NAME

ferror, feof, clearerr, fileno − stream status inquiries

SYNOPSIS

#include <stdio.h>

ferror(stream)
FILE ∗stream;

feof(stream)
FILE ∗stream;

clearerr(stream)
FILE ∗stream;

fileno(stream)
FILE ∗stream;

DESCRIPTION

ferror() returns non-zero when an error has occurred reading from or writing to the named stream, otherwise zero.  Unless cleared by clearerr, the error indication lasts until the stream is closed. 

feof() returns non-zero when EOF has previously been detected reading the named input stream, otherwise zero.  Unless cleared by clearerr, the EOF indication lasts until the stream is closed; however, operations which attempt to read from the stream will ignore the current state of the EOF indication and attempt to read from the file descriptor associated with the stream. 

clearerr() resets the error indication and EOF indication to zero on the named stream. 

fileno() returns the integer file descriptor associated with the stream; see open(2V). 

NOTE

All these functions are implemented as macros; they cannot be redeclared. 

SEE ALSO

open(2V), fopen(3S)

Sun Release 4.0  —  Last change: 18 November 1987