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.