Get binary type on Mac.

binary_type.cpp

#include <mach-o/loader.h>
#include <cstdio>

void print_filetype(const uint32_t filetype)
{
    const char *msg;
    switch(filetype) {
        case MH_OBJECT:
            msg = "MH_OBJECT";
            break;
        case MH_EXECUTE:
            msg = "MH_EXECUTE";
            break;
        case MH_FVMLIB:
            msg = "MF_FVMLIB";
            break;
        case MH_CORE:
            msg = "MH_CORE";
            break;
        case MH_PRELOAD:
            msg = "MH_PRELOAD";
            break;
        case MH_DYLIB:
            msg = "MH_DYLIB";
            break;
        case MH_DYLINKER:
            msg = "MH_DYLINKER";
            break;
        case MH_BUNDLE:
            msg = "MH_BUNDLE";
            break;
        case MH_DYLIB_STUB:
            msg = "MH_DYLIB_STUB";
            break;
        default:
            msg = "Unknown";
            break;
    };
    std::printf("%s", msg);
}

int main(void)
{
    const char *filename = "./a.out";
    struct mach_header_64 mh64;
    std::FILE *fp = std::fopen(filename, "r");
    std::fread(&mh64, sizeof(mach_header_64), 1, fp);

    if (mh64.magic == MH_MAGIC_64) {
        std::printf("MH_MAGIC_64\n");
    } else if (mh64.magic == MH_CIGAM_64) {
        std::printf("MH_CIGAM_64\n");
    } else {
        std::printf("Unknown\n");
    }
    print_filetype(mh64.filetype);
    std::fclose(fp);
    return 0;
}