2 Copyright (c) 2004 The Regents of the University of Michigan.
5 Redistribution and use in source and binary forms, with or without
6 modification, are permitted provided that the following conditions
9 1. Redistributions of source code must retain the above copyright
10 notice, this list of conditions and the following disclaimer.
11 2. Redistributions in binary form must reproduce the above copyright
12 notice, this list of conditions and the following disclaimer in the
13 documentation and/or other materials provided with the distribution.
14 3. Neither the name of the University nor the names of its
15 contributors may be used to endorse or promote products derived
16 from this software without specific prior written permission.
18 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
19 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
20 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
22 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
23 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
24 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
25 BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
26 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
27 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
28 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
34 #include <sys/param.h>
35 #include <sys/socket.h>
37 #include <netinet/in.h>
55 extern struct pollfd *pollarray;
58 #define POLL_MILLISECS 500
60 static volatile int dir_changed = 1;
62 static void dir_notify_handler(int sig, siginfo_t *si, void *data)
68 scan_poll_results(int ret)
71 struct clnt_info *clp;
73 for (clp = clnt_list_first_entry(); clp != NULL; clp = clp->list.tqe_next)
75 i = clp->krb5_poll_index;
76 if (i >= 0 && pollarray[i].revents) {
77 if (pollarray[i].revents & POLLHUP)
79 if (pollarray[i].revents & POLLIN)
80 handle_krb5_upcall(clp);
81 pollarray[clp->krb5_poll_index].revents = 0;
86 i = clp->spkm3_poll_index;
87 if (i >= 0 && pollarray[i].revents) {
88 if (pollarray[i].revents & POLLHUP)
90 pollarray[clp->spkm3_poll_index].revents = 0;
102 struct sigaction dn_act;
104 time_t child_check = 0;
107 /* Taken from linux/Documentation/dnotify.txt: */
108 dn_act.sa_sigaction = dir_notify_handler;
109 sigemptyset(&dn_act.sa_mask);
110 dn_act.sa_flags = SA_SIGINFO;
111 sigaction(DNOTIFY_SIGNAL, &dn_act, NULL);
113 if ((fd = open(pipefs_dir, O_RDONLY)) == -1) {
114 printerr(0, "ERROR: failed to open %s: %s\n",
115 pipefs_dir, strerror(errno));
118 fcntl(fd, F_SETSIG, DNOTIFY_SIGNAL);
119 fcntl(fd, F_NOTIFY, DN_CREATE|DN_DELETE|DN_MODIFY|DN_MULTISHOT);
124 while (dir_changed) {
126 printerr(2, "pipefs root dir changed\n");
127 if (update_client_list()) {
128 printerr(0, "ERROR: couldn't update "
134 /* every 5s cleanup possible zombies of child processes */
135 if (time(NULL) - child_check >= 5) {
136 printerr(3, "check zombie children...\n");
139 child_pid = waitpid(-1, NULL, WNOHANG);
143 printerr(2, "terminate zombie child: %d\n",
147 child_check = time(NULL);
150 /* race condition here: dir_changed could be set before we
151 * enter the poll, and we'd never notice if it weren't for the
153 ret = poll(pollarray, pollsize, POLL_MILLISECS);
157 "WARNING: error return from poll\n");
158 } else if (ret == 0) {
160 } else { /* ret > 0 */
161 scan_poll_results(ret);