623 lines
16 KiB
C
623 lines
16 KiB
C
/* $NetBSD: amd.c,v 1.8 2005/04/23 18:38:17 christos Exp $ */
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/*
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* Copyright (c) 1997-2005 Erez Zadok
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* Copyright (c) 1989 Jan-Simon Pendry
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* Copyright (c) 1989 Imperial College of Science, Technology & Medicine
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* Copyright (c) 1989 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Jan-Simon Pendry at Imperial College, London.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgment:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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*
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* Id: amd.c,v 1.35 2005/03/08 06:05:33 ezk Exp
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*
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*/
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/*
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* Automounter
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif /* HAVE_CONFIG_H */
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#include <am_defs.h>
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#include <amd.h>
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struct amu_global_options gopt; /* where global options are stored */
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char pid_fsname[16 + MAXHOSTNAMELEN]; /* "kiska.southseas.nz:(pid%d)" */
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char *hostdomain = "unknown.domain";
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char hostd[2 * MAXHOSTNAMELEN + 1]; /* Host+domain */
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char *endian = ARCH_ENDIAN; /* Big or Little endian */
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char *cpu = HOST_CPU; /* CPU type */
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char *PrimNetName; /* name of primary network */
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char *PrimNetNum; /* number of primary network */
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int immediate_abort; /* Should close-down unmounts be retried */
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int orig_umask = 022;
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int select_intr_valid;
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jmp_buf select_intr;
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struct amd_stats amd_stats; /* Server statistics */
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struct in_addr myipaddr; /* (An) IP address of this host */
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time_t do_mapc_reload = 0; /* mapc_reload() call required? */
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#ifdef HAVE_FS_AUTOFS
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int amd_use_autofs = 0;
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#endif /* HAVE_FS_AUTOFS */
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#ifdef HAVE_SIGACTION
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sigset_t masked_sigs;
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#endif /* HAVE_SIGACTION */
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/*
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* Signal handler:
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* SIGINT - tells amd to do a full shutdown, including unmounting all
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* filesystem.
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* SIGTERM - tells amd to shutdown now. Just unmounts the automount nodes.
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*/
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static RETSIGTYPE
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sigterm(int sig)
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{
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#ifdef REINSTALL_SIGNAL_HANDLER
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signal(sig, sigterm);
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#endif /* REINSTALL_SIGNAL_HANDLER */
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switch (sig) {
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case SIGINT:
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immediate_abort = 15;
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break;
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case SIGTERM:
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immediate_abort = -1;
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/* fall through... */
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default:
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plog(XLOG_WARNING, "WARNING: automounter going down on signal %d", sig);
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break;
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}
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if (select_intr_valid)
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longjmp(select_intr, sig);
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}
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/*
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* Hook for cache reload.
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* When a SIGHUP arrives it schedules a call to mapc_reload
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*/
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static RETSIGTYPE
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sighup(int sig)
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{
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#ifdef REINSTALL_SIGNAL_HANDLER
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signal(sig, sighup);
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#endif /* REINSTALL_SIGNAL_HANDLER */
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if (sig != SIGHUP)
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dlog("spurious call to sighup");
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/*
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* Force a reload by zero'ing the timer
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*/
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if (amd_state == Run)
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do_mapc_reload = 0;
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}
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static RETSIGTYPE
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parent_exit(int sig)
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{
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/*
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* This signal handler is called during Amd initialization. The parent
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* forks a child to do all the hard automounting work, and waits for a
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* SIGQUIT signal from the child. When the parent gets the signal it's
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* supposed to call this handler and exit(3), thus completing the
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* daemonizing process. Alas, on some systems, especially Linux 2.4/2.6
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* with Glibc, exit(3) doesn't always terminate the parent process.
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* Worse, the parent process now refuses to accept any more SIGQUIT
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* signals -- they are blocked. What's really annoying is that this
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* doesn't happen all the time, suggesting a race condition somewhere.
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* (This happens even if I change the logic to use another signal.) I
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* traced this to something which exit(3) does in addition to exiting the
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* process, probably some atexit() stuff or other side-effects related to
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* signal handling. Either way, since at this stage the parent process
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* just needs to terminate, I'm simply calling _exit(2). Note also that
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* the OpenGroup doesn't list exit(3) as a recommended "Base Interface"
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* but they do list _exit(2) as one. This fix seems to work reliably all
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* the time. -Erez (2/27/2005)
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*/
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_exit(0);
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}
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static int
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daemon_mode(void)
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{
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int bgpid;
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#ifdef HAVE_SIGACTION
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struct sigaction sa, osa;
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memset(&sa, 0, sizeof(sa));
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sa.sa_handler = parent_exit;
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sa.sa_flags = 0;
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sigemptyset(&(sa.sa_mask));
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sigaddset(&(sa.sa_mask), SIGQUIT);
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sigaction(SIGQUIT, &sa, &osa);
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#else /* not HAVE_SIGACTION */
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signal(SIGQUIT, parent_exit);
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#endif /* not HAVE_SIGACTION */
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bgpid = background();
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if (bgpid != 0) {
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/*
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* Now wait for the automount points to
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* complete.
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*/
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for (;;)
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pause();
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/* should never reach here */
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}
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#ifdef HAVE_SIGACTION
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sigaction(SIGQUIT, &osa, NULL);
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#else /* not HAVE_SIGACTION */
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signal(SIGQUIT, SIG_DFL);
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#endif /* not HAVE_SIGACTION */
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/*
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* Record our pid to make it easier to kill the correct amd.
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*/
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if (gopt.flags & CFM_PRINT_PID) {
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if (STREQ(gopt.pid_file, "/dev/stdout")) {
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printf("%ld\n", (long) am_mypid);
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/* flush stdout, just in case */
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fflush(stdout);
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} else {
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FILE *f;
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mode_t prev_umask = umask(0022); /* set secure temporary umask */
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f = fopen(gopt.pid_file, "w");
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if (f) {
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fprintf(f, "%ld\n", (long) am_mypid);
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(void) fclose(f);
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} else {
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fprintf(stderr, "cannot open %s (errno=%d)\n", gopt.pid_file, errno);
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}
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umask(prev_umask); /* restore umask */
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}
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}
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/*
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* Pretend we are in the foreground again
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*/
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foreground = 1;
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/*
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* Dissociate from the controlling terminal
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*/
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amu_release_controlling_tty();
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return getppid();
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}
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/*
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* Initialize global options structure.
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*/
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static void
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init_global_options(void)
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{
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#if defined(HAVE_SYS_UTSNAME_H) && defined(HAVE_UNAME)
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static struct utsname un;
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#endif /* defined(HAVE_SYS_UTSNAME_H) && defined(HAVE_UNAME) */
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int i;
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memset(&gopt, 0, sizeof(struct amu_global_options));
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/* name of current architecture */
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gopt.arch = HOST_ARCH;
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/* automounter temp dir */
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gopt.auto_dir = "/a";
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/* toplevel attribute cache timeout */
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gopt.auto_attrcache = 0;
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/* cluster name */
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gopt.cluster = NULL;
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/* executable map timeout */
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gopt.exec_map_timeout = AMFS_EXEC_MAP_TIMEOUT;
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/*
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* kernel architecture: this you must get from uname() if possible.
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*/
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#if defined(HAVE_SYS_UTSNAME_H) && defined(HAVE_UNAME)
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if (uname(&un) >= 0)
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gopt.karch = un.machine;
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else
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#endif /* defined(HAVE_SYS_UTSNAME_H) && defined(HAVE_UNAME) */
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gopt.karch = HOST_ARCH;
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/* amd log file */
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gopt.logfile = NULL;
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/* operating system name */
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gopt.op_sys = HOST_OS_NAME;
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/* OS version */
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gopt.op_sys_ver = HOST_OS_VERSION;
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/* full OS name and version */
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gopt.op_sys_full = HOST_OS;
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/* OS version */
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gopt.op_sys_vendor = HOST_VENDOR;
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/* pid file */
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gopt.pid_file = "/dev/stdout";
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/* local domain */
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gopt.sub_domain = NULL;
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/* reset NFS retransmit counter and retry interval */
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for (i=0; i<AMU_TYPE_MAX; ++i) {
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gopt.amfs_auto_retrans[i] = -1;
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gopt.amfs_auto_timeo[i] = -1;
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}
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/* cache duration */
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gopt.am_timeo = AM_TTL;
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/* dismount interval */
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gopt.am_timeo_w = AM_TTL_W;
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/* map reload intervl */
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gopt.map_reload_interval = ONE_HOUR;
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/*
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* various CFM_* flags that are on by default.
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*/
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gopt.flags = CFM_DEFAULT_FLAGS;
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#ifdef HAVE_MAP_HESIOD
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/* Hesiod rhs zone */
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gopt.hesiod_base = "automount";
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#endif /* HAVE_MAP_HESIOD */
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#ifdef HAVE_MAP_LDAP
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/* LDAP base */
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gopt.ldap_base = NULL;
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/* LDAP host ports */
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gopt.ldap_hostports = NULL;
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/* LDAP cache */
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gopt.ldap_cache_seconds = 0;
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gopt.ldap_cache_maxmem = 131072;
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/* LDAP protocol version */
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gopt.ldap_proto_version = 2;
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#endif /* HAVE_MAP_LDAP */
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#ifdef HAVE_MAP_NIS
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/* YP domain name */
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gopt.nis_domain = NULL;
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#endif /* HAVE_MAP_NIS */
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}
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/*
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* Lock process text and data segment in memory (after forking the daemon)
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*/
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static void
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do_memory_locking(void)
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{
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#if defined(HAVE_PLOCK) || defined(HAVE_MLOCKALL)
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int locked_ok = 0;
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#else /* not HAVE_PLOCK and not HAVE_MLOCKALL */
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plog(XLOG_WARNING, "Process memory locking not supported by the OS");
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#endif /* not HAVE_PLOCK and not HAVE_MLOCKALL */
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#ifdef HAVE_PLOCK
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# ifdef _AIX
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/*
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* On AIX you must lower the stack size using ulimit() before calling
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* plock. Otherwise plock will reserve a lot of memory space based on
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* your maximum stack size limit. Since it is not easily possible to
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* tell what should the limit be, I print a warning before calling
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* plock(). See the manual pages for ulimit(1,3,4) on your AIX system.
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*/
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plog(XLOG_WARNING, "AIX: may need to lower stack size using ulimit(3) before calling plock");
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# endif /* _AIX */
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if (!locked_ok && plock(PROCLOCK) != 0)
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plog(XLOG_WARNING, "Couldn't lock process pages in memory using plock(): %m");
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else
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locked_ok = 1;
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#endif /* HAVE_PLOCK */
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#ifdef HAVE_MLOCKALL
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if (!locked_ok && mlockall(MCL_CURRENT|MCL_FUTURE) != 0)
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plog(XLOG_WARNING, "Couldn't lock process pages in memory using mlockall(): %m");
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else
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locked_ok = 1;
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#endif /* HAVE_MLOCKALL */
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#if defined(HAVE_PLOCK) || defined(HAVE_MLOCKALL)
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if (locked_ok)
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plog(XLOG_INFO, "Locked process pages in memory");
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#endif /* HAVE_PLOCK || HAVE_MLOCKALL */
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#if defined(HAVE_MADVISE) && defined(MADV_PROTECT)
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madvise(0, 0, MADV_PROTECT); /* may be redundant of the above worked out */
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#endif /* defined(HAVE_MADVISE) && defined(MADV_PROTECT) */
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}
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int
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main(int argc, char *argv[])
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{
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char *domdot, *verstr;
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int ppid = 0;
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int error;
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char *progname = NULL; /* "amd" */
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char hostname[MAXHOSTNAMELEN + 1] = "localhost"; /* Hostname */
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#ifdef HAVE_SIGACTION
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struct sigaction sa;
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#endif /* HAVE_SIGACTION */
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/*
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* Make sure some built-in assumptions are true before we start
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*/
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assert(sizeof(nfscookie) >= sizeof(u_int));
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assert(sizeof(int) >= 4);
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/*
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* Set processing status.
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*/
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amd_state = Start;
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/*
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* Determine program name
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*/
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if (argv[0]) {
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progname = strrchr(argv[0], '/');
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if (progname && progname[1])
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progname++;
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else
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progname = argv[0];
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}
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if (!progname)
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progname = "amd";
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am_set_progname(progname);
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/*
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* Initialize process id. This is kept
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* cached since it is used for generating
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* and using file handles.
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*/
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am_set_mypid();
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/*
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* Get local machine name
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*/
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if (gethostname(hostname, sizeof(hostname)) < 0) {
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plog(XLOG_FATAL, "gethostname: %m");
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going_down(1);
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}
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hostname[sizeof(hostname) - 1] = '\0';
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/*
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* Check it makes sense
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*/
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if (!*hostname) {
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plog(XLOG_FATAL, "host name is not set");
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going_down(1);
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}
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/*
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* Initialize global options structure.
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*/
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init_global_options();
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/*
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* Partially initialize hostd[]. This
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* is completed in get_args().
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*/
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if ((domdot = strchr(hostname, '.'))) {
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/*
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* Hostname already contains domainname.
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* Split out hostname and domainname
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* components
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*/
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*domdot++ = '\0';
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hostdomain = domdot;
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}
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strlcpy(hostd, hostname, sizeof(hostd));
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am_set_hostname(hostname);
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/*
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* Trap interrupts for shutdowns.
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*/
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#ifdef HAVE_SIGACTION
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memset(&sa, 0, sizeof(sa));
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sa.sa_handler = sigterm;
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sa.sa_flags = 0;
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sigemptyset(&(sa.sa_mask));
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sigaddset(&(sa.sa_mask), SIGINT);
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sigaddset(&(sa.sa_mask), SIGTERM);
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sigaction(SIGINT, &sa, NULL);
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sigaction(SIGTERM, &sa, NULL);
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#else /* not HAVE_SIGACTION */
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(void) signal(SIGINT, sigterm);
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#endif /* not HAVE_SIGACTION */
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/*
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* Trap Terminate so that we can shutdown gracefully (some chance)
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*/
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#ifdef HAVE_SIGACTION
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sa.sa_handler = sigterm;
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sa.sa_flags = 0;
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sigemptyset(&(sa.sa_mask));
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sigaddset(&(sa.sa_mask), SIGTERM);
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sigaction(SIGTERM, &sa, NULL);
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#else /* not HAVE_SIGACTION */
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(void) signal(SIGTERM, sigterm);
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#endif /* not HAVE_SIGACTION */
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/*
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* Hangups tell us to reload the cache
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*/
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#ifdef HAVE_SIGACTION
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sa.sa_handler = sighup;
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sa.sa_flags = 0;
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sigemptyset(&(sa.sa_mask));
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sigaddset(&(sa.sa_mask), SIGHUP);
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sigaction(SIGHUP, &sa, NULL);
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#else /* not HAVE_SIGACTION */
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(void) signal(SIGHUP, sighup);
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#endif /* not HAVE_SIGACTION */
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/*
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* Trap Death-of-a-child. These allow us to
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* pick up the exit status of backgrounded mounts.
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* See "sched.c".
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*/
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#ifdef HAVE_SIGACTION
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sa.sa_handler = sigchld;
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sa.sa_flags = 0;
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sigemptyset(&(sa.sa_mask));
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sigaddset(&(sa.sa_mask), SIGCHLD);
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sigaction(SIGCHLD, &sa, NULL);
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/*
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* construct global "masked_sigs" used in nfs_start.c
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*/
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sigemptyset(&masked_sigs);
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sigaddset(&masked_sigs, SIGHUP);
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sigaddset(&masked_sigs, SIGCHLD);
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sigaddset(&masked_sigs, SIGTERM);
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sigaddset(&masked_sigs, SIGINT);
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#else /* not HAVE_SIGACTION */
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(void) signal(SIGCHLD, sigchld);
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#endif /* not HAVE_SIGACTION */
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/*
|
|
* Fix-up any umask problems. Most systems default
|
|
* to 002 which is not too convenient for our purposes
|
|
*/
|
|
orig_umask = umask(0);
|
|
|
|
/*
|
|
* Figure out primary network name
|
|
*/
|
|
getwire(&PrimNetName, &PrimNetNum);
|
|
|
|
/*
|
|
* Determine command-line arguments
|
|
*/
|
|
get_args(argc, argv);
|
|
|
|
/*
|
|
* Log version information.
|
|
*/
|
|
verstr = strtok(get_version_string(), "\n");
|
|
plog(XLOG_INFO, "AM-UTILS VERSION INFORMATION:");
|
|
while (verstr) {
|
|
plog(XLOG_INFO, "%s", verstr);
|
|
verstr = strtok(NULL, "\n");
|
|
}
|
|
|
|
/*
|
|
* Get our own IP address so that we can mount the automounter. We pass
|
|
* localhost_address which could be used as the default localhost
|
|
* name/address in amu_get_myaddress().
|
|
*/
|
|
amu_get_myaddress(&myipaddr, gopt.localhost_address);
|
|
plog(XLOG_INFO, "My ip addr is %s", inet_ntoa(myipaddr));
|
|
|
|
/* avoid hanging on other NFS servers if started elsewhere */
|
|
if (chdir("/") < 0)
|
|
plog(XLOG_INFO, "cannot chdir to /: %m");
|
|
|
|
/*
|
|
* Now check we are root.
|
|
*/
|
|
if (geteuid() != 0) {
|
|
plog(XLOG_FATAL, "Must be root to mount filesystems (euid = %ld)", (long) geteuid());
|
|
going_down(1);
|
|
}
|
|
|
|
#ifdef HAVE_MAP_NIS
|
|
/*
|
|
* If the domain was specified then bind it here
|
|
* to circumvent any default bindings that may
|
|
* be done in the C library.
|
|
*/
|
|
if (gopt.nis_domain && yp_bind(gopt.nis_domain)) {
|
|
plog(XLOG_FATAL, "Can't bind to NIS domain \"%s\"", gopt.nis_domain);
|
|
going_down(1);
|
|
}
|
|
#endif /* HAVE_MAP_NIS */
|
|
|
|
if (!amuDebug(D_DAEMON))
|
|
ppid = daemon_mode();
|
|
|
|
/*
|
|
* Lock process text and data segment in memory.
|
|
*/
|
|
if (gopt.flags & CFM_PROCESS_LOCK) {
|
|
do_memory_locking();
|
|
}
|
|
|
|
do_mapc_reload = clocktime() + gopt.map_reload_interval;
|
|
|
|
/*
|
|
* Register automounter with system.
|
|
*/
|
|
error = mount_automounter(ppid);
|
|
if (error && ppid)
|
|
kill(ppid, SIGALRM);
|
|
|
|
#ifdef HAVE_FS_AUTOFS
|
|
/*
|
|
* XXX this should be part of going_down(), but I can't move it there
|
|
* because it would be calling non-library code from the library... ugh
|
|
*/
|
|
if (amd_use_autofs)
|
|
destroy_autofs_service();
|
|
#endif /* HAVE_FS_AUTOFS */
|
|
|
|
going_down(error);
|
|
|
|
abort();
|
|
return 1; /* should never get here */
|
|
}
|