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com.sun.security.auth.module

public Class UnixSystem

extends Object
Class Inheritance
Annotations
@SuppressWarnings:restricted
Imports
jdk.internal.util.Architecture, .OperatingSystem, java.lang.foreign.AddressLayout, .Arena, .FunctionDescriptor, .GroupLayout, .Linker, .MemoryLayout, .MemorySegment, .StructLayout, .SymbolLookup, .ValueLayout, java.lang.invoke.MethodHandle, .VarHandle
This class implementation retrieves and makes available Unix UID/GID/groups information for the current user.
Since
1.4

Field Summary

Modifier and TypeField and Description
private static final ValueLayout.OfByte
C_CHAR

private static final ValueLayout.OfInt
C_INT

private static final ValueLayout.OfLong
C_LONG

private static final AddressLayout
C_POINTER

private static final ValueLayout
C_SIZE_T

private static final boolean
calling_convention_requires_int_as_long

private static final StructLayout
CAPTURE_STATE_LAYOUT

private static final int
GETPW_R_SIZE_MAX

protected long
gid

The current group ID.

protected long[]
groups

The current list of groups.

private static final Linker
LINKER

private static final MethodHandle
MH_getgroups

private static final MethodHandle
MH_getpwuid_r

private static final MethodHandle
MH_getuid

private static final MethodHandle
MH_strerror

private static final GroupLayout
ML_passwd

private static final SymbolLookup
SYMBOL_LOOKUP

protected long
uid

The current user ID.

protected String
username

The current username.

private static final VarHandle
VH_errno

private static final VarHandle
VH_pw_gid

private static final VarHandle
VH_pw_name

private static final VarHandle
VH_pw_uid

Constructor Summary

AccessConstructor and Description
public
UnixSystem()

Instantiate a UnixSystem and load the native library to access the underlying system information.

Method Summary

Modifier and TypeMethod and Description
public long

Returns:

the GID for the current Unix user.
getGid()

Get the GID for the current Unix user.

public long[]

Returns:

the supplementary groups for the current Unix user.
getGroups()

Get the supplementary groups for the current Unix user.

public long

Returns:

the UID for the current Unix user.
getUid()

Get the UID for the current Unix user.

public String

Returns:

the username for the current Unix user.
getUsername()

Get the username for the current Unix user.

Inherited from java.lang.Object:
cloneequalsfinalizegetClasshashCodenotifynotifyAlltoStringwaitwaitwait

Field Detail

C_CHARback to summary
private static final ValueLayout.OfByte C_CHAR
C_INTback to summary
private static final ValueLayout.OfInt C_INT
C_LONGback to summary
private static final ValueLayout.OfLong C_LONG
C_POINTERback to summary
private static final AddressLayout C_POINTER
C_SIZE_Tback to summary
private static final ValueLayout C_SIZE_T
calling_convention_requires_int_as_longback to summary
private static final boolean calling_convention_requires_int_as_long
CAPTURE_STATE_LAYOUTback to summary
private static final StructLayout CAPTURE_STATE_LAYOUT
GETPW_R_SIZE_MAXback to summary
private static final int GETPW_R_SIZE_MAX
gidback to summary
protected long gid

The current group ID.

groupsback to summary
protected long[] groups

The current list of groups.

LINKERback to summary
private static final Linker LINKER
MH_getgroupsback to summary
private static final MethodHandle MH_getgroups
MH_getpwuid_rback to summary
private static final MethodHandle MH_getpwuid_r
MH_getuidback to summary
private static final MethodHandle MH_getuid
MH_strerrorback to summary
private static final MethodHandle MH_strerror
ML_passwdback to summary
private static final GroupLayout ML_passwd
SYMBOL_LOOKUPback to summary
private static final SymbolLookup SYMBOL_LOOKUP
uidback to summary
protected long uid

The current user ID.

usernameback to summary
protected String username

The current username.

VH_errnoback to summary
private static final VarHandle VH_errno
VH_pw_gidback to summary
private static final VarHandle VH_pw_gid
VH_pw_nameback to summary
private static final VarHandle VH_pw_name
VH_pw_uidback to summary
private static final VarHandle VH_pw_uid

Constructor Detail

UnixSystemback to summary
public UnixSystem()

Instantiate a UnixSystem and load the native library to access the underlying system information.

Method Detail

getGidback to summary
public long getGid()

Get the GID for the current Unix user.

Returns:long

the GID for the current Unix user.

getGroupsback to summary
public long[] getGroups()

Get the supplementary groups for the current Unix user.

Returns:long[]

the supplementary groups for the current Unix user.

getUidback to summary
public long getUid()

Get the UID for the current Unix user.

Returns:long

the UID for the current Unix user.

getUsernameback to summary
public String getUsername()

Get the username for the current Unix user.

Returns:String

the username for the current Unix user.