catopen(3p) — Linux manual page


CATOPEN(3P)               POSIX Programmer's Manual              CATOPEN(3P)

PROLOG         top

       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.

NAME         top

       catopen — open a message catalog

SYNOPSIS         top

       #include <nl_types.h>

       nl_catd catopen(const char *name, int oflag);

DESCRIPTION         top

       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).

RETURN VALUE         top

       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.

ERRORS         top

       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

              The length of a component of a pathname is longer than

              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.

              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.

EXAMPLES         top



       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.

RATIONALE         top




SEE ALSO         top

       catclose(3p), catgets(3p)

       The Base Definitions volume of POSIX.1‐2008, Chapter 8, Environment
       Variables, fcntl.h(0p), nl_types.h(0p),

COPYRIGHT         top

       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 .

       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 .

IEEE/The Open Group                 2013                         CATOPEN(3P)

Pages that refer to this page: nl_types.h(0p)catclose(3p)catgets(3p)setlocale(3p)