posix_spawn_file_actions_adddup2: přidat akci dup2 k objektu akcí s vytvářením souborů (POKROČILÝ REÁLNÝ ČAS)

Originální popis anglicky: posix_spawn_file_actions_adddup2 - add dup2 action to spawn file actions object ( ADVANCED REALTIME)

Návod, kniha: POSIX Programmer's Manual

STRUČNĚ

#include <spawn.h>

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() .

NÁVRATOVÁ HODNOTA

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

CHYBY / ERRORY

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.

PŘÍKLADY POUŽITÍ

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.

SOUVISEJÍCÍ

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 .

2003	IEEE/The Open Group