file locking

[Bedo Sandor]

Hi All,

There are 3 different file locking mechanisms in C:

flock
lockf
fcntl

I want to write a Ruby script, which shares files with
a C program using all of these lockings.

As I can see objects with the type File have an flock
method. This is the only one I can use. There is an
fcntl method, but I don't know how to use it. What
kind of parameters can I pass to fcntl? I want to
implement this code in Ruby for fcntl:

def lock_fcntl(fd)

# struct flock f_lock;

# memset(&f_lock, '\0', sizeof(f_lock));
# f_lock.l_type = F_WRLCK;
# f_lock.l_whence = SEEK_SET;
# f_lock.l_start = 0;
# f_lock.l_len = 0;
# fcntl(fd, F_SETLKW, &f_lock);

end

and I need a lockf-type method too:

def lock_lockf(fd)
# ???
end

Could you show me how to use fcntl, and how to
access lockf from Ruby?

 

[Josef 'Jupp' Schugt]

Saluton!

* Bedo Sandor; 2003-07-15, 12:46 UTC:

There are 3 different file locking mechanisms in C:

flock
lockf
fcntl

I want to write a Ruby script, which shares files with
a C program using all of these lockings.

Maybe 'filelock' is what you are looking for (at least it works fine
when sharing mbox files with mutt).

Gis,

Josef 'Jupp' Schugt

 

[Bermejo, Rodrigo]

have you checked it 'http://raa.ruby-lang.org/list.rhtml?name=filelock'
out

-r.

Hi All,

There are 3 different file locking mechanisms in C:

flock
lockf
fcntl

I want to write a Ruby script, which shares files with
a C program using all of these lockings.

As I can see objects with the type File have an flock
method. This is the only one I can use. There is an
fcntl method, but I don't know how to use it. What
kind of parameters can I pass to fcntl? I want to
implement this code in Ruby for fcntl:

def lock_fcntl(fd)

# struct flock f_lock;

# memset(&f_lock, '\0', sizeof(f_lock));
# f_lock.l_type = F_WRLCK;
# f_lock.l_whence = SEEK_SET;
# f_lock.l_start = 0;
# f_lock.l_len = 0;
# fcntl(fd, F_SETLKW, &f_lock);

end

and I need a lockf-type method too:

def lock_lockf(fd)
# ???
end

Could you show me how to use fcntl, and how to
access lockf from Ruby?

--
General Electric - CIAT
Advanced Engineering Center
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Rodrigo Bermejo
Information Technologies.
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Phone +52) 442-196-0644
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