c - Getting cpu_subtype_t in process that runs under i386 arch -

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i'm using c code generate coredump file out of mach-o based process.

however, i'm getting parsing corruption while loading lldb debugger after generating coredump 32bits process : 

(lldb) target create --core "/tmp/core_pid_1354" core file '/tmp/x/core.1354' (unknown-mach-32) loaded.

this, unknown 32 architecture issue, derived wrong cpu_subtype in struct mach_header.

in order cpu_type + cpu_subtype in following method : 

struct current_arch cpuarch = {0}; int mib[ctl_maxname]; size_t miblen; size_t cputypesize; pid_t pid = getpid(); miblen  = ctl_maxname; int err = sysctlnametomib("sysctl.proc_cputype", mib, &miblen); if (err) {     log_error("coultn't mib cpu type using sysctlnametomib. err = %d ", err);     return kern_failure; }  mib[miblen] = pid; miblen += 0x1; cputypesize = sizeof(cpuarch.type); err = sysctl(mib, (u_int)miblen, &(cpuarch.type), &cputypesize, 0x0, 0x0); if (err) {     log_error("coultn't cpu_type+cpu_subtype mib using syctl. err = %d ", err);     return kern_failure; }  *cpu_type = cpuarch.type; *cpu_subtype = cpuarch.subtype; return kern_success;

i've compiled core dumper tool under universal format (both 32/64 bits). , and when trying under arch=i386, cpu_subtype=0, non valid subtype i386. expect value of macro cpu_subtype_386 defined in machine.h file (=3):

#define cpu_subtype_intel(f, m) ((cpu_subtype_t) (f) + ((m) << 4)) #define cpu_subtype_386                 cpu_subtype_intel(3, 0)

any idea what's wrong in code getting cpu_subtype_t?


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