Update Post “2023-11-26-kernel-creation-of-new-process”

content/posts/2023-11-26-kernel-creation-of-new-process.md

@@ -1,7 +1,7 @@
 ---
-title: Kernel, creation of new process
+title: Kernel, Process creation
 date: 2023-11-26T07:44:51.449Z
-slug: kernel-new-process-creation
+slug: kernel-process-creation
 description: "Deep dive Linux Kernel #3"
 ---
 ```c
@@ -41,6 +41,8 @@ static int init(void * unused)
 }
 ```
 
-At `open("/dev/console") is opens fd 0, and with two `dup(0)`, fd 0, 1, 2 as stdin, stdout, stderr opens. When `execve()` or `fork()` happens, it simply copies calling process's `task_struct` as process context, so all file descriptors are also passed down.
+In this `init/main.c`, after basic kernel initialization things, `open("/dev/console")` and two `dup(0)` opens three file descriptor 0, 1, 2 as stdin, stdout, stderr. Later when `execve()` or `fork()` happens, it simply copies calling process's `task_struct` as process context, so all file descriptors are also passed down as-is.
 
-All processes' file descriptor 0, 1, 2 are all originates to `init`'s file descriptor, set up like above.
+All processes' file descriptor 0, 1, 2 originates to `init`'s file descriptor.
+
+If calling process opens PTY or TTY, which is common when we opens new terminal to run a process, it is also passed down to exec/forked process.