x SuSE Linux 13.1-RELEASE x
x SuSE Linux 13.1-RELEASEx
POSIX_SPAWNATTR_DESTROY(3P)POSIX Programmer's ManuaPOSIX_SPAWNATTR_DESTROY(3P)
PROLOG
This manual page is part of the POSIX Programmer's Manual. The Linux
implementation of this interface may differ (consult the corresponding
Linux manual page for details of Linux behavior), or the interface may
not be implemented on Linux.
NAME
posix_spawnattr_destroy, posix_spawnattr_init -- destroy and initialize
spawn attributes object (ADVANCED REALTIME)
SYNOPSIS
#include <spawn.h>
int posix_spawnattr_destroy(posix_spawnattr_t *attr);
int posix_spawnattr_init(posix_spawnattr_t *attr);
DESCRIPTION
The posix_spawnattr_destroy() function shall destroy a spawn attributes
object. A destroyed attr attributes object can be reinitialized using
posix_spawnattr_init(); the results of otherwise referencing the object
after it has been destroyed are undefined. An implementation may cause
posix_spawnattr_destroy() to set the object referenced by attr to an
invalid value.
The posix_spawnattr_init() function shall initialize a spawn attributes
object attr with the default value for all of the individual attributes
used by the implementation. Results are undefined if posix_spaw-
nattr_init() is called specifying an already initialized attr at-
tributes object.
A spawn attributes object is of type posix_spawnattr_t (defined in
<spawn.h>) and is used to specify the inheritance of process attributes
across a spawn operation. POSIX.1-2008 does not define comparison or
assignment operators for the type posix_spawnattr_t.
Each implementation shall document the individual attributes it uses
and their default values unless these values are defined by
POSIX.1-2008. Attributes not defined by POSIX.1-2008, their default
values, and the names of the associated functions to get and set those
attribute values are implementation-defined.
The resulting spawn attributes object (possibly modified by setting in-
dividual attribute values), is used to modify the behavior of
posix_spawn() or posix_spawnp(). After a spawn attributes object has
been used to spawn a process by a call to a posix_spawn() or
posix_spawnp(), any function affecting the attributes object (including
destruction) shall not affect any process that has been spawned in this
way.
RETURN VALUE
Upon successful completion, posix_spawnattr_destroy() and posix_spaw-
nattr_init() shall return zero; otherwise, an error number shall be re-
turned to indicate the error.
ERRORS
The posix_spawnattr_init() function shall fail if:
ENOMEM Insufficient memory exists to initialize the spawn attributes
object.
The posix_spawnattr_destroy() function may fail if:
EINVAL The value specified by attr is invalid.
The following sections are informative.
EXAMPLES
None.
APPLICATION USAGE
These functions are part of the Spawn option and need not be provided
on all implementations.
RATIONALE
The original spawn interface proposed in POSIX.1-2008 defined the at-
tributes that specify the inheritance of process attributes across a
spawn operation as a structure. In order to be able to separate op-
tional individual attributes under their appropriate options (that is,
the spawn-schedparam and spawn-schedpolicy attributes depending upon
the Process Scheduling option), and also for extensibility and consis-
tency with the newer POSIX interfaces, the attributes interface has
been changed to an opaque data type. This interface now consists of the
type posix_spawnattr_t, representing a spawn attributes object, to-
gether with associated functions to initialize or destroy the at-
tributes object, and to set or get each individual attribute. Although
the new object-oriented interface is more verbose than the original
structure, it is simple to use, more extensible, and easy to implement.
FUTURE DIRECTIONS
None.
SEE ALSO
posix_spawn(), posix_spawnattr_getsigdefault(), posix_spawnattr_get-
flags(), posix_spawnattr_getpgroup(), posix_spawnattr_getschedparam(),
posix_spawnattr_getschedpolicy(), posix_spawnattr_getsigmask()
The Base Definitions volume of POSIX.1-2008, <spawn.h>
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri-
cal and Electronics Engineers, Inc and The Open Group. (This is
POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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.unix.org/online.html .
Any typographical or formatting errors that appear in this page are
most likely to have been introduced during the conversion of the source
files to man page format. To report such errors, see https://www.ker-
nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2013 POSIX_SPAWNATTR_DESTROY(3P)
Want to link to this manual page? Use this URL:
<http://star2.abcm.com/cgi-bin/bsdi-man?query=posix_spawnattr_destroy&sektion=3&manpath=>