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Annotation of fam/fam/IMon.h, Revision 1.1.1.1

1.1       trev        1: //  Copyright (C) 1999 Silicon Graphics, Inc.  All Rights Reserved.
                      2: //
                      3: //  This program is free software; you can redistribute it and/or modify it
                      4: //  under the terms of version 2 of the GNU General Public License as
                      5: //  published by the Free Software Foundation.
                      6: //
                      7: //  This program is distributed in the hope that it would be useful, but
                      8: //  WITHOUT ANY WARRANTY; without even the implied warranty of
                      9: //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  Further, any
                     10: //  license provided herein, whether implied or otherwise, is limited to
                     11: //  this program in accordance with the express provisions of the GNU
                     12: //  General Public License.  Patent licenses, if any, provided herein do not
                     13: //  apply to combinations of this program with other product or programs, or
                     14: //  any other product whatsoever.  This program is distributed without any
                     15: //  warranty that the program is delivered free of the rightful claim of any
                     16: //  third person by way of infringement or the like.  See the GNU General
                     17: //  Public License for more details.
                     18: //
                     19: //  You should have received a copy of the GNU General Public License along
                     20: //  with this program; if not, write the Free Software Foundation, Inc., 59
                     21: //  Temple Place - Suite 330, Boston MA 02111-1307, USA.
                     22:
                     23: #ifndef IMon_included
                     24: #define IMon_included
                     25:
                     26: #include "config.h"
                     27: #include <sys/stat.h>
                     28: #include <sys/types.h>
                     29:
                     30: #include "Boolean.h"
                     31:
                     32: struct stat;
                     33:
                     34: //  IMon is an object encapsulating the interface to /dev/imon.
                     35: //  There can only be one instantiation of the IMon object.
                     36: //
                     37: //  The user of this object uses express() and revoke() to
                     38: //  express/revoke interest in a file to imon.  There is also
                     39: //  a callback, the EventHandler.  When an imon event comes in,
                     40: //  the EventHandler is called.
                     41: //
                     42: //  The user of the IMon object is the Interest class.
                     43:
                     44: class IMon {
                     45:
                     46: public:
                     47:
                     48:     enum Status { OK = 0, BAD = -1 };
                     49:     enum Event { EXEC, EXIT, CHANGE };
                     50:
                     51:     typedef void (*EventHandler)(dev_t, ino_t, int event);
                     52:
                     53:     IMon(EventHandler h);
                     54:     ~IMon();
                     55:
                     56:     static bool is_active();
                     57:
                     58:     Status express(const char *name, struct stat *stat_return);
                     59:     Status revoke(const char *name, dev_t dev, ino_t ino);
                     60:
                     61: private:
                     62:
                     63:     //  Class Variables
                     64:
                     65:     static int imonfd;
                     66:     static EventHandler ehandler;
                     67:
                     68:     static void read_handler(int fd, void *closure);
                     69:
                     70:
                     71:     //
                     72:     // Low-level imon routines.
                     73:     //
                     74:     static int imon_open();
                     75:     Status imon_express(const char *name, struct stat *stat_return);
                     76:     Status imon_revoke(const char *name, dev_t dev, ino_t ino);
                     77:
                     78:     IMon(const IMon&);			// Do not copy
                     79:     IMon & operator = (const IMon&);		//  or assign.
                     80:
                     81: };
                     82:
                     83: #endif /* !IMon_included */