186 lines
6.7 KiB
C
186 lines
6.7 KiB
C
/* Reincarnation Server. This servers starts new system services and detects
|
|
* they are exiting. In case of errors, system services can be restarted.
|
|
* The RS server periodically checks the status of all registered services
|
|
* services to see whether they are still alive. The system services are
|
|
* expected to periodically send a heartbeat message.
|
|
*
|
|
* Created:
|
|
* Jul 22, 2005 by Jorrit N. Herder
|
|
*/
|
|
#include "inc.h"
|
|
#include <minix/dmap.h>
|
|
#include "../../kernel/const.h"
|
|
#include "../../kernel/type.h"
|
|
|
|
/* Declare some local functions. */
|
|
FORWARD _PROTOTYPE(void init_server, (void) );
|
|
FORWARD _PROTOTYPE(void get_work, (message *m) );
|
|
FORWARD _PROTOTYPE(void reply, (int whom, int result) );
|
|
|
|
/* Data buffers to retrieve info during initialization. */
|
|
PRIVATE struct boot_image image[NR_BOOT_PROCS];
|
|
PUBLIC struct dmap dmap[NR_DEVICES];
|
|
|
|
/*===========================================================================*
|
|
* main *
|
|
*===========================================================================*/
|
|
PUBLIC int 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.
|
|
*/
|
|
message m; /* request message */
|
|
int call_nr, who; /* call number and caller */
|
|
int result; /* result to return */
|
|
sigset_t sigset; /* system signal set */
|
|
int s;
|
|
|
|
/* Initialize the server, then go to work. */
|
|
init_server();
|
|
|
|
/* Main loop - get work and do it, forever. */
|
|
while (TRUE) {
|
|
|
|
/* Wait for request message. */
|
|
get_work(&m);
|
|
who = m.m_source;
|
|
call_nr = m.m_type;
|
|
|
|
/* Now determine what to do. Three types of requests are expected:
|
|
* - Heartbeat messages (notifications from registered system services)
|
|
* - System notifications (POSIX signals or synchronous alarm)
|
|
* - User requests (control messages to manage system services)
|
|
*/
|
|
|
|
/* Notification messages are control messages and do not need a reply.
|
|
* These include heartbeat messages and system notifications.
|
|
*/
|
|
if (m.m_type & NOTIFY_MESSAGE) {
|
|
switch (call_nr) {
|
|
case SYN_ALARM:
|
|
do_period(&m); /* check drivers status */
|
|
continue;
|
|
case SYS_SIG:
|
|
sigset = (sigset_t) m.NOTIFY_ARG; /* check signals passed */
|
|
if (sigismember(&sigset, SIGCHLD)) do_exit(&m);
|
|
if (sigismember(&sigset, SIGTERM)) do_shutdown(NULL);
|
|
if (sigismember(&sigset, SIGKSTOP)) do_shutdown(NULL);
|
|
continue;
|
|
default: /* heartbeat notification */
|
|
if (rproc_ptr[who] != NULL) /* mark heartbeat time */
|
|
rproc_ptr[who]->r_alive_tm = m.NOTIFY_TIMESTAMP;
|
|
}
|
|
}
|
|
|
|
/* If this is not a notification message, it is a normal request.
|
|
* Handle the request and send a reply to the caller.
|
|
*/
|
|
else {
|
|
switch(call_nr) {
|
|
case RS_UP: result = do_up(&m); break;
|
|
case RS_DOWN: result = do_down(&m); break;
|
|
case RS_REFRESH: result = do_refresh(&m); break;
|
|
case RS_RESCUE: result = do_rescue(&m); break;
|
|
case RS_SHUTDOWN: result = do_shutdown(&m); break;
|
|
case GETSYSINFO: result = do_getsysinfo(&m); break;
|
|
default:
|
|
printf("Warning, RS got unexpected request %d from %d\n",
|
|
m.m_type, m.m_source);
|
|
result = EINVAL;
|
|
}
|
|
|
|
/* Finally send reply message, unless disabled. */
|
|
if (result != EDONTREPLY) {
|
|
reply(who, result);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* init_server *
|
|
*===========================================================================*/
|
|
PRIVATE void init_server(void)
|
|
{
|
|
/* Initialize the reincarnation server. */
|
|
struct sigaction sa;
|
|
struct boot_image *ip;
|
|
int s,t;
|
|
|
|
/* Install signal handlers. Ask PM to transform signal into message. */
|
|
sa.sa_handler = SIG_MESS;
|
|
sigemptyset(&sa.sa_mask);
|
|
sa.sa_flags = 0;
|
|
if (sigaction(SIGCHLD,&sa,NULL)<0) panic("RS","sigaction failed", errno);
|
|
if (sigaction(SIGTERM,&sa,NULL)<0) panic("RS","sigaction failed", errno);
|
|
if (sigaction(SIGABRT,&sa,NULL)<0) panic("RS","sigaction failed", errno);
|
|
if (sigaction(SIGHUP, &sa,NULL)<0) panic("RS","sigaction failed", errno);
|
|
|
|
/* Initialize the system process table. Use the boot image from the kernel
|
|
* and the device map from the FS to gather all needed information.
|
|
*/
|
|
if ((s = sys_getimage(image)) != OK)
|
|
panic("RS","warning: couldn't get copy of image table", s);
|
|
if ((s = getsysinfo(FS_PROC_NR, SI_DMAP_TAB, dmap)) < 0)
|
|
panic("RS","warning: couldn't get copy of dmap table", errno);
|
|
|
|
/* Now initialize the table with the processes in the system image.
|
|
* Prepend /sbin/ to the binaries so that we can actually find them.
|
|
*/
|
|
for (s=0; s< NR_BOOT_PROCS; s++) {
|
|
ip = &image[s];
|
|
if (ip->proc_nr >= 0) {
|
|
nr_in_use ++;
|
|
rproc[s].r_flags = RS_IN_USE;
|
|
rproc[s].r_proc_nr = ip->proc_nr;
|
|
rproc[s].r_pid = getnpid(ip->proc_nr);
|
|
for(t=0; t< NR_DEVICES; t++)
|
|
if (dmap[t].dmap_driver == ip->proc_nr)
|
|
rproc[s].r_dev_nr = t;
|
|
strcpy(rproc[s].r_cmd, "/sbin/");
|
|
strcpy(rproc[s].r_cmd+6, ip->proc_name);
|
|
rproc[s].r_argc = 1;
|
|
rproc[s].r_argv[0] = rproc[s].r_cmd;
|
|
rproc[s].r_argv[1] = NULL;
|
|
}
|
|
}
|
|
|
|
/* Set alarm to periodically check driver status. */
|
|
if (OK != (s=sys_setalarm(RS_DELTA_T, 0)))
|
|
panic("RS", "couldn't set alarm", s);
|
|
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* get_work *
|
|
*===========================================================================*/
|
|
PRIVATE void get_work(m_in)
|
|
message *m_in; /* pointer to message */
|
|
{
|
|
int s; /* receive status */
|
|
if (OK != (s=receive(ANY, m_in))) /* wait for message */
|
|
panic("RS","receive failed", s);
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* reply *
|
|
*===========================================================================*/
|
|
PRIVATE void reply(who, result)
|
|
int who; /* replyee */
|
|
int result; /* report result */
|
|
{
|
|
message m_out; /* reply message */
|
|
int s; /* send status */
|
|
|
|
m_out.m_type = result; /* build reply message */
|
|
if (OK != (s=send(who, &m_out))) /* send the message */
|
|
panic("RS", "unable to send reply", s);
|
|
}
|
|
|
|
|
|
|