minix/servers/is/main.c

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/* System Information Service.
* This service handles the various debugging dumps, such as the process
* table, so that these no longer directly touch kernel memory. Instead, the
* system task is asked to copy some table in local memory.
*
* Created:
* Apr 29, 2004 by Jorrit N. Herder
*/
#include "is.h"
/* Set debugging level to 0, 1, or 2 to see no, some, all debug output. */
#define DEBUG_LEVEL 1
#define DPRINTF if (DEBUG_LEVEL > 0) printf
/* Allocate space for the global variables. */
int is_proc_nr; /* own process number */
message m_in; /* the input message itself */
message m_out; /* the output message used for reply */
int who; /* caller's proc number */
int callnr; /* system call number */
/* Diagnostic messages buffer. */
char diag_buf[DIAG_BUF_SIZE];
int diag_size = 0;
int diag_next = 0;
/* Declare some local functions. */
FORWARD _PROTOTYPE(void init_server, (void) );
FORWARD _PROTOTYPE(void get_work, (void) );
FORWARD _PROTOTYPE(void reply, (int whom, int result) );
/*===========================================================================*
* main *
*===========================================================================*/
PUBLIC void main(void)
{
/* This is the main routine of this service. The main loop consists of
* three major activities: getting new work, processing the work, and
* sending the reply. The loop never terminates, unless a panic occurs.
*/
int result;
static long count;
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/* Initialize the server, then go to work. */
init_server();
/* Main loop - get work and do it, forever. */
while (TRUE) {
/* Wait for incoming message, sets 'callnr' and 'who'. */
get_work();
switch (callnr) {
case NEW_KMESS:
result = do_new_kmess(&m_in);
break;
case DIAGNOSTICS:
result = do_diagnostics(&m_in);
break;
case FKEY_PRESSED:
result = do_fkey_pressed(&m_in);
break;
case HARD_STOP:
sys_exit(0);
/* never reached */
continue;
default:
printf("Warning %u, IS got unexpected request %d from %d\n",
++count, m_in.m_type, m_in.m_source);
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result = EINVAL;
}
/* Finally send reply message, unless disabled. */
if (result != EDONTREPLY) {
reply(who, result);
}
}
}
/*===========================================================================*
* report *
*===========================================================================*/
PUBLIC void report(mess, num)
char *mess; /* message format to print */
int num; /* number to go with the message */
{
if (num != NO_NUM) {
printf("IS: %s %d\n", mess, num);
} else {
printf("IS: %s\n", mess);
}
}
/*===========================================================================*
* init_server *
*===========================================================================*/
PRIVATE void init_server()
{
/* Initialize the information service. */
message m;
int r;
long key;
/* Set own process number. */
is_proc_nr = IS_PROC_NR;
/* Set key mappings. IS takes all of F2-F12. F1 is TTY reserved. */
for (key=F1; key<=F12; key++) {
if ((r=fkey_enable(key)) != OK) {
printf("IS: WARNING: couldn't register F%d key: %d\n",
(key-F1+1), r);
}
}
/* Display status message ... */
printf("IS: information service is alive and kicking; press F1-F12 for dumps\n");
}
/*===========================================================================*
* get_work *
*===========================================================================*/
PRIVATE void get_work()
{
int status = 0;
status = receive(ANY, &m_in); /* this blocks until message arrives */
if (OK != status)
server_panic("IS","failed to receive message!", status);
who = m_in.m_source; /* message arrived! set sender */
callnr = m_in.m_type; /* set function call number */
}
/*===========================================================================*
* reply *
*===========================================================================*/
PRIVATE void reply(who, result)
int who; /* destination */
int result; /* report result to replyee */
{
int send_status;
m_out.m_type = result; /* build reply message */
send_status = send(who, &m_out); /* send the message */
if (OK != send_status)
server_panic("IS", "unable to send reply!", send_status);
}