Check to see if a read is likely to succeed
#include <unix.h> int rdchk( int fd );
- The file descriptor that you want to check.
Use the -l c option to qcc to link against this library. This library is usually included automatically.
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).
- The fd argument isn't the file descriptor for a character device.
Last modified: 2014-06-24