1FERROR(3)                  Linux Programmer's Manual                 FERROR(3)
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NAME

6       clearerr, feof, ferror, fileno - check and reset stream status
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SYNOPSIS

9       #include <stdio.h>
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11       void clearerr(FILE *stream);
12       int feof(FILE *stream);
13       int ferror(FILE *stream);
14       int fileno(FILE *stream);
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DESCRIPTION

17       The function clearerr() clears the end-of-file and error indicators for
18       the stream pointed to by stream.
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20       The function feof() tests the  end-of-file  indicator  for  the  stream
21       pointed to by stream, returning non-zero if it is set.  The end-of-file
22       indicator can only be cleared by the function clearerr().
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24       The function ferror() tests the error indicator for the stream  pointed
25       to by stream, returning non-zero if it is set.  The error indicator can
26       only be reset by the clearerr() function.
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28       The function fileno() examines the  argument  stream  and  returns  its
29       integer descriptor.
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31       For non-locking counterparts, see unlocked_stdio(3).
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ERRORS

34       These  functions  should  not fail and do not set the external variable
35       errno.  (However, in case fileno() detects that its argument is  not  a
36       valid stream, it must return -1 and set errno to EBADF.)
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CONFORMING TO

39       The functions clearerr(), feof(), and ferror() conform to C89 and C99.
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SEE ALSO

42       open(2), fdopen(3), stdio(3), unlocked_stdio(3)
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46                                  2001-10-16                         FERROR(3)