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* fhandler_raw.cc (write_file, read_file): New wrapper functions

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for WriteFile and ReadFile to get rid of ERROR_MEDIA_CHANGED
        and ERROR_BUS_RESET in case of first access to tape.
        (fhandler_dev_raw::raw_write): Use write_file instead of WriteFile.
        (fhandler_dev_raw::raw_read): Use read_file instead of ReadFile.
This commit is contained in:
Corinna Vinschen 2000-05-12 18:34:50 +00:00
parent c2644effa8
commit 5640cadbc5
2 changed files with 59 additions and 22 deletions
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8
winsup/cygwin/ChangeLog
View File

@ -1,3 +1,11 @@
Fri May 12 20:31:00 2000 Corinna Vinschen <corinna@vinschen.de>
* fhandler_raw.cc (write_file, read_file): New wrapper functions
for WriteFile and ReadFile to get rid of ERROR_MEDIA_CHANGED
and ERROR_BUS_RESET in case of first access to tape.
(fhandler_dev_raw::raw_write): Use write_file instead of WriteFile.
(fhandler_dev_raw::raw_read): Use read_file instead of ReadFile.
Fri May 12 01:04:57 2000 Christopher Faylor <cgf@cygnus.com>
* Makefile.in (DLL_OFILES): Sort.

73
winsup/cygwin/fhandler_raw.cc
View File

@ -17,6 +17,52 @@
#include <cygwin/rdevio.h>
#include <sys/mtio.h>
/* static wrapper functions to hide the effect of media changes and
bus resets which occurs after a new media is inserted. This is
also related to the used tape device. */
static BOOL write_file (HANDLE fh, const void *buf, DWORD to_write,
DWORD *written, int *err)
{
BOOL ret;
*err = 0;
if (!(ret = WriteFile (fh, buf, to_write, written, 0)))
{
if ((*err = GetLastError ()) == ERROR_MEDIA_CHANGED
|| *err == ERROR_BUS_RESET)
{
*err = 0;
if (!(ret = WriteFile (fh, buf, to_write, written, 0)))
*err = GetLastError ();
}
}
syscall_printf ("%d (err %d) = WriteFile (%d, %d, write %d, written %d, 0)\n",
ret, *err, fh, buf, to_write, *written);
return ret;
}
static BOOL read_file (HANDLE fh, void *buf, DWORD to_read,
DWORD *read, int *err)
{
BOOL ret;
*err = 0;
if (!(ret = ReadFile(fh, buf, to_read, read, 0)))
{
if ((*err = GetLastError ()) == ERROR_MEDIA_CHANGED
|| *err == ERROR_BUS_RESET)
{
*err = 0;
if (!(ret = ReadFile (fh, buf, to_read, read, 0)))
*err = GetLastError ();
}
}
syscall_printf ("%d (err %d) = ReadFile (%d, %d, to_read %d, read %d, 0)\n",
ret, *err, fh, buf, to_read, *read);
return ret;
}
/**********************************************************************/
/* fhandler_dev_raw */
@ -45,18 +91,13 @@ fhandler_dev_raw::writebuf (void)
DWORD to_write = ((devbufend - 1) / 512 + 1) * 512;
ret = 0;
if (!WriteFile (get_handle (), devbuf, to_write, &written, 0))
if (!write_file (get_handle (), devbuf, to_write, &written, &ret))
{
ret = GetLastError ();
if (is_eom (ret))
eom_detected = 1;
}
if (written)
has_written = 1;
syscall_printf ("%d = WriteFile(%d, %d, write %d, written %d, 0)\n",
ret, get_handle (), devbuf, to_write, written);
devbufstart = devbufend = 0;
}
is_writing = 0;
@ -208,11 +249,8 @@ fhandler_dev_raw::raw_read (void *ptr, size_t ulen)
debug_printf ("read %d bytes from file into buffer\n",
bytes_to_read);
}
if (!ReadFile (get_handle (), tgt, bytes_to_read, &read2, 0))
if (!read_file (get_handle (), tgt, bytes_to_read, &read2, &ret))
{
ret = GetLastError ();
syscall_printf ("ReadFile %s failed with error %d\n",
get_name (), ret);
if (!is_eof (ret) && !is_eom (ret))
{
debug_printf ("return -1, set errno to EACCES");
@ -253,11 +291,8 @@ fhandler_dev_raw::raw_read (void *ptr, size_t ulen)
}
}
}
else if (!ReadFile (get_handle (), ptr, len, &bytes_read, 0))
else if (!read_file (get_handle (), ptr, len, &bytes_read, &ret))
{
ret = GetLastError ();
syscall_printf ("ReadFile %s failed with error %d\n",
get_name (), ret);
if (!is_eof (ret) && !is_eom (ret))
{
debug_printf ("return -1, set errno to EACCES");
@ -330,10 +365,7 @@ fhandler_dev_raw::raw_write (const void *ptr, size_t len)
}
ret = 0;
if (!WriteFile (get_handle (), tgt, bytes_to_write, &written, 0))
ret = GetLastError ();
syscall_printf ("%d = WriteFile(%d, %d, write %d, written %d, 0)\n",
ret, get_handle (), tgt, bytes_to_write, written);
write_file (get_handle (), tgt, bytes_to_write, &written, &ret);
if (written)
has_written = 1;
@ -376,11 +408,8 @@ fhandler_dev_raw::raw_write (const void *ptr, size_t len)
}
else if (len > 0)
{
if (!WriteFile (get_handle (), ptr, len, &bytes_written, 0))
if (!write_file (get_handle (), ptr, len, &bytes_written, &ret))
{
ret = GetLastError ();
syscall_printf ("WriteFile %s failed with error %d\n",
get_name (), ret);
if (bytes_written)
has_written = 1;
if (!is_eom (ret))