posix_spawnattr_getbinpref_np(3) - Useful Manual Pages

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.

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, using the best slice matching that cpu_type_t. 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 standard Universal binary grading preference order. If called multiple times on the same attr, the previous preferences will be overwritten.

The posix_spawnattr_getbinpref_np() function gets the universal binary preferences for the spawn attribute value referenced by attr (set by a prior call to posix_spawnattr_setbinpref_np() or posix_spawnattr_setarchpref_np()) 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.