I need to lock a file, which will be accessed by a Java program (multi-thread). The content of the file is written by a C programme. I try the file lock (similar to the book - Advanced Linux Programming). It doesn't work because when reading the file and paring it, it returned with a error, saying no content inside the file (but `cat file_name` I can see the content exactly there). How can I lock a file that can prevent other processes (the Java programme) access the file before the writing process (the C programme) finishes its jobs? Or what to do to prevent such problem occurs?
The code snippet of locking file in C I write is as follow:
Code:
...
memset(&lock, 0, sizeof(lock));
lock.l_type = F_WRLCK;
fcntl(fd, F_SETLK, &lock);
//prepare content
...
/* unlocking file */
lock.l_type = F_UNLCK;
fcntl(fd, F_SETLK, &lock);
...
Thanks in advice,
