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POSIX_SPAWNATTR_DESTROY
Section: POSIX Programmer's Manual (3P)
Updated: 2003
Index
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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_spawnattr_init() is called
specifying an already initialized attr attributes 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. IEEE Std 1003.1-2001 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
IEEE Std 1003.1-2001. Attributes not defined by IEEE Std 1003.1-2001,
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
individual 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_spawnattr_init()
shall return zero; otherwise, an
error number shall be returned 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 IEEE Std 1003.1-2001 defined
the attributes that specify the inheritance of
process attributes across a spawn operation as a structure. In order
to be able to separate optional 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 consistency 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, together with associated functions to initialize or destroy
the attributes 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_getflags(),
posix_spawnattr_getpgroup(), posix_spawnattr_getschedparam(),
posix_spawnattr_getschedpolicy(), posix_spawnattr_getsigmask(),
posix_spawnattr_setsigdefault(), posix_spawnattr_setflags(),
posix_spawnattr_setpgroup(), posix_spawnattr_setsigmask(),
posix_spawnattr_setschedpolicy(), posix_spawnattr_setschedparam(),
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 .
Index
- PROLOG
-
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- EXAMPLES
-
- APPLICATION USAGE
-
- RATIONALE
-
- FUTURE DIRECTIONS
-
- SEE ALSO
-
- COPYRIGHT
-
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