catopen(3) [osx man page]
CATOPEN(3) BSD Library Functions Manual CATOPEN(3) NAME
catopen -- open message catalog LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <nl_types.h> nl_catd catopen(const char *name, int oflag); DESCRIPTION
The catopen() function opens the message catalog specified by name and returns a message catalog descriptor. If name contains a '/' then name specifies the full pathname for the message catalog, otherwise the value of the environment variable NLSPATH is used with the following substitutions: %N The value of the name argument. %L The value of the LANG environment variable or the LC_MESSAGES category (see below). %l The language element from the LANG environment variable or from the LC_MESSAGES category. %t The territory element from the LANG environment variable or from the LC_MESSAGES category. %c The codeset element from the LANG environment variable or from the LC_MESSAGES category. %% A single % character. An empty string is substituted for undefined values. Path names templates defined in NLSPATH are separated by colons (':'). A leading or two adjacent colons is equivalent to specifying %N. If the oflag argument is set to the NL_CAT_LOCALE constant, LC_MESSAGES locale category used to open the message catalog; using NL_CAT_LOCALE conforms to the X/Open Portability Guide Issue 4 (``XPG4'') standard. You can specify 0 for compatibility with X/Open Portability Guide Issue 3 (``XPG3''); when oflag is set to 0, the LANG environment variable determines the message catalog locale. A message catalog descriptor remains valid in a process until that process closes it, or until a successful call to one of the exec(3) func- tion. RETURN VALUES
Upon successful completion, catopen() returns a message catalog descriptor. Otherwise, (nl_catd) -1 is returned and errno is set to indicate the error. ERRORS
[EINVAL] Argument name does not point to a valid message catalog, or catalog is corrupt. [ENAMETOOLONG] An entire path to the message catalog exceeded 1024 characters. [ENOENT] The named message catalog does not exists, or the name argument points to an empty string. [ENOMEM] Insufficient memory is available. SEE ALSO
gencat(1), catclose(3), catgets(3), setlocale(3) STANDARDS
The catopen() function conforms to IEEE Std 1003.1-2001 (``POSIX.1''). BSD
February 12, 2005 BSD
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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 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 and 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 envi- ronment, 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 vari- able 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. 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 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. 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. CONFORMING TO
POSIX.1-2001. It is unclear what the source was for the constants MCLoadBySet and MCLoadAll (see below). NOTES
The above is the POSIX.1-2001 description. The glibc value for NL_CAT_LOCALE is 1. (Compare MCLoadAll below.) The default path varies, but usually looks at a number of places below /usr/share/locale. Linux Notes These functions are available for Linux since libc 4.4.4c. In the case of linux libc4 and libc5, the catalog descriptor nl_catd is a mmap(2)'ed area of memory and not a file descriptor. The flag argument to catopen() should be either MCLoadBySet (=0) or MCLoadAll (=1). The former value indicates that a set from the catalog is to be loaded when needed, whereas the latter causes the initial call to catopen() to load the entire catalog into memory. The default search path varies, but usually looks at a number of places below /etc/locale and /usr/lib/locale. SEE ALSO
catgets(3), setlocale(3) COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. GNU
2001-12-14 CATOPEN(3)