FERROR(3S)							    FERROR(3S)

NAME    [Toc]    [Back]

     ferror, feof, clearerr, fileno - stream status inquiries

SYNOPSIS    [Toc]    [Back]

     #include <stdio.h>

     int ferror	(FILE *stream);

     int feof (FILE *stream);

     void clearerr (FILE *stream);

     int fileno	(FILE *stream);

DESCRIPTION    [Toc]    [Back]

     ferror returns non-zero when an I/O error has previously occurred reading
     from or writing to	the named stream, otherwise zero.

     feof returns non-zero when	EOF has	previously been	detected reading the
     named input stream, otherwise zero.

     clearerr resets the error indicator and EOF indicator to zero on the
     named stream.

     fileno returns the	integer	file descriptor	associated with	the named
     stream (see below for common file descriptors, and	open(2)	for general
     information on file descriptors.)

     The following symbolic values in <unistd.h> define	the file descriptors
     that are associated with the C language stdin, stdout, and	stderr when an
     application is started:

	  Name		 Description		  Value
     STDIN_FILENO   Standard input value, stdin	    0
     STDOUT_FILENO  Standard output value, stdout   1
     STDERR_FILENO  Standard error value, stderr    2

NOTES    [Toc]    [Back]

     All of these functions are	implemented both as functions in the C library
     and as macros in <stdio.h>.

SEE ALSO    [Toc]    [Back]

     open(2), fopen(3S), stdio(3S).


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