POSIX_SPAWN_FILE_ACTIONS_ADDDUP2(P) POSIX Programmer's Manual POSIX_SPAWN_FILE_ACTIONS_ADDDUP2(P)
posix_spawn_file_actions_adddup2 - add dup2 action to spawn file actions object (ADVANCED
int posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t *
file_actions, int fildes, int newfildes);
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() .
Upon successful completion, the posix_spawn_file_actions_adddup2() function shall return
zero; otherwise, an error number shall be returned to indicate the error.
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
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
The following sections are informative.
The posix_spawn_file_actions_adddup2() function is part of the Spawn option and need not
be provided on all implementations.
Refer to the RATIONALE in posix_spawn_file_actions_addclose() .
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>
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 orig-
inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 POSIX_SPAWN_FILE_ACTIONS_ADDDUP2(P)