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authorKay Sievers <kay.sievers@suse.de>2006-01-30 08:39:55 +0100
committerKay Sievers <kay.sievers@suse.de>2006-01-30 08:39:55 +0100
commit7e75cfa6fe0818ffb76c2a5a88c8572f04bda879 (patch)
tree592c15c4ae239318aec7d1a215f95ffd66ab0371 /udev_sysfs.c
parent9538b16d8b6086691dd01d76dea91ba73d13a630 (diff)
add debug output to sysfs operations
Signed-off-by: Kay Sievers <kay.sievers@suse.de>
Diffstat (limited to 'udev_sysfs.c')
-rw-r--r--udev_sysfs.c18
1 files changed, 14 insertions, 4 deletions
diff --git a/udev_sysfs.c b/udev_sysfs.c
index b579c17caa..ddc0b46790 100644
--- a/udev_sysfs.c
+++ b/udev_sysfs.c
@@ -175,7 +175,7 @@ struct sysfs_device *sysfs_device_get(const char *devpath)
}
/* it is a new device */
- dbg("'%s'", devpath_real);
+ dbg("new uncached device '%s'", devpath_real);
dev = malloc(sizeof(struct sysfs_device));
if (dev == NULL)
return NULL;
@@ -253,6 +253,9 @@ struct sysfs_device *sysfs_device_get_parent(struct sysfs_device *dev)
int len;
int back;
+ dbg("open '%s'", dev->devpath);
+
+ /* look if we already know the parent */
if (dev->parent != NULL)
return dev->parent;
@@ -271,7 +274,7 @@ struct sysfs_device *sysfs_device_get_parent(struct sysfs_device *dev)
return NULL;
pos[0] = '\0';
- /* are we at the top level */
+ /* are we at the top level of /devices */
if (strcmp(parent_devpath, "/devices") == 0) {
dbg("/devices top level");
return NULL;
@@ -289,6 +292,7 @@ struct sysfs_device *sysfs_device_get_parent(struct sysfs_device *dev)
goto device_link;
}
}
+ /* get parent and remember it */
dev->parent = sysfs_device_get(parent_devpath);
return dev->parent;
@@ -316,6 +320,7 @@ device_link:
strlcat(parent_devpath, "/", sizeof(parent_devpath));
strlcat(parent_devpath, &device_link_target[back * 3], sizeof(parent_devpath));
+ /* get parent and remember it */
dev->parent = sysfs_device_get(parent_devpath);
return dev->parent;
}
@@ -344,6 +349,7 @@ char *sysfs_attr_get_value(const char *devpath, const char *attr_name)
ssize_t size;
size_t sysfs_len;
+ dbg("open '%s'/'%s'", devpath, attr_name);
sysfs_len = strlcpy(path_full, sysfs_path, sizeof(path_full));
path = &path_full[sysfs_len];
strlcat(path_full, devpath, sizeof(path_full));
@@ -359,18 +365,21 @@ char *sysfs_attr_get_value(const char *devpath, const char *attr_name)
}
/* store attribute in cache (also negatives are kept in cache) */
+ dbg("new uncached attribute '%s'", path_full);
attr = malloc(sizeof(struct sysfs_attr));
if (attr == NULL)
return NULL;
memset(attr, 0x00, sizeof(struct sysfs_attr));
strlcpy(attr->path, path, sizeof(attr->path));
- dbg("add to cache '%s' '%s'", attr->path, attr->value);
+ dbg("add to cache '%s'", path_full);
list_add(&attr->node, &attr_list);
/* read attribute value */
fd = open(path_full, O_RDONLY);
- if (fd < 0)
+ if (fd < 0) {
+ dbg("attribute '%s' does not exist", path_full);
goto out;
+ }
size = read(fd, value, sizeof(value));
close(fd);
if (size < 0)
@@ -381,6 +390,7 @@ char *sysfs_attr_get_value(const char *devpath, const char *attr_name)
/* got a valid value, store and return it */
value[size] = '\0';
remove_trailing_chars(value, '\n');
+ dbg("cache '%s' with value '%s'", path_full, value);
strlcpy(attr->value_local, value, sizeof(attr->value_local));
attr->value = attr->value_local;