rdchk()

Check to see if a read is likely to succeed

#include <unix.h>

int rdchk( int fd );

Arguments:

fd

The file descriptor that you want to check.

Library:

libc

Use the -l c option to qcc to link against this library. This library is usually included automatically.

Description:

The rdchk() function checks to see if a read from the file descriptor, fd, is likely to succeed.

Returns:

The number of characters waiting to be read, or -1 if an error occurred (errno is set).

Errors:

ENOTTY

The fd argument isn't the file descriptor for a character device.

Classification:

Unix