Adding a New System Call into the Linux Kernel 2.6
Loading ...最近在学习关于Linux的Kernel以及modules方面的内容，今天刚试验成功了一次，特此写出具体过程，分享一下我的经验。
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Stage 1: To modify the kernel to add our own system call
==============================================
1. Download the Linux kernel 2.6.18 from kernel.org to /usr/src/
- cd /usr/src/
- wget http://www.kernel.org/pub/linux/kernel/v2.6/linux-2.6.18.tar.gz
2. Un-compress and un-archive
- tar zxvf linux-2.6.18.tar.gz
3. Link it to directory linux, from this point on, there a several files that needs to be modified from and added to the kernel source tree.
- ln -s linux-2.6.18 linux
4. Edit file
/usr/src/linux/arch/i386/kernel/syscall_table.S
Add
.long sys_mysyscall
after the last line of the file.
5. Edit file
/usr/src/linux/arch/i386/kernel/Makefile
Add
obj-y += mysyscall.o
6. Create a new file call mysyscall.c under
/usr/src/linux/arch/i386/kernel/
directory.
Type the following into the file:
- #include #include asmlinkage int sys_mysyscall(void)
- {
- printk("This is the my new system call build in the kernel!\n");
- return 0;
- }
7. Edit file
/usr/src/linux/include/asm-i386/unistd.h
Add
#define __NR_mysyscall 318
after
#define __NR_move_pages 317
Modify
#define __NR_syscalls 318
to
#define __NR_syscalls 319
8. At this point, you can start building your new kernel.
- make menuconfig && make && make modules_install && make install
9.After a successful build, reboot the machine and boot into the newly built kernel.
===========================
Stage 2: To test the new system call
===========================
10.Create a new file call testsyscall.c in your directory.
Type the following into the file:
- #include #define __NR_mysyscall 318
- _syscall0(long, mysyscall);
- int main ()
- {
- mysyscall();
- return 0;
- }
11.Compile the above testsyscall.c source code with :
- gcc -Wall testsyscall.c -o testsyscall.o
12.If you arrive here without problems, you can now test the newly created system call just type
- ./testsyscall.o
13. To check if it works, you can use:
- dmesg tail -n 5
you will see there is “This is the my new system call build in the kernel!\n” in the last line.
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引用: http://www.i4wei.com/2006/12/1/
