Changeset 76f382b in mainline for uspace/lib/c/generic/sysinfo.c

Timestamp:

2012-03-02T14:50:42Z (12 years ago)

Author:

Martin Decky <martin@…>

Branches:

lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export

Children:

8b9a443

Parents:

560d79f

Message:

support for listing sysinfo from uspace

File:

• uspace/lib/c/generic/sysinfo.c (modified) (1 diff)

uspace/lib/c/generic/sysinfo.c

@@ -40 +40 @@
 #include <bool.h>
 
+/** Get sysinfo keys size
+ *
+ * @param path  Sysinfo path.
+ * @param value Pointer to store the keys size.
+ *
+ * @return EOK if the keys were successfully read.
+ *
+ */
+static int sysinfo_get_keys_size(const char *path, size_t *size)
+{
+        return (int) __SYSCALL3(SYS_SYSINFO_GET_KEYS_SIZE, (sysarg_t) path,
+            (sysarg_t) str_size(path), (sysarg_t) size);
+}
+
+/** Get sysinfo keys
+ *
+ * @param path  Sysinfo path.
+ * @param value Pointer to store the keys size.
+ *
+ * @return Keys read from sysinfo or NULL if the
+ *         sysinfo item has no subkeys.
+ *         The returned non-NULL pointer should be
+ *         freed by free().
+ *
+ */
+char *sysinfo_get_keys(const char *path, size_t *size)
+{
+        /*
+         * The size of the keys might change during time.
+         * Unfortunatelly we cannot allocate the buffer
+         * and transfer the keys as a single atomic operation.
+         */
+        
+        /* Get the keys size */
+        int ret = sysinfo_get_keys_size(path, size);
+        if ((ret != EOK) || (size == 0)) {
+                /*
+                 * Item with no subkeys.
+                 */
+                *size = 0;
+                return NULL;
+        }
+        
+        char *data = malloc(*size);
+        if (data == NULL) {
+                *size = 0;
+                return NULL;
+        }
+        
+        /* Get the data */
+        size_t sz;
+        ret = __SYSCALL5(SYS_SYSINFO_GET_KEYS, (sysarg_t) path,
+            (sysarg_t) str_size(path), (sysarg_t) data, (sysarg_t) *size,
+            (sysarg_t) &sz);
+        if (ret == EOK) {
+                *size = sz;
+                return data;
+        }
+        
+        free(data);
+        *size = 0;
+        return NULL;
+}
+
 /** Get sysinfo item type
  *