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These
functions operate on the system file descriptors for terminal type devices.
These descriptors are not related to the standard typedef, but refer
to the special device files found in and named and for which an entry
exists in the initialization file (See The function determines if the
file descriptor refers to a valid terminal type device. The function
gets the related device name of a file descriptor for which is true The
function fetches the current process’ control terminal number from the
file entry.
The function returns the null terminated name
if the device is found and is true; otherwise a pointer is returned.
The function returns the unit number of the device file if found; otherwise
the value zero is returned.
A and function
appeared in
The function leaves its result in an internal static
object and returns a pointer to that object. Subsequent calls to will modify
the same object.
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