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libchardriver: make some pointers constant

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Change-Id: Ieabc6962d10f9f6e0db7807fd24add212bcfc148
This commit is contained in:
David van Moolenbroek 2016-05-01 12:48:46 +00:00
parent 4cb315c484
commit 91d0779762
2 changed files with 14 additions and 12 deletions
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6
minix/include/minix/chardriver.h
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@ -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);

20
minix/lib/libchardriver/chardriver.c
View File

@ -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);