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

12       isastream — test a file descriptor (STREAMS)
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SYNOPSIS

15       #include <stropts.h>
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17       int isastream(int fildes);
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DESCRIPTION

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

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

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

36       None.
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APPLICATION USAGE

39       None.
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RATIONALE

42       None.
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FUTURE DIRECTIONS

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

48       The Base Definitions volume of POSIX.1‐2017, <stropts.h>
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51       Portions  of  this text are reprinted and reproduced in electronic form
52       from IEEE Std 1003.1-2017, Standard for Information Technology --  Por‐
53       table  Operating System Interface (POSIX), The Open Group Base Specifi‐
54       cations Issue 7, 2018 Edition, Copyright (C) 2018 by the  Institute  of
55       Electrical  and  Electronics Engineers, Inc and The Open Group.  In the
56       event of any discrepancy between this version and the original IEEE and
57       The  Open Group Standard, the original IEEE and The Open Group Standard
58       is the referee document. The original Standard can be  obtained  online
59       at http://www.opengroup.org/unix/online.html .
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61       Any  typographical  or  formatting  errors that appear in this page are
62       most likely to have been introduced during the conversion of the source
63       files  to  man page format. To report such errors, see https://www.ker‐
64       nel.org/doc/man-pages/reporting_bugs.html .
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68IEEE/The Open Group                  2017                        ISASTREAM(3P)
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