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File notify question.
Posted on: 2014/2/12 16:33   #1
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I'm looking at the fs_notify_test.c example, and it does notify about files in sub directory's, but is possible to make it notify about changes in sub directory’s also?

And also it be nice if notified about deleting and creating directories.
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Re: File notify question.
Posted on: 2014/2/16 12:17   #2
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@LiveForIt

This is important, the program I'm writing depends on best possible notification service, so if anyone can help.

I need to be notified when directory’s are created, when they are deleted, when files are changed or created or replaced.

I need to know if there is changes in sub directory’s of directory I'm monitoring.
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Re: File notify question.
Posted on: 2014/2/16 17:36   #3
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@LiveForIt
I just did some testing with the waitnotify command. If I wait on a directory, any activity in that directory (files, new sub-directories, deleted directories etc.) causes the wait to end. The waitnotify command at OS4Depot includes the source code which may be of some help.
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Re: File notify question.
Posted on: 2014/2/16 18:04   #4
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@xenic

Excellent, I have a look.

Thanks.


Edited by LiveForIt on 2014/2/17 11:06:38
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Re: File notify question.
Posted on: 2014/2/16 21:43   #5
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@LiveForIt

Don't forget that depending on the filesystem (I believe), it may differ whether activity in a subdir of a subdir will be visible/notified "two layers above".

You should make sure you test the features you need in a situation with multiple layers of subdirectories.

Best regards,

Niels
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Re: File notify question.
Posted on: 2014/2/16 22:10   #6
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@nbache

Quote:

Don't forget that depending on the filesystem (I believe), it may differ whether activity in a subdir of a subdir will be visible/notified "two layers above".


If ADO_DOSMethodOnly is set to TRUE notifications will work the same no matter what the underlying filesystem is (see autodoc for more details).
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Re: File notify question.
Posted on: 2014/2/17 7:23   #7
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@xenic

The example does not inform me what has changed, so it can't be used, but thanks anyway.
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Re: File notify question.
Posted on: 2014/2/17 10:20   #8
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This is my test code for NotifyMessage, but NotifyMessage does not give any useful info about anything...

Class and Code is always the same values, and the mssage name is always NULL.

I don't get what this is for :-/

#include <exec/types.h>
#include <exec/types.h>
#include <exec/memory.h>
#include <dos/dos.h>
#include <dos/notify.h>
#include <stdio.h>
#include <stdarg.h>
#include <proto/exec.h>
#include <proto/dos.h>

struct NotifyRequest *set_notify(char *fname, struct MsgPort *port)
{
    struct NotifyRequest *nr;

#if 1
    if (nr = AllocVec(sizeof(struct NotifyRequest), MEMF_CLEAR ) )
    {
        nr->nr_Name                = fname;
        nr->nr_Flags                = NRF_SEND_MESSAGE | NRF_WAIT_REPLY;
        nr->nr_stuff.nr_Msg.nr_Port    = port;
    }
#else
    nr= AllocSysObjectTags( DOS_NOTIFYREQUEST, 
            ADO_NotifyName, fname,
            ADO_NotifyMethod, NRF_SEND_MESSAGE,
            ADO_NotifyPort, port,
//            ADO_NotifyWaitReply, TRUE,
            TAG_END ) ;
#endif
    return nr;
}

int main( int argc , char **args)
{
    ULONG exitsig = SIGBREAKF_CTRL_E;
    ULONG signals, sigmask = exitsig;
    int rv = RETURN_OK;

    struct NotifyRequest *nr = NULL;
    struct MsgPort    *port;
    struct NotifyMessage *msg;

    if (argc<2) 
    {
        printf("Give a arrrrg... :-/");
        return RETURN_FAIL;
    }

    port = (struct MsgPort *) AllocSysObjectTags( ASOT_PORT, TAG_END );
    if (!port)     return RETURN_FAIL;

    if (nr= set_notify( args[1] , port ) )
    {
        signals= (1L << port -> mp_SigBit);
        sigmask |= signals;
    }

    printf("-Wait messages-n");

    StartNotify(nr);

    if(rv == RETURN_OK)
    {
        ULONG sigset ;
        char *c;

        for(;;)
        {
            sigset = Wait(sigmask);

            if (msg = (struct NotifyMessage *) GetMsg(port))
            {
                printf("message recived %x, %xn", msg -> nm_Class, msg -> nm_Code );

                if (msg -> nm_ExecMessage.mn_Node.ln_Name) printf("%sn",msg -> nm_ExecMessage.mn_Node.ln_Name);

                    printf("nm_DoNotTouch %08xn", msg -> nm_DoNotTouch);
                    printf("nm_DoNotTouch2 %08xn", msg -> nm_DoNotTouch2);  
                
                c = (char *) msg -> nm_DoNotTouch2;
                printf("%c,%cn",*c,*(c+1),*(c+2));

                    printf("nr_DosPrivate %08xn", msg -> nm_NReq -> nr_DosPrivate);
                    printf("nr_MsgCount %dn", msg -> nm_NReq -> nr_MsgCount);  

                ReplyMsg( (struct Message *) msg);
            }

            if (sigset & exitsig ) break;
        }    
    }
    
    printf("-Close-n");

    if (nr)
    {
            EndNotify(nr);

        if (port) FreeSysObject( ASOT_PORT, (APTR) port );
        port = NULL;
    }

    return rv;
}

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Re: File notify question.
Posted on: 2014/2/17 10:45   #9
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@LiveForIt

Why do you insist on using message notification type when hook notification type gives more information?

Quote:

struct NotifyHookMsg
{
int32 nhm_Size; /* Size of data structure */
int32 nhm_Action; /* What happened (see below) */
STRPTR nhm_Name; /* The name of the object */
};


Also if you want consistent behavior between filesystems it's recommended to use ADO_DOSMethodOnly that I mentioned before.
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Re: File notify question.
Posted on: 2014/2/17 11:04   #10
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@salass00

It was the first thing I tried.

Because it did not provide information about sub directory’s.

Signaling and Messaging work on subdirectories.

Also I don't know what I'm doing wrong whit AllocSysObjectTags,because its only works when setting up the struct Notify manually.
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Re: File notify question.
Posted on: 2014/2/17 12:59   #11
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@salass00

Some thing is not right whit AllocSysObjectsTags().

nr= AllocSysObjectTags( DOS_NOTIFYREQUEST, 
            ADO_NotifyName, fname,
            ADO_NotifyMethod, NRF_CALL_HOOK,
            ADO_DOSMethodOnly, TRUE,
            ADO_NotifyHook, hook,
            TAG_END ) ;

    printf("Name: %sn", nr->nr_Name);
    printf("Flag: %dn",nr->nr_Flags);
    printf("HOOK: %08Xn", nr->nr_stuff.nr_CallHook.nr_Hook);


result:

Name: (null)
Flag: 0
HOOK: 5DDCEAA4

if (nr = AllocVec(sizeof(struct NotifyRequest), MEMF_CLEAR ) )
    {
        nr->nr_Name                = fname;
        nr->nr_Flags                = NRF_CALL_HOOK;
        nr->nr_stuff.nr_CallHook.nr_Hook = hook;
    }

    printf("Name: %sn", nr->nr_Name);
    printf("Flag: %dn",nr->nr_Flags);
    printf("HOOK: %08Xn", nr->nr_stuff.nr_CallHook.nr_Hook);


result:

Name: ram:
Flag: 32
HOOK: 5C673CD4
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Re: File notify question.
Posted on: 2014/2/17 13:07   #12
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@LiveForIt

Quote:
Some thing is not right whit AllocSysObjectsTags().


Yeah, you are using the wrong function. AllocDosObjectTags() is what you're looking for.

(edit: changed AllocDosObject() to AllocDosObjectTags()
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Re: File notify question.
Posted on: 2014/2/17 13:37   #13
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@Gazelle

Thanks that worked.
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Re: File notify question.
Posted on: 2014/2/17 17:00   #14
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For the future in case you didn't already know :

AllocSysObjectTags()/FreeSysObject() is for ASOT_#? objects

AllocDosObjectTags()/FreeDosObject() is for DOS_#? objects
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Re: File notify question.
Posted on: 2014/2/17 17:22   #15
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@salass00

OK thanks, but this API has clearly some limitations.

Anyway, two things Notification API, needs to support:

* Rename: (Do it the correct way, not say the file is deleted when they are not deleted.)

* Support for Sub directory’s.
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Re: File notify question.
Posted on: 6/18 1:48   #16
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@salass00

I needed to update my notification module to handle multiple files being watched. So it requires the hook mode since can't have over 15 signals.

I have it all working, but one thing I don't like that needs to be updated:


notifyMultiHookFunc(struct Hook *hook,APTR resv UNUSED,struct NotifyHookMsg *msg)

msg->nhm_Name only gives me the FilePart of the path I originally specified. Seems like no big deal, but what if I have multiple files of the same name but from different drawers being watched? I need to know specifically which one it is. I need the entire path that I specified to watch.

nhm_Path could be added for entire path.


But for now, what do I do?
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Re: File notify question.
Posted on: 6/18 8:38   #17
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@mritter0

Use a separate hook for each notification you setup. The hooks will call the same function but you can use the hook data to provide that function with the extra data you need.
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Re: File notify question.
Posted on: 6/18 20:17   #18
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@broadblues

Thanks for the idea. That is what I did. Hopefully the full path will be added so I can use 1 global hook instead of multiple hooks.
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Re: File notify question.
Posted on: 6/18 20:29   #19
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@mritter0

Since you need to set the hook for each directory / file monitored seprate hooks is the correct way to go, to avoid race type conditions on more complex hook data.


But there is also the "DOSFileDirNotify.resource" which since version 53.81 can setup a global hook to monitor all notification activity. I use this for my activityMonitor application which before that needed to set 1000s of notifications up.

See SDK:Include/include_h/resources/filedirnotify.h
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