"bunty " <bunty123_4@rediffmail.com> writes: > hello, > 1) how kernel write to /proc entry? while studying kernel source i > found that there is no open/read/write/close file functions. what i > found is that sprintf function that writes to /proc entry. can > anyone please explain it? Hi. Have you seen the Linux Kernel Procfs Guide or the example procfs C code in the Documentation directory of the Linux kernel? There was some good online info that I used ... some online journal in the .net domain. I even subscribed, but I can't remember the name of the site. One conceptual thing: with regard to /proc, the kernel performs services on behalf of userspace. Inside the kernel, you register your code as a handler for something the user can request by doing I/O on a virtual file inside /proc. > 2)what is the use of read_write.c file in fs directory of kernel source? > the file contains sys_read, sys_write. why there is no function that > will read a user space file and write to it. i found few questions > asked on linux-kernel as well as kernelnewbies but there is no one > able to answer it? It seems like most of the time when people are looking for user-level stuff inside the kernel it is based on some misunderstandings about what the role of the kernel is. That's why in the archives you'll find people saying, "That's a bad idea, but here's how you can do it if you really must." -- --Ed L Cashin | PGP public key: ecashin@uga.edu | http://noserose.net/e/pgp/ -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
