isastream(3)isastream(3)NAMEisastream - Determine if a file descriptor refers to a STREAMS file
SYNOPSIS
#include <stropts.h>
int isastream(
int fildes );
LIBRARY
Standard C Library (libc)
STANDARDS
Interfaces documented on this reference page conform to industry stan‐
dards as follows:
isastream(): XSH4.2, XSH5.0
Refer to the standards(5) reference page for more information about
industry standards and associated tags.
PARAMETERS
Specifies a file descriptor of an open STREAMS file.
DESCRIPTION
The isastream() function tests whether a file descriptor it encounters
is actually a STREAMS file.
RETURN VALUES
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 indi‐
cate the error.
ERRORS
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.
SEE ALSO
Functions: fattach(3), fdetach(3)
Interfaces: streamio(7)
Standards: standards(5)
Network Programmer's Guide
isastream(3)