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#include <fmtmsg.h>
The <fmtmsg.h> header defines the following macros, which expand to constant integer expressions:
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(3C) arguments. The <fmtmsg.h> header defines the macros in the Identifier column, which expand to constant expressions that expand to expressions of the type indicated in the Type column:
| Argument | Type | Null-Value | Identifier |
| label | char* | (char*) NULL | MM_NULLLBL |
| severity | int | 0 | MM_NULLSEV |
| class | long | 0L | MM_NULLMC |
| text | char* | (char*) NULL | MM_NULLTXT |
| action | char* | (char*) NULL | MM_NULLACT |
| tag | char* | (char*) NULL | MM_NULLTAG |
The <fmtmsg.h> header also defines the following macros 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.
See attributes(5) for descriptions of the following attributes:
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| Interface Stability | Standard |
fmtmsg(3C), attributes(5), standards(5)