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Olaf Rempel 2006-10-06 22:05:44 +02:00
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*.o
*.d
isync

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Olaf Rempel <razzor@kopf-tisch.de>

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GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.
59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
The licenses for most software are designed to take away your
freedom to share and change it. By contrast, the GNU General Public
License is intended to guarantee your freedom to share and change free
software--to make sure the software is free for all its users. This
General Public License applies to most of the Free Software
Foundation's software and to any other program whose authors commit to
using it. (Some other Free Software Foundation software is covered by
the GNU Library General Public License instead.) You can apply it to
your programs, too.
When we speak of free software, we are referring to freedom, not
price. Our General Public Licenses are designed to make sure that you
have the freedom to distribute copies of free software (and charge for
this service if you wish), that you receive source code or can get it
if you want it, that you can change the software or use pieces of it
in new free programs; and that you know you can do these things.
To protect your rights, we need to make restrictions that forbid
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These restrictions translate to certain responsibilities for you if you
distribute copies of the software, or if you modify it.
For example, if you distribute copies of such a program, whether
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you have. You must make sure that they, too, receive or can get the
source code. And you must show them these terms so they know their
rights.
We protect your rights with two steps: (1) copyright the software, and
(2) offer you this license which gives you legal permission to copy,
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Also, for each author's protection and ours, we want to make certain
that everyone understands that there is no warranty for this free
software. If the software is modified by someone else and passed on, we
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Finally, any free program is threatened constantly by software
patents. We wish to avoid the danger that redistributors of a free
program will individually obtain patent licenses, in effect making the
program proprietary. To prevent this, we have made it clear that any
patent must be licensed for everyone's free use or not licensed at all.
The precise terms and conditions for copying, distribution and
modification follow.
GNU GENERAL PUBLIC LICENSE
TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
0. This License applies to any program or other work which contains
a notice placed by the copyright holder saying it may be distributed
under the terms of this General Public License. The "Program", below,
refers to any such program or work, and a "work based on the Program"
means either the Program or any derivative work under copyright law:
that is to say, a work containing the Program or a portion of it,
either verbatim or with modifications and/or translated into another
language. (Hereinafter, translation is included without limitation in
the term "modification".) Each licensee is addressed as "you".
Activities other than copying, distribution and modification are not
covered by this License; they are outside its scope. The act of
running the Program is not restricted, and the output from the Program
is covered only if its contents constitute a work based on the
Program (independent of having been made by running the Program).
Whether that is true depends on what the Program does.
1. You may copy and distribute verbatim copies of the Program's
source code as you receive it, in any medium, provided that you
conspicuously and appropriately publish on each copy an appropriate
copyright notice and disclaimer of warranty; keep intact all the
notices that refer to this License and to the absence of any warranty;
and give any other recipients of the Program a copy of this License
along with the Program.
You may charge a fee for the physical act of transferring a copy, and
you may at your option offer warranty protection in exchange for a fee.
2. You may modify your copy or copies of the Program or any portion
of it, thus forming a work based on the Program, and copy and
distribute such modifications or work under the terms of Section 1
above, provided that you also meet all of these conditions:
a) You must cause the modified files to carry prominent notices
stating that you changed the files and the date of any change.
b) You must cause any work that you distribute or publish, that in
whole or in part contains or is derived from the Program or any
part thereof, to be licensed as a whole at no charge to all third
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c) If the modified program normally reads commands interactively
when run, you must cause it, when started running for such
interactive use in the most ordinary way, to print or display an
announcement including an appropriate copyright notice and a
notice that there is no warranty (or else, saying that you provide
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these conditions, and telling the user how to view a copy of this
License. (Exception: if the Program itself is interactive but
does not normally print such an announcement, your work based on
the Program is not required to print an announcement.)
These requirements apply to the modified work as a whole. If
identifiable sections of that work are not derived from the Program,
and can be reasonably considered independent and separate works in
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distribute the same sections as part of a whole which is a work based
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Thus, it is not the intent of this section to claim rights or contest
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collective works based on the Program.
In addition, mere aggregation of another work not based on the Program
with the Program (or with a work based on the Program) on a volume of
a storage or distribution medium does not bring the other work under
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except as expressly provided under this License. Any attempt
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implemented by public license practices. Many people have made
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through that system in reliance on consistent application of that
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This section is intended to make thoroughly clear what is believed to
be a consequence of the rest of this License.
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certain countries either by patents or by copyrighted interfaces, the
original copyright holder who places the Program under this License
may add an explicit geographical distribution limitation excluding
those countries, so that distribution is permitted only in or among
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of the General Public License from time to time. Such new versions will
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NO WARRANTY
11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
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WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
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INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING
OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED
TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY
YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
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POSSIBILITY OF SUCH DAMAGES.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
convey the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) 19yy <name of author>
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 2 of the License, 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; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Also add information on how to contact you by electronic and paper mail.
If the program is interactive, make it output a short notice like this
when it starts in an interactive mode:
Gnomovision version 69, Copyright (C) 19yy name of author
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, the commands you use may
be called something other than `show w' and `show c'; they could even be
mouse-clicks or menu items--whatever suits your program.
You should also get your employer (if you work as a programmer) or your
school, if any, to sign a "copyright disclaimer" for the program, if
necessary. Here is a sample; alter the names:
Yoyodyne, Inc., hereby disclaims all copyright interest in the program
`Gnomovision' (which makes passes at compilers) written by James Hacker.
<signature of Ty Coon>, 1 April 1989
Ty Coon, President of Vice
This General Public License does not permit incorporating your program into
proprietary programs. If your program is a subroutine library, you may
consider it more useful to permit linking proprietary applications with the
library. If this is what you want to do, use the GNU Library General
Public License instead of this License.

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# Toplevel Makefile
SRC := $(wildcard *.c)
CFLAGS := -O2 -Wall
# ############################
all: isync
isync: $(SRC:%.c=%.o)
$(CC) $(CFLAGS) $^ -o $@
%.d: %.c
$(CC) $(CFLAGS) -MM -c $< -o $@
%.o: %.c
$(CC) $(CFLAGS) -o $@ -c $<
clean:
rm -rf *.d *.o isync
-include $(SRC:.c=.d)

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/***************************************************************************
* Copyright (C) 10/2006 by Olaf Rempel *
* razzor@kopf-tisch.de *
* *
* 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 2 of the License, 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; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/time.h>
#include <sys/types.h>
#include "list.h"
#include "logging.h"
#include "event.h"
static LIST_HEAD(readfd_list);
static LIST_HEAD(writefd_list);
static LIST_HEAD(exceptfd_list);
static LIST_HEAD(timeout_list);
static int modified;
struct fd_entry {
struct list_head list;
int fd;
int type;
int (*callback)(int fd, void *privdata);
void *privdata;
};
struct timeout_entry {
struct list_head list;
struct timeval timeout;
struct timeval nextrun;
int (*callback)(void *privdata);
void *privdata;
};
int event_add_fd(int fd, int type, int (*callback)(int fd, void *privdata), void *privdata)
{
if (fd < 0 || fd > FD_SETSIZE)
return -1;
struct fd_entry *entry;
entry = malloc(sizeof(struct fd_entry));
if (entry == NULL) {
log_print(LOG_ERROR, "event_add_fd(): out of memory");
return -1;
}
entry->fd = fd;
entry->type = type;
entry->callback = callback;
entry->privdata = privdata;
switch (type) {
case FD_READ:
list_add_tail(&entry->list, &readfd_list);
break;
case FD_WRITE:
list_add_tail(&entry->list, &writefd_list);
break;
case FD_EXCEPT:
list_add_tail(&entry->list, &exceptfd_list);
break;
default:
log_print(LOG_ERROR, "add_fd(): unknown type");
free(entry);
return -1;
}
modified = 1;
return 0;
}
int event_remove_fd(int fd)
{
struct fd_entry *entry, *tmp;
list_for_each_entry_safe(entry, tmp, &readfd_list, list) {
if (entry->fd == fd) {
list_del(&entry->list);
free(entry);
modified = 1;
return 0;
}
}
list_for_each_entry_safe(entry, tmp, &writefd_list, list) {
if (entry->fd == fd) {
list_del(&entry->list);
free(entry);
modified = 1;
return 0;
}
}
list_for_each_entry_safe(entry, tmp, &exceptfd_list, list) {
if (entry->fd == fd) {
list_del(&entry->list);
free(entry);
modified = 1;
return 0;
}
}
return -1;
}
static void calc_nextrun(struct timeval *timeout, struct timeval *nextrun)
{
struct timeval now;
gettimeofday(&now, NULL);
nextrun->tv_usec = now.tv_usec + timeout->tv_usec;
nextrun->tv_sec = now.tv_sec + timeout->tv_sec;
if (nextrun->tv_usec >= 1000000) {
nextrun->tv_usec -= 1000000;
nextrun->tv_sec++;
}
}
static void calc_timeout(struct timeval *timeout, struct timeval *nextrun)
{
struct timeval now;
gettimeofday(&now, NULL);
timeout->tv_usec = nextrun->tv_usec - now.tv_usec;
timeout->tv_sec = nextrun->tv_sec - now.tv_sec;
if (timeout->tv_usec < 0) {
timeout->tv_usec += 1000000;
timeout->tv_sec--;
}
}
static void schedule_nextrun(struct timeout_entry *entry)
{
struct timeout_entry *search;
list_for_each_entry(search, &timeout_list, list) {
if (search->nextrun.tv_sec > entry->nextrun.tv_sec) {
list_add_tail(&entry->list, &search->list);
return;
} else if (search->nextrun.tv_sec == entry->nextrun.tv_sec &&
search->nextrun.tv_usec > entry->nextrun.tv_usec) {
list_add_tail(&entry->list, &search->list);
return;
}
}
list_add_tail(&entry->list, &timeout_list);
}
int event_add_timeout(struct timeval *timeout, int (*callback)(void *privdata), void *privdata)
{
struct timeout_entry *entry;
entry = malloc(sizeof(struct timeout_entry));
if (entry == NULL) {
log_print(LOG_ERROR, "event_add_timeout(): out of memory");
return -1;
}
memcpy(&entry->timeout, timeout, sizeof(entry->timeout));
entry->callback = callback;
entry->privdata = privdata;
calc_nextrun(&entry->timeout, &entry->nextrun);
schedule_nextrun(entry);
return 0;
}
int event_loop(void)
{
modified = 1;
while (1) {
fd_set readfds, *readfds_p = NULL;
fd_set writefds, *writefds_p = NULL;
fd_set exceptfds, *exceptfds_p =NULL;
struct timeval timeout, *timeout_p = NULL;
if (modified) {
struct fd_entry *entry;
if (!list_empty(&readfd_list)) {
FD_ZERO(&readfds);
list_for_each_entry(entry, &readfd_list, list)
FD_SET(entry->fd, &readfds);
readfds_p = &readfds;
}
if (!list_empty(&writefd_list)) {
FD_ZERO(&writefds);
list_for_each_entry(entry, &writefd_list, list)
FD_SET(entry->fd, &writefds);
writefds_p = &writefds;
}
if (!list_empty(&exceptfd_list)) {
FD_ZERO(&exceptfds);
list_for_each_entry(entry, &exceptfd_list, list)
FD_SET(entry->fd, &exceptfds);
exceptfds_p = &exceptfds;
}
modified = 0;
}
if (!list_empty(&timeout_list)) {
struct timeout_entry *entry, *tmp;
list_for_each_entry_safe(entry, tmp, &timeout_list, list) {
calc_timeout(&timeout, &entry->nextrun);
if (timeout.tv_sec >= 0 && timeout.tv_usec > 0) {
timeout_p = &timeout;
break;
}
// delayed timeout, exec NOW!
list_del(&entry->list);
int ret = entry->callback(entry->privdata);
if (ret == 0) {
calc_nextrun(&entry->timeout, &entry->nextrun);
schedule_nextrun(entry);
} else {
free(entry);
}
}
}
int i = select(FD_SETSIZE, readfds_p, writefds_p, exceptfds_p, timeout_p);
if (i < 0) {
/* On error, -1 is returned, and errno is set
* appropriately; the sets and timeout become
* undefined, so do not rely on their contents
* after an error.
*/
modified = 1;
continue;
} else if (i == 0 && !list_empty(&timeout_list)) {
struct timeout_entry *entry;
entry = list_entry(timeout_list.next, typeof(*entry), list);
list_del(&entry->list);
int ret = entry->callback(entry->privdata);
if (ret == 0) {
calc_nextrun(&entry->timeout, &entry->nextrun);
schedule_nextrun(entry);
} else {
free(entry);
}
}
if (readfds_p) {
struct fd_entry *entry, *tmp;
list_for_each_entry_safe(entry, tmp, &readfd_list, list) {
if (!FD_ISSET(entry->fd, &readfds))
continue;
if (entry->callback(entry->fd, entry->privdata) != 0) {
list_del(&entry->list);
free(entry);
modified = 1;
}
}
}
if (writefds_p) {
struct fd_entry *entry, *tmp;
list_for_each_entry_safe(entry, tmp, &writefd_list, list) {
if (FD_ISSET(entry->fd, &writefds))
continue;
if (entry->callback(entry->fd, entry->privdata) != 0) {
list_del(&entry->list);
free(entry);
modified = 1;
}
}
}
if (exceptfds_p) {
struct fd_entry *entry, *tmp;
list_for_each_entry_safe(entry, tmp, &exceptfd_list, list) {
if (FD_ISSET(entry->fd, &exceptfds))
continue;
if (entry->callback(entry->fd, entry->privdata) != 0) {
list_del(&entry->list);
free(entry);
modified = 1;
}
}
}
}
}

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#ifndef _EVENT_H_
#define _EVENT_H_
#include <sys/time.h>
#define FD_READ 0x01
#define FD_WRITE 0x02
#define FD_EXCEPT 0x04
#define event_add_readfd(fd, callback, privdata) \
event_add_fd(fd, FD_READ, callback, privdata)
#define event_add_writefd(fd, callback, privdata) \
event_add_fd(fd, FD_WRITE, callback, privdata)
#define event_add_exceptfd(fd, callback, privdata) \
event_add_fd(fd, FD_EXCEPT, callback, privdata)
int event_add_fd(int fd, int type, int (*callback)(int fd, void *privdata), void *privdata);
int event_add_timeout(struct timeval *timeout, int (*callback)(void *privdata), void *privdata);
int event_remove_fd(int fd);
int event_loop(void);
#endif /* _EVENT_H_ */

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/***************************************************************************
* Copyright (C) 10/2006 by Olaf Rempel *
* razzor@kopf-tisch.de *
* *
* 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 2 of the License, 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; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <dirent.h>
#include <errno.h>
#include <sys/ioctl.h>
#include "sys/inotify.h"
#include "logging.h"
#define MAX_WATCHES 8192
#define WATCH_MASK (IN_DONT_FOLLOW | IN_ONLYDIR | IN_MOVE | IN_DELETE | IN_CREATE)
struct watch_entry {
int parent;
char *path;
};
static struct watch_entry *watch_arr;
/*
* adds a watch
* - updates watch_arr info (parent & path)
*
* returns watch discriptor or -1 on failure
*/
static int add_watch(int inotify_fd, char *path, int parent)
{
int wd = inotify_add_watch(inotify_fd, path, WATCH_MASK);
if (wd < 0) {
log_print(LOG_ERROR, "inotify_add_watch('%s')", path);
return -1;
}
if (watch_arr[wd].path != NULL) {
log_print(LOG_DEBUG, "add_watch(): removing old data: '%s' = %d",
watch_arr[wd].path, wd);
watch_arr[wd].parent = -1;
free(watch_arr[wd].path);
}
watch_arr[wd].parent = parent;
watch_arr[wd].path = strdup(path);
log_print(LOG_DEBUG, "add_watch('%s') = %d", path, wd);
return wd;
}
/*
* removes a watch, and all childrens!
* - updates watch_arr info
*
* returns -1 on failure
*/
static int remove_watch_recursive(int inotify_fd, int wd)
{
log_print(LOG_DEBUG, "remove_watch('%s')", watch_arr[wd].path);
int i;
for (i = 0; i < MAX_WATCHES; i++)
if (watch_arr[i].parent == wd)
remove_watch_recursive(inotify_fd, i);
int ret = inotify_rm_watch(inotify_fd, wd);
if (ret < 0)
log_print(LOG_ERROR, "inotify_rm_watch('%s')", watch_arr[wd].path);
watch_arr[wd].parent = -1;
free(watch_arr[wd].path);
watch_arr[wd].path = NULL;
return ret;
}
static int add_watch_recursive_real(int inotify_fd, char *path, int parent)
{
struct stat statbuf;
if (stat(path, &statbuf) == -1) {
log_print(LOG_ERROR, "add_watch_recursive_real(): stat('%s')", path);
return 0;
} else if (!S_ISDIR (statbuf.st_mode)) {
return 0;
}
int wd = add_watch(inotify_fd, path, parent);
if (wd < 0)
return 0;
int watches = 1;
DIR *dp = opendir(path);
if (dp == NULL) {
log_print(LOG_ERROR, "add_watch_recursive_real(): opendir('%s')", path);
} else {
char *end = path + strlen(path);
struct dirent *dentry;
while ((dentry = readdir(dp)) != NULL) {
if (!strcmp(dentry->d_name, "."))
continue;
if (!strcmp(dentry->d_name, ".."))
continue;
*end = '/';
strcpy(end +1, dentry->d_name);
watches += add_watch_recursive_real(inotify_fd, path, wd);
}
closedir(dp);
*end = '\0';
}
return watches;
}
static char * prepare_path(int parent, char *name)
{
char *tmppath = malloc(PATH_MAX);
if (tmppath == NULL) {
log_print(LOG_ERROR, "add_recursive_watch(): out of memory");
return 0;
}
if (parent != -1) {
char *tmp = tmppath + strlen(watch_arr[parent].path);
strcpy(tmppath, watch_arr[parent].path);
*tmp++ = '/';
strcpy(tmp, name);
} else {
strcpy(tmppath, name);
}
return tmppath;
}
static int find_child_by_name(int parent, char *name)
{
char *path = prepare_path(parent, name);
int i;
for (i = 0; i < MAX_WATCHES; i++) {
if (watch_arr[i].parent == parent && !strcmp(watch_arr[i].path, path)) {
free(path);
return i;
}
}
log_print(LOG_ERROR, "find_child_by_name: '%s' not found", path);
free(path);
return -1;
}
int add_watch_recursive(int fd, char *name)
{
char *tmppath = prepare_path(-1, name);
int num = add_watch_recursive_real(fd, tmppath, -1);
free(tmppath);
return num;
}
static char * mask_to_str(int mask)
{
char *retval = malloc(256);
*retval = '\0';
if (mask & IN_ACCESS)
strcat(retval, "IN_ACCESS ");
if (mask & IN_MODIFY)
strcat(retval, "IN_MODIFY ");
if (mask & IN_ATTRIB)
strcat(retval, "IN_ATTRIB ");
if (mask & IN_CLOSE_WRITE)
strcat(retval, "IN_CLOSE_WRITE ");
if (mask & IN_CLOSE_NOWRITE)
strcat(retval, "IN_CLOSE_NOWRITE ");
if (mask & IN_OPEN)
strcat(retval, "IN_OPEN ");
if (mask & IN_MOVED_FROM)
strcat(retval, "IN_MOVED_FROM ");
if (mask & IN_MOVED_TO)
strcat(retval, "IN_MOVED_TO ");
if (mask & IN_CREATE)
strcat(retval, "IN_CREATE ");
if (mask & IN_DELETE)
strcat(retval, "IN_DELETE ");
if (mask & IN_DELETE_SELF)
strcat(retval, "IN_DELETE_SELF ");
if (mask & IN_MOVE_SELF)
strcat(retval, "IN_MOVE_SELF ");
if (mask & IN_UNMOUNT)
strcat(retval, "IN_UNMOUNT ");
if (mask & IN_Q_OVERFLOW)
strcat(retval, "IN_Q_OVERFLOW ");
if (mask & IN_IGNORED)
strcat(retval, "IN_IGNORED ");
if (mask & IN_ISDIR)
strcat(retval, "IN_ISDIR ");
if (mask & IN_ONESHOT)
strcat(retval, "IN_ONESHOT ");
return retval;
}
int watch_callback(int fd, void *privdata)
{
unsigned int size;
int i = ioctl(fd, FIONREAD, &size);
if (i < 0) {
perror ("ioctl()");
return -1;
}
char *buf = malloc(size);
if (buf == NULL) {
perror("malloc()");
return -1;
}
int len, j = 0;
len = read(fd, buf, size);
while (j < len) {
struct inotify_event *event = (struct inotify_event *) &buf[j];
if (event->len)
log_print(LOG_INFO, "wd=%03d mask=%08X cookie=%08X name=%s/%s %s",
event->wd, event->mask, event->cookie, watch_arr[event->wd].path, event->name,
mask_to_str(event->mask));
else
log_print(LOG_INFO, "wd=%03d mask=%08X cookie=%08X (name=%s) %s",
event->wd, event->mask, event->cookie, watch_arr[event->wd].path,
mask_to_str(event->mask));
/* new directory created -> watch it */
if ((event->mask & (IN_CREATE | IN_ISDIR)) == (IN_CREATE | IN_ISDIR)) {
char *tmp = prepare_path(event->wd, event->name);
add_watch_recursive_real(fd, tmp, event->wd);
free(tmp);
}
/* directory removed -> remove watch info (the watch was removed by the kernel) */
if (event->mask & IN_IGNORED) {
if (watch_arr[event->wd].path != NULL) {
log_print(LOG_DEBUG, "kernel removed watch ('%s')", watch_arr[event->wd].path);
watch_arr[event->wd].parent = -1;
free(watch_arr[event->wd].path);
watch_arr[event->wd].path = NULL;
}
}
/* directory moved away -> find child by name-serach, then remove all his children rekursive */
if ((event->mask & (IN_MOVED_FROM | IN_ISDIR)) == (IN_MOVED_FROM | IN_ISDIR)) {
int wd = find_child_by_name(event->wd, event->name);
remove_watch_recursive(fd, wd);
}
/* directory moved to us -> add watches */
if ((event->mask & (IN_MOVED_TO | IN_ISDIR)) == (IN_MOVED_TO | IN_ISDIR)) {
char *tmp = prepare_path(event->wd, event->name);
add_watch_recursive_real(fd, tmp, event->wd);
free(tmp);
}
j += sizeof(struct inotify_event) + event->len;
}
free(buf);
return 0;
}
int inotify_open()
{
int fd = inotify_init();
if (fd < 0)
log_print(LOG_ERROR, "inotify_open()");
if (watch_arr == NULL) {
watch_arr = malloc(MAX_WATCHES * sizeof(struct watch_entry));
if (watch_arr == NULL) {
log_print(LOG_ERROR, "inotify_open(): out of memory");
return 0;
}
int i;
for (i = 0; i < MAX_WATCHES; i++) {
watch_arr[i].parent = -1;
watch_arr[i].path = NULL;
}
}
return fd;
}

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#ifndef _INOTIFY_H_
#define _INOTIFY_H_
int add_watch_recursive(int fd, char *path);
int watch_callback(int fd, void *privdata);
int inotify_open();
#endif /* _INOTIFY_H_ */

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/***************************************************************************
* Copyright (C) 10/2006 by Olaf Rempel *
* razzor@kopf-tisch.de *
* *
* 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 2 of the License, 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; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include "logging.h"
#include "inotify.h"
#include "event.h"
int main(int argc, char *argv[])
{
int fd = inotify_open();
int num = add_watch_recursive(fd, "/tmp");
log_print(LOG_INFO, "%d watches added\n", num);
event_add_readfd(fd, &watch_callback, NULL);
event_loop();
close(fd);
return 0;
}

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#ifndef _LIST_H_
#define _LIST_H_
/*
* stolen from linux kernel 2.6.11 (http://kernel.org/)
* linux/include/linux/stddef.h (offsetoff)
* linux/include/linux/kernel.h (container_of)
* linux/include/linux/list.h (*list*)
* linux/include/linux/netfilter_ipv4/listhelp.h (LIST_FIND)
*
* modified by Olaf Rempel <razzor@kopf-tisch.de>
*/
#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
#define container_of(ptr, type, member) ({ \
const typeof( ((type *)0)->member ) *__mptr = (ptr); \
(type *)( (char *)__mptr - offsetof(type,member) );})
struct list_head {
struct list_head *next, *prev;
};
#define LIST_HEAD_INIT(name) { &(name), &(name) }
#define LIST_HEAD(name) \
struct list_head name = LIST_HEAD_INIT(name)
#define INIT_LIST_HEAD(ptr) do { \
(ptr)->next = (ptr); (ptr)->prev = (ptr); \
} while (0)
/*
* Insert a new entry between two known consecutive entries.
*
* This is only for internal list manipulation where we know
* the prev/next entries already!
*/
static inline void __list_add(struct list_head *new,
struct list_head *prev,
struct list_head *next)
{
next->prev = new;
new->next = next;
new->prev = prev;
prev->next = new;
}
/*
* list_add - add a new entry
* @new: new entry to be added
* @head: list head to add it after
*
* Insert a new entry after the specified head.
* This is good for implementing stacks.
*/
static inline void list_add(struct list_head *new, struct list_head *head)
{
__list_add(new, head, head->next);
}
/*
* list_add_tail - add a new entry
* @new: new entry to be added
* @head: list head to add it before
*
* Insert a new entry before the specified head.
* This is useful for implementing queues.
*/
static inline void list_add_tail(struct list_head *new, struct list_head *head)
{
__list_add(new, head->prev, head);
}
/*
* Delete a list entry by making the prev/next entries
* point to each other.
*
* This is only for internal list manipulation where we know
* the prev/next entries already!
*/
static inline void __list_del(struct list_head * prev, struct list_head * next)
{
next->prev = prev;
prev->next = next;
}
/*
* list_del - deletes entry from list.
* @entry: the element to delete from the list.
* Note: list_empty on entry does not return true after this, the entry is
* in an undefined state.
*/
static inline void list_del(struct list_head *entry)
{
__list_del(entry->prev, entry->next);
entry->next = NULL;
entry->prev = NULL;
}
/*
* list_del_init - deletes entry from list and reinitialize it.
* entry: the element to delete from the list.
*/
static inline void list_del_init(struct list_head *entry)
{
__list_del(entry->prev, entry->next);
INIT_LIST_HEAD(entry);
}
/*
* list_move - delete from one list and add as another's head
* @list: the entry to move
* @head: the head that will precede our entry
*/
static inline void list_move(struct list_head *list, struct list_head *head)
{
__list_del(list->prev, list->next);
list_add(list, head);
}
/*
* list_move_tail - delete from one list and add as another's tail
* @list: the entry to move
* @head: the head that will follow our entry
*/
static inline void list_move_tail(struct list_head *list,
struct list_head *head)
{
__list_del(list->prev, list->next);
list_add_tail(list, head);
}
/*
* list_empty - tests whether a list is empty
* @head: the list to test.
*/
static inline int list_empty(const struct list_head *head)
{
return head->next == head;
}
static inline void __list_splice(struct list_head *list,
struct list_head *head)
{
struct list_head *first = list->next;
struct list_head *last = list->prev;
struct list_head *at = head->next;
first->prev = head;
head->next = first;
last->next = at;
at->prev = last;
}
/*
* list_splice - join two lists
* @list: the new list to add.
* @head: the place to add it in the first list.
*/
static inline void list_splice(struct list_head *list, struct list_head *head)
{
if (!list_empty(list))
__list_splice(list, head);
}
/*
* list_splice_init - join two lists and reinitialise the emptied list.
* @list: the new list to add.
* @head: the place to add it in the first list.
*
* The list at @list is reinitialised
*/
static inline void list_splice_init(struct list_head *list,
struct list_head *head)
{
if (!list_empty(list)) {
__list_splice(list, head);
INIT_LIST_HEAD(list);
}
}
/*
* list_entry - get the struct for this entry
* @ptr: the &struct list_head pointer.
* @type: the type of the struct this is embedded in.
* @member: the name of the list_struct within the struct.
*/
#define list_entry(ptr, type, member) \
container_of(ptr, type, member)
/*
* list_for_each - iterate over a list
* @pos: the &struct list_head to use as a loop counter.
* @head: the head for your list.
*/
#define list_for_each(pos, head) \
for (pos = (head)->next; pos != (head); pos = pos->next)
/*
* list_for_each_prev - iterate over a list backwards
* @pos: the &struct list_head to use as a loop counter.
* @head: the head for your list.
*/
#define list_for_each_prev(pos, head) \
for (pos = (head)->prev; pos != (head); pos = pos->prev)
/*
* list_for_each_safe - iterate over a list safe against removal of list entry
* @pos: the &struct list_head to use as a loop counter.
* @n: another &struct list_head to use as temporary storage
* @head: the head for your list.
*/
#define list_for_each_safe(pos, n, head) \
for (pos = (head)->next, n = pos->next; pos != (head); \
pos = n, n = pos->next)
/*
* list_for_each_entry - iterate over list of given type
* @pos: the type * to use as a loop counter.
* @head: the head for your list.
* @member: the name of the list_struct within the struct.
*/
#define list_for_each_entry(pos, head, member) \
for (pos = list_entry((head)->next, typeof(*pos), member); \
&pos->member != (head); \
pos = list_entry(pos->member.next, typeof(*pos), member))
/*
* list_for_each_entry_reverse - iterate backwards over list of given type.
* @pos: the type * to use as a loop counter.
* @head: the head for your list.
* @member: the name of the list_struct within the struct.
*/
#define list_for_each_entry_reverse(pos, head, member) \
for (pos = list_entry((head)->prev, typeof(*pos), member); \
&pos->member != (head); \
pos = list_entry(pos->member.prev, typeof(*pos), member))
/*
* list_for_each_entry_safe - iterate over list of given type safe against removal of list entry
* @pos: the type * to use as a loop counter.
* @n: another type * to use as temporary storage
* @head: the head for your list.
* @member: the name of the list_struct within the struct.
*/
#define list_for_each_entry_safe(pos, n, head, member) \
for (pos = list_entry((head)->next, typeof(*pos), member), \
n = list_entry(pos->member.next, typeof(*pos), member); \
&pos->member != (head); \
pos = n, n = list_entry(n->member.next, typeof(*n), member))
/* Return pointer to first true entry, if any, or NULL. A macro
required to allow inlining of cmpfn. */
#define LIST_FIND(head, cmpfn, type, args...) \
({ \
const struct list_head *__i, *__j = NULL; \
\
list_for_each(__i, (head)) \
if (cmpfn((const type)__i , ## args)) { \
__j = __i; \
break; \
} \
(type)__j; \
})
#endif /* _LIST_H_ */

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/***************************************************************************
* Copyright (C) 06/2006 by Olaf Rempel *
* razzor@kopf-tisch.de *
* *
* 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 2 of the License, 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; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
***************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <stdarg.h>
#include <errno.h>
#include <string.h>
#include "logging.h"
#define BUFSIZE 8192
static FILE *log_fd = NULL;
static char *buffer = NULL;
void log_print(int prio, const char *fmt, ...)
{
va_list az;
int len;
if (buffer == NULL) {
buffer = malloc(BUFSIZE);
if (buffer == NULL) {
fprintf(stderr, "log_print: out of memory\nBailing out!\n");
exit(-1);
}
}
va_start(az, fmt);
len = vsnprintf(buffer, BUFSIZE, fmt, az);
va_end(az);
if (len < 0 || len >= BUFSIZE) {
log_print(LOG_ERROR, "log_print: arguments too long");
errno = 0;
return;
}
if (errno) {
strncpy(buffer + len, ": ", BUFSIZE - len);
len += 2;
strncpy(buffer + len, strerror(errno), BUFSIZE - len);
}
if (log_fd) {
char tbuf[64];
time_t tzgr;
time(&tzgr);
strftime(tbuf, sizeof(tbuf), "%b %d %H:%M:%S :", localtime(&tzgr));
fprintf(log_fd, "%s %s\n", tbuf, buffer);
fflush(log_fd);
} else {
fprintf(stderr, "%s\n", buffer);
}
errno = 0;
}
static void log_close(void)
{
if (buffer)
free(buffer);
fclose(log_fd);
}
int log_init(char *logfile)
{
log_fd = fopen(logfile, "a");
if (log_fd == NULL) {
log_print(LOG_ERROR, "log_open('%s'): %s", logfile);
return 0;
}
if (atexit(log_close) != 0) {
log_print(LOG_ERROR, "log_open(): atexit()");
return 0;
}
log_print(LOG_EVERYTIME, "==========================");
return 1;
}

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#ifndef _LOGGING_H_
#define _LOGGING_H_
#define LOG_DEBUG 5
#define LOG_INFO 4
#define LOG_NOTICE 3
#define LOG_WARN 2
#define LOG_ERROR 1
#define LOG_CRIT 0
#define LOG_EVERYTIME 0
int log_init(char *logfile);
void log_print(int prio, const char *fmt, ... );
#endif /* _LOGGING_H_ */

87
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#ifndef _SYS_INOTIFY_H
#define _SYS_INOTIFY_H 1
#include <stdint.h>
/* Structure describing an inotify event. */
struct inotify_event
{
int wd; /* Watch descriptor. */
uint32_t mask; /* Watch mask. */
uint32_t cookie; /* Cookie to synchronize two events. */
uint32_t len; /* Length (including NULs) of name. */
char name __flexarr; /* Name. */
};
/* the following are legal, implemented events that user-space can watch for */
#define IN_ACCESS 0x00000001 /* File was accessed */
#define IN_MODIFY 0x00000002 /* File was modified */
#define IN_ATTRIB 0x00000004 /* Metadata changed */
#define IN_CLOSE_WRITE 0x00000008 /* Writtable file was closed */
#define IN_CLOSE_NOWRITE 0x00000010 /* Unwrittable file closed */
#define IN_OPEN 0x00000020 /* File was opened */
#define IN_MOVED_FROM 0x00000040 /* File was moved from X */
#define IN_MOVED_TO 0x00000080 /* File was moved to Y */
#define IN_CREATE 0x00000100 /* Subfile was created */
#define IN_DELETE 0x00000200 /* Subfile was deleted */
#define IN_DELETE_SELF 0x00000400 /* Self was deleted */
#define IN_MOVE_SELF 0x00000800 /* Self was moved */
/* the following are legal events. they are sent as needed to any watch */
#define IN_UNMOUNT 0x00002000 /* Backing fs was unmounted */
#define IN_Q_OVERFLOW 0x00004000 /* Event queued overflowed */
#define IN_IGNORED 0x00008000 /* File was ignored */
/* helper events */
#define IN_CLOSE (IN_CLOSE_WRITE | IN_CLOSE_NOWRITE) /* close */
#define IN_MOVE (IN_MOVED_FROM | IN_MOVED_TO) /* moves */
/* special flags */
#define IN_ONLYDIR 0x01000000 /* only watch the path if it is a directory */
#define IN_DONT_FOLLOW 0x02000000 /* don't follow a sym link */
#define IN_MASK_ADD 0x20000000 /* add to the mask of an already existing watch */
#define IN_ISDIR 0x40000000 /* event occurred against dir */
#define IN_ONESHOT 0x80000000 /* only send event once */
/*
* All of the events - we build the list by hand so that we can add flags in
* the future and not break backward compatibility. Apps will get only the
* events that they originally wanted. Be sure to add new events here!
*/
#define IN_ALL_EVENTS (IN_ACCESS | IN_MODIFY | IN_ATTRIB | IN_CLOSE_WRITE | \
IN_CLOSE_NOWRITE | IN_OPEN | IN_MOVED_FROM | \
IN_MOVED_TO | IN_DELETE | IN_CREATE | IN_DELETE_SELF | \
IN_MOVE_SELF)
/* needed until Inotify! syscalls reach glibc */
#include <sys/syscall.h>
#ifndef __NR_inotify_init
#if defined(__i386__)
# define __NR_inotify_init 291
# define __NR_inotify_add_watch 292
# define __NR_inotify_rm_watch 293
#elif defined(__x86_64__)
# define __NR_inotify_init 253
# define __NR_inotify_add_watch 254
# define __NR_inotify_rm_watch 255
#else
#warning "inotify unsupported on this architecture!"
#endif
#endif /* __NR_inotify_init */
static inline int inotify_init(void)
{
return syscall(__NR_inotify_init);
}
static inline int inotify_add_watch(int fd, const char *name, uint32_t mask)
{
return syscall(__NR_inotify_add_watch, fd, name, mask);
}
static inline int inotify_rm_watch(int fd, uint32_t wd)
{
return syscall(__NR_inotify_rm_watch, fd, wd);
}
#endif /* sys/inotify.h */