Manpage of FERROR
FERRORSection: Linux Programmer's Manual (3)
NAMEclearerr, feof, ferror, fileno - check and reset stream status
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)):
DESCRIPTIONThe 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 streamand returns its integer file descriptor.
For nonlocking counterparts, see unlocked_stdio(3).
ERRORSThese 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 errnoto EBADF.)
ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7).
CONFORMING TOThe functions clearerr(), feof(), and ferror() conform to C89, C99, POSIX.1-2001, and POSIX.1-2008.
SEE ALSOopen(2), fdopen(3), stdio(3), unlocked_stdio(3)
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