-/*
- * libudev - interface to udev device information
- *
- * Copyright (C) 2008-2010 Kay Sievers <kay.sievers@vrfy.org>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- */
+/***
+ This file is part of systemd.
+
+ Copyright 2008-2012 Kay Sievers <kay@vrfy.org>
+
+ systemd is free software; you can redistribute it and/or modify it
+ under the terms of the GNU Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, or
+ (at your option) any later version.
+
+ systemd 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
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
#include <stdio.h>
#include <stdlib.h>
return udev_monitor;
}
-/**
- * udev_monitor_new_from_socket:
- * @udev: udev library context
- * @socket_path: unix socket path
- *
- * This function is removed from libudev and will not do anything.
- *
- * Returns: #NULL
- **/
-struct udev_monitor *udev_monitor_new_from_socket(struct udev *udev, const char *socket_path);
-_public_ struct udev_monitor *udev_monitor_new_from_socket(struct udev *udev, const char *socket_path)
-{
- err(udev, "udev_monitor_new_from_socket() does not do anything; please migrate to netlink\n");
- errno = ENOSYS;
- return NULL;
-}
-
struct udev_monitor *udev_monitor_new_from_netlink_fd(struct udev *udev, const char *name, int fd)
{
struct udev_monitor *udev_monitor;
if (fd < 0) {
udev_monitor->sock = socket(PF_NETLINK, SOCK_RAW|SOCK_CLOEXEC|SOCK_NONBLOCK, NETLINK_KOBJECT_UEVENT);
if (udev_monitor->sock == -1) {
- err(udev, "error getting socket: %m\n");
+ udev_err(udev, "error getting socket: %m\n");
free(udev_monitor);
return NULL;
}
if (err == 0)
udev_monitor->snl.nl.nl_pid = snl.nl.nl_pid;
} else {
- err(udev_monitor->udev, "bind failed: %m\n");
+ udev_err(udev_monitor->udev, "bind failed: %m\n");
return err;
}
* the bound socket will be closed, and the resources of the monitor
* will be released.
*
+ * Returns: the passed udev monitor if it has still an active reference, or #NULL otherwise.
**/
-_public_ void udev_monitor_unref(struct udev_monitor *udev_monitor)
+_public_ struct udev_monitor *udev_monitor_unref(struct udev_monitor *udev_monitor)
{
if (udev_monitor == NULL)
- return;
+ return NULL;
udev_monitor->refcount--;
if (udev_monitor->refcount > 0)
- return;
+ return udev_monitor;
if (udev_monitor->sock >= 0)
close(udev_monitor->sock);
udev_list_cleanup(&udev_monitor->filter_subsystem_list);
udev_list_cleanup(&udev_monitor->filter_tag_list);
free(udev_monitor);
+ return NULL;
}
/**
*
* Only socket connections with uid=0 are accepted.
*
+ * The monitor socket is by default set to NONBLOCK. A variant of poll() on
+ * the file descriptor returned by udev_monitor_get_fd() should to be used to
+ * wake up when new devices arrive, or alternatively the file descriptor
+ * switched into blocking mode.
+ *
* The initial refcount is 1, and needs to be decremented to
* release the resources of the udev device.
*
buflen = recvmsg(udev_monitor->sock, &smsg, 0);
if (buflen < 0) {
if (errno != EINTR)
- dbg(udev_monitor->udev, "unable to receive message\n");
+ udev_dbg(udev_monitor->udev, "unable to receive message\n");
return NULL;
}
if (buflen < 32 || (size_t)buflen >= sizeof(buf)) {
- dbg(udev_monitor->udev, "invalid message length\n");
+ udev_dbg(udev_monitor->udev, "invalid message length\n");
return NULL;
}
/* unicast message, check if we trust the sender */
if (udev_monitor->snl_trusted_sender.nl.nl_pid == 0 ||
snl.nl.nl_pid != udev_monitor->snl_trusted_sender.nl.nl_pid) {
- dbg(udev_monitor->udev, "unicast netlink message ignored\n");
+ udev_dbg(udev_monitor->udev, "unicast netlink message ignored\n");
return NULL;
}
} else if (snl.nl.nl_groups == UDEV_MONITOR_KERNEL) {
if (snl.nl.nl_pid > 0) {
- dbg(udev_monitor->udev, "multicast kernel netlink message from pid %d ignored\n",
+ udev_dbg(udev_monitor->udev, "multicast kernel netlink message from pid %d ignored\n",
snl.nl.nl_pid);
return NULL;
}
cmsg = CMSG_FIRSTHDR(&smsg);
if (cmsg == NULL || cmsg->cmsg_type != SCM_CREDENTIALS) {
- dbg(udev_monitor->udev, "no sender credentials received, message ignored\n");
+ udev_dbg(udev_monitor->udev, "no sender credentials received, message ignored\n");
return NULL;
}
cred = (struct ucred *)CMSG_DATA(cmsg);
if (cred->uid != 0) {
- dbg(udev_monitor->udev, "sender uid=%d, message ignored\n", cred->uid);
+ udev_dbg(udev_monitor->udev, "sender uid=%d, message ignored\n", cred->uid);
return NULL;
}
/* udev message needs proper version magic */
nlh = (struct udev_monitor_netlink_header *) buf;
if (nlh->magic != htonl(UDEV_MONITOR_MAGIC)) {
- err(udev_monitor->udev, "unrecognized message signature (%x != %x)\n",
+ udev_err(udev_monitor->udev, "unrecognized message signature (%x != %x)\n",
nlh->magic, htonl(UDEV_MONITOR_MAGIC));
return NULL;
}
- if (nlh->properties_off+32 > buflen)
+ if (nlh->properties_off+32 > (size_t)buflen)
return NULL;
bufpos = nlh->properties_off;
} else {
/* kernel message with header */
bufpos = strlen(buf) + 1;
if ((size_t)bufpos < sizeof("a@/d") || bufpos >= buflen) {
- dbg(udev_monitor->udev, "invalid message length\n");
+ udev_dbg(udev_monitor->udev, "invalid message length\n");
return NULL;
}
/* check message header */
if (strstr(buf, "@/") == NULL) {
- dbg(udev_monitor->udev, "unrecognized message header\n");
+ udev_dbg(udev_monitor->udev, "unrecognized message header\n");
return NULL;
}
}
}
if (udev_device_add_property_from_string_parse_finish(udev_device) < 0) {
- dbg(udev_monitor->udev, "missing values, invalid device\n");
+ udev_dbg(udev_monitor->udev, "missing values, invalid device\n");
udev_device_unref(udev_device);
return NULL;
}
smsg.msg_name = &udev_monitor->snl_destination;
smsg.msg_namelen = sizeof(struct sockaddr_nl);
count = sendmsg(udev_monitor->sock, &smsg, 0);
- dbg(udev_monitor->udev, "passed %zi bytes to netlink monitor %p\n", count, udev_monitor);
+ udev_dbg(udev_monitor->udev, "passed %zi bytes to netlink monitor %p\n", count, udev_monitor);
return count;
}
~ianmdlvl / elogind.git / blobdiff