minix/servers/is/main.c
Kees van Reeuwijk 2ba237cd4e Fixed a number of uses of uninitialized variables by adding assertions
or other sanity checks, code reshuffling, or fixing broken behavior.
2010-01-27 10:23:58 +00:00

172 lines
5.6 KiB
C

/* 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 "inc.h"
#include <minix/endpoint.h>
/* Allocate space for the global variables. */
message m_in; /* the input message itself */
message m_out; /* the output message used for reply */
int who_e; /* caller's proc number */
int callnr; /* system call number */
extern int errno; /* error number set by system library */
/* Declare some local functions. */
FORWARD _PROTOTYPE(void sig_handler, (void) );
FORWARD _PROTOTYPE(void get_work, (void) );
FORWARD _PROTOTYPE(void reply, (int whom, int result) );
/* SEF functions and variables. */
FORWARD _PROTOTYPE( void sef_local_startup, (void) );
FORWARD _PROTOTYPE( int sef_cb_init_fresh, (int type, sef_init_info_t *info) );
/*===========================================================================*
* main *
*===========================================================================*/
PUBLIC int main(int argc, char **argv)
{
/* 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;
/* SEF local startup. */
env_setargs(argc, argv);
sef_local_startup();
/* Main loop - get work and do it, forever. */
while (TRUE) {
/* Wait for incoming message, sets 'callnr' and 'who'. */
get_work();
if (is_notify(callnr)) {
switch (_ENDPOINT_P(who_e)) {
case SYSTEM:
printf("got message from SYSTEM\n");
sigset = m_in.NOTIFY_ARG;
for ( result=0; result< _NSIG; result++) {
if (sigismember(&sigset, result))
printf("signal %d found\n", result);
}
continue;
case PM_PROC_NR:
sig_handler();
continue;
case TTY_PROC_NR:
result = do_fkey_pressed(&m_in);
break;
default:
/* FIXME: error message. */
result = EDONTREPLY;
break;
}
}
else {
printf("IS: warning, got illegal request %d from %d\n",
callnr, m_in.m_source);
result = EDONTREPLY;
}
/* Finally send reply message, unless disabled. */
if (result != EDONTREPLY) {
reply(who_e, result);
}
}
return(OK); /* shouldn't come here */
}
/*===========================================================================*
* sef_local_startup *
*===========================================================================*/
PRIVATE void sef_local_startup()
{
/* Register init callbacks. */
sef_setcb_init_fresh(sef_cb_init_fresh);
sef_setcb_init_lu(sef_cb_init_fresh);
sef_setcb_init_restart(sef_cb_init_fresh);
/* Register live update callbacks. */
sef_setcb_lu_prepare(sef_cb_lu_prepare_always_ready);
sef_setcb_lu_state_isvalid(sef_cb_lu_state_isvalid_standard);
/* Let SEF perform startup. */
sef_startup();
}
/*===========================================================================*
* sef_cb_init_fresh *
*===========================================================================*/
PRIVATE int sef_cb_init_fresh(int type, sef_init_info_t *info)
{
/* Initialize the information server. */
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. */
map_unmap_fkeys(TRUE /*map*/);
return(OK);
}
/*===========================================================================*
* sig_handler *
*===========================================================================*/
PRIVATE void sig_handler()
{
sigset_t sigset;
/* Try to obtain signal set from PM. */
if (getsigset(&sigset) != 0) return;
/* Only check for termination signal. */
if (!sigismember(&sigset, SIGTERM)) return;
/* Shutting down. Unset key mappings, and quit. */
map_unmap_fkeys(FALSE /*map*/);
exit(0);
}
/*===========================================================================*
* get_work *
*===========================================================================*/
PRIVATE void get_work()
{
int status = 0;
status = sef_receive(ANY, &m_in); /* this blocks until message arrives */
if (OK != status)
panic("IS","sef_receive failed!", status);
who_e = 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);
}