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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 pathname 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.1‐2017, 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.1‐2017, 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.
To be sure that messages produced by an application running with
appropriate privileges cannot be used by an attacker setting an
unexpected value for NLSPATH in the environment to confuse a
system administrator, such applications should use pathnames
containing a '/' to get defined behavior when using catopen() to
open a message catalog.
None.
None.
catclose(3p), catgets(3p)
The Base Definitions volume of POSIX.1‐2017, 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 1003.1-2017, Standard for Information
Technology -- Portable Operating System Interface (POSIX), The
Open Group Base Specifications Issue 7, 2018 Edition, Copyright
(C) 2018 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. 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.opengroup.org/unix/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 2017 CATOPEN(3P)
Pages that refer to this page: nl_types.h(0p), catclose(3p), catgets(3p), setlocale(3p)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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