Open System Services Porting Guide (G06.29+, H06.06+, J06.03+)

localeconv(3) reference pages either online or in the Open System Services Library Calls
Reference Manual.
Locales in OSS Client/Server Applications
For homogeneous client/server applications in the OSS environment, Open System Services
provides the setlocale_from_msg() function to enable a server to receive a client’s locale
information, along with messages from $RECEIVE.
If a client that is not internationalized communicates with an internationalized server, the only
locale available is the C/POSIX default locale. If an internationalized client communicates with a
server that is not internationalized, the result is undefined.
To change a server’s locale to match the locale associated with a client’s message, the server must
specify that it is to receive locale information, with the following steps:
• Use FILE_OPEN_ option <13> (locale support) when opening $RECEIVE. This option specifies
that data messages are to have locale information sent with them and enables
setlocale_from_msg() to adopt the locale of a client. After doing a READUPDATE[X]
operation on the $RECEIVE file, the server can adopt the locale of a client from information
sent with a WRITE or WRITEREAD message from the client.
• When the server processes a client’s request, call setlocale_from_msg() to change the
server locale to match that of the client before executing any other locale-sensitive function.
Refer to the setlocale_from_msg(3) reference page either online or in the Open System
Services Library Calls Reference Manual for more information.
Interoperability Between OSS and Guardian Locales
Open System Services provides two functions that enable interoperability between the OSS and
Guardian locales. The set_env_from_defaults() and set_defaults_from_env()
functions preserve the locale information of a parent process in one environment, and allow a child
process in the other environment to inherit the parent’s locale information.
To enable locale interoperability between the OSS and Guardian environments, HP has enhanced
the =_DEFAULTS DEFINE in the Guardian environment. The =_DEFAULTS DEFINE attributes now
include the locale environment variables defined by the POSIX standards and the XPG4
specifications.
For more information about using the set_env_from_defaults() and
set_defaults_from_env() functions and the locale environment variables, refer to the Software
Internationalization Guide.
Using the OSS Internationalization Subsystem 135