NAME

LIBRARY

SYNOPSIS

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 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

SEE ALSO

STANDARDS