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add debug output to sysfs operations

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Signed-off-by: Kay Sievers <kay.sievers@suse.de>
This commit is contained in:
Kay Sievers 2006-01-30 08:39:55 +01:00
parent 9538b16d8b
commit 7e75cfa6fe
1 changed files with 14 additions and 4 deletions
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18
udev_sysfs.c
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@ -175,7 +175,7 @@ struct sysfs_device *sysfs_device_get(const char *devpath)
} }
/* it is a new device */ /* it is a new device */
dbg("'%s'", devpath_real); dbg("new uncached device '%s'", devpath_real);
dev = malloc(sizeof(struct sysfs_device)); dev = malloc(sizeof(struct sysfs_device));
if (dev == NULL) if (dev == NULL)
return NULL; return NULL;
@ -253,6 +253,9 @@ struct sysfs_device *sysfs_device_get_parent(struct sysfs_device *dev)
int len; int len;
int back; int back;
dbg("open '%s'", dev->devpath);
/* look if we already know the parent */
if (dev->parent != NULL) if (dev->parent != NULL)
return dev->parent; return dev->parent;
@ -271,7 +274,7 @@ struct sysfs_device *sysfs_device_get_parent(struct sysfs_device *dev)
return NULL; return NULL;
pos[0] = '\0'; pos[0] = '\0';
/* are we at the top level */ /* are we at the top level of /devices */
if (strcmp(parent_devpath, "/devices") == 0) { if (strcmp(parent_devpath, "/devices") == 0) {
dbg("/devices top level"); dbg("/devices top level");
return NULL; return NULL;
@ -289,6 +292,7 @@ struct sysfs_device *sysfs_device_get_parent(struct sysfs_device *dev)
goto device_link; goto device_link;
} }
} }
/* get parent and remember it */
dev->parent = sysfs_device_get(parent_devpath); dev->parent = sysfs_device_get(parent_devpath);
return dev->parent; return dev->parent;
@ -316,6 +320,7 @@ device_link:
strlcat(parent_devpath, "/", sizeof(parent_devpath)); strlcat(parent_devpath, "/", sizeof(parent_devpath));
strlcat(parent_devpath, &device_link_target[back * 3], 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); dev->parent = sysfs_device_get(parent_devpath);
return dev->parent; return dev->parent;
} }
@ -344,6 +349,7 @@ char *sysfs_attr_get_value(const char *devpath, const char *attr_name)
ssize_t size; ssize_t size;
size_t sysfs_len; size_t sysfs_len;
dbg("open '%s'/'%s'", devpath, attr_name);
sysfs_len = strlcpy(path_full, sysfs_path, sizeof(path_full)); sysfs_len = strlcpy(path_full, sysfs_path, sizeof(path_full));
path = &path_full[sysfs_len]; path = &path_full[sysfs_len];
strlcat(path_full, devpath, sizeof(path_full)); 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) */ /* store attribute in cache (also negatives are kept in cache) */
dbg("new uncached attribute '%s'", path_full);
attr = malloc(sizeof(struct sysfs_attr)); attr = malloc(sizeof(struct sysfs_attr));
if (attr == NULL) if (attr == NULL)
return NULL; return NULL;
memset(attr, 0x00, sizeof(struct sysfs_attr)); memset(attr, 0x00, sizeof(struct sysfs_attr));
strlcpy(attr->path, path, sizeof(attr->path)); 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); list_add(&attr->node, &attr_list);
/* read attribute value */ /* read attribute value */
fd = open(path_full, O_RDONLY); fd = open(path_full, O_RDONLY);
if (fd < 0) if (fd < 0) {
dbg("attribute '%s' does not exist", path_full);
goto out; goto out;
}
size = read(fd, value, sizeof(value)); size = read(fd, value, sizeof(value));
close(fd); close(fd);
if (size < 0) 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 */ /* got a valid value, store and return it */
value[size] = '\0'; value[size] = '\0';
remove_trailing_chars(value, '\n'); remove_trailing_chars(value, '\n');
dbg("cache '%s' with value '%s'", path_full, value);
strlcpy(attr->value_local, value, sizeof(attr->value_local)); strlcpy(attr->value_local, value, sizeof(attr->value_local));
attr->value = attr->value_local; attr->value = attr->value_local;