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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "POSIX_SPAWN_FILE_ACTIONS_ADDDUP2" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" posix_spawn_file_actions_adddup2 
+.SH NAME
+posix_spawn_file_actions_adddup2 \- add dup2 action to spawn file actions
+object (\fBADVANCED REALTIME\fP)
+.SH SYNOPSIS
+.LP
+\fB#include <spawn.h>
+.br
+.sp
+int posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t *
+.br
+\ \ \ \ \ \ \fP \fIfile_actions\fP\fB, int\fP \fIfildes\fP\fB, int\fP
+\fInewfildes\fP\fB);
+\fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fIposix_spawn_file_actions_adddup2\fP() function shall add a
+\fIdup2\fP() action to
+the object referenced by \fIfile_actions\fP that shall cause the file
+descriptor \fIfildes\fP to be duplicated as
+\fInewfildes\fP (as if \fIdup2\fP( \fIfildes\fP, \fInewfildes\fP)
+had been called) when a new process is spawned using this
+file actions object.
+.LP
+A spawn file actions object is as defined in \fIposix_spawn_file_actions_addclose\fP()
+\&.
+.SH RETURN VALUE
+.LP
+Upon successful completion, the \fIposix_spawn_file_actions_adddup2\fP()
+function shall return zero; otherwise, an error number
+shall be returned to indicate the error.
+.SH ERRORS
+.LP
+The \fIposix_spawn_file_actions_adddup2\fP() function shall fail if:
+.TP 7
+.B EBADF
+The value specified by \fIfildes\fP or \fInewfildes\fP is negative
+or greater than or equal to {OPEN_MAX}.
+.TP 7
+.B ENOMEM
+Insufficient memory exists to add to the spawn file actions object.
+.sp
+.LP
+The \fIposix_spawn_file_actions_adddup2\fP() function may fail if:
+.TP 7
+.B EINVAL
+The value specified by \fIfile_actions\fP is invalid.
+.sp
+.LP
+It shall not be considered an error for the \fIfildes\fP argument
+passed to the \fIposix_spawn_file_actions_adddup2\fP()
+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 \fIposix_spawn\fP() or \fIposix_spawnp\fP()
+operation.
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+The \fIposix_spawn_file_actions_adddup2\fP() function is part of the
+Spawn option and need not be provided on all
+implementations.
+.SH RATIONALE
+.LP
+Refer to the RATIONALE in \fIposix_spawn_file_actions_addclose\fP()
+\&.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIdup\fP() , \fIposix_spawn\fP() , \fIposix_spawn_file_actions_addclose\fP()
+, \fIposix_spawn_file_actions_destroy\fP() , \fIposix_spawnp\fP()
+, the Base Definitions volume of IEEE\ Std\ 1003.1-2001, \fI<spawn.h>\fP
+.SH 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 .