isastream - Determines if a file descriptor refers to a STREAMS file
Standard C Library (libc.so, libc.a)
Interfaces documented on this reference page conform to industry standards as follows:
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 the error.
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)
Standards: standards(5) delim off