summaryrefslogtreecommitdiff
path: root/udev/udevmonitor.c
diff options
context:
space:
mode:
Diffstat (limited to 'udev/udevmonitor.c')
-rw-r--r--udev/udevmonitor.c289
1 files changed, 289 insertions, 0 deletions
diff --git a/udev/udevmonitor.c b/udev/udevmonitor.c
new file mode 100644
index 0000000000..2430dd39a5
--- /dev/null
+++ b/udev/udevmonitor.c
@@ -0,0 +1,289 @@
+/*
+ * Copyright (C) 2004-2006 Kay Sievers <kay.sievers@vrfy.org>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <string.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <signal.h>
+#include <getopt.h>
+#include <sys/time.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/select.h>
+#include <linux/types.h>
+#include <linux/netlink.h>
+
+#include "udev.h"
+#include "udevd.h"
+
+static int uevent_netlink_sock = -1;
+static int udev_monitor_sock = -1;
+static volatile int udev_exit;
+
+static int init_udev_monitor_socket(void)
+{
+ struct sockaddr_un saddr;
+ socklen_t addrlen;
+ int retval;
+
+ memset(&saddr, 0x00, sizeof(saddr));
+ saddr.sun_family = AF_LOCAL;
+ /* use abstract namespace for socket path */
+ strcpy(&saddr.sun_path[1], "/org/kernel/udev/monitor");
+ addrlen = offsetof(struct sockaddr_un, sun_path) + 1 + strlen(&saddr.sun_path[1]);
+
+ udev_monitor_sock = socket(AF_LOCAL, SOCK_DGRAM, 0);
+ if (udev_monitor_sock == -1) {
+ fprintf(stderr, "error getting socket: %s\n", strerror(errno));
+ return -1;
+ }
+
+ /* the bind takes care of ensuring only one copy running */
+ retval = bind(udev_monitor_sock, (struct sockaddr *) &saddr, addrlen);
+ if (retval < 0) {
+ fprintf(stderr, "bind failed: %s\n", strerror(errno));
+ close(udev_monitor_sock);
+ udev_monitor_sock = -1;
+ return -1;
+ }
+
+ return 0;
+}
+
+static int init_uevent_netlink_sock(void)
+{
+ struct sockaddr_nl snl;
+ int retval;
+
+ memset(&snl, 0x00, sizeof(struct sockaddr_nl));
+ snl.nl_family = AF_NETLINK;
+ snl.nl_pid = getpid();
+ snl.nl_groups = 1;
+
+ uevent_netlink_sock = socket(PF_NETLINK, SOCK_DGRAM, NETLINK_KOBJECT_UEVENT);
+ if (uevent_netlink_sock == -1) {
+ fprintf(stderr, "error getting socket: %s\n", strerror(errno));
+ return -1;
+ }
+
+ retval = bind(uevent_netlink_sock, (struct sockaddr *) &snl,
+ sizeof(struct sockaddr_nl));
+ if (retval < 0) {
+ fprintf(stderr, "bind failed: %s\n", strerror(errno));
+ close(uevent_netlink_sock);
+ uevent_netlink_sock = -1;
+ return -1;
+ }
+
+ return 0;
+}
+
+static void asmlinkage sig_handler(int signum)
+{
+ if (signum == SIGINT || signum == SIGTERM)
+ udev_exit = 1;
+}
+
+static const char *search_key(const char *searchkey, const char *buf, size_t buflen)
+{
+ size_t bufpos = 0;
+ size_t searchkeylen = strlen(searchkey);
+
+ while (bufpos < buflen) {
+ const char *key;
+ int keylen;
+
+ key = &buf[bufpos];
+ keylen = strlen(key);
+ if (keylen == 0)
+ break;
+ if ((strncmp(searchkey, key, searchkeylen) == 0) && key[searchkeylen] == '=')
+ return &key[searchkeylen + 1];
+ bufpos += keylen + 1;
+ }
+ return NULL;
+}
+
+int udevmonitor(int argc, char *argv[], char *envp[])
+{
+ struct sigaction act;
+ int option;
+ int env = 0;
+ int kernel = 0;
+ int udev = 0;
+ fd_set readfds;
+ int retval = 0;
+
+ static const struct option options[] = {
+ { "environment", 0, NULL, 'e' },
+ { "kernel", 0, NULL, 'k' },
+ { "udev", 0, NULL, 'u' },
+ { "help", 0, NULL, 'h' },
+ {}
+ };
+
+ while (1) {
+ option = getopt_long(argc, argv, "ekuh", options, NULL);
+ if (option == -1)
+ break;
+
+ switch (option) {
+ case 'e':
+ env = 1;
+ break;
+ case 'k':
+ kernel = 1;
+ break;
+ case 'u':
+ udev = 1;
+ break;
+ case 'h':
+ printf("Usage: udevadm monitor [--environment] [--kernel] [--udev] [--help]\n"
+ " --env print the whole event environment\n"
+ " --kernel print kernel uevents\n"
+ " --udev print udev events\n"
+ " --help print this help text\n\n");
+ default:
+ goto out;
+ }
+ }
+
+ if (!kernel && !udev) {
+ kernel = 1;
+ udev =1;
+ }
+
+ if (getuid() != 0 && kernel) {
+ fprintf(stderr, "root privileges needed to subscribe to kernel events\n");
+ goto out;
+ }
+
+ /* set signal handlers */
+ memset(&act, 0x00, sizeof(struct sigaction));
+ act.sa_handler = (void (*)(int)) sig_handler;
+ sigemptyset(&act.sa_mask);
+ act.sa_flags = SA_RESTART;
+ sigaction(SIGINT, &act, NULL);
+ sigaction(SIGTERM, &act, NULL);
+
+ printf("udevmonitor will print the received events for:\n");
+ if (udev) {
+ retval = init_udev_monitor_socket();
+ if (retval)
+ goto out;
+ printf("UDEV the event which udev sends out after rule processing\n");
+ }
+ if (kernel) {
+ retval = init_uevent_netlink_sock();
+ if (retval)
+ goto out;
+ printf("UEVENT the kernel uevent\n");
+ }
+ printf("\n");
+
+ while (!udev_exit) {
+ char buf[UEVENT_BUFFER_SIZE*2];
+ ssize_t buflen;
+ ssize_t bufpos;
+ ssize_t keys;
+ int fdcount;
+ struct timeval tv;
+ struct timezone tz;
+ char timestr[64];
+ const char *source = NULL;
+ const char *devpath, *action, *subsys;
+
+ buflen = 0;
+ FD_ZERO(&readfds);
+ if (uevent_netlink_sock >= 0)
+ FD_SET(uevent_netlink_sock, &readfds);
+ if (udev_monitor_sock >= 0)
+ FD_SET(udev_monitor_sock, &readfds);
+
+ fdcount = select(UDEV_MAX(uevent_netlink_sock, udev_monitor_sock)+1, &readfds, NULL, NULL, NULL);
+ if (fdcount < 0) {
+ if (errno != EINTR)
+ fprintf(stderr, "error receiving uevent message: %s\n", strerror(errno));
+ continue;
+ }
+
+ if (gettimeofday(&tv, &tz) == 0) {
+ snprintf(timestr, sizeof(timestr), "%llu.%06u",
+ (unsigned long long) tv.tv_sec, (unsigned int) tv.tv_usec);
+ } else
+ timestr[0] = '\0';
+
+ if ((uevent_netlink_sock >= 0) && FD_ISSET(uevent_netlink_sock, &readfds)) {
+ buflen = recv(uevent_netlink_sock, &buf, sizeof(buf), 0);
+ if (buflen <= 0) {
+ fprintf(stderr, "error receiving uevent message: %s\n", strerror(errno));
+ continue;
+ }
+ source = "UEVENT";
+ }
+
+ if ((udev_monitor_sock >= 0) && FD_ISSET(udev_monitor_sock, &readfds)) {
+ buflen = recv(udev_monitor_sock, &buf, sizeof(buf), 0);
+ if (buflen <= 0) {
+ fprintf(stderr, "error receiving udev message: %s\n", strerror(errno));
+ continue;
+ }
+ source = "UDEV ";
+ }
+
+ if (buflen == 0)
+ continue;
+
+ keys = strlen(buf) + 1; /* start of payload */
+ devpath = search_key("DEVPATH", &buf[keys], buflen);
+ action = search_key("ACTION", &buf[keys], buflen);
+ subsys = search_key("SUBSYSTEM", &buf[keys], buflen);
+ printf("%s[%s] %-8s %s (%s)\n", source, timestr, action, devpath, subsys);
+
+ /* print environment */
+ bufpos = keys;
+ if (env) {
+ while (bufpos < buflen) {
+ int keylen;
+ char *key;
+
+ key = &buf[bufpos];
+ keylen = strlen(key);
+ if (keylen == 0)
+ break;
+ printf("%s\n", key);
+ bufpos += keylen + 1;
+ }
+ printf("\n");
+ }
+ }
+
+out:
+ if (uevent_netlink_sock >= 0)
+ close(uevent_netlink_sock);
+ if (udev_monitor_sock >= 0)
+ close(udev_monitor_sock);
+
+ if (retval)
+ return 1;
+ return 0;
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-29 10:56:42 +0000