the linux kernel internal · the linux kernel internal implementing a linux kernel system call...
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The Linux Kernel Internal The Linux Kernel InternalImplementing a Linux kernel system call
Ramin Farajpour Cami – Twitter : @MF4rr3ll
System Call
• Communicating with the Kernel .
• System calls provide a layer between the hardware and user-space processes
Select SYSCALL numbervoid *sys_call_table[NR_syscalls] = {
[0 ... NR_syscalls-1] = sys_ni_syscall,
#include <asm/unistd.h>
};
https://elixir.bootlin.com/linux/v3.14/source/arch/arc/kernel/sys.c#L13
Syscall table :
https://github.com/torvalds/linux/blob/v3.13/arch/x86/syscalls/syscall_64.tbl
https://github.com/torvalds/linux/blob/883c9ab9eb595f8542d01e55d29a346c8d96862e/arch/parisc/kernel/syscall_table.S
https://github.com/torvalds/linux/blob/6f0d349d922ba44e4348a17a78ea51b7135965b1/arch/sparc/kernel/systbls_32.S
Linux system call in C without a standard library
• http://the-linux-channel.the-toffee-project.org/index.php?page=5-tutorials-a-linux-system-call-in-c-without-a-standard-library&lang
Add SYSCALL in the linux kernel
• 1- download linux kernel : https://kernel.org
• 2- apt-get source linux