/usr/include/postfix/msg_output.h is in postfix-dev 2.9.1-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 | #ifndef _MSG_OUTPUT_FN_
#define _MSG_OUTPUT_FN_
/*++
/* NAME
/* msg_output 3h
/* SUMMARY
/* diagnostics output management
/* SYNOPSIS
/* #include <msg_output.h>
/* DESCRIPTION
/*
* System library.
*/
#include <stdarg.h>
/*
* External interface. Severity levels are documented to be monotonically
* increasing from 0 up to MSG_LAST.
*/
typedef void (*MSG_OUTPUT_FN) (int, const char *);
extern void msg_output(MSG_OUTPUT_FN);
extern void PRINTFLIKE(2, 3) msg_printf(int, const char *,...);
extern void msg_vprintf(int, const char *, va_list);
extern void msg_text(int, const char *);
#define MSG_INFO 0 /* informative */
#define MSG_WARN 1 /* warning (non-fatal) */
#define MSG_ERROR 2 /* error (fatal) */
#define MSG_FATAL 3 /* software error (fatal) */
#define MSG_PANIC 4 /* software error (fatal) */
#define MSG_LAST 4 /* highest-numbered severity level */
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*--*/
#endif
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