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.

1 files changed, 1 insertions, 0 deletions

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;