[Bug libc/10932] libio use isatty() but don't take care of -ENOTTY

["yann at droneaud dot fr" <sourceware-bugzilla at sourceware dot org>]

------- Additional Comments From yann at droneaud dot fr  2009-11-09 16:59 -------
Created an attachment (id=4371)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=4371&action=view)
Proposed test case

Here is a test case which try fscanf() and fgetc() on an any filename given as
argument.

Here are some outputs from the test case:

  $ ./stdio-errno /dev/null
  >>> fscanf() failed: 25 Inappropriate ioctl for device
  fscanf() returned EOF
  >>> fgetc() failed: 25 Inappropriate ioctl for device
  fgetc() returned EOF

  $ ./stdio-errno /dev/zero
  fscanf() failed to parse anything
  >>> fgetc() failed: 25 Inappropriate ioctl for device
  fgetc() returned 0 (0x00000000)

In case of error or EOF, fscanf() is supposed to return EOF. 

But when reading /dev/null, EOF is returned, but errno is set to something
different than 0, eg ENOTTY. This is not usable to distinguish valid EOF.

When reading /dev/zero, fgetc() return 0 which is OK, but set errno to ENOTTY.


-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=10932

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