isastream - Determine if a file descriptor refers to a
int fildes );
Standard C Library (libc)
Interfaces documented on this reference page conform to
industry standards as follows:
isastream(): XSH4.2, XSH5.0
Refer to the standards(5) reference page for more information
about industry standards and associated tags.
Specifies a file descriptor of an open STREAMS file.
The isastream() function tests whether a file descriptor
it encounters is actually a STREAMS file.
Upon successful completion, the isastream() function
returns a value of 1 when the file descriptor of the open
file specified by fildes is a STREAMS file, and it returns
a value of 0 (zero) if it is not a STREAMS file. Otherwise,
a value of -1 is returned, and errno is set to indicate
If any of the following conditions occur, the isastream()
function sets errno to the corresponding value: The specified
file descriptor does not refer to a valid open file.
Functions: fattach(3), fdetach(3)
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