/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License, Version 1.0 only * (the "License"). You may not use this file except in compliance * with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ /* All Rights Reserved */ /* * Copyright 2005 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ #pragma ident "%Z%%M% %I% %E% SMI" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "msgs.h" #include "extern.h" #include #include "misc.h" #include "structs.h" #include #define RESP 1 /* pollfail via no response to sanity poll */ #define DEATH 2 /* pollfail via child death */ /* signal whose dispositions will be changed */ static struct sigaction Sigpoll; /* SIGPOLL */ static struct sigaction Sigcld; /* SIGCLD */ static struct sigaction Sigalrm; /* SIGALRM */ static sigset_t Origmask; /* original signal mask */ void usage(void); void initialize(void); void startpms(void); void readutmpx(void); int startpm(struct sactab *); void cleanutx(struct sactab *); void account(struct sactab *, pid_t); void startit(struct sactab *); char **mkargv(struct sactab *); void pollpms(void); void reap(int); void pollfail(struct sactab *, int); void readpipe(void); int validstate(unchar); int mk_cmd_pipe(void); void startpoll(void); /* * main - scan args for sac, initialize everything, and wait for commands * from sacadm via the command pipe */ int main(int argc, char *argv[]) { int c; /* place to hold options */ struct sigaction sigact; /* for signal handling */ (void) sigprocmask(SIG_SETMASK, NULL, &Origmask); if (argc == 1) usage(); (void) setpgrp(); while ((c = getopt(argc, argv, "t:")) != -1) { switch (c) { case 't': if (Stime != 0) usage(); Stime = atoi(optarg); if (Stime <= 0) usage(); break; case '?': usage(); } } if (optind < argc) usage(); initialize(); sigact.sa_flags = 0; sigact.sa_handler = pollpms; (void) sigemptyset(&sigact.sa_mask); (void) sigaddset(&sigact.sa_mask, SIGALRM); (void) sigaction(SIGALRM, &sigact, &Sigalrm); /* * minimize time spent in STARTING or UNKNOWN, pollpms() sets alarm */ pollpms(); for (;;) readpipe(); } /* * usage - output a usage message on the console */ void usage() { FILE *fp; /* scratch file pointer */ fp = fopen("/dev/console", "w"); if (fp) (void) fprintf(fp, "SAC: Usage: sac -t sanity_interval\n"); exit(1); } /* * initialize - initialization stuff */ void initialize() { int ret; /* return code from doconfig() */ struct sigaction sigact; /* for signal handling */ openlog(); log("*** SAC starting ***"); #ifdef DEBUG opendebug(); log("Debugging turned on"); #endif if (chdir(HOME) < 0) error(E_CHDIR, EXIT); /* * pass an invalid fd, shouldn't be doing pushes and pops in this per-system * configuration script (_sysconfig) */ if ((ret = doconfig(-1, SYSCONFIG, 0)) != 0) { if (ret == -1) error(E_SYSCONF, EXIT); else { (void) sprintf(Scratch, "Error in _sysconfig: line %d", ret); log(Scratch); error(E_BADSYSCONF, EXIT); } } sigact.sa_flags = 0; sigact.sa_handler = reap; (void) sigemptyset(&sigact.sa_mask); (void) sigaddset(&sigact.sa_mask, SIGCLD); (void) sigaction(SIGCLD, &sigact, &Sigcld); /* * establish pipe for PMS to communicate with sac */ if (access("_sacpipe", 0) != 0) { /* not there, create one */ (void) umask(0); if (mknod("_sacpipe", S_IFIFO | 0600, 0) < 0) error(E_NOPIPE, EXIT); } Sfd = open("_sacpipe", O_RDWR); if (Sfd < 0) error(E_NOPIPE, EXIT); /* * establish pipe for sacadm to communicate with sac */ Cfd = mk_cmd_pipe(); /* * read in _sactab, but don't start port monitors as a by-product * since we may be in recovery - start them explicitly instead */ read_table(FALSE); startpoll(); startpms(); } /* * startpms - start initial set of port monitors */ void startpms() { struct sactab *sp; /* working pointer */ int rflag; /* recovery flag */ pid_t checklock(); /* * check to see if we're really a recovering SAC (if any port monitors hold * locks, assume that we're in recovery), if so, start differently */ rflag = 0; for (sp = Sactab; sp; sp = sp->sc_next) { if (checklock(sp)) { rflag = 1; sp->sc_sstate = sp->sc_pstate = UNKNOWN; sp->sc_ok = 1; sp->sc_exit = 0; (void) sprintf(Scratch, "%s/_pmpipe", sp->sc_tag); sp->sc_fd = open(Scratch, O_RDWR); if (sp->sc_fd < 0) { /* * if we get into here, we're in deep trouble. PM seems to be running * and we're trying to recover, but we can't talk to it. Unfortunately, * there's not much that can be done other than to try and restore a * sane state. By setting sp->sc_ok to 0, this will look like a poll failure * and if sp->rs_rsmax > 0, PM will be restarted. */ (void) sprintf(Scratch, "Could not open _pmpipe for port monitor <%s>", sp->sc_tag); log(Scratch); (void) sendsig(sp, SIGTERM); sp->sc_ok = 0; } } } if (rflag) { readutmpx(); log("SAC in recovery"); return; } /* * normal startup */ for (sp = Sactab; sp; sp = sp->sc_next) { if (sp->sc_flags & X_FLAG) { /* System Administator specified don't start */ continue; } (void) startpm(sp); } } /* * readutmpx - read the utmpx file to find out the ids of running port * monitors (only called during a recover start up). Note: * after a sac failure, init will inherit all of the port * monitors and should get the SIGCLD's if they die (and * will clean up). This is mainly for stuck processes, * although init would get the SIGCLD when the stuckie gets * killed, it doesn't hurt to have the sac check. This is * only done once. * */ void readutmpx() { struct sactab *sp; /* working pointer */ struct sactab *savesp; /* rembered port monitor match */ struct utmpx *uxp; /* working pointer */ setutxent(); while (uxp = getutxent()) { /* we're only interested in login processes */ if (uxp->ut_type != LOGIN_PROCESS) continue; if (uxp->ut_user[sizeof (uxp->ut_user) - 1] == '\0') { /* * possible port monitor and name is short enough to do a normal compare */ sp = findpm(uxp->ut_user); if (sp && (sp->sc_sstate == UNKNOWN)) { /* found one */ (void) memcpy(sp->sc_utid, uxp->ut_id, IDLEN); sp->sc_pid = uxp->ut_pid; } } else { /* * possible port monitor name, but it could have been truncated. If * a match is found on a unique prefix, then it should be the correct * entry. If an ambiguity is found, ignore the entry, init will clean * up the entry if it dies. */ savesp = NULL; for (sp = Sactab; sp; sp = sp->sc_next) { if (strncmp(uxp->ut_user, sp->sc_tag, sizeof (uxp->ut_user)) == 0) { if (savesp) { /* already found a match */ savesp = NULL; (void) sprintf(Scratch, "ambiguous utmpx entry <%.8s>", sp->sc_tag); log(Scratch); break; } else { savesp = sp; } } } if (savesp && (savesp->sc_sstate == UNKNOWN)) { /* found it */ (void) memcpy(savesp->sc_utid, uxp->ut_id, IDLEN); savesp->sc_pid = uxp->ut_pid; } } } endutxent(); } /* * startpm - start a particular PM, return code: * -1: _pid file locked * -2: any other reason * * args: sp - pointer to sac's port monitor information for * designated port monitor */ int startpm(struct sactab *sp) { sigset_t cset; /* for signal handling */ sigset_t tset; /* for signal handling */ pid_t pid; /* pid of new port monitor */ pid_t checklock(); #ifdef DEBUG debug("in startpm"); #endif if (checklock(sp)) { (void) sprintf(Scratch, "could not start <%s> - _pid file locked", sp->sc_tag); log(Scratch); return (-1); } (void) sprintf(Scratch, "%s/_pmpipe", sp->sc_tag); if (access(Scratch, 0) != 0) { /* not there, create one */ (void) umask(0); if (mknod(Scratch, S_IFIFO | 0600, 0) < 0) { (void) sprintf(Scratch, "Could not create _pmpipe for port monitor <%s>, errno is %d", sp->sc_tag, errno); log(Scratch); return (-2); } } sp->sc_fd = open(Scratch, O_RDWR); if (sp->sc_fd < 0) { (void) sprintf(Scratch, "Could not open _pmpipe for port monitor <%s>, errno is %d", sp->sc_tag, errno); log(Scratch); return (-2); } /* in case child dies too quickly */ (void) sigprocmask(SIG_SETMASK, NULL, &cset); tset = cset; (void) sigaddset(&tset, SIGCLD); (void) sigprocmask(SIG_SETMASK, &tset, NULL); if ((pid = fork()) < 0) { (void) sprintf(Scratch, "Could not fork port monitor <%s>", sp->sc_tag); log(Scratch); return (-2); } else if (!pid) { startit(sp); /* no return */ } /* * clean up old utmpx if its there */ cleanutx(sp); /* * create a utmpx entry and set initial states */ account(sp, pid); sp->sc_pstate = STARTING; if (sp->sc_lstate == NOTRUNNING) sp->sc_sstate = (sp->sc_flags & D_FLAG) ? DISABLED : ENABLED; else sp->sc_sstate = sp->sc_lstate; sp->sc_ok = 1; sp->sc_exit = 0; sp->sc_pid = pid; /* ok to take signals now that the table is up-to-table */ (void) sigprocmask(SIG_SETMASK, &cset, NULL); return (0); } /* * cleanutx - clean out a utmpx record for a port monitor * * args: sp - pointer to sac's port monitor information for * designated port monitor */ void cleanutx(struct sactab *sp) { int i; /* scratch variable */ int zerocheck; /* scratch variable */ char buf[SIZE]; /* scratch buffer */ pam_handle_t *pamh; /* PAM auth descriptor */ struct utmpx ut; struct utmpx *up; int pid; char user[sizeof (up->ut_user) + 1]; char ttyn[sizeof (up->ut_line) + 1]; char rhost[sizeof (up->ut_host) + 1]; /* * check to see if there is a utmpx entry to clean up (indicated by a non * zero utmpx id */ zerocheck = 0; for (i = 0; i < IDLEN; ++i) { zerocheck += sp->sc_utid[i]; } if (zerocheck == 0) return; pid = sp->sc_pid; setutxent(); while (up = getutxent()) { if (up->ut_pid == pid) { if (up->ut_type == DEAD_PROCESS) { /* * Cleaned up elsewhere. */ break; } strncpy(user, up->ut_user, sizeof (up->ut_user)); user[sizeof (up->ut_user)] = '\0'; strncpy(ttyn, up->ut_line, sizeof (up->ut_line)); ttyn[sizeof (up->ut_line)] = '\0'; strncpy(rhost, up->ut_host, sizeof (up->ut_host)); rhost[sizeof (up->ut_host)] = '\0'; if ((pam_start("sac", user, NULL, &pamh)) == PAM_SUCCESS) { (void) pam_set_item(pamh, PAM_TTY, ttyn); (void) pam_set_item(pamh, PAM_RHOST, rhost); (void) pam_close_session(pamh, 0); pam_end(pamh, PAM_SUCCESS); } up->ut_type = DEAD_PROCESS; up->ut_exit.e_termination = WTERMSIG(sp->sc_exit); up->ut_exit.e_exit = WEXITSTATUS(sp->sc_exit); if (sp->sc_utid != NULL) (void) memcpy(up->ut_id, sp->sc_utid, sizeof (up->ut_id)); (void) time(&up->ut_tv.tv_sec); if (modutx(up) == NULL) { /* * Since modutx failed we'll * write out the new entry * ourselves. */ (void) pututxline(up); updwtmpx("wtmpx", up); } break; } } endutxent(); } /* * account - create a utmp record for a port monitor * * args: pid - process id of port monitor */ void account(struct sactab *sp, pid_t pid) { struct utmpx utmpx; /* prototype utmpx entry */ struct utmpx *up = &utmpx; /* and a pointer to it */ (void) memset(up, '\0', sizeof (utmpx)); (void) strncpy(up->ut_user, sp->sc_tag, sizeof (up->ut_user)); up->ut_pid = pid; up->ut_type = LOGIN_PROCESS; up->ut_id[0] = 'P'; up->ut_id[1] = 'M'; up->ut_id[2] = SC_WILDC; up->ut_id[3] = SC_WILDC; (void) time(&up->ut_xtime); if (makeutx(up) == NULL) { log("Could not create utmpx entry"); (void) memset(sp->sc_utid, '\0', IDLEN); } else { (void) memcpy(sp->sc_utid, up->ut_id, IDLEN); } } /* * startit - finish starting a particular port monitor, establish environment, * etc. (Note: this is the child at this point) * * args: sp - pointer to sac's port monitor information for * designated port monitor */ void startit(struct sactab *sp) { static char istate[SIZE]; /* place to put ISTATE env var. */ static char pmtag[SIZE]; /* place to put PMTAG env var. */ char **argvp; /* arglist for PM */ int i; /* loop control variable */ long ndesc; /* # of file descriptors configured */ int ret; /* return value from doconfig */ sigset_t cset; /* for signal handling */ sigset_t tset; /* for signal handling */ /* * establish the home directory */ if (chdir(sp->sc_tag) < 0) { (void) sprintf(Scratch, "Cannot chdir to <%s/%s>, port monitor not started", HOME, sp->sc_tag); log(Scratch); exit(1); } /* * interpret the configuration script, pass an invalid fd, shouldn't be * doing pushes and pops in this script */ (void) sigprocmask(SIG_SETMASK, NULL, &cset); tset = cset; (void) sigaddset(&tset, SIGCLD); (void) sigprocmask(SIG_SETMASK, &tset, NULL); if ((ret = doconfig(-1, "_config", 0)) != 0) { if (ret == -1) { (void) sprintf(Scratch, "system error in _config script for <%s>", sp->sc_tag); log(Scratch); exit(1); } else { (void) sprintf(Scratch, "Error in _config script for <%s>: line %d", sp->sc_tag, ret); log(Scratch); exit(1); } } /* * add the promised environment variables */ if (sp->sc_lstate == NOTRUNNING) (void) sprintf(istate, "ISTATE=%s", (sp->sc_flags & D_FLAG) ? "disabled" : "enabled"); else (void) sprintf(istate, "ISTATE=%s", (sp->sc_lstate == DISABLED) ? "disabled" : "enabled"); if (putenv(istate)) { (void) sprintf(Scratch, "can't expand port monitor <%s> environment", sp->sc_tag); log(Scratch); exit(1); } (void) sprintf(pmtag, "PMTAG=%s", sp->sc_tag); if (putenv(pmtag)) { (void) sprintf(Scratch, "can't expand port monitor <%s> environment", sp->sc_tag); log(Scratch); exit(1); } /* * build an argv */ argvp = mkargv(sp); (void) sprintf(Scratch, "starting port monitor <%s>", sp->sc_tag); log(Scratch); ndesc = ulimit(4, 0L); for (i = 0; i < ndesc; i++) (void) fcntl(i, F_SETFD, 1); /* restore orignal handlers and mask */ (void) sigaction(SIGPOLL, &Sigpoll, NULL); (void) sigaction(SIGCLD, &Sigcld, NULL); (void) sigaction(SIGALRM, &Sigalrm, NULL); (void) sigprocmask(SIG_SETMASK, &Origmask, NULL); (void) execve(argvp[0], argvp, environ); (void) sprintf(Scratch, "exec of port monitor <%s> failed", sp->sc_tag); log(Scratch); exit(1); } /* * mkargv - Given a pointer to a struct sactab, construct argv * for an exec system call. * * args: sp - pointer to sac's port monitor information for * designated port montior */ #define NARGS 50 /* max # of args */ static char *newargv[NARGS]; /* place for argv list */ static char *delim = " \t'\""; /* delimiter list */ char ** mkargv(struct sactab *sp) { char **argvp = newargv; /* scratch pointer */ char *p = sp->sc_cmd; /* working pointer */ char delch; /* delimiter seen */ char *savep; /* scratch pointer */ char *tp; /* scratch pointer */ *argvp = 0; savep = p; while (p && *p) { if (p = strpbrk(p, delim)) { switch (*p) { case ' ': case '\t': /* "normal" cases */ *p++ = '\0'; *argvp++ = savep; /* zap trailing white space */ while (isspace(*p)) p++; savep = p; break; case '"': case '\'': /* found a string */ delch = *p; /* remember the delimiter */ savep = ++p; /* * We work the string in place, embedded instances of the string delimiter, * i.e. \" must have the '\' removed. Since we'd have to do a compare to * decide if a copy were needed, it's less work to just do the copy, even * though it is most likely unnecessary. */ tp = p; for (;;) { if (*p == '\0') { (void) sprintf(Scratch, "invalid command line, non-terminated string for port monitor %s", sp->sc_tag); log(Scratch); exit(1); } if (*p == delch) { if (*(tp - 1) == '\\') { /* \delim */ *(tp - 1) = *p; p++; } else { /* end of string */ *tp = 0; *argvp++ = savep; p++; /* zap trailing white space */ while (isspace(*p)) p++; savep = p; break; } } else { *tp++ = *p++; } } break; default: log("Internal error in parse routine"); exit(1); } } else *argvp++ = savep; } *argvp = 0; return (newargv); } /* * pollpms - send out sanity polls, if sc_sstate and sc_pstate are * the same (everyone agrees on the state) or if SAC thinks PM * should be stopping, send out a status message; * otherwise, send out a message indicating the state the SAC * thinks the PM should be entering */ void pollpms() { struct sactab *sp; /* working pointer */ struct sacmsg sacmsg; /* message to send to PM */ #ifdef DEBUG debug("alarm went off"); #endif for (sp = Sactab; sp; sp = sp->sc_next) { if (sp->sc_pstate == NOTRUNNING || sp->sc_pstate == FAILED) { /* don't bother if no one is home */ continue; } if (sp->sc_ok == 0) { /* PM has stopped responding */ pollfail(sp, RESP); continue; } /* * note - if we're in recovery, a SC_STATUS message is sent * (sc_sstate = UNKNOWN and sc_pstate = UNKNOWN) */ if (sp->sc_sstate == sp->sc_pstate) { sacmsg.sc_type = SC_STATUS; sacmsg.sc_size = 0; } else { switch (sp->sc_sstate) { case ENABLED: sacmsg.sc_type = SC_ENABLE; sacmsg.sc_size = 0; break; case DISABLED: sacmsg.sc_type = SC_DISABLE; sacmsg.sc_size = 0; break; case STARTING: case STOPPING: case NOTRUNNING: case FAILED: case UNKNOWN: /* * if NOTRUNNING or FAILED, PM will probably * not respond to poll, that's how we detect * that it's gone */ sacmsg.sc_type = SC_STATUS; sacmsg.sc_size = 0; break; default: error(E_BADSTATE, EXIT); } } /* send the message */ sendpmmsg(sp, &sacmsg); sp->sc_ok = 0; } (void) alarm(Stime); } /* * reap - clean up dead children, equivalent to a "fast" poll failure * * args: signo - signal # */ void reap(int signo) { struct sactab *sp; /* working pointer */ pid_t pid; /* returned pid from wait */ int status; /* returned status from wait */ pid = wait(&status); for (sp = Sactab; sp; sp = sp->sc_next) { if (sp->sc_pid == pid) break; } if (sp == NULL) { /* not from a port monitor we know about */ return; } sp->sc_exit = status; /* only call pollfail for "stuck" and stopping processes */ if (sp->sc_pstate != NOTRUNNING && sp->sc_pstate != FAILED) pollfail(sp, DEATH); } /* * pollfail - handle the case where a PM stops responding to a sanity poll * * args: sp - pointer to sac's port monitor information for * designated port monitor * reason - RESP or DEATH (indicates why pollfail called) */ void pollfail(struct sactab *sp, int reason) { char buf[SIZE]; /* scratch buffer */ sigset_t cset; /* for signal handling */ sigset_t tset; /* for signal handling */ #ifdef DEBUG debug("in pollfail"); #endif /* first, remove the utmpx entry and clean up any links */ cleanutx(sp); if (sp->sc_pstate == STOPPING) { (void) sprintf(buf, "<%s> has stopped", sp->sc_tag); log(buf); sp->sc_pstate = NOTRUNNING; sp->sc_lstate = NOTRUNNING; (void) close(sp->sc_fd); } else { /* * PM in trouble - if it's still there, try to put it out of its misery * We play with SIGCLD here to that after SIGKILL is sent, the catcher * routine reap() is not called until we're ready (note: when a catcher * is established for SIGCLD and any zombies are present, the signal is * immediately received) */ (void) sigprocmask(SIG_SETMASK, NULL, &cset); tset = cset; (void) sigaddset(&tset, SIGCLD); (void) sigprocmask(SIG_SETMASK, &tset, NULL); (void) sendsig(sp, SIGKILL); if (sp->sc_rscnt < sp->sc_rsmax) { /* try to restart it */ if (reason == RESP) (void) sprintf(buf, "<%s> stopped responding to sanity polls - trying to restart", sp->sc_tag); else (void) sprintf(buf, "<%s> has died - trying to restart", sp->sc_tag); log(buf); sp->sc_rscnt++; (void) close(sp->sc_fd); (void) startpm(sp); } else { sp->sc_sstate = sp->sc_pstate = FAILED; (void) close(sp->sc_fd); (void) sprintf(buf, "<%s> has FAILED", sp->sc_tag); log(buf); } } (void) sigprocmask(SIG_SETMASK, &cset, NULL); } /* * readpipe - read messages from _sacpipe */ void readpipe() { struct pmmsg pmmsg; /* incoming message */ struct pmmsg *pp = &pmmsg; /* and a pointer to it */ struct sactab *sp; /* working pointer */ int ret; /* return value from read */ /* * This routine's main purpose is to maintain the state associated with * each of the known port monitors. Because it may be confusing, following * is a brief discussion of what is happening. Three different views of * a port monitor's state exist: sc_sstate, sc_pstate, and sc_lstate. * sc_sstate is the state in which the sac has been instructed to place * a port monitor. sc_lstate is essentially a shadow of this field, however, * it will only take on the values ENABLED, DISABLED, and NOTRUNNING. * sc_lstate is used if a port monitor dies to restart it in the state in * which it was last running. sc_pstate is the last state that the port * monitor reported itself in. Note that if the administrator specifies * a state change, there is a window where sc_sstate and sc_pstate will * be different (until the port monitor enacts and acknowledges the change). * * These states interact with the polling loop to determine which message * should be sent to a port monitor. If the states agree, an SC_STATUS * is sent. If they disagree, the appropriate message to put the port * monitor in the correct state is sent (SC_ENABLE or SC_DISABLE). sc_pstate * is the state that is reported back to an AC_STATUS request. Finally, * when in recovery (sc_sstate and sc_pstate both = UNKNOWN), the sac will * take the port monitor's reported state as the true state. This is the * only instance in which a port monitor can cause sc_sstate to change. */ for (;;) { if (read(Sfd, pp, sizeof (pmmsg)) < 0) { if (errno != EINTR) error(E_BADREAD, EXIT); continue; } while (pp->pm_size) { /* * there's data after the header, unfortunately, we don't understand * any of it because only class 1 (no data) messages are defined. Just * flush it */ ret = read(Sfd, Scratch, (pp->pm_size > SIZE) ? (unsigned) SIZE : (unsigned) pp->pm_size); if (ret < 0) { if (errno != EINTR) error(E_BADREAD, EXIT); continue; } else pp->pm_size -= ret; } sp = findpm(pp->pm_tag); if (sp == NULL) { log("message from unknown process"); continue; } switch (pp->pm_type) { case PM_UNKNOWN: (void) sprintf(Scratch, "port monitor <%s> didn't recognize message", sp->sc_tag); log(Scratch); /* fall through */ case PM_STATUS: /* * paranoia check, if port monitor reports garbage * state, pretend it said UNKNOWN */ if (!validstate(pp->pm_state)) { pp->pm_state = UNKNOWN; (void) sprintf(Scratch, "port monitor <%s> reporting invalid state", sp->sc_tag); log(Scratch); } if (sp->sc_sstate == sp->sc_pstate) { /* everyone agrees on the current state */ if (sp->sc_sstate == UNKNOWN) { /* special case for recovery */ sp->sc_sstate = pp->pm_state; sp->sc_pstate = pp->pm_state; if (pp->pm_state == ENABLED || pp->pm_state == DISABLED) /* sc_lstate NOTRUNNING by default */ sp->sc_lstate = pp->pm_state; } if (pp->pm_state != sp->sc_pstate) { /* * something isn't right here, PM * changed state without orders, try * to restore to correct state */ sp->sc_pstate = pp->pm_state; } } else if (sp->sc_sstate == pp->pm_state) { /* PM changed to state requested */ (void) sprintf(Scratch, "port monitor <%s> changed state from %s to %s", sp->sc_tag, pstate(sp->sc_pstate), pstate(pp->pm_state)); log(Scratch); sp->sc_pstate = pp->pm_state; } else if (sp->sc_pstate != pp->pm_state) { /* * something isn't right here, PM isn't * in the state it was, nor is it in the * state we just tried to put it in, try * to restore to correct state if we should */ if (sp->sc_pstate != STOPPING) sp->sc_pstate = pp->pm_state; } break; default: (void) sprintf(Scratch, "port monitor <%s> sent an invalid message - ignoring it", sp->sc_tag); log(Scratch); break; } /* no matter what, PM did answer the poll */ sp->sc_ok = 1; /* Note the messages it understands */ sp->sc_maxclass = pp->pm_maxclass; } } /* * validstate - determine if arg s a valid return state from a port monitor * return 1 if ok, 0 otherwise * * args: state - state to be verified */ int validstate(unchar state) { switch (state) { case PM_ENABLED: case PM_DISABLED: case PM_STARTING: case PM_STOPPING: return (1); default: return (0); } } /* * mk_cmd_pipe - create the command pipe used by sacadm */ int mk_cmd_pipe() { int fds[2]; /* pipe endpoints */ int fd; /* scratch file descriptor */ /* make sure there is a file here to mount on */ (void) unlink(CMDPIPE); fd = open(CMDPIPE, O_RDWR | O_CREAT, 0600); if (fd < 0) error(E_CMDPIPE, EXIT); close(fd); if (pipe(fds) < 0) error(E_PIPE, EXIT); if (fattach(fds[0], CMDPIPE) < 0) error(E_FATTACH, EXIT); return (fds[1]); } /* * startpoll - enable polling on command pipe by setting up to catch SIGPOLL */ void startpoll() { struct sigaction sigact; /* for signal handling */ if (ioctl(Cfd, I_SETSIG, S_INPUT) < 0) error(E_SETSIG, EXIT); sigact.sa_flags = 0; sigact.sa_handler = sigpoll; (void) sigemptyset(&sigact.sa_mask); (void) sigaddset(&sigact.sa_mask, SIGPOLL); (void) sigaction(SIGPOLL, &sigact, &Sigpoll); }