Version Dependency Section
The version dependency section is defined by the type
SHT_SUNW_verneed
. This section complements the dynamic dependency
requirements of the file by indicating the version definitions required from these
dependencies. A recording is made in this section only if a dependency contains version
definitions. 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, as listed in the following table.
Name Value Meaning VER_NEED_NONE
0
Invalid version.
VER_NEED_CURRENT
>=1
Current version.
The value 1 signifies the original section format. Extensions require new versions with higher numbers. The value of
VER_NEED_CURRENT
changes as necessary to reflect the current version number. -
vn_cnt
-
The number of elements in the
Elf32_Vernaux
array. -
vn_file
-
The string table offset to a null-terminated string, providing the file name of a version dependency. This name matches one of the
.dynamic
dependencies found in the file. See Dynamic Section. -
vn_aux
-
The byte offset, from the start of this
Elf32_Verneed
entry, to theElf32_Vernaux
array of version definitions that are required from the associated file dependency. At least one version dependency must exist. Additional version dependencies can be present, the number being indicated by thevn_cnt
value. -
vn_next
-
The byte offset, from the start of this
Elf32_Verneed
entry, to the nextElf32_Verneed
entry. -
vna_hash
-
The hash value of the version dependency name. This value is generated using the same hashing function that is described in Hash Table Section.
-
vna_flags
-
Version dependency specific information, as listed in the following table.
Name Value Meaning VER_FLG_WEAK
0x2
Weak version identifier.
VER_FLG_INFO
0x4
SHT_SUNW_versym
reference exists for informational purposes, and need not be validated at runtime.A weak version dependency indicates an original binding to a weak version definition.
-
vna_other
-
If non-zero, the version index assigned to this dependency version. This index is used within the
SHT_SUNW_versym
to assign global symbol references to this version.Versions of Solaris up to and including the Oracle Solaris 10 release, did not assign version symbol indexes to dependency versions. In these objects, the value of
vna_other
is0
. -
vna_name
-
The string table offset to a null-terminated string, giving the name of the version dependency.
-
vna_next
-
The byte offset from the start of this
Elf32_Vernaux
entry to the nextElf32_Vernaux
entry.