rdchk()

Check to see if a read is likely to succeed

Synopsis:

#include <unix.h>

int rdchk( int fd );

Library:

libc

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.

Errors:

ENOTTY

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

Classification:

Unix

See also:

tcischars()