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fileno
Langue: en
Version: 2008-08-29 (debian - 07/07/09)
Section: 3 (Bibliothèques de fonctions)
NAME
clearerr, feof, ferror, fileno - check and reset stream statusSYNOPSIS
#include <stdio.h>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
DESCRIPTION
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 non-zero if it is set. The end-of-file indicator can only be cleared by the function clearerr().
The function ferror() tests the error indicator for the stream pointed to by stream, returning non-zero if it is set. The error indicator can only be reset by the clearerr() function.
The function fileno() examines the argument stream and returns its integer descriptor.
For non-locking counterparts, see unlocked_stdio(3).
ERRORS
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.)CONFORMING TO
The functions clearerr(), feof(), and ferror() conform to C89 and C99.SEE ALSO
open(2), fdopen(3), stdio(3), unlocked_stdio(3)COLOPHON
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