man3p/isastream.3p

   1 .\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved
   2 .TH "ISASTREAM" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
   3 .\" isastream
   4 .SH NAME
   5 isastream \- test a file descriptor (\fBSTREAMS\fP)
   6 .SH SYNOPSIS
   7 .LP
   8 \fB#include <stropts.h>
   9 .br
  10 .sp
  11 int isastream(int\fP \fIfildes\fP\fB); \fP
  12 \fB
  13 .br
  14 \fP
  15 .SH DESCRIPTION
  16 .LP
  17 The \fIisastream\fP() function shall test whether \fIfildes\fP, an
  18 open file descriptor, is associated with a STREAMS-based
  19 file.
  20 .SH RETURN VALUE
  21 .LP
  22 Upon successful completion, \fIisastream\fP() shall return 1 if \fIfildes\fP
  23 refers to a STREAMS-based file and 0 if not.
  24 Otherwise, \fIisastream\fP() shall return -1 and set \fIerrno\fP to
  25 indicate the error.
  26 .SH ERRORS
  27 .LP
  28 The \fIisastream\fP() function shall fail if:
  29 .TP 7
  30 .B EBADF
  31 The \fIfildes\fP argument is not a valid open file descriptor.
  32 .sp
  33 .LP
  34 \fIThe following sections are informative.\fP
  35 .SH EXAMPLES
  36 .LP
  37 None.
  38 .SH APPLICATION USAGE
  39 .LP
  40 None.
  41 .SH RATIONALE
  42 .LP
  43 None.
  44 .SH FUTURE DIRECTIONS
  45 .LP
  46 None.
  47 .SH SEE ALSO
  48 .LP
  49 The Base Definitions volume of IEEE\ Std\ 1003.1-2001, \fI<stropts.h>\fP
  50 .SH COPYRIGHT
  51 Portions of this text are reprinted and reproduced in electronic form
  52 from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
  53 -- Portable Operating System Interface (POSIX), The Open Group Base
  54 Specifications Issue 6, Copyright (C) 2001-2003 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 at
  59 http://www.opengroup.org/unix/online.html .