ISASTREAM(3)               POSIX Programmer's Manual              ISASTREAM(3)



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

NNAAMMEE
       isastream -- test a file descriptor (SSTTRREEAAMMSS)

SSYYNNOOPPSSIISS
       #include <stropts.h>

       int isastream(int _f_i_l_d_e_s);

DDEESSCCRRIIPPTTIIOONN
       The _i_s_a_s_t_r_e_a_m() function shall test whether _f_i_l_d_e_s, an open file
       descriptor, is associated with a STREAMS-based file.

RREETTUURRNN VVAALLUUEE
       Upon successful completion, _i_s_a_s_t_r_e_a_m() shall return 1 if _f_i_l_d_e_s refers
       to a STREAMS-based file and 0 if not. Otherwise, _i_s_a_s_t_r_e_a_m() shall
       return -1 and set _e_r_r_n_o to indicate the error.

EERRRROORRSS
       The _i_s_a_s_t_r_e_a_m() function shall fail if:

       EEBBAADDFF  The _f_i_l_d_e_s argument is not a valid open file descriptor.

       _T_h_e _f_o_l_l_o_w_i_n_g _s_e_c_t_i_o_n_s _a_r_e _i_n_f_o_r_m_a_t_i_v_e_.

EEXXAAMMPPLLEESS
       None.

AAPPPPLLIICCAATTIIOONN UUSSAAGGEE
       None.

RRAATTIIOONNAALLEE
       None.

FFUUTTUURREE DDIIRREECCTTIIOONNSS
       The _i_s_a_s_t_r_e_a_m() function may be removed in a future version.

SSEEEE AALLSSOO
       The Base Definitions volume of POSIX.1-2017, <<ssttrrooppttss..hh>>

CCOOPPYYRRIIGGHHTT
       Portions of this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1-2017, Standard for Information Technology --
       Portable Operating System Interface (POSIX), The Open Group Base
       Specifications Issue 7, 2018 Edition, Copyright (C) 2018 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 .

       Any typographical or formatting errors that appear in this page are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see
       https://www.kernel.org/doc/man-pages/reporting_bugs.html .



IEEE/The Open Group                  2017                         ISASTREAM(3)
