Check there is enough space */
if (!SetEndOfFile (get_output_handle ()))
{
__seterrno ();
return -1;
}
char zeros[512];
int number_of_zeros_to_write = current_position - actual_length;
memset (zeros, 0, 512);
SetFilePointer (get_output_handle (), 0, NULL, FILE_END);
SetFilePointer (get_output_handle (), actual_length, NULL,
FILE_BEGIN);
while (number_of_zeros_to_write > 0)
{
DWORD zeros_this_time = (number_of_zeros_to_write > 512
? 512 : number_of_zeros_to_write);
DWORD written;
if (!WriteFile (get_output_handle (), zeros, zeros_this_time,
&written, NULL))
DWORD ret = WriteFile (get_output_handle (), zeros,
zeros_this_time, &written, NULL);
if (!ret || written < zeros_this_time)
{
__seterrno ();
if (get_errno () == EPIPE)
raise (SIGPIPE);
if (!ret)
{
__seterrno ();
if (get_errno () == EPIPE)
raise (SIGPIPE);
}
else
set_errno (ENOSPC);
/* This might fail, but it's the best we can hope for */
SetFilePointer (get_output_handle (), current_position, NULL,
FILE_BEGIN);
SetFilePointer (get_output_handle (), current_position,
NULL, FILE_BEGIN);
return -1;
}
if (written < zeros_this_time) /* just in case */
{
set_errno (ENOSPC);
/* This might fail, but it's the best we can hope for */
SetFilePointer (get_output_handle (), current_position, NULL,
FILE_BEGIN);
return -1;
}
number_of_zeros_to_write -= written;
}
}