The Open Group Base Specifications Issue 7
IEEE Std 1003.1, 2013 Edition
Copyright © 2001-2013 The IEEE and The Open Group

#### NAME

> isastream - test a file descriptor (STREAMS)

#### SYNOPSIS

> ``[OB XSR] #include <stropts.h>
> int isastream(int` fildes`);``
> `
> `

#### DESCRIPTION

> The isastream() function shall test whether fildes, an open file descriptor, is associated with a STREAMS-based file.

#### RETURN VALUE

> Upon successful completion, isastream() shall return 1 if fildes refers to a STREAMS-based file and 0 if not. Otherwise, isastream() shall return -1 and set errno to indicate the error.

#### ERRORS

> The isastream() function shall fail if:

> [EBADF]
>   The fildes argument is not a valid open file descriptor.

The following sections are informative.

#### EXAMPLES

> None.

#### APPLICATION USAGE

> None.

#### RATIONALE

> None.

#### FUTURE DIRECTIONS

> The isastream() function may be removed in a future version.

#### SEE ALSO

> XBD <stropts.h>

#### CHANGE HISTORY

> First released in Issue 4, Version 2.

#### Issue 5

> Moved from X/OPEN UNIX extension to BASE.

#### Issue 7

> The isastream() function is marked obsolescent.

End of informative text.

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