void clearerr(FILE *stream);
int feof(FILE *stream);
int ferror(FILE *stream);
int fileno(FILE *stream);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
fileno(): _POSIX_C_SOURCE >= 1 || _XOPEN_SOURCE || _POSIX_SOURCE
The function clearerr() clears the end-of-file and error indicators for
the stream pointed to by stream.
The function feof() tests the end-of-file indicator for the stream
pointed to by stream, returning nonzero if it is set. The end-of-file
indicator can be cleared only by the function clearerr().
The function ferror() tests 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 clearerr() function.
The function fileno() examines the argument stream and returns its
For nonlocking counterparts, see unlocked_stdio(3).
These functions should not fail and do not set the external variable
errno. (However, in case fileno() detects that its argument is not a
valid stream, it must return -1 and set errno to EBADF.)
Multithreading (see pthreads(7))
The clearerr(), feof(), ferror(), and fileno() functions are thread-
The functions clearerr(), feof(), and ferror() conform to C89 and C99.
open(2), fdopen(3), stdio(3), unlocked_stdio(3)
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