From: David van Moolenbroek <david@minix3.org>
Date: Sun, 1 May 2016 12:48:46 +0000 (+0000)
Subject: libchardriver: make some pointers constant
X-Git-Url: http://zhaoyanbai.com/repos/%22http:/www.isc.org/icons/zlib_tech.html?a=commitdiff_plain;h=91d0779762c1076cc79ebf98392124badd86861a;p=minix.git

libchardriver: make some pointers constant

Change-Id: Ieabc6962d10f9f6e0db7807fd24add212bcfc148
---

diff --git a/minix/include/minix/chardriver.h b/minix/include/minix/chardriver.h
index 48f67ae84..a6ac1dff6 100644
--- a/minix/include/minix/chardriver.h
+++ b/minix/include/minix/chardriver.h
@@ -24,11 +24,11 @@ struct chardriver {
 
 /* Functions defined by libchardriver. */
 void chardriver_announce(void);
-int chardriver_get_minor(message *m, devminor_t *minor);
-void chardriver_process(struct chardriver *cdp, message *m_ptr,
+int chardriver_get_minor(const message *m, devminor_t *minor);
+void chardriver_process(const struct chardriver *cdp, message *m_ptr,
 	int ipc_status);
 void chardriver_terminate(void);
-void chardriver_task(struct chardriver *cdp);
+void chardriver_task(const struct chardriver *cdp);
 
 void chardriver_reply_task(endpoint_t endpt, cdev_id_t id, int r);
 void chardriver_reply_select(endpoint_t endpt, devminor_t minor, int ops);
diff --git a/minix/lib/libchardriver/chardriver.c b/minix/lib/libchardriver/chardriver.c
index 6d1922dd4..12b95f391 100644
--- a/minix/lib/libchardriver/chardriver.c
+++ b/minix/lib/libchardriver/chardriver.c
@@ -276,7 +276,7 @@ static void chardriver_reply(message *mess, int ipc_status, int r)
 /*===========================================================================*
  *				do_open					     *
  *===========================================================================*/
-static int do_open(struct chardriver *cdp, message *m_ptr)
+static int do_open(const struct chardriver *cdp, message *m_ptr)
 {
 /* Open a minor device. */
   endpoint_t user_endpt;
@@ -307,7 +307,7 @@ static int do_open(struct chardriver *cdp, message *m_ptr)
 /*===========================================================================*
  *				do_close				     *
  *===========================================================================*/
-static int do_close(struct chardriver *cdp, message *m_ptr)
+static int do_close(const struct chardriver *cdp, message *m_ptr)
 {
 /* Close a minor device. */
   devminor_t minor;
@@ -325,7 +325,8 @@ static int do_close(struct chardriver *cdp, message *m_ptr)
 /*===========================================================================*
  *				do_trasnfer				     *
  *===========================================================================*/
-static int do_transfer(struct chardriver *cdp, message *m_ptr, int do_write)
+static int do_transfer(const struct chardriver *cdp, message *m_ptr,
+	int do_write)
 {
 /* Carry out a read or write task request. */
   devminor_t minor;
@@ -359,7 +360,7 @@ static int do_transfer(struct chardriver *cdp, message *m_ptr, int do_write)
 /*===========================================================================*
  *				do_ioctl				     *
  *===========================================================================*/
-static int do_ioctl(struct chardriver *cdp, message *m_ptr)
+static int do_ioctl(const struct chardriver *cdp, message *m_ptr)
 {
 /* Carry out an I/O control task request. */
   devminor_t minor;
@@ -388,7 +389,7 @@ static int do_ioctl(struct chardriver *cdp, message *m_ptr)
 /*===========================================================================*
  *				do_cancel				     *
  *===========================================================================*/
-static int do_cancel(struct chardriver *cdp, message *m_ptr)
+static int do_cancel(const struct chardriver *cdp, message *m_ptr)
 {
 /* Cancel a suspended (read, write, ioctl) task request. The original request
  * may already have finished, in which case no reply should be sent.
@@ -412,7 +413,7 @@ static int do_cancel(struct chardriver *cdp, message *m_ptr)
 /*===========================================================================*
  *				do_select				     *
  *===========================================================================*/
-static int do_select(struct chardriver *cdp, message *m_ptr)
+static int do_select(const struct chardriver *cdp, message *m_ptr)
 {
 /* Perform a select query on a minor device. */
   devminor_t minor;
@@ -451,7 +452,8 @@ static void do_block_open(message *m_ptr, int ipc_status)
 /*===========================================================================*
  *				chardriver_process			     *
  *===========================================================================*/
-void chardriver_process(struct chardriver *cdp, message *m_ptr, int ipc_status)
+void chardriver_process(const struct chardriver *cdp, message *m_ptr,
+	int ipc_status)
 {
 /* Call the appropiate driver function, based on the type of request. Send a
  * reply to the caller if necessary.
@@ -544,7 +546,7 @@ void chardriver_terminate(void)
 /*===========================================================================*
  *				chardriver_task				     *
  *===========================================================================*/
-void chardriver_task(struct chardriver *cdp)
+void chardriver_task(const struct chardriver *cdp)
 {
 /* Main program of any character device driver task. */
   int r, ipc_status;
@@ -570,7 +572,7 @@ void chardriver_task(struct chardriver *cdp)
 /*===========================================================================*
  *				chardriver_get_minor			     *
  *===========================================================================*/
-int chardriver_get_minor(message *m, devminor_t *minor)
+int chardriver_get_minor(const message *m, devminor_t *minor)
 {
   assert(NULL != m);
   assert(NULL != minor);