Linux文件命令：SYSV意味着什么？

Table 5. Operating System and ABI Identifiers,e_ident[EI_OSABI]
Name                 Value   meaning
ELFOSABI_SYSV          0     System V ABI
ELFOSABI_HPUX          1     HP-UX operating system
ELFOSABI_STANDALONE   255    Standalone (embedded) application

我的本地计算机的/usr/share / file / magic / elf文件有一个更长的列表：

# Up to Now only 0,1 and 2 are defined; I've seen a file with 0x83,it seemed
# like proper ELF,but extracTing the String had bad results.
>4      byte            <0x80
>>8 String      >\0     (%s)
>8  String      \0
>>7 byte        0       (SYSV)
>>7 byte        1       (HP-UX)
>>7 byte        2       (NetBSD)
>>7 byte        3       (GNU/LinuX)
>>7 byte        4       (GNU/Hurd)
>>7 byte        5       (86Open)
>>7 byte        6       (Solaris)
>>7 byte        7       (Monterey)
>>7 byte        8       (IRIX)
>>7 byte        9       (FreeBSD)
>>7 byte        10      (Tru64)
>>7 byte        11      (Novell Modesto)
>>7 byte        12      (OpenBSD)
>8      String          \2
>>7     byte            13              (OpenVMS)
>>7 byte        97      (ARM)
>>7 byte        255     (embedded)

以下是您参考的ELF标题和偏移量(从this link开始)：

#define EI_NIDENT 16

typedef struct {
        unsigned char   e_ident[EI_NIDENT];
        Elf32_Half      e_type;
        Elf32_Half      e_machine;
        Elf32_Word      e_version;
        Elf32_Addr      e_entry;
        Elf32_Off       e_phoff;
        Elf32_Off       e_shoff;
        Elf32_Word      e_flags;
        Elf32_Half      e_ehsize;
        Elf32_Half      e_phentsize;
        Elf32_Half      e_phnum;
        Elf32_Half      e_shentsize;
        Elf32_Half      e_shnum;
        Elf32_Half      e_shstrndx;
} Elf32_Ehdr;


figure 4-4: e_ident[] Identification Indexes
Name      Value Purpose
EI_MAG0       0     File identification
EI_MAG1       1     File identification
EI_MAG2       2     File identification
EI_MAG3       3     File identification
EI_CLASS      4     File class
EI_DATA       5     Data encoding
EI_VERSION    6     File version
EI_OSABI      7     Operating system/ABI identification
EI_ABIVERSION 8     ABI version
EI_PAD        9     Start of padding bytes
EI_NIDENT     16    Size of e_ident[]