|| POSIX Programmer's Manual
PROLOG This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface may differ (consult the corresponding Linux manual page for details of Linux behavior), or the interface may not be implemented on Linux.
NAME isastream - test a file descriptor (
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.
() function shall fail if:
fildes argument is not a valid open file descriptor.
The following sections are informative.
APPLICATION USAGE None.
FUTURE DIRECTIONS None.
SEE ALSO The Base Definitions volume of IEEE Std 1003.1-2001,
COPYRIGHT Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained online at http://www.opengroup.org/unix/online.html .