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POSIX_SPAWN_FILE_ACTIONS_ADPOSIX(ProgrammePOSIX_SPAWN_FILE_ACTIONS_ADDDUP2(3P)



PROLOG
       This manual page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may dif-
       fer (consult the corresponding Linux manual page for details of Linux behavior), or the interface  may  not  be
       implemented on Linux.

NAME
       posix_spawn_file_actions_adddup2 - add dup2 action to spawn file actions object (ADVANCED REALTIME)

SYNOPSIS
       #include <spawn.h>

       int posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t *
              file_actions, int fildes, int newfildes);


DESCRIPTION
       The  posix_spawn_file_actions_adddup2()  function  shall  add  a  dup2()  action  to  the  object referenced by
       file_actions that shall cause the file descriptor fildes to be duplicated as newfildes  (as  if  dup2(  fildes,
       newfildes) had been called) when a new process is spawned using this file actions object.

       A spawn file actions object is as defined in posix_spawn_file_actions_addclose() .

RETURN VALUE
       Upon  successful  completion,  the posix_spawn_file_actions_adddup2() function shall return zero; otherwise, an
       error number shall be returned to indicate the error.

ERRORS
       The posix_spawn_file_actions_adddup2() function shall fail if:

       EBADF  The value specified by fildes or newfildes is negative or greater than or equal to {OPEN_MAX}.

       ENOMEM Insufficient memory exists to add to the spawn file actions object.


       The posix_spawn_file_actions_adddup2() function may fail if:

       EINVAL The value specified by file_actions is invalid.


       It shall not be considered an error for the fildes argument passed  to  the  posix_spawn_file_actions_adddup2()
       function  to  specify a file descriptor for which the specified operation could not be performed at the time of
       the call. Any such error will be detected when the associated file  actions  object  is  later  used  during  a
       posix_spawn() or posix_spawnp() operation.

       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       The  posix_spawn_file_actions_adddup2()  function  is  part of the Spawn option and need not be provided on all
       implementations.

RATIONALE
       Refer to the RATIONALE in posix_spawn_file_actions_addclose() .

FUTURE DIRECTIONS
       None.

SEE ALSO
       dup(), posix_spawn(), posix_spawn_file_actions_addclose(), posix_spawn_file_actions_destroy(),  posix_spawnp(),
       the Base Definitions volume of IEEE Std 1003.1-2001, <spawn.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Stan-
       dard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base  Specifica-
       tions  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 Stan-
       dard,  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 .



IEEE/The Open Group                  2003 POSIX_SPAWN_FILE_ACTIONS_ADDDUP2(3P)