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.
catgets — read a program message
char *catgets(nl_catd catd, int set_id, int msg_id, const char *s);
The catgets() function shall attempt to read message msg_id, in set set_id, from the message catalog identified by catd. The catd argument is a message catalog descriptor returned from an earlier call to catopen(). The results are undefined if catd is not a value returned by catopen() for a message catalog still open in the process. The s argument points to a default message string which shall be returned by catgets() if it cannot retrieve the identified message.
The catgets() function need not be thread-safe.
If the identified message is retrieved successfully, catgets() shall return a pointer to an internal buffer area containing the null-terminated message string. If the call is unsuccessful for any reason, s shall be returned and errno shall be set to indicate the error.
The catgets() function shall fail if:
- The read operation was terminated due to the receipt of a signal, and no data was transferred.
The catgets() function may fail if:
- The message identified by set_id and msg_id is not in the message catalog.
- The catd argument is not a valid message catalog descriptor open for reading.
- The message identified by set_id and msg_id in the specified message catalog did not satisfy implementation-defined security criteria.
The following sections are informative.
The Base Definitions volume of POSIX.1‐2008, <nl_types.h>
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 .
- The message catalog identified by catd is corrupted.
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