From: Jorrit Herder <jnherder@minix3.org>
Date: Fri, 22 Jul 2005 09:20:43 +0000 (+0000)
Subject: *** empty log message ***
X-Git-Tag: v3.1.0~573
X-Git-Url: http://zhaoyanbai.com/repos/Bv9ARM.ch08.html?a=commitdiff_plain;h=80816ab0012bb89fcfc4dc1aec60bac84ce276c6;p=minix.git

*** empty log message ***
---

diff --git a/kernel/system/do_privctl.c b/kernel/system/do_privctl.c
new file mode 100644
index 000000000..cad78ad3b
--- /dev/null
+++ b/kernel/system/do_privctl.c
@@ -0,0 +1,43 @@
+/* The system call implemented in this file:
+ *   m_type:	SYS_PRIVCTL
+ *
+ * The parameters for this system call are:
+ *    m2_i1:	CTL_PROC_NR 	(process number of caller)	
+ */
+
+#include "../system.h"
+#include "../ipc.h"
+
+#if USE_PRIVCTL
+
+/*===========================================================================*
+ *				do_privctl				     *
+ *===========================================================================*/
+PUBLIC int do_privctl(m_ptr)
+message *m_ptr;			/* pointer to request message */
+{
+/* Handle sys_privctl(). Update a process' privileges. If the process is not
+ * yet a system process, make sure it gets its own privilege structure.
+ */
+  register struct proc *rp;
+  register struct priv *sp;
+  int proc_nr;
+
+  /* Extract message parameters. */
+  proc_nr = m_ptr->CTL_PROC_NR;
+  if (proc_nr == SELF) proc_nr = m_ptr->m_source;
+  if (! isokprocn(proc_nr)) return(EINVAL);
+
+  rp = proc_addr(proc_nr);
+
+  /* Make sure this process has its own privileges structure. */
+  if (! (priv(rp)->s_flags & SYS_PROC)) 
+      set_priv(rp, SYS_PROC);
+
+  /* Now update the process' privileges as requested. */
+  rp->p_priv->s_call_mask = SYSTEM_CALL_MASK;
+  return(OK);
+}
+
+#endif /* USE_PRIVCTL */
+