chiark / gitweb /
udevadm: monitor - use libudev code to retrieve device data
authorKay Sievers <kay.sievers@vrfy.org>
Tue, 9 Sep 2008 15:41:17 +0000 (17:41 +0200)
committerKay Sievers <kay.sievers@vrfy.org>
Tue, 9 Sep 2008 15:41:17 +0000 (17:41 +0200)
udev/udevadm-monitor.c

index f884337..29f819f 100644 (file)
 
 #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);
-
-       while (bufpos < buflen) {
-               const char *key;
-               int keylen;
+       printf("%s=%s\n", key, value);
+       return 0;
+}
 
-               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;
 }