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+.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
+.\"
+.\" This is free documentation; you can redistribute it and/or
+.\" modify it under the terms of the GNU General Public License as
+.\" published by the Free Software Foundation; either version 2 of
+.\" the License, or (at your option) any later version.
+.\"
+.\" References consulted:
+.\"   GNU glibc-2 source code and manual
+.\"   GNU gettext source code and manual
+.\"   LI18NUX 2000 Globalization Specification
+.\"
+.TH TEXTDOMAIN 3 "May 2001" "GNU gettext 0.22"
+.SH NAME
+textdomain \- set domain for future gettext() calls
+.SH SYNOPSIS
+.nf
+.B #include <libintl.h>
+.sp
+.BI "char * textdomain (const char * " domainname );
+.fi
+.SH DESCRIPTION
+The \fBtextdomain\fP function sets or retrieves the current message domain.
+.PP
+A message domain is a set of translatable \fImsgid\fP messages. Usually,
+every software package has its own message domain. The domain name is used
+to determine the message catalog where a translation is looked up; it must
+be a non-empty string.
+.PP
+The current message domain is used by the \fBgettext\fP, \fBngettext\fP
+functions, and by the \fBdgettext\fP, \fBdcgettext\fP, \fBdngettext\fP and
+\fBdcngettext\fP functions when called with a NULL domainname argument.
+.PP
+If \fIdomainname\fP is not NULL, the current message domain is set to
+\fIdomainname\fP. The string the function stores internally is a copy of the
+\fIdomainname\fP argument.
+.PP
+If \fIdomainname\fP is NULL, the function returns the current message domain.
+.SH "RETURN VALUE"
+If successful, the \fBtextdomain\fP function returns the current message
+domain, after possibly changing it. The resulting string is valid until the
+next \fBtextdomain\fP call and must not be modified or freed. If a memory
+allocation failure occurs, it sets \fBerrno\fP to \fBENOMEM\fP and returns
+NULL.
+.SH ERRORS
+The following error can occur, among others:
+.TP
+.B ENOMEM
+Not enough memory available.
+.SH BUGS
+The return type ought to be \fBconst char *\fP, but is \fBchar *\fP to avoid
+warnings in C code predating ANSI C.
+.SH "SEE ALSO"
+.BR gettext (3),
+.BR ngettext (3),
+.BR bindtextdomain (3),
+.BR bind_textdomain_codeset (3)