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Linux 2.6 - man page for posix_spawnattr_init (linux section 3posix)


       posix_spawnattr_destroy,  posix_spawnattr_init  -  destroy and initialize spawn attributes
       object (ADVANCED REALTIME)

       #include <spawn.h>

       int posix_spawnattr_destroy(posix_spawnattr_t *attr);
       int posix_spawnattr_init(posix_spawnattr_t *attr);

       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

       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.

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

       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.


       These functions are part of the Spawn option and need not be provided on  all  implementa-

       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.


       posix_spawn() , posix_spawnattr_getsigdefault() , posix_spawnattr_getflags() , posix_spaw-
       nattr_getpgroup() , posix_spawnattr_getschedparam() ,  posix_spawnattr_getschedpolicy()	,
       posix_spawnattr_getsigmask()   ,  posix_spawnattr_setsigdefault()  ,  posix_spawnattr_set-
       flags()	,  posix_spawnattr_setpgroup()	,  posix_spawnattr_setsigmask()   ,   posix_spaw-
       nattr_setschedpolicy() , posix_spawnattr_setschedparam() , posix_spawnp() , the Base Defi-
       nitions volume of IEEE Std 1003.1-2001, <spawn.h>

       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 orig-
       inal Standard can be obtained online at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group			       2003		       POSIX_SPAWNATTR_DESTROY(P)

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