223 lines
7.4 KiB
C
223 lines
7.4 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 <fcntl.h>
|
|
#include <minix/endpoint.h>
|
|
#include "../../kernel/const.h"
|
|
#include "../../kernel/type.h"
|
|
|
|
/* Declare some local functions. */
|
|
FORWARD _PROTOTYPE(void init_server, (void) );
|
|
FORWARD _PROTOTYPE(void sig_handler, (void) );
|
|
FORWARD _PROTOTYPE(void get_work, (message *m) );
|
|
FORWARD _PROTOTYPE(void reply, (int whom, message *m_out) );
|
|
|
|
/* Data buffers to retrieve info during initialization. */
|
|
PRIVATE struct boot_image image[NR_BOOT_PROCS];
|
|
|
|
long rs_verbose = 0;
|
|
|
|
/*===========================================================================*
|
|
* 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_e,who_p; /* call number and caller */
|
|
int result; /* result to return */
|
|
sigset_t sigset; /* system signal set */
|
|
int s;
|
|
uid_t euid;
|
|
|
|
/* 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_e = m.m_source;
|
|
who_p = _ENDPOINT_P(who_e);
|
|
if(who_p < -NR_TASKS || who_p >= NR_PROCS)
|
|
panic("RS","message from bogus source", who_e);
|
|
|
|
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 PROC_EVENT:
|
|
sig_handler();
|
|
continue;
|
|
default: /* heartbeat notification */
|
|
if (rproc_ptr[who_p] != NULL) /* mark heartbeat time */
|
|
rproc_ptr[who_p]->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 {
|
|
if (call_nr < RS_RQ_BASE || call_nr >= RS_RQ_BASE+0x100)
|
|
{
|
|
/* Ignore invalid requests. Do not try to reply. */
|
|
printf("RS: got invalid request %d from endpoint %d\n",
|
|
call_nr, m.m_source);
|
|
continue;
|
|
}
|
|
|
|
/* Only root can make calls to rs */
|
|
euid= getpeuid(m.m_source);
|
|
if (euid != 0)
|
|
{
|
|
printf("RS: got unauthorized request %d from endpoint %d\n",
|
|
call_nr, m.m_source);
|
|
m.m_type = EPERM;
|
|
reply(who_e, &m);
|
|
continue;
|
|
}
|
|
|
|
switch(call_nr) {
|
|
case RS_UP: result = do_up(&m, FALSE, 0); break;
|
|
case RS_UP_COPY: result = do_up(&m, TRUE, 0); break;
|
|
case RS_START: result = do_start(&m); break;
|
|
case RS_DOWN: result = do_down(&m); break;
|
|
case RS_REFRESH: result = do_refresh(&m); break;
|
|
case RS_RESTART: result = do_restart(&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) {
|
|
m.m_type = result;
|
|
reply(who_e, &m);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
/*===========================================================================*
|
|
* 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);
|
|
|
|
/* 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);
|
|
|
|
/* Set alarm to periodically check driver status. */
|
|
if (OK != (s=sys_setalarm(RS_DELTA_T, 0)))
|
|
panic("RS", "couldn't set alarm", s);
|
|
|
|
/* See if we run in verbose mode. */
|
|
env_parse("rs_verbose", "d", 0, &rs_verbose, 0, 1);
|
|
|
|
/* Initialize the exec pipe. */
|
|
if (pipe(exec_pipe) == -1)
|
|
panic("RS", "pipe failed", errno);
|
|
if (fcntl(exec_pipe[0], F_SETFD,
|
|
fcntl(exec_pipe[0], F_GETFD) | FD_CLOEXEC) == -1)
|
|
{
|
|
panic("RS", "fcntl set FD_CLOEXEC on pipe input failed", errno);
|
|
}
|
|
if (fcntl(exec_pipe[1], F_SETFD,
|
|
fcntl(exec_pipe[1], F_GETFD) | FD_CLOEXEC) == -1)
|
|
{
|
|
panic("RS", "fcntl set FD_CLOEXEC on pipe output failed", errno);
|
|
}
|
|
if (fcntl(exec_pipe[0], F_SETFL,
|
|
fcntl(exec_pipe[0], F_GETFL) | O_NONBLOCK) == -1)
|
|
{
|
|
panic("RS", "fcntl set O_NONBLOCK on pipe input failed", errno);
|
|
}
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* sig_handler *
|
|
*===========================================================================*/
|
|
PRIVATE void sig_handler()
|
|
{
|
|
sigset_t sigset;
|
|
int sig;
|
|
|
|
/* Try to obtain signal set from PM. */
|
|
if (getsigset(&sigset) != 0) return;
|
|
|
|
/* Check for known signals. */
|
|
if (sigismember(&sigset, SIGCHLD)) do_exit(NULL);
|
|
if (sigismember(&sigset, SIGTERM)) do_shutdown(NULL);
|
|
}
|
|
|
|
/*===========================================================================*
|
|
* 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, m_out)
|
|
int who; /* replyee */
|
|
message *m_out; /* reply message */
|
|
{
|
|
int s; /* send status */
|
|
|
|
s = sendnb(who, m_out); /* send the message */
|
|
if (s != OK)
|
|
printf("RS: unable to send reply to %d: %d\n", who, s);
|
|
}
|
|
|
|
|
|
|
|
|