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,  Standard  for Information Technology -- Portable Operating System
       Interface (POSIX), The Open Group Base Specifications 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
       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 .