-/*
- * libudev - interface to udev device information
- *
- * Copyright (C) 2008-2011 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>
#include <ctype.h>
#include <fcntl.h>
#include <time.h>
+#include <pwd.h>
+#include <grp.h>
#include <sys/stat.h>
+#include <sys/param.h>
#include "libudev.h"
#include "libudev-private.h"
/**
* SECTION:libudev-util
* @short_description: utils
+ *
+ * Utilities useful when dealing with devices and device node names.
*/
+int util_delete_path(struct udev *udev, const char *path)
+{
+ char p[UTIL_PATH_SIZE];
+ char *pos;
+ int err = 0;
+
+ if (path[0] == '/')
+ while(path[1] == '/')
+ path++;
+ strscpy(p, sizeof(p), path);
+ pos = strrchr(p, '/');
+ if (pos == p || pos == NULL)
+ return 0;
+
+ for (;;) {
+ *pos = '\0';
+ pos = strrchr(p, '/');
+
+ /* don't remove the last one */
+ if ((pos == p) || (pos == NULL))
+ break;
+
+ err = rmdir(p);
+ if (err < 0) {
+ if (errno == ENOENT)
+ err = 0;
+ break;
+ }
+ }
+ return err;
+}
+
+uid_t util_lookup_user(struct udev *udev, const char *user)
+{
+ char *endptr;
+ struct passwd pwbuf;
+ struct passwd *pw;
+ uid_t uid;
+ size_t buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
+ char *buf = alloca(buflen);
+
+ if (streq(user, "root"))
+ return 0;
+ uid = strtoul(user, &endptr, 10);
+ if (endptr[0] == '\0')
+ return uid;
+
+ errno = getpwnam_r(user, &pwbuf, buf, buflen, &pw);
+ if (pw != NULL)
+ return pw->pw_uid;
+ if (errno == 0 || errno == ENOENT || errno == ESRCH)
+ udev_err(udev, "specified user '%s' unknown\n", user);
+ else
+ udev_err(udev, "error resolving user '%s': %m\n", user);
+ return 0;
+}
+
+gid_t util_lookup_group(struct udev *udev, const char *group)
+{
+ char *endptr;
+ struct group grbuf;
+ struct group *gr;
+ gid_t gid = 0;
+ size_t buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
+ char *buf = NULL;
+
+ if (streq(group, "root"))
+ return 0;
+ gid = strtoul(group, &endptr, 10);
+ if (endptr[0] == '\0')
+ return gid;
+ gid = 0;
+ for (;;) {
+ char *newbuf;
+
+ newbuf = realloc(buf, buflen);
+ if (!newbuf)
+ break;
+ buf = newbuf;
+ errno = getgrnam_r(group, &grbuf, buf, buflen, &gr);
+ if (gr != NULL) {
+ gid = gr->gr_gid;
+ } else if (errno == ERANGE) {
+ buflen *= 2;
+ continue;
+ } else if (errno == 0 || errno == ENOENT || errno == ESRCH) {
+ udev_err(udev, "specified group '%s' unknown\n", group);
+ } else {
+ udev_err(udev, "error resolving group '%s': %m\n", group);
+ }
+ break;
+ }
+ free(buf);
+ return gid;
+}
+
+/* handle "[<SUBSYSTEM>/<KERNEL>]<attribute>" format */
+int util_resolve_subsys_kernel(struct udev *udev, const char *string,
+ char *result, size_t maxsize, int read_value)
+{
+ char temp[UTIL_PATH_SIZE];
+ char *subsys;
+ char *sysname;
+ struct udev_device *dev;
+ char *attr;
+
+ if (string[0] != '[')
+ return -1;
+
+ strscpy(temp, sizeof(temp), string);
+
+ subsys = &temp[1];
+
+ sysname = strchr(subsys, '/');
+ if (sysname == NULL)
+ return -1;
+ sysname[0] = '\0';
+ sysname = &sysname[1];
+
+ attr = strchr(sysname, ']');
+ if (attr == NULL)
+ return -1;
+ attr[0] = '\0';
+ attr = &attr[1];
+ if (attr[0] == '/')
+ attr = &attr[1];
+ if (attr[0] == '\0')
+ attr = NULL;
+
+ if (read_value && attr == NULL)
+ return -1;
+
+ dev = udev_device_new_from_subsystem_sysname(udev, subsys, sysname);
+ if (dev == NULL)
+ return -1;
+
+ if (read_value) {
+ const char *val;
+
+ val = udev_device_get_sysattr_value(dev, attr);
+ if (val != NULL)
+ strscpy(result, maxsize, val);
+ else
+ result[0] = '\0';
+ udev_dbg(udev, "value '[%s/%s]%s' is '%s'\n", subsys, sysname, attr, result);
+ } else {
+ size_t l;
+ char *s;
+
+ s = result;
+ l = strpcpyl(&s, maxsize, udev_device_get_syspath(dev), NULL);
+ if (attr != NULL)
+ strpcpyl(&s, l, "/", attr, NULL);
+ udev_dbg(udev, "path '[%s/%s]%s' is '%s'\n", subsys, sysname, attr, result);
+ }
+ udev_device_unref(dev);
+ return 0;
+}
ssize_t util_get_sys_core_link_value(struct udev *udev, const char *slink, const char *syspath, char *value, size_t size)
{
char path[UTIL_PATH_SIZE];
ssize_t len;
const char *pos;
- util_strscpyl(path, sizeof(path), syspath, "/", slink, NULL);
+ strscpyl(path, sizeof(path), syspath, "/", slink, NULL);
len = readlink(path, target, sizeof(target));
if (len <= 0 || len == (ssize_t)sizeof(target))
return -1;
if (pos == NULL)
return -1;
pos = &pos[1];
- return util_strscpy(value, size, pos);
+ return strscpy(value, size, pos);
}
int util_resolve_sys_link(struct udev *udev, char *syspath, size_t size)
}
if (base == NULL)
return -EINVAL;
- util_strscpyl(base, size - (base - syspath), "/", &link_target[back * 3], NULL);
+ strscpyl(base, size - (base - syspath), "/", &link_target[back * 3], NULL);
return 0;
}
return j;
}
-size_t util_path_decode(char *s)
-{
- size_t i, j;
-
- for (i = 0, j = 0; s[i] != '\0'; j++) {
- if (memcmp(&s[i], "\\x2f", 4) == 0) {
- s[j] = '/';
- i += 4;
- } else if (memcmp(&s[i], "\\x5c", 4) == 0) {
- s[j] = '\\';
- i += 4;
- } else {
- s[j] = s[i];
- i++;
- }
- }
- s[j] = '\0';
- return j;
-}
-
void util_remove_trailing_chars(char *path, char c)
{
size_t len;
path[--len] = '\0';
}
-/*
- * Concatenates strings. In any case, terminates in _all_ cases with '\0'
- * and moves the @dest pointer forward to the added '\0'. Returns the
- * remaining size, and 0 if the string was truncated.
- */
-size_t util_strpcpy(char **dest, size_t size, const char *src)
-{
- size_t len;
-
- len = strlen(src);
- if (len >= size) {
- if (size > 1)
- *dest = mempcpy(*dest, src, size-1);
- size = 0;
- *dest[0] = '\0';
- } else {
- if (len > 0) {
- *dest = mempcpy(*dest, src, len);
- size -= len;
- }
- *dest[0] = '\0';
- }
- return size;
-}
-
-/* concatenates list of strings, moves dest forward */
-size_t util_strpcpyl(char **dest, size_t size, const char *src, ...)
-{
- va_list va;
-
- va_start(va, src);
- do {
- size = util_strpcpy(dest, size, src);
- src = va_arg(va, char *);
- } while (src != NULL);
- va_end(va);
-
- return size;
-}
-
-/* copies string */
-size_t util_strscpy(char *dest, size_t size, const char *src)
-{
- char *s;
-
- s = dest;
- return util_strpcpy(&s, size, src);
-}
-
-/* concatenates list of strings */
-size_t util_strscpyl(char *dest, size_t size, const char *src, ...)
-{
- va_list va;
- char *s;
-
- va_start(va, src);
- s = dest;
- do {
- size = util_strpcpy(&s, size, src);
- src = va_arg(va, char *);
- } while (src != NULL);
- va_end(va);
-
- return size;
-}
-
/* count of characters used to encode one unicode char */
static int utf8_encoded_expected_len(const char *str)
{
* Murmurhash is under the MIT license.
*
*/
-static unsigned int murmur_hash2(const char *key, int len, unsigned int seed)
+static unsigned int murmur_hash2(const char *key, size_t len, unsigned int seed)
{
/*
* 'm' and 'r' are mixing constants generated offline.
/* mix 4 bytes at a time into the hash */
const unsigned char * data = (const unsigned char *)key;
- while(len >= 4) {
- unsigned int k = *(unsigned int *)data;
+ while(len >= sizeof(unsigned int)) {
+ unsigned int k;
+ memcpy(&k, data, sizeof(k));
k *= m;
k ^= k >> r;
k *= m;
h *= m;
h ^= k;
- data += 4;
- len -= 4;
+ data += sizeof(k);
+ len -= sizeof(k);
}
/* handle the last few bytes of the input array */
return bits;
}
-#define USEC_PER_SEC 1000000ULL
-#define NSEC_PER_USEC 1000ULL
-unsigned long long ts_usec(const struct timespec *ts)
+ssize_t print_kmsg(const char *fmt, ...)
{
- return (unsigned long long) ts->tv_sec * USEC_PER_SEC +
- (unsigned long long) ts->tv_nsec / NSEC_PER_USEC;
-}
+ int fd;
+ va_list ap;
+ char text[1024];
+ ssize_t len;
+ ssize_t ret;
-unsigned long long now_usec(void)
-{
- struct timespec ts;
+ fd = open("/dev/kmsg", O_WRONLY|O_NOCTTY|O_CLOEXEC);
+ if (fd < 0)
+ return -errno;
- if (clock_gettime(CLOCK_MONOTONIC, &ts) != 0)
- return 0;
- return ts_usec(&ts);
+ len = snprintf(text, sizeof(text), "<30>systemd-udevd[%u]: ", getpid());
+
+ va_start(ap, fmt);
+ len += vsnprintf(text + len, sizeof(text) - len, fmt, ap);
+ va_end(ap);
+
+ ret = write(fd, text, len);
+ if (ret < 0)
+ ret = -errno;
+ close(fd);
+ return ret;
}
~ianmdlvl / elogind.git / blobdiff