POSIX_SPAWNATTR_SETBINPREF_NP(3)			   BSD Library Functions Manual 			  POSIX_SPAWNATTR_SETBINPREF_NP(3)

NAME

     posix_spawnattr_setbinpref_np posix_spawnattr_getbinpref_np -- set or get the spawn-binpref attribute on a posix_spawnattr_t

SYNOPSIS

     #include <spawn.h>

     int
     posix_spawnattr_setbinpref_np(posix_spawnattr_t *restrict attr, size_t count, cpu_type_t *pref, size_t *restrict ocount);

     int
     posix_spawnattr_getbinpref_np(const posix_spawnattr_t *restrict attr, size_t count, cpu_type_t *pref, size_t * restrict ocount);

IMPORTANT

     These functions represent an Apple extension to posix_spawn(2) and posix_spawnp(2), and as such should not be used by programs intending
     their code to be portable to other platforms.

DESCRIPTION

     The posix_spawnattr_setbinpref_np() function sets the universal binary preferences for the spawn attribute value referenced by attr from the
     memory containing the cpu_type_t referenced by pref with a size of count elements; the actual number of elements that are set in the
     attribute is returned in ocount.

     When spawn(2) or spawnp(2) is subsequently invoked on a Universal binary with the posix_spawnattr_t, the elements which were set will be
     used, in the order they were set, to select the first element in the list which matches any cpu_type_t of those available in the Universal
     binary.  If there is no match, then the attempt to create the child process will fail with the error EBADARCH.  If the cpu_type_t
     CPU_TYPE_ANY is the last element in the list, then rather than returning EBADARCH on no match, the system will instead fall back to the stan-
     dard Universal binary grading preference order.

     The posix_spawnattr_getbinpref_np() function gets the universal binary preferences for the spawn attribute value referenced by attr into the
     memory containing the cpu_type_t referenced by pref with a prereserved size of count elements; the actual number of elements that are copied
     from the attribute is returned in ocount.

RETURN VALUES

     On success, these functions return 0; on failure they return an error number from <errno.h> and modify the value of ocount.  Additionally, if
     successful, posix_spawnattr_getbinpref_np() will modify the contents of the pref array with the current attribute values.

ERRORS

     These functions may fail if:

     [EINVAL]		The value specified by attr is invalid.

     [EINVAL]		The value of attr is invalid.

SEE ALSO

     posix_spawn(2), posix_spawnp(2), posix_spawnattr_init(3), posix_spawnattr_destroy(3), posix_spawnattr_setflags(3)

STANDARDS

     Nonstandard

HISTORY

     The posix_spawnattr_setbinpref_np() and posix_spawnattr_getbinpref_np() function calls appeared in Mac OS X.

Mac OS X							  August 22, 2007							  Mac OS X