4 * Copyright (C) 2004-2005 Kay Sievers <kay.sievers@vrfy.org>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation version 2 of the License.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 675 Mass Ave, Cambridge, MA 02139, USA.
29 #include <sys/socket.h>
31 #include <sys/select.h>
32 #include <linux/types.h>
33 #include <linux/netlink.h>
38 static int uevent_netlink_sock;
39 static int udev_monitor_sock;
40 static volatile int udev_exit;
42 static int init_udev_monitor_socket(void)
44 struct sockaddr_un saddr;
46 const int feature_on = 1;
49 memset(&saddr, 0x00, sizeof(saddr));
50 saddr.sun_family = AF_LOCAL;
51 /* use abstract namespace for socket path */
52 strcpy(&saddr.sun_path[1], "/org/kernel/udev/monitor");
53 addrlen = offsetof(struct sockaddr_un, sun_path) + strlen(saddr.sun_path+1) + 1;
55 udev_monitor_sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
56 if (udev_monitor_sock == -1) {
57 fprintf(stderr, "error getting socket: %s\n", strerror(errno));
61 /* the bind takes care of ensuring only one copy running */
62 retval = bind(udev_monitor_sock, (struct sockaddr *) &saddr, addrlen);
64 fprintf(stderr, "bind failed: %s\n", strerror(errno));
65 close(udev_monitor_sock);
66 udev_monitor_sock = -1;
70 /* enable receiving of the sender credentials */
71 setsockopt(udev_monitor_sock, SOL_SOCKET, SO_PASSCRED, &feature_on, sizeof(feature_on));
76 static int init_uevent_netlink_sock(void)
78 struct sockaddr_nl snl;
81 memset(&snl, 0x00, sizeof(struct sockaddr_nl));
82 snl.nl_family = AF_NETLINK;
83 snl.nl_pid = getpid();
84 snl.nl_groups = 0xffffffff;
86 uevent_netlink_sock = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
87 if (uevent_netlink_sock == -1) {
88 fprintf(stderr, "error getting socket: %s\n", strerror(errno));
92 retval = bind(uevent_netlink_sock, (struct sockaddr *) &snl,
93 sizeof(struct sockaddr_nl));
95 fprintf(stderr, "bind failed: %s\n", strerror(errno));
96 close(uevent_netlink_sock);
97 uevent_netlink_sock = -1;
104 static void asmlinkage sig_handler(int signum)
106 if (signum == SIGINT || signum == SIGTERM)
110 int main(int argc, char *argv[])
112 struct sigaction act;
118 for (i = 1 ; i < argc; i++) {
120 if (strcmp(arg, "--env") == 0 || strcmp(arg, "-e") == 0) {
123 else if (strcmp(arg, "--help") == 0 || strcmp(arg, "-h") == 0){
124 printf("Usage: udevmonitor [--env]\n"
125 " --env print the whole event environment\n"
126 " --help print this help text\n\n");
129 fprintf(stderr, "unknown option\n\n");
135 fprintf(stderr, "need to be root, exit\n\n");
139 /* set signal handlers */
140 memset(&act, 0x00, sizeof(struct sigaction));
141 act.sa_handler = (void (*)(int)) sig_handler;
142 sigemptyset(&act.sa_mask);
143 act.sa_flags = SA_RESTART;
144 sigaction(SIGINT, &act, NULL);
145 sigaction(SIGTERM, &act, NULL);
147 retval = init_udev_monitor_socket();
150 retval = init_uevent_netlink_sock();
154 printf("udevmonitor prints the received event from the kernel [UEVENT]\n"
155 "and the event which udev sends out after rule processing [UDEV]\n\n");
158 static char buf[UEVENT_BUFFER_SIZE*2];
167 if (uevent_netlink_sock > 0)
168 FD_SET(uevent_netlink_sock, &readfds);
169 if (udev_monitor_sock > 0)
170 FD_SET(udev_monitor_sock, &readfds);
172 fdcount = select(UDEV_MAX(uevent_netlink_sock, udev_monitor_sock)+1, &readfds, NULL, NULL, NULL);
175 fprintf(stderr, "error receiving uevent message: %s\n", strerror(errno));
179 if (gettimeofday(&tv, &tz) == 0) {
180 snprintf(timestr, sizeof(timestr), "%llu.%06u",
181 (unsigned long long) tv.tv_sec, (unsigned int) tv.tv_usec);
185 if ((uevent_netlink_sock > 0) && FD_ISSET(uevent_netlink_sock, &readfds)) {
186 buflen = recv(uevent_netlink_sock, &buf, sizeof(buf), 0);
188 fprintf(stderr, "error receiving uevent message: %s\n", strerror(errno));
191 printf("UEVENT[%s] %s\n", timestr, buf);
194 if ((udev_monitor_sock > 0) && FD_ISSET(udev_monitor_sock, &readfds)) {
195 buflen = recv(udev_monitor_sock, &buf, sizeof(buf), 0);
197 fprintf(stderr, "error receiving udev message: %s\n", strerror(errno));
200 printf("UDEV [%s] %s\n", timestr, buf);
206 /* print environment */
210 /* start of payload */
211 bufpos = strlen(buf) + 1;
213 while (bufpos < (size_t)buflen) {
218 keylen = strlen(key);
222 bufpos += keylen + 1;
229 if (uevent_netlink_sock > 0)
230 close(uevent_netlink_sock);
231 if (udev_monitor_sock > 0)
232 close(udev_monitor_sock);