Section (3) ferror
clearerr, feof, ferror, fileno — check and reset stream status
clears the end-of-file and error indicators for the stream
pointed to by
the end-of-file indicator for the stream pointed to by
nonzero if it is set. The end-of-file indicator can be
cleared only by the function
the error indicator for the stream pointed to by
stream, returning nonzero if it
is set. The error indicator can be reset only by the
examines the argument
stream and returns the integer
file descriptor used to implement this stream. The file
descriptor is still owned by
stream and will be closed when
fclose(3) is called.
Duplicate the file descriptor with dup(2) before passing it to
code that might close it.
For nonlocking counterparts, see unlocked_stdio(3).
These functions should not fail and do not set the
(However, in case
detects that its argument is not a valid stream, it must
return −1 and set
For an explanation of the terms used in this section, see attributes(7).
ferror() conform to C89, C99, POSIX.1-2001,
conforms to POSIX.1-2001 and POSIX.1-2008.
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(#)ferror.3 6.8 (Berkeley) 6/29/91
Converted for Linux, Mon Nov 29 14:24:40 1993, faithcs.unc.edu
Added remark on EBADF for fileno, aeb, 2001-03-22