Version Dependency Section

This section is defined by the type SHT_SUNW_verneed. This section compliments the dynamic dependency requirements of the file by indicating the version definitions required from these dependencies. Only if a dependency contains version definitions will a recording be made in this section. Elements of this section have the following structure:

typedef struct {
        Elf32_Half      vn_version;
        Elf32_Half      vn_cnt;
        Elf32_Word      vn_file;
        Elf32_Word      vn_aux;
        Elf32_Word      vn_next;
} Elf32_Verneed;
 
typedef struct {
        Elf32_Word      vna_hash;
        Elf32_Half      vna_flags;
        Elf32_Half      vna_other;
        Elf32_Word      vna_name;
        Elf32_Word      vna_next;
} Elf32_Vernaux;

typedef struct {
        Elf64_Half      vn_version;
        Elf64_Half      vn_cnt;
        Elf64_Word      vn_file;
        Elf64_Word      vn_aux;
        Elf64_Word      vn_next;
} Elf64_Verneed;
 
typedef struct {
        Elf64_Word      vna_hash;
        Elf64_Half      vna_flags;
        Elf64_Half      vna_other;
        Elf64_Word      vna_name;
        Elf64_Word      vna_next;
} Elf64_Vernaux;

vn_version

This member identifies the version of the structure itself.

The value 1 signifies the original section format; extensions will create new versions with higher numbers. The value of VER_NEED_CURRENT changes as necessary to reflect the current version number.

vn_cnt

This member indicates the number of elements in the Elf32_Vernaux array.

vn_file

This member holds a string table offset to a null-terminated string, giving the filename having a version dependency. This name will match one of the .dynamic dependencies (refer to "Dynamic Section") found in the file.

vn_aux

This member holds the byte offset, from the start of this Elf32_Verneed entry, to the Elf32_Vernaux array of version definitions required from the associated file dependency. There must exist at least one version dependency. Additional version dependencies can be present, the number being indicated by the vn_cnt value.

vn_next

This member holds the byte offset, from the start of this Elf32_Verneed entry, to the next Elf32_Verneed entry.

vna_hash

This member holds the hash value of the version dependency name (this value is generated using the same hashing function described in "Hash Table").

vna_flags

This member holds version dependency specific information.

A weak version dependency indicates an original binding to a weak version definition. See "Creating a Version Definition" for more details.

vna_other

This member is presently unused.

vna_name

This member holds a string table offset to a null-terminated string, giving the name of the version dependency.

vna_next

This member holds the byte offset, from the start of this Elf32_Vernaux entry, to the next Elf32_Vernaux entry.