5a9dec8bd2
New Shift-F6 dump for RS server at IS. New getnpid, getnproc, getpproc library calls at PM. New reincarnation server (basic functionality is there now).
227 lines
7.5 KiB
C
227 lines
7.5 KiB
C
/* Reincarnation Server. This servers starts new system services and detects
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* they are exiting. In case of errors, system services can be restarted.
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* The RS server periodically checks the status of all registered services
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* services to see whether they are still alive. The system services are
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* expected to periodically send a heartbeat message.
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*
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* Created:
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* Jul 22, 2005 by Jorrit N. Herder
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*/
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#include "rs.h"
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#include <minix/dmap.h>
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#include "../../kernel/const.h"
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#include "../../kernel/type.h"
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/* Declare some local functions. */
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FORWARD _PROTOTYPE(void init_server, (void) );
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FORWARD _PROTOTYPE(void get_work, (message *m) );
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FORWARD _PROTOTYPE(void reply, (int whom, int result) );
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FORWARD _PROTOTYPE(int do_getsysinfo, (message *m) );
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/* Data buffers to retrieve info during initialization. */
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PRIVATE struct boot_image image[NR_BOOT_PROCS];
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PUBLIC struct dmap dmap[NR_DEVICES];
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/*===========================================================================*
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* main *
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*===========================================================================*/
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PUBLIC int main(void)
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{
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/* This is the main routine of this service. The main loop consists of
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* three major activities: getting new work, processing the work, and
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* sending the reply. The loop never terminates, unless a panic occurs.
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*/
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message m; /* request message */
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int call_nr, who; /* call number and caller */
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int result; /* result to return */
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sigset_t sigset; /* system signal set */
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int s;
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/* Initialize the server, then go to work. */
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init_server();
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/* Main loop - get work and do it, forever. */
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while (TRUE) {
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/* Wait for request message. */
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get_work(&m);
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who = m.m_source;
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call_nr = m.m_type;
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/* Now determine what to do. Three types of requests are expected:
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* - Heartbeat messages (notifications from registered system services)
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* - System notifications (POSIX signals or synchronous alarm)
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* - User requests (control messages to manage system services)
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*/
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/* Notification messages are control messages and do not need a reply.
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* These include heartbeat messages and system notifications.
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*/
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if (m.m_type & NOTIFY_MESSAGE) {
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switch (call_nr) {
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case SYN_ALARM:
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do_period(&m); /* check drivers status */
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continue; /* no reply is expected */
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case SYS_SIG:
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sigset = (sigset_t) m.NOTIFY_ARG;
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if (sigismember(&sigset, SIGCHLD)) {
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do_exit(&m);
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}
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if (sigismember(&sigset, SIGTERM) ||
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sigismember(&sigset, SIGKSTOP)) {
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/* Prevent restarting services. */
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do_shutdown(NULL);
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}
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continue; /* no reply is expected */
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default: /* heartbeat notification */
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printf("Got heartbeat from %d\n", who);
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if (rproc_ptr[who] != NULL) /* mark heartbeat time */
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rproc_ptr[who]->r_alive_tm = m.NOTIFY_TIMESTAMP;
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}
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}
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/* If this is not a notification message, it is a normal request.
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* Handle the request and send a reply to the caller.
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*/
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else {
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switch(call_nr) {
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case SRV_UP:
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result = do_start(&m);
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break;
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case SRV_DOWN:
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result = do_stop(&m);
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break;
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case SRV_SHUTDOWN:
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result = do_shutdown(&m);
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break;
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case GETSYSINFO:
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printf("RS got GETSYSINFO request from %d\n", m.m_source);
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result = do_getsysinfo(&m);
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break;
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default:
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printf("Warning, RS got unexpected request %d from %d\n",
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m.m_type, m.m_source);
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result = EINVAL;
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}
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/* Finally send reply message, unless disabled. */
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if (result != EDONTREPLY) {
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reply(who, result);
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}
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}
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}
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}
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/*===========================================================================*
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* init_server *
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*===========================================================================*/
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PRIVATE void init_server(void)
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{
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/* Initialize the reincarnation server. */
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struct sigaction sa;
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struct boot_image *ip;
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int s,t;
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/* Install signal handlers. Ask PM to transform signal into message. */
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sa.sa_handler = SIG_MESS;
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = 0;
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if (sigaction(SIGCHLD,&sa,NULL)<0) panic("RS","sigaction failed", errno);
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if (sigaction(SIGTERM,&sa,NULL)<0) panic("RS","sigaction failed", errno);
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if (sigaction(SIGABRT,&sa,NULL)<0) panic("RS","sigaction failed", errno);
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if (sigaction(SIGHUP, &sa,NULL)<0) panic("RS","sigaction failed", errno);
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/* Initialize the system process table. Use the boot image from the kernel
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* and the device map from the FS to gather all needed information.
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*/
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if ((s = sys_getimage(image)) != OK)
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panic("RS","warning: couldn't get copy of image table", s);
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if ((s = getsysinfo(FS_PROC_NR, SI_DMAP_TAB, dmap)) < 0)
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panic("RS","warning: couldn't get copy of dmap table", errno);
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/* Change working directory to /sbin, where the binaries for the programs
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* in the system image are.
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*/
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chdir("/sbin/");
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for (s=0; s< NR_BOOT_PROCS; s++) {
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ip = &image[s];
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if (ip->proc_nr >= 0) {
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nr_in_use ++;
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rproc[s].r_flags = IN_USE;
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rproc[s].r_proc_nr = ip->proc_nr;
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rproc[s].r_pid = getnpid(ip->proc_nr);
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for(t=0; t< NR_DEVICES; t++)
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if (dmap[t].dmap_driver == ip->proc_nr)
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rproc[s].r_dev_nr = t;
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strcpy(rproc[s].r_cmd, ip->proc_name);
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rproc[s].r_argc = 1;
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rproc[s].r_argv[0] = rproc[s].r_cmd;
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rproc[s].r_argv[1] = NULL;
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}
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}
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/* Set alarm to periodically check driver status. */
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if (OK != (s=sys_setalarm(HZ, 0)))
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panic("RS", "couldn't set alarm", s);
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}
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/*===========================================================================*
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* do_getsysinfo *
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*===========================================================================*/
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PRIVATE int do_getsysinfo(m_ptr)
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message *m_ptr;
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{
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vir_bytes src_addr, dst_addr;
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int dst_proc;
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size_t len;
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int s;
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switch(m_ptr->m1_i1) {
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case SI_PROC_TAB:
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src_addr = (vir_bytes) rproc;
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len = sizeof(struct rproc) * NR_SYS_PROCS;
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break;
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default:
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return(EINVAL);
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}
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dst_proc = m_ptr->m_source;
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dst_addr = (vir_bytes) m_ptr->m1_p1;
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if (OK != (s=sys_datacopy(SELF, src_addr, dst_proc, dst_addr, len)))
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return(s);
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return(OK);
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}
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/*===========================================================================*
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* get_work *
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*===========================================================================*/
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PRIVATE void get_work(m_in)
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message *m_in; /* pointer to message */
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{
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int s; /* receive status */
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if (OK != (s=receive(ANY, m_in))) /* wait for message */
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panic("RS","receive failed", s);
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}
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/*===========================================================================*
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* reply *
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*===========================================================================*/
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PRIVATE void reply(who, result)
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int who; /* replyee */
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int result; /* report result */
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{
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message m_out; /* reply message */
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int s; /* send status */
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m_out.m_type = result; /* build reply message */
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if (OK != (s=send(who, &m_out))) /* send the message */
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panic("RS", "unable to send reply", s);
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}
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