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catgets - Man Page

read a program message


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.


#include <nl_types.h>

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.

Return Value

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 message identified by set_id and msg_id is not in the message catalog.

The catgets() function may fail if:


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 message catalog identified by catd is corrupted.

The following sections are informative.



Application Usage




Future Directions


See Also

catclose(), catopen()

The Base Definitions volume of POSIX.1-2017, <nl_types.h>

Referenced By

catclose(3p), catopen(3p), nl_types.h(0p).

2017 IEEE/The Open Group POSIX Programmer's Manual