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Man Pages


Manual Reference Pages  -  FERROR_UNLOCKED (3)

NAME

clearerr, clearerr_unlocked, feof, feof_unlocked, ferror, ferror_unlocked, fileno, fileno_unlocked - check and reset stream status

CONTENTS

Library
Synopsis
Description
Errors
See Also
Standards

LIBRARY


.Lb libc

SYNOPSIS


.In stdio.h void clearerr FILE *stream void clearerr_unlocked FILE *stream int feof FILE *stream int feof_unlocked FILE *stream int ferror FILE *stream int ferror_unlocked FILE *stream int fileno FILE *stream int fileno_unlocked FILE *stream

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 may be cleared by explicitly calling clearerr, or as a side-effect of other operations, e.g. fseek.

The function ferror tests the error indicator for the stream pointed to by stream, returning non-zero if it is set.

The function fileno examines the argument stream and returns its integer descriptor.

The clearerr_unlocked, feof_unlocked, ferror_unlocked, and fileno_unlocked functions are equivalent to clearerr, feof, ferror, and fileno respectively, except that the caller is responsible for locking the stream with flockfile(3) before calling them. These functions may be used to avoid the overhead of locking the stream and to prevent races when multiple threads are operating on the same stream.

ERRORS

These functions should not fail and do not set the external variable errno.

SEE ALSO

open(2), fdopen(3), flockfile(3), stdio(3)

STANDARDS

The functions clearerr, feof, and ferror conform to -isoC.
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