Originální popis anglicky:
catopen - open a message catalog
Návod, kniha: POSIX Programmer's Manual
#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
IEEE Std 1003.1-2001, 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 IEEE Std 1003.1-2001, 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
- {OPEN_MAX} file descriptors are currently open in the
calling process.
- ENAMETOOLONG
- The length of a pathname of the message catalog exceeds
{PATH_MAX} or a pathname component is longer than {NAME_MAX}.
- ENAMETOOLONG
- Pathname resolution of a symbolic link produced an
intermediate result whose length 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 is
not 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 writers 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() ,
catgets() , the Base Definitions volume of
IEEE Std 1003.1-2001,
<fcntl.h>,
<nl_types.h>, the Shell and Utilities volume of
IEEE Std 1003.1-2001
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable
Operating System Interface (POSIX), The Open Group Base Specifications Issue
6, Copyright (C) 2001-2003 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
.
