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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ENVIRONMENT | ATTRIBUTES | CONFORMING TO | NOTES | SEE ALSO | COLOPHON |
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CATOPEN(3) Linux Programmer's Manual CATOPEN(3)
catopen, catclose - open/close a message catalog
#include <nl_types.h>
nl_catd catopen(const char *name, int flag);
int catclose(nl_catd catalog);
The function catopen() opens a message catalog and returns a catalog
descriptor. The descriptor remains valid until catclose() or
execve(2). If a file descriptor 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 pathname 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 descriptors.
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 setting 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.
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 error. The possible error values include all
possible values for the open(2) call.
The function catclose() returns 0 on success, or -1 on failure.
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.
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 │
└───────────┴───────────────┴─────────────┘
POSIX.1-2001, POSIX.1-2008.
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.
catgets(3), setlocale(3)
This page is part of release 4.15 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
GNU 2015-08-08 CATOPEN(3)
Pages that refer to this page: catgets(3), environ(7), locale(7)
Copyright and license for this manual page
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