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udevadm: monitor - use libudev code to retrieve device data

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This commit is contained in:
Kay Sievers 2008-09-09 17:41:17 +02:00
parent 1c7047ea77
commit 9b3a33a9ff
1 changed files with 38 additions and 96 deletions
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134
udev/udevadm-monitor.c
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@ -34,61 +34,24 @@
#include "udev.h"
static int uevent_netlink_sock = -1;
static int udev_exit;
static int init_uevent_netlink_sock(void)
{
struct sockaddr_nl snl;
int err;
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;
}
err = bind(uevent_netlink_sock, (struct sockaddr *) &snl,
sizeof(struct sockaddr_nl));
if (err < 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)
static int print_properties_cb(struct udev_device *udev_device, const char *key, const char *value, void *data)
{
size_t bufpos = 0;
size_t searchkeylen = strlen(searchkey);
printf("%s=%s\n", key, value);
return 0;
}
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;
static void print_properties(struct udev_device *device)
{
udev_device_get_properties(device, print_properties_cb, NULL);
printf("\n");
}
int udevadm_monitor(struct udev *udev, int argc, char *argv[])
@ -99,6 +62,7 @@ int udevadm_monitor(struct udev *udev, int argc, char *argv[])
int print_kernel = 0;
int print_udev = 0;
struct udev_monitor *udev_monitor = NULL;
struct udev_monitor *kernel_monitor = NULL;
fd_set readfds;
int rc = 0;
@ -168,34 +132,32 @@ int udevadm_monitor(struct udev *udev, int argc, char *argv[])
printf("UDEV the event which udev sends out after rule processing\n");
}
if (print_kernel) {
if (init_uevent_netlink_sock() < 0) {
kernel_monitor = udev_monitor_new_from_netlink(udev);
if (kernel_monitor == NULL) {
rc = 3;
goto out;
}
if (udev_monitor_enable_receiving(kernel_monitor) < 0) {
rc = 4;
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 (kernel_monitor != NULL)
FD_SET(udev_monitor_get_fd(kernel_monitor), &readfds);
if (udev_monitor != NULL)
FD_SET(udev_monitor_get_fd(udev_monitor), &readfds);
fdcount = select(UDEV_MAX(uevent_netlink_sock, udev_monitor_get_fd(udev_monitor))+1,
fdcount = select(UDEV_MAX(udev_monitor_get_fd(kernel_monitor), udev_monitor_get_fd(udev_monitor))+1,
&readfds, NULL, NULL, NULL);
if (fdcount < 0) {
if (errno != EINTR)
@ -209,55 +171,35 @@ int udevadm_monitor(struct udev *udev, int argc, char *argv[])
} 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));
if ((kernel_monitor != NULL) && FD_ISSET(udev_monitor_get_fd(kernel_monitor), &readfds)) {
struct udev_device *device = udev_monitor_receive_device(kernel_monitor);
if (device == NULL)
continue;
}
source = "UEVENT";
printf("UEVENT[%s] %-8s %s (%s)\n", timestr,
udev_device_get_action(device),
udev_device_get_devpath(device),
udev_device_get_subsystem(device));
if (env)
print_properties(device);
udev_device_unref(device);
}
if ((udev_monitor != NULL) && FD_ISSET(udev_monitor_get_fd(udev_monitor), &readfds)) {
buflen = recv(udev_monitor_get_fd(udev_monitor), &buf, sizeof(buf), 0);
if (buflen <= 0) {
fprintf(stderr, "error receiving udev message: %s\n", strerror(errno));
struct udev_device *device = udev_monitor_receive_device(udev_monitor);
if (device == NULL)
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");
printf("UDEV [%s] %-8s %s (%s)\n", timestr,
udev_device_get_action(device),
udev_device_get_devpath(device),
udev_device_get_subsystem(device));
if (env)
print_properties(device);
udev_device_unref(device);
}
}
out:
udev_monitor_unref(udev_monitor);
if (uevent_netlink_sock >= 0)
close(uevent_netlink_sock);
udev_monitor_unref(kernel_monitor);
return rc;
}