fmtmsg.h(0P)		   POSIX Programmer's Manual		  fmtmsg.h(0P)

PROLOG
       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
       fmtmsg.h — message display structures

SYNOPSIS
       #include <fmtmsg.h>

DESCRIPTION
       The <fmtmsg.h> header shall define the following symbolic constants:

       MM_HARD	     Source of the condition is hardware.

       MM_SOFT	     Source of the condition is software.

       MM_FIRM	     Source of the condition is firmware.

       MM_APPL	     Condition detected by application.

       MM_UTIL	     Condition detected by utility.

       MM_OPSYS	     Condition detected by operating system.

       MM_RECOVER    Recoverable error.

       MM_NRECOV     Non-recoverable error.

       MM_HALT	     Error causing application to halt.

       MM_ERROR	     Application has encountered a non-fatal fault.

       MM_WARNING    Application has detected unusual non-error condition.

       MM_INFO	     Informative message.

       MM_NOSEV	     No severity level provided for the message.

       MM_PRINT	     Display message on standard error.

       MM_CONSOLE    Display message on system console.

       The table below indicates the null values and identifiers for fmtmsg()
       arguments. The <fmtmsg.h> header shall define the symbolic constants in
       the Identifier column, which shall have the type indicated in the Type
       column:

		    ┌─────────┬────────┬────────────┬────────────┐
		    │Argument │	 Type  │ Null-Value │ Identifier │
		    ├─────────┼────────┼────────────┼────────────┤
		    │label    │ char * │ (char*)0   │ MM_NULLLBL │
		    │severity │ int    │ 0	    │ MM_NULLSEV │
		    │class    │ long   │ 0L	    │ MM_NULLMC	 │
		    │text     │ char * │ (char*)0   │ MM_NULLTXT │
		    │action   │ char * │ (char*)0   │ MM_NULLACT │
		    │tag      │ char * │ (char*)0   │ MM_NULLTAG │
		    └─────────┴────────┴────────────┴────────────┘
       The <fmtmsg.h> header shall also define the following symbolic
       constants for use as return values for fmtmsg():

       MM_OK	     The function succeeded.

       MM_NOTOK	     The function failed completely.

       MM_NOMSG	     The function was unable to generate a message on standard
		     error, but otherwise succeeded.

       MM_NOCON	     The function was unable to generate a console message,
		     but otherwise succeeded.

       The following shall be declared as a function and may also be defined
       as a macro. A function prototype shall be provided.


	   int fmtmsg(long, const char *, int,
	       const char *, const char *, const char *);

       The following sections are informative.

APPLICATION USAGE
       None.

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       The System Interfaces volume of POSIX.1‐2017, fmtmsg()

COPYRIGHT
       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			  fmtmsg.h(0P)