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Message: [QUOTE="Bedo Sandor, post: 4411614"] 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? [/QUOTE]