merge udev/, libudev/, systemd/ files in src/; move extras/ to src/

1 files changed, 1005 insertions, 0 deletions

diff --git a/src/udev-event.c b/src/udev-event.c
new file mode 100644
index 0000000000..859d811bff
--- /dev/null
+++ b/src/udev-event.c
@@ -0,0 +1,1005 @@
+/*
+ * Copyright (C) 2003-2010 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, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <stddef.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <ctype.h>
+#include <string.h>
+#include <time.h>
+#include <net/if.h>
+#include <sys/ioctl.h>
+#include <sys/prctl.h>
+#include <sys/poll.h>
+#include <sys/epoll.h>
+#include <sys/wait.h>
+#include <sys/socket.h>
+#include <sys/signalfd.h>
+#include <linux/sockios.h>
+
+#include "udev.h"
+
+struct udev_event *udev_event_new(struct udev_device *dev)
+{
+	struct udev *udev = udev_device_get_udev(dev);
+	struct udev_event *event;
+
+	event = calloc(1, sizeof(struct udev_event));
+	if (event == NULL)
+		return NULL;
+	event->dev = dev;
+	event->udev = udev;
+	udev_list_init(udev, &event->run_list, false);
+	event->fd_signal = -1;
+	event->birth_usec = now_usec();
+	event->timeout_usec = 60 * 1000 * 1000;
+	dbg(event->udev, "allocated event %p\n", event);
+	return event;
+}
+
+void udev_event_unref(struct udev_event *event)
+{
+	if (event == NULL)
+		return;
+	udev_list_cleanup(&event->run_list);
+	free(event->program_result);
+	free(event->name);
+	dbg(event->udev, "free event %p\n", event);
+	free(event);
+}
+
+size_t udev_event_apply_format(struct udev_event *event, const char *src, char *dest, size_t size)
+{
+	struct udev_device *dev = event->dev;
+	enum subst_type {
+		SUBST_UNKNOWN,
+		SUBST_DEVNODE,
+		SUBST_ATTR,
+		SUBST_ENV,
+		SUBST_KERNEL,
+		SUBST_KERNEL_NUMBER,
+		SUBST_DRIVER,
+		SUBST_DEVPATH,
+		SUBST_ID,
+		SUBST_MAJOR,
+		SUBST_MINOR,
+		SUBST_RESULT,
+		SUBST_PARENT,
+		SUBST_NAME,
+		SUBST_LINKS,
+		SUBST_ROOT,
+		SUBST_SYS,
+	};
+	static const struct subst_map {
+		char *name;
+		char fmt;
+		enum subst_type type;
+	} map[] = {
+		{ .name = "devnode",	.fmt = 'N',	.type = SUBST_DEVNODE },
+		{ .name = "tempnode",	.fmt = 'N',	.type = SUBST_DEVNODE },
+		{ .name = "attr",	.fmt = 's',	.type = SUBST_ATTR },
+		{ .name = "sysfs",	.fmt = 's',	.type = SUBST_ATTR },
+		{ .name = "env",	.fmt = 'E',	.type = SUBST_ENV },
+		{ .name = "kernel",	.fmt = 'k',	.type = SUBST_KERNEL },
+		{ .name = "number",	.fmt = 'n',	.type = SUBST_KERNEL_NUMBER },
+		{ .name = "driver",	.fmt = 'd',	.type = SUBST_DRIVER },
+		{ .name = "devpath",	.fmt = 'p',	.type = SUBST_DEVPATH },
+		{ .name = "id",		.fmt = 'b',	.type = SUBST_ID },
+		{ .name = "major",	.fmt = 'M',	.type = SUBST_MAJOR },
+		{ .name = "minor",	.fmt = 'm',	.type = SUBST_MINOR },
+		{ .name = "result",	.fmt = 'c',	.type = SUBST_RESULT },
+		{ .name = "parent",	.fmt = 'P',	.type = SUBST_PARENT },
+		{ .name = "name",	.fmt = 'D',	.type = SUBST_NAME },
+		{ .name = "links",	.fmt = 'L',	.type = SUBST_LINKS },
+		{ .name = "root",	.fmt = 'r',	.type = SUBST_ROOT },
+		{ .name = "sys",	.fmt = 'S',	.type = SUBST_SYS },
+	};
+	const char *from;
+	char *s;
+	size_t l;
+
+	from = src;
+	s = dest;
+	l = size;
+
+	for (;;) {
+		enum subst_type type = SUBST_UNKNOWN;
+		char attrbuf[UTIL_PATH_SIZE];
+		char *attr = NULL;
+
+		while (from[0] != '\0') {
+			if (from[0] == '$') {
+				/* substitute named variable */
+				unsigned int i;
+
+				if (from[1] == '$') {
+					from++;
+					goto copy;
+				}
+
+				for (i = 0; i < ARRAY_SIZE(map); i++) {
+					if (strncmp(&from[1], map[i].name, strlen(map[i].name)) == 0) {
+						type = map[i].type;
+						from += strlen(map[i].name)+1;
+						dbg(event->udev, "will substitute format name '%s'\n", map[i].name);
+						goto subst;
+					}
+				}
+			} else if (from[0] == '%') {
+				/* substitute format char */
+				unsigned int i;
+
+				if (from[1] == '%') {
+					from++;
+					goto copy;
+				}
+
+				for (i = 0; i < ARRAY_SIZE(map); i++) {
+					if (from[1] == map[i].fmt) {
+						type = map[i].type;
+						from += 2;
+						dbg(event->udev, "will substitute format char '%c'\n", map[i].fmt);
+						goto subst;
+					}
+				}
+			}
+copy:
+			/* copy char */
+			if (l == 0)
+				goto out;
+			s[0] = from[0];
+			from++;
+			s++;
+			l--;
+		}
+
+		goto out;
+subst:
+		/* extract possible $format{attr} */
+		if (from[0] == '{') {
+			unsigned int i;
+
+			from++;
+			for (i = 0; from[i] != '}'; i++) {
+				if (from[i] == '\0') {
+					err(event->udev, "missing closing brace for format '%s'\n", src);
+					goto out;
+				}
+			}
+			if (i >= sizeof(attrbuf))
+				goto out;
+			memcpy(attrbuf, from, i);
+			attrbuf[i] = '\0';
+			from += i+1;
+			attr = attrbuf;
+		} else {
+			attr = NULL;
+		}
+
+		switch (type) {
+		case SUBST_DEVPATH:
+			l = util_strpcpy(&s, l, udev_device_get_devpath(dev));
+			dbg(event->udev, "substitute devpath '%s'\n", udev_device_get_devpath(dev));
+			break;
+		case SUBST_KERNEL:
+			l = util_strpcpy(&s, l, udev_device_get_sysname(dev));
+			dbg(event->udev, "substitute kernel name '%s'\n", udev_device_get_sysname(dev));
+			break;
+		case SUBST_KERNEL_NUMBER:
+			if (udev_device_get_sysnum(dev) == NULL)
+				break;
+			l = util_strpcpy(&s, l, udev_device_get_sysnum(dev));
+			dbg(event->udev, "substitute kernel number '%s'\n", udev_device_get_sysnum(dev));
+			break;
+		case SUBST_ID:
+			if (event->dev_parent == NULL)
+				break;
+			l = util_strpcpy(&s, l, udev_device_get_sysname(event->dev_parent));
+			dbg(event->udev, "substitute id '%s'\n", udev_device_get_sysname(event->dev_parent));
+			break;
+		case SUBST_DRIVER: {
+			const char *driver;
+
+			if (event->dev_parent == NULL)
+				break;
+
+			driver = udev_device_get_driver(event->dev_parent);
+			if (driver == NULL)
+				break;
+			l = util_strpcpy(&s, l, driver);
+			dbg(event->udev, "substitute driver '%s'\n", driver);
+			break;
+		}
+		case SUBST_MAJOR: {
+			char num[UTIL_PATH_SIZE];
+
+			sprintf(num, "%d", major(udev_device_get_devnum(dev)));
+			l = util_strpcpy(&s, l, num);
+			dbg(event->udev, "substitute major number '%s'\n", num);
+			break;
+		}
+		case SUBST_MINOR: {
+			char num[UTIL_PATH_SIZE];
+
+			sprintf(num, "%d", minor(udev_device_get_devnum(dev)));
+			l = util_strpcpy(&s, l, num);
+			dbg(event->udev, "substitute minor number '%s'\n", num);
+			break;
+		}
+		case SUBST_RESULT: {
+			char *rest;
+			int i;
+
+			if (event->program_result == NULL)
+				break;
+			/* get part part of the result string */
+			i = 0;
+			if (attr != NULL)
+				i = strtoul(attr, &rest, 10);
+			if (i > 0) {
+				char result[UTIL_PATH_SIZE];
+				char tmp[UTIL_PATH_SIZE];
+				char *cpos;
+
+				dbg(event->udev, "request part #%d of result string\n", i);
+				util_strscpy(result, sizeof(result), event->program_result);
+				cpos = result;
+				while (--i) {
+					while (cpos[0] != '\0' && !isspace(cpos[0]))
+						cpos++;
+					while (isspace(cpos[0]))
+						cpos++;
+				}
+				if (i > 0) {
+					err(event->udev, "requested part of result string not found\n");
+					break;
+				}
+				util_strscpy(tmp, sizeof(tmp), cpos);
+				/* %{2+}c copies the whole string from the second part on */
+				if (rest[0] != '+') {
+					cpos = strchr(tmp, ' ');
+					if (cpos)
+						cpos[0] = '\0';
+				}
+				l = util_strpcpy(&s, l, tmp);
+				dbg(event->udev, "substitute part of result string '%s'\n", tmp);
+			} else {
+				l = util_strpcpy(&s, l, event->program_result);
+				dbg(event->udev, "substitute result string '%s'\n", event->program_result);
+			}
+			break;
+		}
+		case SUBST_ATTR: {
+			const char *value = NULL;
+			char vbuf[UTIL_NAME_SIZE];
+			size_t len;
+			int count;
+
+			if (attr == NULL) {
+				err(event->udev, "missing file parameter for attr\n");
+				break;
+			}
+
+			/* try to read the value specified by "[dmi/id]product_name" */
+			if (util_resolve_subsys_kernel(event->udev, attr, vbuf, sizeof(vbuf), 1) == 0)
+				value = vbuf;
+
+			/* try to read the attribute the device */
+			if (value == NULL)
+				value = udev_device_get_sysattr_value(event->dev, attr);
+
+			/* try to read the attribute of the parent device, other matches have selected */
+			if (value == NULL && event->dev_parent != NULL && event->dev_parent != event->dev)
+				value = udev_device_get_sysattr_value(event->dev_parent, attr);
+
+			if (value == NULL)
+				break;
+
+			/* strip trailing whitespace, and replace unwanted characters */
+			if (value != vbuf)
+				util_strscpy(vbuf, sizeof(vbuf), value);
+			len = strlen(vbuf);
+			while (len > 0 && isspace(vbuf[--len]))
+				vbuf[len] = '\0';
+			count = util_replace_chars(vbuf, UDEV_ALLOWED_CHARS_INPUT);
+			if (count > 0)
+				info(event->udev, "%i character(s) replaced\n" , count);
+			l = util_strpcpy(&s, l, vbuf);
+			dbg(event->udev, "substitute sysfs value '%s'\n", vbuf);
+			break;
+		}
+		case SUBST_PARENT: {
+			struct udev_device *dev_parent;
+			const char *devnode;
+
+			dev_parent = udev_device_get_parent(event->dev);
+			if (dev_parent == NULL)
+				break;
+			devnode = udev_device_get_devnode(dev_parent);
+			if (devnode != NULL) {
+				size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
+
+				l = util_strpcpy(&s, l, &devnode[devlen]);
+				dbg(event->udev, "found parent '%s', got node name '%s'\n",
+				    udev_device_get_syspath(dev_parent), &devnode[devlen]);
+			}
+			break;
+		}
+		case SUBST_DEVNODE:
+			if (udev_device_get_devnode(dev) != NULL)
+				l = util_strpcpy(&s, l, udev_device_get_devnode(dev));
+			break;
+		case SUBST_NAME:
+			if (event->name != NULL) {
+				l = util_strpcpy(&s, l, event->name);
+				dbg(event->udev, "substitute name '%s'\n", event->name);
+			} else {
+				l = util_strpcpy(&s, l, udev_device_get_sysname(dev));
+				dbg(event->udev, "substitute sysname '%s'\n", udev_device_get_sysname(dev));
+			}
+			break;
+		case SUBST_LINKS: {
+			size_t devlen = strlen(udev_get_dev_path(event->udev))+1;
+			struct udev_list_entry *list_entry;
+
+			list_entry = udev_device_get_devlinks_list_entry(dev);
+			if (list_entry == NULL)
+				break;
+			l = util_strpcpy(&s, l, &udev_list_entry_get_name(list_entry)[devlen]);
+			udev_list_entry_foreach(list_entry, udev_list_entry_get_next(list_entry))
+				l = util_strpcpyl(&s, l, " ", &udev_list_entry_get_name(list_entry)[devlen], NULL);
+			break;
+		}
+		case SUBST_ROOT:
+			l = util_strpcpy(&s, l, udev_get_dev_path(event->udev));
+			dbg(event->udev, "substitute udev_root '%s'\n", udev_get_dev_path(event->udev));
+			break;
+		case SUBST_SYS:
+			l = util_strpcpy(&s, l, udev_get_sys_path(event->udev));
+			dbg(event->udev, "substitute sys_path '%s'\n", udev_get_sys_path(event->udev));
+			break;
+		case SUBST_ENV:
+			if (attr == NULL) {
+				dbg(event->udev, "missing attribute\n");
+				break;
+			} else {
+				const char *value;
+
+				value = udev_device_get_property_value(event->dev, attr);
+				if (value == NULL)
+					break;
+				dbg(event->udev, "substitute env '%s=%s'\n", attr, value);
+				l = util_strpcpy(&s, l, value);
+				break;
+			}
+		default:
+			err(event->udev, "unknown substitution type=%i\n", type);
+			break;
+		}
+	}
+
+out:
+	s[0] = '\0';
+	dbg(event->udev, "'%s' -> '%s' (%zu)\n", src, dest, l);
+	return l;
+}
+
+static int spawn_exec(struct udev_event *event,
+		      const char *cmd, char *const argv[], char **envp, const sigset_t *sigmask,
+		      int fd_stdout, int fd_stderr)
+{
+	struct udev *udev = event->udev;
+	int err;
+	int fd;
+
+	/* discard child output or connect to pipe */
+	fd = open("/dev/null", O_RDWR);
+	if (fd >= 0) {
+		dup2(fd, STDIN_FILENO);
+		if (fd_stdout < 0)
+			dup2(fd, STDOUT_FILENO);
+		if (fd_stderr < 0)
+			dup2(fd, STDERR_FILENO);
+		close(fd);
+	} else {
+		err(udev, "open /dev/null failed: %m\n");
+	}
+
+	/* connect pipes to std{out,err} */
+	if (fd_stdout >= 0) {
+		dup2(fd_stdout, STDOUT_FILENO);
+			close(fd_stdout);
+	}
+	if (fd_stderr >= 0) {
+		dup2(fd_stderr, STDERR_FILENO);
+		close(fd_stderr);
+	}
+
+	/* terminate child in case parent goes away */
+	prctl(PR_SET_PDEATHSIG, SIGTERM);
+
+	/* restore original udev sigmask before exec */
+	if (sigmask)
+		sigprocmask(SIG_SETMASK, sigmask, NULL);
+
+	execve(argv[0], argv, envp);
+
+	/* exec failed */
+	err = -errno;
+	err(udev, "failed to execute '%s' '%s': %m\n", argv[0], cmd);
+	return err;
+}
+
+static void spawn_read(struct udev_event *event,
+		      const char *cmd,
+		      int fd_stdout, int fd_stderr,
+		      char *result, size_t ressize)
+{
+	struct udev *udev = event->udev;
+	size_t respos = 0;
+	int fd_ep = -1;
+	struct epoll_event ep_outpipe, ep_errpipe;
+
+	/* read from child if requested */
+	if (fd_stdout < 0 && fd_stderr < 0)
+		return;
+
+	fd_ep = epoll_create1(EPOLL_CLOEXEC);
+	if (fd_ep < 0) {
+		err(udev, "error creating epoll fd: %m\n");
+		goto out;
+	}
+
+	if (fd_stdout >= 0) {
+		memset(&ep_outpipe, 0, sizeof(struct epoll_event));
+		ep_outpipe.events = EPOLLIN;
+		ep_outpipe.data.ptr = &fd_stdout;
+		if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stdout, &ep_outpipe) < 0) {
+			err(udev, "fail to add fd to epoll: %m\n");
+			goto out;
+		}
+	}
+
+	if (fd_stderr >= 0) {
+		memset(&ep_errpipe, 0, sizeof(struct epoll_event));
+		ep_errpipe.events = EPOLLIN;
+		ep_errpipe.data.ptr = &fd_stderr;
+		if (epoll_ctl(fd_ep, EPOLL_CTL_ADD, fd_stderr, &ep_errpipe) < 0) {
+			err(udev, "fail to add fd to epoll: %m\n");
+			goto out;
+		}
+	}
+
+	/* read child output */
+	while (fd_stdout >= 0 || fd_stderr >= 0) {
+		int timeout;
+		int fdcount;
+		struct epoll_event ev[4];
+		int i;
+
+		if (event->timeout_usec > 0) {
+			unsigned long long age_usec;
+
+			age_usec = now_usec() - event->birth_usec;
+			if (age_usec >= event->timeout_usec) {
+				err(udev, "timeout '%s'\n", cmd);
+				goto out;
+			}
+			timeout = ((event->timeout_usec - age_usec) / 1000) + 1000;
+		} else {
+			timeout = -1;
+		}
+
+		fdcount = epoll_wait(fd_ep, ev, ARRAY_SIZE(ev), timeout);
+		if (fdcount < 0) {
+			if (errno == EINTR)
+				continue;
+			err(udev, "failed to poll: %m\n");
+			goto out;
+		}
+		if (fdcount == 0) {
+			err(udev, "timeout '%s'\n", cmd);
+			goto out;
+		}
+
+		for (i = 0; i < fdcount; i++) {
+			int *fd = (int *)ev[i].data.ptr;
+
+			if (ev[i].events & EPOLLIN) {
+				ssize_t count;
+				char buf[4096];
+
+				count = read(*fd, buf, sizeof(buf)-1);
+				if (count <= 0)
+					continue;
+				buf[count] = '\0';
+
+				/* store stdout result */
+				if (result != NULL && *fd == fd_stdout) {
+					if (respos + count < ressize) {
+						memcpy(&result[respos], buf, count);
+						respos += count;
+					} else {
+						err(udev, "'%s' ressize %zd too short\n", cmd, ressize);
+					}
+				}
+
+				/* log debug output only if we watch stderr */
+				if (fd_stderr >= 0) {
+					char *pos;
+					char *line;
+
+					pos = buf;
+					while ((line = strsep(&pos, "\n"))) {
+						if (pos != NULL || line[0] != '\0')
+							info(udev, "'%s'(%s) '%s'\n", cmd, *fd == fd_stdout ? "out" : "err" , line);
+					}
+				}
+			} else if (ev[i].events & EPOLLHUP) {
+				if (epoll_ctl(fd_ep, EPOLL_CTL_DEL, *fd, NULL) < 0) {
+					err(udev, "failed to remove fd from epoll: %m\n");
+					goto out;
+				}
+				*fd = -1;
+			}
+		}
+	}
+
+	/* return the child's stdout string */
+	if (result != NULL) {
+		result[respos] = '\0';
+		dbg(udev, "result='%s'\n", result);
+	}
+out:
+	if (fd_ep >= 0)
+		close(fd_ep);
+}
+
+static int spawn_wait(struct udev_event *event, const char *cmd, pid_t pid)
+{
+	struct udev *udev = event->udev;
+	struct pollfd pfd[1];
+	int err = 0;
+
+	pfd[0].events = POLLIN;
+	pfd[0].fd = event->fd_signal;
+
+	while (pid > 0) {
+		int timeout;
+		int fdcount;
+
+		if (event->timeout_usec > 0) {
+			unsigned long long age_usec;
+
+			age_usec = now_usec() - event->birth_usec;
+			if (age_usec >= event->timeout_usec)
+				timeout = 1000;
+			else
+				timeout = ((event->timeout_usec - age_usec) / 1000) + 1000;
+		} else {
+			timeout = -1;
+		}
+
+		fdcount = poll(pfd, 1, timeout);
+		if (fdcount < 0) {
+			if (errno == EINTR)
+				continue;
+			err = -errno;
+			err(udev, "failed to poll: %m\n");
+			goto out;
+		}
+		if (fdcount == 0) {
+			err(udev, "timeout: killing '%s' [%u]\n", cmd, pid);
+			kill(pid, SIGKILL);
+		}
+
+		if (pfd[0].revents & POLLIN) {
+			struct signalfd_siginfo fdsi;
+			int status;
+			ssize_t size;
+
+			size = read(event->fd_signal, &fdsi, sizeof(struct signalfd_siginfo));
+			if (size != sizeof(struct signalfd_siginfo))
+				continue;
+
+			switch (fdsi.ssi_signo) {
+			case SIGTERM:
+				event->sigterm = true;
+				break;
+			case SIGCHLD:
+				if (waitpid(pid, &status, WNOHANG) < 0)
+					break;
+				if (WIFEXITED(status)) {
+					info(udev, "'%s' [%u] exit with return code %i\n", cmd, pid, WEXITSTATUS(status));
+					if (WEXITSTATUS(status) != 0)
+						err = -1;
+				} else if (WIFSIGNALED(status)) {
+					err(udev, "'%s' [%u] terminated by signal %i (%s)\n", cmd, pid, WTERMSIG(status), strsignal(WTERMSIG(status)));
+					err = -1;
+				} else if (WIFSTOPPED(status)) {
+					err(udev, "'%s' [%u] stopped\n", cmd, pid);
+					err = -1;
+				} else if (WIFCONTINUED(status)) {
+					err(udev, "'%s' [%u] continued\n", cmd, pid);
+					err = -1;
+				} else {
+					err(udev, "'%s' [%u] exit with status 0x%04x\n", cmd, pid, status);
+					err = -1;
+				}
+				pid = 0;
+				break;
+			}
+		}
+	}
+out:
+	return err;
+}
+
+int udev_build_argv(struct udev *udev, char *cmd, int *argc, char *argv[])
+{
+	int i = 0;
+	char *pos;
+
+	if (strchr(cmd, ' ') == NULL) {
+		argv[i++] = cmd;
+		goto out;
+	}
+
+	pos = cmd;
+	while (pos != NULL && pos[0] != '\0') {
+		if (pos[0] == '\'') {
+			/* do not separate quotes */
+			pos++;
+			argv[i] = strsep(&pos, "\'");
+			if (pos != NULL)
+				while (pos[0] == ' ')
+					pos++;
+		} else {
+			argv[i] = strsep(&pos, " ");
+			if (pos != NULL)
+				while (pos[0] == ' ')
+					pos++;
+		}
+		dbg(udev, "argv[%i] '%s'\n", i, argv[i]);
+		i++;
+	}
+out:
+	argv[i] = NULL;
+	if (argc)
+		*argc = i;
+	return 0;
+}
+
+int udev_event_spawn(struct udev_event *event,
+		     const char *cmd, char **envp, const sigset_t *sigmask,
+		     char *result, size_t ressize)
+{
+	struct udev *udev = event->udev;
+	int outpipe[2] = {-1, -1};
+	int errpipe[2] = {-1, -1};
+	pid_t pid;
+	char arg[UTIL_PATH_SIZE];
+	char *argv[128];
+	char program[UTIL_PATH_SIZE];
+	int err = 0;
+
+	util_strscpy(arg, sizeof(arg), cmd);
+	udev_build_argv(event->udev, arg, NULL, argv);
+
+	/* pipes from child to parent */
+	if (result != NULL || udev_get_log_priority(udev) >= LOG_INFO) {
+		if (pipe2(outpipe, O_NONBLOCK) != 0) {
+			err = -errno;
+			err(udev, "pipe failed: %m\n");
+			goto out;
+		}
+	}
+	if (udev_get_log_priority(udev) >= LOG_INFO) {
+		if (pipe2(errpipe, O_NONBLOCK) != 0) {
+			err = -errno;
+			err(udev, "pipe failed: %m\n");
+			goto out;
+		}
+	}
+
+	/* allow programs in /usr/lib/udev/ to be called without the path */
+	if (argv[0][0] != '/') {
+		util_strscpyl(program, sizeof(program), PKGLIBEXECDIR "/", argv[0], NULL);
+		argv[0] = program;
+	}
+
+	pid = fork();
+	switch(pid) {
+	case 0:
+		/* child closes parent's ends of pipes */
+		if (outpipe[READ_END] >= 0) {
+			close(outpipe[READ_END]);
+			outpipe[READ_END] = -1;
+		}
+		if (errpipe[READ_END] >= 0) {
+			close(errpipe[READ_END]);
+			errpipe[READ_END] = -1;
+		}
+
+		info(udev, "starting '%s'\n", cmd);
+
+		err = spawn_exec(event, cmd, argv, envp, sigmask,
+				 outpipe[WRITE_END], errpipe[WRITE_END]);
+
+		_exit(2 );
+	case -1:
+		err(udev, "fork of '%s' failed: %m\n", cmd);
+		err = -1;
+		goto out;
+	default:
+		/* parent closed child's ends of pipes */
+		if (outpipe[WRITE_END] >= 0) {
+			close(outpipe[WRITE_END]);
+			outpipe[WRITE_END] = -1;
+		}
+		if (errpipe[WRITE_END] >= 0) {
+			close(errpipe[WRITE_END]);
+			errpipe[WRITE_END] = -1;
+		}
+
+		spawn_read(event, cmd,
+			 outpipe[READ_END], errpipe[READ_END],
+			 result, ressize);
+
+		err = spawn_wait(event, cmd, pid);
+	}
+
+out:
+	if (outpipe[READ_END] >= 0)
+		close(outpipe[READ_END]);
+	if (outpipe[WRITE_END] >= 0)
+		close(outpipe[WRITE_END]);
+	if (errpipe[READ_END] >= 0)
+		close(errpipe[READ_END]);
+	if (errpipe[WRITE_END] >= 0)
+		close(errpipe[WRITE_END]);
+	return err;
+}
+
+static void rename_netif_kernel_log(struct ifreq ifr)
+{
+	int klog;
+	FILE *f;
+
+	klog = open("/dev/kmsg", O_WRONLY);
+	if (klog < 0)
+		return;
+
+	f = fdopen(klog, "w");
+	if (f == NULL) {
+		close(klog);
+		return;
+	}
+
+	fprintf(f, "<30>udevd[%u]: renamed network interface %s to %s\n",
+		getpid(), ifr.ifr_name, ifr.ifr_newname);
+	fclose(f);
+}
+
+static int rename_netif(struct udev_event *event)
+{
+	struct udev_device *dev = event->dev;
+	int sk;
+	struct ifreq ifr;
+	int loop;
+	int err;
+
+	info(event->udev, "changing net interface name from '%s' to '%s'\n",
+	     udev_device_get_sysname(dev), event->name);
+
+	sk = socket(PF_INET, SOCK_DGRAM, 0);
+	if (sk < 0) {
+		err = -errno;
+		err(event->udev, "error opening socket: %m\n");
+		return err;
+	}
+
+	memset(&ifr, 0x00, sizeof(struct ifreq));
+	util_strscpy(ifr.ifr_name, IFNAMSIZ, udev_device_get_sysname(dev));
+	util_strscpy(ifr.ifr_newname, IFNAMSIZ, event->name);
+	err = ioctl(sk, SIOCSIFNAME, &ifr);
+	if (err == 0) {
+		rename_netif_kernel_log(ifr);
+		goto out;
+	}
+
+	/* keep trying if the destination interface name already exists */
+	err = -errno;
+	if (err != -EEXIST)
+		goto out;
+
+	/* free our own name, another process may wait for us */
+	snprintf(ifr.ifr_newname, IFNAMSIZ, "rename%u", udev_device_get_ifindex(dev));
+	err = ioctl(sk, SIOCSIFNAME, &ifr);
+	if (err < 0) {
+		err = -errno;
+		goto out;
+	}
+
+	/* log temporary name */
+	rename_netif_kernel_log(ifr);
+
+	/* wait a maximum of 90 seconds for our target to become available */
+	util_strscpy(ifr.ifr_name, IFNAMSIZ, ifr.ifr_newname);
+	util_strscpy(ifr.ifr_newname, IFNAMSIZ, event->name);
+	loop = 90 * 20;
+	while (loop--) {
+		const struct timespec duration = { 0, 1000 * 1000 * 1000 / 20 };
+
+		dbg(event->udev, "wait for netif '%s' to become free, loop=%i\n",
+		    event->name, (90 * 20) - loop);
+		nanosleep(&duration, NULL);
+
+		err = ioctl(sk, SIOCSIFNAME, &ifr);
+		if (err == 0) {
+			rename_netif_kernel_log(ifr);
+			break;
+		}
+		err = -errno;
+		if (err != -EEXIST)
+			break;
+	}
+
+out:
+	if (err < 0)
+		err(event->udev, "error changing net interface name %s to %s: %m\n", ifr.ifr_name, ifr.ifr_newname);
+	close(sk);
+	return err;
+}
+
+int udev_event_execute_rules(struct udev_event *event, struct udev_rules *rules, const sigset_t *sigmask)
+{
+	struct udev_device *dev = event->dev;
+	int err = 0;
+
+	if (udev_device_get_subsystem(dev) == NULL)
+		return -1;
+
+	if (strcmp(udev_device_get_action(dev), "remove") == 0) {
+		udev_device_read_db(dev, NULL);
+		udev_device_delete_db(dev);
+		udev_device_tag_index(dev, NULL, false);
+
+		if (major(udev_device_get_devnum(dev)) != 0)
+			udev_watch_end(event->udev, dev);
+
+		udev_rules_apply_to_event(rules, event, sigmask);
+
+		if (major(udev_device_get_devnum(dev)) != 0)
+			err = udev_node_remove(dev);
+	} else {
+		event->dev_db = udev_device_new_from_syspath(event->udev, udev_device_get_syspath(dev));
+		if (event->dev_db != NULL) {
+			udev_device_read_db(event->dev_db, NULL);
+			udev_device_set_info_loaded(event->dev_db);
+
+			/* disable watch during event processing */
+			if (major(udev_device_get_devnum(dev)) != 0)
+				udev_watch_end(event->udev, event->dev_db);
+		}
+
+		udev_rules_apply_to_event(rules, event, sigmask);
+
+		/* rename a new network interface, if needed */
+		if (udev_device_get_ifindex(dev) > 0 && strcmp(udev_device_get_action(dev), "add") == 0 &&
+		    event->name != NULL && strcmp(event->name, udev_device_get_sysname(dev)) != 0) {
+			char syspath[UTIL_PATH_SIZE];
+			char *pos;
+
+			err = rename_netif(event);
+			if (err == 0) {
+				info(event->udev, "renamed netif to '%s'\n", event->name);
+
+				/* remember old name */
+				udev_device_add_property(dev, "INTERFACE_OLD", udev_device_get_sysname(dev));
+
+				/* now change the devpath, because the kernel device name has changed */
+				util_strscpy(syspath, sizeof(syspath), udev_device_get_syspath(dev));
+				pos = strrchr(syspath, '/');
+				if (pos != NULL) {
+					pos++;
+					util_strscpy(pos, sizeof(syspath) - (pos - syspath), event->name);
+					udev_device_set_syspath(event->dev, syspath);
+					udev_device_add_property(dev, "INTERFACE", udev_device_get_sysname(dev));
+					info(event->udev, "changed devpath to '%s'\n", udev_device_get_devpath(dev));
+				}
+			}
+		}
+
+		if (major(udev_device_get_devnum(dev)) != 0) {
+			/* remove/update possible left-over symlinks from old database entry */
+			if (event->dev_db != NULL)
+				udev_node_update_old_links(dev, event->dev_db);
+
+			if (!event->mode_set) {
+				if (udev_device_get_devnode_mode(dev) > 0) {
+					/* kernel supplied value */
+					event->mode = udev_device_get_devnode_mode(dev);
+				} else if (event->gid > 0) {
+					/* default 0660 if a group is assigned */
+					event->mode = 0660;
+				} else {
+					/* default 0600 */
+					event->mode = 0600;
+				}
+			}
+
+			err = udev_node_add(dev, event->mode, event->uid, event->gid);
+		}
+
+		/* preserve old, or get new initialization timestamp */
+		if (event->dev_db != NULL && udev_device_get_usec_initialized(event->dev_db) > 0)
+			udev_device_set_usec_initialized(event->dev, udev_device_get_usec_initialized(event->dev_db));
+		else if (udev_device_get_usec_initialized(event->dev) == 0)
+			udev_device_set_usec_initialized(event->dev, now_usec());
+
+		/* (re)write database file */
+		udev_device_update_db(dev);
+		udev_device_tag_index(dev, event->dev_db, true);
+		udev_device_set_is_initialized(dev);
+
+		udev_device_unref(event->dev_db);
+		event->dev_db = NULL;
+	}
+out:
+	return err;
+}
+
+int udev_event_execute_run(struct udev_event *event, const sigset_t *sigmask)
+{
+	struct udev_list_entry *list_entry;
+	int err = 0;
+
+	dbg(event->udev, "executing run list\n");
+	udev_list_entry_foreach(list_entry, udev_list_get_entry(&event->run_list)) {
+		const char *cmd = udev_list_entry_get_name(list_entry);
+
+		if (strncmp(cmd, "socket:", strlen("socket:")) == 0) {
+			struct udev_monitor *monitor;
+
+			monitor = udev_monitor_new_from_socket(event->udev, &cmd[strlen("socket:")]);
+			if (monitor == NULL)
+				continue;
+			udev_monitor_send_device(monitor, NULL, event->dev);
+			udev_monitor_unref(monitor);
+		} else {
+			char program[UTIL_PATH_SIZE];
+			char **envp;
+
+			if (event->exec_delay > 0) {
+				info(event->udev, "delay execution of '%s'\n", program);
+				sleep(event->exec_delay);
+			}
+
+			udev_event_apply_format(event, cmd, program, sizeof(program));
+			envp = udev_device_get_properties_envp(event->dev);
+			if (udev_event_spawn(event, program, envp, sigmask, NULL, 0) < 0) {
+				if (udev_list_entry_get_num(list_entry))
+					err = -1;
+			}
+		}
+	}
+	return err;
+}