1ISASTREAM(3P)              POSIX Programmer's Manual             ISASTREAM(3P)
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PROLOG

6       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
7       implementation of this interface may differ (consult the  corresponding
8       Linux  manual page for details of Linux behavior), or the interface may
9       not be implemented on Linux.
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NAME

13       isastream — test a file descriptor (STREAMS)
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SYNOPSIS

16       #include <stropts.h>
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18       int isastream(int fildes);
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DESCRIPTION

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

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

30       The isastream() function shall fail if:
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32       EBADF  The fildes argument is not a valid open file descriptor.
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34       The following sections are informative.
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EXAMPLES

37       None.
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APPLICATION USAGE

40       None.
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RATIONALE

43       None.
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FUTURE DIRECTIONS

46       The isastream() function may be removed in a future version.
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SEE ALSO

49       The Base Definitions volume of POSIX.1‐2008, <stropts.h>
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52       Portions  of  this text are reprinted and reproduced in electronic form
53       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
54       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
55       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri‐
56       cal  and  Electronics  Engineers,  Inc  and  The  Open Group.  (This is
57       POSIX.1-2008 with the 2013 Technical Corrigendum  1  applied.)  In  the
58       event of any discrepancy between this version and the original IEEE and
59       The Open Group Standard, the original IEEE and The Open Group  Standard
60       is  the  referee document. The original Standard can be obtained online
61       at http://www.unix.org/online.html .
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63       Any typographical or formatting errors that appear  in  this  page  are
64       most likely to have been introduced during the conversion of the source
65       files to man page format. To report such errors,  see  https://www.ker‐
66       nel.org/doc/man-pages/reporting_bugs.html .
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70IEEE/The Open Group                  2013                        ISASTREAM(3P)
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