posix_spawnattr_destroy(3p) — Linux manual page



PROLOG         top

       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         top

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

SYNOPSIS         top

       #include <spawn.h>

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

DESCRIPTION         top

       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. 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
       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         top

       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         top

       The posix_spawnattr_init() function shall fail if:

       ENOMEM Insufficient memory exists to initialize the spawn attributes

       The posix_spawnattr_destroy() function may fail if:

       EINVAL The value specified by attr is invalid.

       The following sections are informative.

EXAMPLES         top



       These functions are part of the Spawn option and need not be provided
       on all implementations.

RATIONALE         top

       The original spawn interface proposed in POSIX.1‐2008 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



SEE ALSO         top

       posix_spawn(3p), posix_spawnattr_getsigdefault(3p),
       posix_spawnattr_getflags(3p), posix_spawnattr_getpgroup(3p),
       posix_spawnattr_getschedpolicy(3p), posix_spawnattr_getsigmask(3p)

       The Base Definitions volume of POSIX.1‐2008, spawn.h(0p)

COPYRIGHT         top

       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 Electrical 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.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                 2013         POSIX_SPAWNATTR_DESTROY(3P)

Pages that refer to this page: spawn.h(0p)posix_spawn(3p)posix_spawnattr_getflags(3p)posix_spawnattr_getpgroup(3p)posix_spawnattr_getschedparam(3p)posix_spawnattr_getschedpolicy(3p)posix_spawnattr_getsigdefault(3p)posix_spawnattr_getsigmask(3p)posix_spawnattr_init(3p)