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CATOPEN(3) Linux Programmer's Manual CATOPEN(3)
NAME
catopen, catclose - open/close a message catalog
SYNOPSIS
#include <nl_types.h>
nl_catd catopen(const char *name, int flag);
int catclose(nl_catd catalog);
DESCRIPTION
The function catopen() opens a message catalog and returns a catalog descriptor. The descriptor remains valid until catclose() or execve(2). If a file descrip‐
tor is used to implement catalog descriptors, then the FD_CLOEXEC flag will be set.
The argument name specifies the name of the message catalog to be opened. If name specifies an absolute path (i.e., contains a '/'), then name specifies a path‐
name for the message catalog. Otherwise, the environment variable NLSPATH is used with name substituted for %N (see locale(7)). It is unspecified whether
NLSPATH will be used when the process has root privileges. If NLSPATH does not exist in the environment, or if a message catalog cannot be opened in any of the
paths specified by it, then an implementation defined path is used. This latter default path may depend on the LC_MESSAGES locale setting when the flag argument
is NL_CAT_LOCALE and on the LANG environment variable when the flag argument is 0. Changing the LC_MESSAGES part of the locale may invalidate open catalog de‐
scriptors.
The flag argument to catopen() is used to indicate the source for the language to use. If it is set to NL_CAT_LOCALE, then it will use the current locale set‐
ting for LC_MESSAGES. Otherwise, it will use the LANG environment variable.
The function catclose() closes the message catalog identified by catalog. It invalidates any subsequent references to the message catalog defined by catalog.
RETURN VALUE
The function catopen() returns a message catalog descriptor of type nl_catd on success. On failure, it returns (nl_catd) -1 and sets errno to indicate the er‐
ror. The possible error values include all possible values for the open(2) call.
The function catclose() returns 0 on success, or -1 on failure.
ENVIRONMENT
LC_MESSAGES
May be the source of the LC_MESSAGES locale setting, and thus determine the language to use if flag is set to NL_CAT_LOCALE.
LANG The language to use if flag is 0.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
┌──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┬───────────────┬─────────────┐
│Interface │ Attribute │ Value │
├──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────────┤
│catopen() │ Thread safety │ MT-Safe env │
├──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┼───────────────┼─────────────┤
│catclose() │ Thread safety │ MT-Safe │
└──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┴───────────────┴─────────────┘
CONFORMING TO
POSIX.1-2001, POSIX.1-2008.
NOTES
The above is the POSIX.1 description. The glibc value for NL_CAT_LOCALE is 1. The default path varies, but usually looks at a number of places below
/usr/share/locale.
SEE ALSO
catgets(3), setlocale(3)
GNU 2021-03-22 CATOPEN(3)