rdchk()

Check to see if a read is likely to succeed

Synopsis:

#include <unix.h>

int rdchk( int fd );

libc

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

Note: This function is in libc.a, but not in libc.so (in order to save space).

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

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