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authorKay Sievers <kay.sievers@vrfy.org>2008-10-22 18:03:38 +0200
committerKay Sievers <kay.sievers@vrfy.org>2008-10-22 18:03:38 +0200
commit14f4025607e905cb230c6e5b32488e9f2d07a0d2 (patch)
treefd2d4367b34872d9a123828fd2cdbba2ffdf03ac /udev/udev-util.c
parentfcd070d010de9ed803abec8899cefc399cfc5fe7 (diff)
add util_resolve_subsys_kernel()
Diffstat (limited to 'udev/udev-util.c')
-rw-r--r--udev/udev-util.c63
1 files changed, 63 insertions, 0 deletions
diff --git a/udev/udev-util.c b/udev/udev-util.c
index 76445bbcdc..3c2e2a5089 100644
--- a/udev/udev-util.c
+++ b/udev/udev-util.c
@@ -162,6 +162,69 @@ extern gid_t util_lookup_group(struct udev *udev, const char *group)
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 == NULL)
+ string = result;
+ if (string[0] != '[')
+ return -1;
+
+ util_strlcpy(temp, string, sizeof(temp));
+
+ 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_strlcpy(result, val, maxsize);
+ else
+ result[0] = '\0';
+ info(udev, "value '[%s/%s]%s' is '%s'\n", subsys, sysname, attr, result);
+ } else {
+ util_strlcpy(result, udev_device_get_syspath(dev), maxsize);
+ if (attr != NULL) {
+ util_strlcat(result, "/", maxsize);
+ util_strlcat(result, attr, maxsize);
+ }
+ info(udev, "path '[%s/%s]%s' is '%s'\n", subsys, sysname, attr, result);
+ }
+ udev_device_unref(dev);
+ return 0;
+}
+
int util_run_program(struct udev *udev, const char *command, char **envp,
char *result, size_t ressize, size_t *reslen)
{