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.\"
.ds xT X Toolkit Intrinsics \- C Language Interface
.ds xW Athena X Widgets \- C Language X Toolkit Interface
.ds xL Xlib \- C Language X Interface
.ds xC Inter-Client Communication Conventions Manual
.na
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.ny0
.TH XInternAtom 3 "libX11 1.6.4" "X Version 11" "XLIB FUNCTIONS"
.SH NAME
XInternAtom, XInternAtoms, XGetAtomName, XGetAtomNames \- create or return atom names
.SH SYNTAX
.HP
Atom XInternAtom\^(\^Display *\fIdisplay\fP\^, char *\fIatom_name\fP\^, Bool
\fIonly_if_exists\fP\^); 
.HP
Status XInternAtoms\^(\^Display *\fIdisplay\fP\^, char **\fInames\fP\^, int
\fIcount\fP\^, Bool \fIonly_if_exists\fP\^, Atom *\fIatoms_return\fP\^); 
.HP
char *XGetAtomName\^(\^Display *\fIdisplay\fP\^, Atom \fIatom\fP\^); 
.HP
Status XGetAtomNames\^(\^Display *\fIdisplay\fP\^, Atom *\fIatoms\fP\^, int
\fIcount\fP\^, char **\fInames_return\fP\^); 
.SH ARGUMENTS
.IP \fIatom\fP 1i
Specifies the atom for the property name you want returned.
.IP \fIatoms\fP 1i
Specifies the array of atoms.
.IP \fIatom_name\fP 1i
Specifies the name associated with the atom you want returned.
.IP \fIatoms_return\fP 1i
Returns the atoms.
.ds Cn atom names in the array
.IP \fIcount\fP 1i
Specifies the number of \*(Cn.
.ds Cn atoms in the array
.IP \fIcount\fP 1i
Specifies the number of \*(Cn.
.IP \fIdisplay\fP 1i
Specifies the connection to the X server.
.IP \fInames\fP 1i
Specifies the array of atom names.
.IP \fInames_return\fP 1i
Returns the atom names.
.IP \fIonly_if_exists\fP 1i
Specifies a Boolean value that indicates whether the atom must be created.
.SH DESCRIPTION
The
.ZN XInternAtom
function returns the atom identifier associated with the specified atom_name
string.
If only_if_exists is 
.ZN False ,
the atom is created if it does not exist.
Therefore,
.ZN XInternAtom
can return
.ZN None .
If the atom name is not in the Host Portable Character Encoding, 
the result is implementation-dependent.
Uppercase and lowercase matter;
the strings ``thing'', ``Thing'', and ``thinG'' 
all designate different atoms.  
The atom will remain defined even after the client's connection closes.
It will become undefined only when the last connection to
the X server closes.
.LP
.ZN XInternAtom
can generate
.ZN BadAlloc 
and
.ZN BadValue 
errors.
.LP
The
.ZN XInternAtoms
function returns the atom identifiers associated with the specified names.
The atoms are stored in the atoms_return array supplied by the caller.
Calling this function is equivalent to calling
.ZN XInternAtom
for each of the names in turn with the specified value of only_if_exists,
but this function minimizes the number of round-trip protocol exchanges
between the client and the X server.
.LP
This function returns a nonzero status if atoms are returned for
all of the names;
otherwise, it returns zero.
.LP
.ZN XInternAtoms
can generate
.ZN BadAlloc 
and
.ZN BadValue 
errors.
.LP
The
.ZN XGetAtomName
function returns the name associated with the specified atom.
If the data returned by the server is in the Latin Portable Character Encoding,
then the returned string is in the Host Portable Character Encoding.
Otherwise, the result is implementation-dependent.
To free the resulting string,
call
.ZN XFree .
.LP
.ZN XGetAtomName
can generate a
.ZN BadAtom 
error.
.LP
The
.ZN XGetAtomNames
function returns the names associated with the specified atoms.
The names are stored in the names_return array supplied by the caller.
Calling this function is equivalent to calling
.ZN XGetAtomName
for each of the atoms in turn,
but this function minimizes the number of round-trip protocol exchanges
between the client and the X server.
.LP
This function returns a nonzero status if names are returned for
all of the atoms;
otherwise, it returns zero.
.LP
.ZN XGetAtomNames
can generate a
.ZN BadAtom 
error.
.SH DIAGNOSTICS
.TP 1i
.ZN BadAlloc
The server failed to allocate the requested resource or server memory.
.TP 1i
.ZN BadAtom
A value for an Atom argument does not name a defined Atom.
.TP 1i
.ZN BadValue
Some numeric value falls outside the range of values accepted by the request.
Unless a specific range is specified for an argument, the full range defined
by the argument's type is accepted.  Any argument defined as a set of
alternatives can generate this error.
.SH "SEE ALSO"
XFree(3),
XGetWindowProperty(3)
.br
\fI\*(xL\fP
