From 8e933fac9fd068343bb602f13175c8d70a6c5768 Mon Sep 17 00:00:00 2001
From: Jake Mannens <jake72360@gmail.com>
Date: Wed, 1 Aug 2018 02:27:57 +1000
Subject: Defined EOF as -1 in stdio.h.

Implemented the sprintf() library function in lib/stdio.c which uses the
vsprintf() function.

Implemented a very primative controlling TTY for each process. This is
achieved by a switch in the sys_puts system call which uses the 'ctty'
element of the process' task structure to determine an appropriate I/O
channel. A negative ctty value doesn't equate to any I/O channel
effectively disabling the process' output.

Added the sys_ctty system call which allows a process to set it's own
ctty value.

Removed the sys_rsputs system call. Output to serial is now performed by
the process first setting it's ctty value to 1, then invoking sys_puts.
---
 include/kernel/con.h   | 2 ++
 include/kernel/sched.h | 1 +
 include/kernel/sys.h   | 8 ++++----
 3 files changed, 7 insertions(+), 4 deletions(-)

(limited to 'include/kernel')

diff --git a/include/kernel/con.h b/include/kernel/con.h
index 9dd9dbe..d28daff 100644
--- a/include/kernel/con.h
+++ b/include/kernel/con.h
@@ -13,4 +13,6 @@ void con_clear(void);
 
 int printk(char*, ...);
 
+int rsputs(char*);
+
 #endif
diff --git a/include/kernel/sched.h b/include/kernel/sched.h
index 6b0488e..4d2aca0 100644
--- a/include/kernel/sched.h
+++ b/include/kernel/sched.h
@@ -50,6 +50,7 @@ struct task_struct {
   pid_t pid;
   int state;
   uint32_t signal;
+  int ctty;
   unsigned int alarm;
   void *sig_handlers[NRSIG];
   struct tss_struct tss;
diff --git a/include/kernel/sys.h b/include/kernel/sys.h
index ba2dc0c..32788b1 100644
--- a/include/kernel/sys.h
+++ b/include/kernel/sys.h
@@ -5,9 +5,9 @@ extern int sys_time(void);
 extern int sys_getpid(void);
 extern int sys_getpdir(void);
 extern int sys_signal(void);
-extern int sys_rsputs(void);
 extern int sys_alarm(void);
 extern int sys_pause(void);
+extern int sys_ctty(void);
 extern int sys_dummy(void);
 
 syscall_t call_table[256] = {
@@ -16,9 +16,9 @@ syscall_t call_table[256] = {
   [2] = &sys_getpid,
   [3] = &sys_getpdir,
   [4] = &sys_signal,
-  [5] = &sys_rsputs,
-  [6] = &sys_alarm,
-  [7] = &sys_pause,
+  [5] = &sys_alarm,
+  [6] = &sys_pause,
+  [7] = &sys_ctty,
   [8] = &sys_dummy,
   [9] = &sys_dummy,
   [10] = &sys_dummy,
-- 
cgit v1.3