minix/servers/is/is.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. */
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 */
int sys_panic; /* flag to indicate system-wide panic */
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extern int errno; /* error number set by system library */
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/* Declare some local functions. */
FORWARD _PROTOTYPE(void init_server, (int argc, char **argv) );
FORWARD _PROTOTYPE(void exit_server, (void) );
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FORWARD _PROTOTYPE(void get_work, (void) );
FORWARD _PROTOTYPE(void reply, (int whom, int result) );
/*===========================================================================*
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* main *
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*===========================================================================*/
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PUBLIC int main(int argc, char **argv)
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{
/* 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;
sigset_t sigset;
/* Initialize the server, then go to work. */
init_server(argc, argv);
/* Main loop - get work and do it, forever. */
while (TRUE) {
/* Wait for incoming message, sets 'callnr' and 'who'. */
get_work();
switch (callnr) {
case SYS_SIG:
sigset = (sigset_t) m_in.NOTIFY_ARG;
if (sigismember(&sigset,SIGTERM) || sigismember(&sigset,SIGKSTOP)) {
exit_server();
}
continue;
case PANIC_DUMPS:
printf("Oops ... panic in %d. ", who);
printf("Hit F-keys for debug dumps or F12 to shut down.\n");
sys_panic = TRUE; /* set flag to allow exit */
continue;
case FKEY_PRESSED:
result = do_fkey_pressed(&m_in);
break;
default:
report("IS","warning, got illegal request from:", m_in.m_source);
result = EINVAL;
}
/* Finally send reply message, unless disabled. */
if (result != EDONTREPLY) {
reply(who, result);
}
}
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return(OK); /* shouldn't come here */
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}
/*===========================================================================*
* init_server *
*===========================================================================*/
PRIVATE void init_server(int argc, char **argv)
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{
/* Initialize the information service. */
int fkeys, sfkeys;
int i, s;
struct sigaction sigact;
/* Install signal handler. Ask PM to transform signal into message. */
sigact.sa_handler = SIG_MESS;
sigact.sa_mask = ~0; /* block all other signals */
sigact.sa_flags = 0; /* default behaviour */
if (sigaction(SIGTERM, &sigact, NULL) < 0)
report("IS","warning, sigaction() failed", errno);
/* Set key mappings. IS takes all of F1-F12 and Shift+F1-F6. */
fkeys = sfkeys = 0;
for (i=1; i<=12; i++) bit_set(fkeys, i);
for (i=1; i<= 7; i++) bit_set(sfkeys, i);
if ((s=fkey_map(&fkeys, &sfkeys)) != OK)
report("IS", "warning, fkey_map failed:", s);
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}
/*===========================================================================*
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* exit_server *
*===========================================================================*/
PRIVATE void exit_server()
{
/* Shut down the information service. */
int fkeys, sfkeys;
int i,s;
/* Release the function key mappings requested in init_server().
* IS took all of F1-F12 and Shift+F1-F6.
*/
fkeys = sfkeys = 0;
for (i=1; i<=12; i++) bit_set(fkeys, i);
for (i=1; i<= 7; i++) bit_set(sfkeys, i);
if ((s=fkey_unmap(&fkeys, &sfkeys)) != OK)
report("IS", "warning, unfkey_map failed:", s);
/* Done. Now exit. */
exit(0);
}
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/*===========================================================================*
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* get_work *
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*===========================================================================*/
PRIVATE void get_work()
{
int status = 0;
status = receive(ANY, &m_in); /* this blocks until message arrives */
if (OK != status)
panic("IS","failed to receive message!", status);
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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)
panic("IS", "unable to send reply!", send_status);
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}