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ARCH(3) BSD Library Functions Manual ARCH(3)
NAME
NXGetAllArchInfos, NXGetLocalArchInfo, NXGetArchInfoFromName, NXGetArchInfoFromCpuType, NXFindBestFatArch, NXCombineCpuSubtypes -- get archi-
tecture information
SYNOPSIS
#include <mach-o/arch.h>
extern const NXArchInfo *
NXGetAllArchInfos(void);
extern const NXArchInfo *
NXGetLocalArchInfo(void);
extern const NXArchInfo *
NXGetArchInfoFromName(const char *name);
extern const NXArchInfo *
NXGetArchInfoFromCpuType(cpu_type_t cputype, cpu_subtype_t cpusubtype);
extern struct fat_arch *
NXFindBestFatArch(cpu_type_t cputype, cpu_subtype_t cpusubtype, struct fat_arch *fat_archs, unsigned long nfat_archs);
extern cpu_subtype_t
NXCombineCpuSubtypes(cpu_type_t cputype, cpu_subtype_t cpusubtype1, cpu_subtype_t cpusubtype2);
DESCRIPTION
These functions are intended for use in programs that have to deal with universal files or programs that can target multiple architectures.
Typically, a program will use a command-line argument that starts with ``-arch name'', where this specifies an architecture. These functions
and data structures provide some help for processing architecture flags and then processing the contents of a universal file.
The structure NXArchInfo is defined in <mach-o/arch.h>:
typedef struct {
const char *name;
cpu_type_t cputype;
cpu_subtype_t cpusubtype;
enum NXByteOrder byteorder;
const char *description;
} NXArchInfo;
It is used to hold the name of the architecture and the corresponding CPU type and CPU subtype, together with the architecture's byte order
and a brief description string.
The currently known architectures are:
Name CPU Type CPU Subtype Description
ppc CPU_TYPE_POWERPC CPU_SUBTYPE_POWERPC_ALL PowerPC
ppc64 CPU_TYPE_POWERPC64 CPU_SUBTYPE_POWERPC64_ALL PowerPC 64-bit
i386 CPU_TYPE_I386 CPU_SUBTYPE_I386_ALL Intel 80x86
x86_64 CPU_TYPE_X86_64 CPU_SUBTYPE_X86_64_ALL Intel x86-64
m68k CPU_TYPE_MC680x0 CPU_SUBTYPE_MC680x0_ALL Motorola 68K
hppa CPU_TYPE_HPPA CPU_SUBTYPE_HPPA_ALL HP-PA
i860 CPU_TYPE_I860 CPU_SUBTYPE_I860_ALL Intel 860
m88k CPU_TYPE_MC88000 CPU_SUBTYPE_MC88000_ALL Motorola 88K
sparc CPU_TYPE_SPARC CPU_SUBTYPE_SPARC_ALL SPARC
ppc601 CPU_TYPE_POWERPC CPU_SUBTYPE_POWERPC_601 PowerPC 601
ppc603 CPU_TYPE_POWERPC CPU_SUBTYPE_POWERPC_603 PowerPC 603
ppc604 CPU_TYPE_POWERPC CPU_SUBTYPE_POWERPC_604 PowerPC 604
ppc604e CPU_TYPE_POWERPC CPU_SUBTYPE_POWERPC_604e PowerPC 604e
ppc750 CPU_TYPE_POWERPC CPU_SUBTYPE_POWERPC_750 PowerPC 750
ppc7400 CPU_TYPE_POWERPC CPU_SUBTYPE_POWERPC_7400 PowerPC 7400
ppc7450 CPU_TYPE_POWERPC CPU_SUBTYPE_POWERPC_7450 PowerPC 7450
ppc970 CPU_TYPE_POWERPC CPU_SUBTYPE_POWERPC_970 PowerPC 970
i486 CPU_TYPE_I386 CPU_SUBTYPE_486 Intel 486
i486SX CPU_TYPE_I386 CPU_SUBTYPE_486SX Intel 486SX
pentium CPU_TYPE_I386 CPU_SUBTYPE_PENT Intel Pentium
i586 CPU_TYPE_I386 CPU_SUBTYPE_586 Intel 586
pentpro CPU_TYPE_I386 CPU_SUBTYPE_PENTPRO Intel Pentium Pro
i686 CPU_TYPE_I386 CPU_SUBTYPE_PENTPRO Intel Pentium Pro
pentIIm3 CPU_TYPE_I386 CPU_SUBTYPE_PENTII_M3 Intel Pentium II Model 3
pentIIm5 CPU_TYPE_I386 CPU_SUBTYPE_PENTII_M5 Intel Pentium II Model 5
pentium4 CPU_TYPE_I386 CPU_SUBTYPE_PENTIUM_4 Intel Pentium 4
m68030 CPU_TYPE_MC680x0 CPU_SUBTYPE_MC68030_ONLY Motorola 68030
m68040 CPU_TYPE_MC680x0 CPU_SUBTYPE_MC68040 Motorola 68040
hppa7100LC CPU_TYPE_HPPA CPU_SUBTYPE_HPPA_7100LC HP-PA 7100LC
The first set of entries are used for the architecture family. The second set of entries are used for a specific architecture, when more
than one specific architecture is supported in a family of architectures.
NXGetAllArchInfos() returns a pointer to an array of all known NXArchInfo structures. The last NXArchInfo is marked by a NULL name.
NXGetLocalArchInfo() returns the NXArchInfo for the local host, or NULL if none is known.
NXGetArchInfoFromName() and NXGetArchInfoFromCpuType() return the NXArchInfo from the architecture's name or CPU type/CPU subtype combina-
tion. A CPU subtype of CPU_SUBTYPE_MULTIPLE can be used to request the most general NXArchInfo known for the given CPU type. NULL is
returned if no matching NXArchInfo can be found.
NXFindBestFatArch() is passed a CPU type and CPU subtype and a set of fat_arch structs. It selects the best one that matches (if any), and
returns a pointer to that fat_arch struct (or NULL). The fat_arch structs must be in the host byte order and correct such that fat_archs
really points to enough memory for nfat_archs structs. It is possible that this routine could fail if new CPU types or CPU subtypes are
added and an old version of this routine is used. But if there is an exact match between the CPU type and CPU subtype and one of the
fat_arch structs, this routine will always succeed.
NXCombineCpuSubtypes() returns the resulting CPU subtype when combining two different CPU subtypes for the specified CPU type. If the two
CPU subtypes can't be combined (the specific subtypes are mutually exclusive), -1 is returned, indicating it is an error to combine them.
This can also fail and return -1 if new CPU types or CPU subtypes are added and an old version of this routine is used. But if the CPU sub-
types are the same, they can always be combined and this routine will return the CPU subtype passed in.
SEE ALSO
arch(1)
July 28, 2005