Linux kernel space and user space communication __linux

information interaction initiated by user space Write your own system call

Linux currently provides more than 200 standard system calls, and allows us to add our own system calls to implement the information interaction with the kernel. Writing Drivers

Read, write, IOCTL use file systems such as/proc to invoke user programs from kernel space using mmap information that is actively initiated by kernel space

The kernel starts the user program by Execve this system to invoke the prototype, at which time the system call takes place in the kernel space, while the general system call is in user space. using BRK system to export kernel data Use signal What is the difference between Linux kernel space and user space, how to interact, how to enter kernel space from user space 2.