Reorganized system call library; uses separate file per call now.

New configuration header file to include/ exclude functionality.
Extracted privileged features from struct proc and create new struct priv.
Renamed various system calls for readability.

kernel/system/do_fork.c

@@ -0,0 +1,62 @@
+/* The system call implemented in this file:
+ *   m_type:	SYS_FORK
+ *
+ * The parameters for this system call are:
+ *    m1_i1:	PR_PROC_NR	(child's process table slot)	
+ *    m1_i2:	PR_PPROC_NR	(parent, process that forked)	
+ *    m1_i3:	PR_PID	 	(child pid received from PM)
+ */
+
+#include "../system.h"
+#include <signal.h>
+#if (CHIP == INTEL)
+#include "../protect.h"
+#endif
+
+#if USE_FORK
+
+/*===========================================================================*
+ *				do_fork					     *
+ *===========================================================================*/
+PUBLIC int do_fork(m_ptr)
+register message *m_ptr;	/* pointer to request message */
+{
+/* Handle sys_fork().  PR_PPROC_NR has forked.  The child is PR_PROC_NR. */
+
+#if (CHIP == INTEL)
+  reg_t old_ldt_sel;
+#endif
+  register struct proc *rpc;
+  struct proc *rpp;
+
+  rpp = proc_addr(m_ptr->PR_PPROC_NR);
+  rpc = proc_addr(m_ptr->PR_PROC_NR);
+  if (! isemptyp(rpc)) return(EINVAL);
+
+  /* Copy parent 'proc' struct to child. */
+#if (CHIP == INTEL)
+  old_ldt_sel = rpc->p_ldt_sel;	/* stop this being obliterated by copy */
+#endif
+
+  *rpc = *rpp;					/* copy 'proc' struct */
+
+#if (CHIP == INTEL)
+  rpc->p_ldt_sel = old_ldt_sel;
+#endif
+  rpc->p_nr = m_ptr->PR_PROC_NR;	/* this was obliterated by copy */
+  rpc->p_ntf_q = NULL;			/* remove pending notifications */
+
+  /* Only one in group should have SIGNALED, child doesn't inherit tracing. */
+  rpc->p_rts_flags |= NO_MAP;		/* inhibit process from running */
+  rpc->p_rts_flags &= ~(SIGNALED | SIG_PENDING | P_STOP);
+  sigemptyset(&rpc->p_pending);
+
+  rpc->p_reg.retreg = 0;	/* child sees pid = 0 to know it is child */
+  rpc->p_user_time = 0;		/* set all the accounting times to 0 */
+  rpc->p_sys_time = 0;
+
+  return(OK);
+}
+
+#endif /* USE_FORK */
+