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/* Copyright (c) 2008, 2009
* Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de)
* Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de)
* Micah Cowan (micah@cowan.name)
* Sadrul Habib Chowdhury (sadrul@users.sourceforge.net)
* Copyright (c) 1993-2002, 2003, 2005, 2006, 2007
* Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de)
* Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de)
* Copyright (c) 1987 Oliver Laumann
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program (see the file COPYING); if not, see
* https://www.gnu.org/licenses/, or contact Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301 USA
*
****************************************************************
* $Id$ GNU
*/
struct logfile
{
struct logfile *next;
FILE *fp; /* a hopefully uniq filepointer to the log file */
char *name; /* the name. used to reopen, when stat fails. */
int opencount; /* synchronize logfopen() and logfclose() */
int writecount; /* increments at logfwrite(), counts write() and fflush() */
int flushcount; /* increments at logfflush(), zeroed at logfwrite() */
struct stat *st; /* how the file looks like */
};
/*
* open a logfile, The second argument must be NULL, when the named file
* is already a logfile or must be a appropriatly opened file pointer
* otherwise.
* example: l = logfopen(name, islogfile(name) : NULL ? fopen(name, "a"));
*/
struct logfile *logfopen __P((char *name, FILE *fp));
/*
* lookup a logfile by name. This is useful, so that we can provide
* logfopen with a nonzero second argument, exactly when needed.
* islogfile(NULL); returns nonzero if there are any open logfiles at all.
*/
int islogfile __P((char *name));
/*
* logfclose does free()
*/
int logfclose __P((struct logfile *));
int logfwrite __P((struct logfile *, char *, int));
/*
* logfflush should be called periodically. If no argument is passed,
* all logfiles are flushed, else the specified file
* the number of flushed filepointers is returned
*/
int logfflush __P((struct logfile *ifany));
/*
* a reopen function may be registered here, in case you want to bring your
* own (more secure open), it may come along with a private data pointer.
* this function is called, whenever logfwrite/logfflush detect that the
* file has been (re)moved, truncated or changed by someone else.
* if you provide NULL as parameter to logreopen_register, the builtin
* reopen function will be reactivated.
*/
void logreopen_register __P((int (*fn) __P((char *, int, struct logfile *)) ));
/*
* Your custom reopen function is required to reuse the exact
* filedescriptor.
* See logfile.c for further specs and an example.
*
* lf_move_fd may help you here, if you do not have dup2(2).
* It closes fd and opens wantfd to access whatever fd accessed.
*/
int lf_move_fd __P((int fd, int wantfd));
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