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POSIX_SPAWNATTR_DESTROY(P) POSIX_SPAWNATTR_DESTROY(P)
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 implementa-
tion. 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 imple-
mentations.
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 opera-
tion as a structure. In order to be able to separate optional individual attributes
under their appropriate options (that is, the spawn-schedparam and spawn-schedpol-
icy attributes depending upon the Process Scheduling option), and also for extensi-
bility 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_spaw-
nattr_getschedpolicy() , posix_spawnattr_getsigmask() , posix_spawnattr_setsigde-
fault() , posix_spawnattr_setflags() , posix_spawnattr_setpgroup() , posix_spaw-
nattr_setsigmask() , posix_spawnattr_setschedpolicy() , posix_spawnattr_setsched-
param() , 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 .
POSIX 2003 POSIX_SPAWNATTR_DESTROY(P)
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