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PROLOG | NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | EXAMPLES | APPLICATION USAGE | RATIONALE | FUTURE DIRECTIONS | SEE ALSO | COPYRIGHT |
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CATOPEN(3P) POSIX Programmer's Manual CATOPEN(3P)
This manual page is part of the POSIX Programmer's Manual. The Linux
implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior), or
the interface may not be implemented on Linux.
catopen — open a message catalog
#include <nl_types.h>
nl_catd catopen(const char *name, int oflag);
The catopen() function shall open a message catalog and return a
message catalog descriptor. The name argument specifies the name of
the message catalog to be opened. If name contains a '/', then name
specifies a complete name for the message catalog. Otherwise, the
environment variable NLSPATH is used with name substituted for the %N
conversion specification (see the Base Definitions volume of
POSIX.1‐2008, Chapter 8, Environment Variables). If NLSPATH exists
in the environment when the process starts, then if the process has
appropriate privileges, the behavior of catopen() is undefined. If
NLSPATH does not exist in the environment, or if a message catalog
cannot be found in any of the components specified by NLSPATH, then
an implementation-defined default path shall be used. This default
may be affected by the setting of LC_MESSAGES if the value of oflag
is NL_CAT_LOCALE, or the LANG environment variable if oflag is 0.
A message catalog descriptor shall remain valid in a process until
that process closes it, or a successful call to one of the exec
functions. A change in the setting of the LC_MESSAGES category may
invalidate existing open catalogs.
If a file descriptor is used to implement message catalog
descriptors, the FD_CLOEXEC flag shall be set; see <fcntl.h>.
If the value of the oflag argument is 0, the LANG environment
variable is used to locate the catalog without regard to the
LC_MESSAGES category. If the oflag argument is NL_CAT_LOCALE, the
LC_MESSAGES category is used to locate the message catalog (see the
Base Definitions volume of POSIX.1‐2008, Section 8.2,
Internationalization Variables).
Upon successful completion, catopen() shall return a message catalog
descriptor for use on subsequent calls to catgets() and catclose().
Otherwise, catopen() shall return (nl_catd) −1 and set errno to
indicate the error.
The catopen() function may fail if:
EACCES Search permission is denied for the component of the path
prefix of the message catalog or read permission is denied for
the message catalog.
EMFILE All file descriptors available to the process are currently
open.
ENAMETOOLONG
The length of a component of a pathname is longer than
{NAME_MAX}.
ENAMETOOLONG
The length of a pathname exceeds {PATH_MAX}, or pathname
resolution of a symbolic link produced an intermediate result
with a length that exceeds {PATH_MAX}.
ENFILE Too many files are currently open in the system.
ENOENT The message catalog does not exist or the name argument points
to an empty string.
ENOMEM Insufficient storage space is available.
ENOTDIR
A component of the path prefix of the message catalog names an
existing file that is neither a directory nor a symbolic link
to a directory, or the pathname of the message catalog
contains at least one non-<slash> character and ends with one
or more trailing <slash> characters and the last pathname
component names an existing file that is neither a directory
nor a symbolic link to a directory.
The following sections are informative.
None.
Some implementations of catopen() use malloc() to allocate space for
internal buffer areas. The catopen() function may fail if there is
insufficient storage space available to accommodate these buffers.
Conforming applications must assume that message catalog descriptors
are not valid after a call to one of the exec functions.
Application developers should be aware that guidelines for the
location of message catalogs have not yet been developed. Therefore
they should take care to avoid conflicting with catalogs used by
other applications and the standard utilities.
None.
None.
catclose(3p), catgets(3p)
The Base Definitions volume of POSIX.1‐2008, Chapter 8, Environment
Variables, fcntl.h(0p), nl_types.h(0p),
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2013 Edition, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The Open
Group Base Specifications Issue 7, Copyright (C) 2013 by the
Institute of Electrical and Electronics Engineers, Inc and The Open
Group. (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1
applied.) In the event of any discrepancy between this version and
the original IEEE and The Open Group Standard, the original IEEE and
The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.unix.org/online.html .
Any typographical or formatting errors that appear in this page are
most likely to have been introduced during the conversion of the
source files to man page format. To report such errors, see
https://www.kernel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group 2013 CATOPEN(3P)
Pages that refer to this page: nl_types.h(0p), catclose(3p), catgets(3p), setlocale(3p)
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