hi, I am in a kernel module and I want to have the whole process name from a given pid. exactly: I want the line which is hold in /proc/PID/cmdline. The problem is that task_struct->comm[] is only 15 bytes long and doesn't handle if a program changes his argv[] manually or via setproctitle(3)... any ideas? :) ...
It's been a while since I worked on a Linux kernel module, and I seem to remember that there was a place to stash context in your open() open implementation that would be available in your other file_operations... For example, if I want to maintain some state associated with everyone that opens my device node, if either the inode structu...
Hi: I'm doing some Linux kernel development, and I'm trying to use Netbeans. Despite declared support for Make-based C projects, I cannot create a fully functional Netbeans project. This is despite compiling having Netbeans analyze a kernel binary that was compiled with full debugging information. Problems include: files are wrongl...
Hello everyone, I am using linux kernel version 2.6.26.8 and I need to use async_XXX (async_xor, async_memcpy etc) API. So I need to build the ASYNC_XXX modules with my kernel. But I can't see the config options related to ASYNC_XOR or ASYNC_MEMCPY etc through menuconfig or gconfig under Security Options. In gconfig if I select show al...
Hi, I was trying to compile the linux kernel, but getting some errors. While running the top Makefile i am getting the following errors :- CHK include/linux/version.h CHK include/linux/utsrelease.h SYMLINK include/asm -> include/asm-x86 HOSTCC scripts/selinux/mdp/mdp scripts/selinux/mdp/mdp.c:32:19: error: flask.h: No su...
Yeah I know ... Some people are sometimes hard to convince of what sounds natural to the rest of us, an I need your help right now SO community (or I'll go postal soon ..) One of my co-worker is convinced the linux kernel code is not re-entrant as he reads it somewhere last time he get insterested in it, likely 7 years ago. Probably its...
Can you show me some C code to detect a pendrive and retrieve the data present in it. I'm working on Linux. ...
Hi, I was trying to compile the Linux kernel. I am getting the following error:- "No rule to make target arch/x86/kernel/entry_32.o', needed by arch/x86/kernel/built-in.o'." Before this I configured the kernel(didn't do anything extra except the default options). configured the kernel using "make gconfig". The config was generated. I...
I would like to know not only user-side differences, but differences / common parts in Linux kernel implementation as well. ...
Hi all, I was wondering if anyone knew of a way to remotely debug the Linux kernel running under VMWare (and if so, if there's a way to do it in Windows since linux kind of scares me...). Both are x86. I know VMWare has support for this (I saw a post about remote debugging via gdb), but if there was a way to do it from Windows (i.e. Ecl...
I am trying to set the sys exit call to a variable by extern void *sys_call_table[]; real_sys_exit = sys_call_table[__NR_exit] however, when I try to make, the console gives me the error error: ‘__NR_exit’ undeclared (first use in this function) Any tips would be appreciated :) Thank you ...
I have a Linux System V IPC shared memory segment that is populated by one process and read by many others. All the processes use interface to the shared memory segment in the form of a class which takes care of looking up, attaching, and detaching to the segment as part of its constructor/destructor methods. The problem here is that...
Hi, I am writing an application which collects overall system I/O statistics. I was wondering whether the two counters for page-ins and page-outs, pgpgin pgpgout in /proc/vmstat include pages written to, and read from all disk-based block devices attached to the system. Please let me know, if you can! ...
What role do they play in the Operating system ? ...
I am a computer science engineering student and I've been programming on the .NET Framework for 2-3 years but I haven't used Linux. I thought, for my final year project, a Linux distro would be good. I was thinking of a few ways to implement it, when this crazy idea occurred to me: Can we implement the .NET Framework first on the Li...
I've noticed that the Linux kernel code uses bool, but I thought that bool was a C++ type. Is bool a standard C extension (e.g., ISO C90) or a GCC extension? ...
Is writing a code for implementing the thread library a part of kernel code ? Is the function implementation of pthread_create() et al a part of kernel ? ...
My question is about passing data from kernel to a user space program. I want to implement a system call "get_data(size, char *buff, char **meta_buf)". In this call, buff is allocated by user space program and its length is passed in the size argument. However, meta_buf is a variable length buffer that is allocated (in the user space pro...
The following line printed output as 4 whereas I was expecting 0. printk(KERN_INFO "size of spinlock_t %d\n", sizeof(spinlock_t)); I tried this on a system with single cpu. No debugging flags are enabled while building kernel like CONFIG_DEBUG_SPINLOCK or CONFIG_DEBUG_LOCK_ALLOC. According to kernel header files, it should be zero ...
Are the programs written on schedulers ,thread library , process management, memory management, et al called systems programs ? How are they different from the programs that implement functions like open() , printf() , scanf() , read() .. they have a prefix sys_open, sys_close, sys_read etc , right ? Is there any difference of hierarchy...