#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++;
+ util_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 (strcmp(user, "root") == 0)
+ 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 (strcmp(group, "root") == 0)
+ 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;
+
+ util_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)
+ util_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 = util_strpcpyl(&s, maxsize, udev_device_get_syspath(dev), NULL);
+ if (attr != NULL)
+ util_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];
return -1;
link_target[len] = '\0';
- for (back = 0; strncmp(&link_target[back * 3], "../", 3) == 0; back++)
+ for (back = 0; startswith(&link_target[back * 3], "../"); back++)
;
for (i = 0; i <= back; i++) {
base = strrchr(syspath, '/');
prio = strtol(priority, &endptr, 10);
if (endptr[0] == '\0' || isspace(endptr[0]))
return prio;
- if (strncmp(priority, "err", 3) == 0)
+ if (startswith(priority, "err"))
return LOG_ERR;
- if (strncmp(priority, "info", 4) == 0)
+ if (startswith(priority, "info"))
return LOG_INFO;
- if (strncmp(priority, "debug", 5) == 0)
+ if (startswith(priority, "debug"))
return LOG_DEBUG;
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;
return 0;
return ts_usec(&ts);
}
+
+ssize_t print_kmsg(const char *fmt, ...)
+{
+ int fd;
+ va_list ap;
+ char text[1024];
+ ssize_t len;
+ ssize_t ret;
+
+ fd = open("/dev/kmsg", O_WRONLY|O_NOCTTY|O_CLOEXEC);
+ if (fd < 0)
+ return -errno;
+
+ 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