diff options
Diffstat (limited to 'winsup/cygwin/fhandler_raw.cc')
| -rw-r--r-- | winsup/cygwin/fhandler_raw.cc | 33 |
1 files changed, 15 insertions, 18 deletions
diff --git a/winsup/cygwin/fhandler_raw.cc b/winsup/cygwin/fhandler_raw.cc index 61981a4da..cb8829559 100644 --- a/winsup/cygwin/fhandler_raw.cc +++ b/winsup/cygwin/fhandler_raw.cc @@ -11,6 +11,7 @@ #include "winsup.h" +#include <unistd.h> #include <cygwin/rdevio.h> #include <sys/mtio.h> #include <sys/param.h> @@ -151,36 +152,32 @@ fhandler_dev_raw::ioctl (unsigned int cmd, void *buf) mop.mt_count = op->rd_parm; ret = ioctl (MTIOCTOP, &mop); } - else if ((devbuf && ((op->rd_parm <= 1 && (devbufend - devbufstart)) - || op->rd_parm < devbufend - devbufstart)) - || (op->rd_parm > 1 && (op->rd_parm % 512)) + else if ((op->rd_parm <= 1 && get_major () != DEV_TAPE_MAJOR) + || (op->rd_parm > 1 && (op->rd_parm % devbufalign)) || (get_flags () & O_DIRECT)) - /* The conditions for a *valid* parameter are these: - - If there's still data in the current buffer, it must - fit in the new buffer. - - The new size is either 0 or 1, both indicating unbufferd - I/O, or the new buffersize must be a multiple of 512. + /* The conditions for a valid parameter are: + - The new size is either 0 or 1, both indicating unbuffered + I/O, and the device is a tape device. + - Or, the new buffersize must be a multiple of the + required buffer alignment. - In the O_DIRECT case, the whole request is invalid. */ ret = ERROR_INVALID_PARAMETER; else if (!devbuf || op->rd_parm != devbufsiz) { char *buf = NULL; + _off64_t curpos = lseek (0, SEEK_CUR); + if (op->rd_parm > 1L) - buf = new char [op->rd_parm]; - if (buf && devbufsiz > 1L) - { - memcpy (buf, devbuf + devbufstart, devbufend - devbufstart); - devbufend -= devbufstart; - } - else - devbufend = 0; + buf = new char [op->rd_parm + devbufalign]; if (devbufsiz > 1L) delete [] devbufalloc; - devbufstart = 0; - devbuf = buf; + devbufalloc = buf; + devbuf = (char *) roundup2 ((uintptr_t) buf, devbufalign); devbufsiz = op->rd_parm ?: 1L; + devbufstart = devbufend = 0; + lseek (curpos, SEEK_SET); } break; default: |