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authorJoe Hershberger <joe.hershberger@ni.com>2012-12-11 22:16:24 -0600
committerTom Rini <trini@ti.com>2012-12-13 11:46:55 -0700
commit170ab11075d3be56e89d6444abf1148329130f4b (patch)
treed3088ad532f4f4a0082f625ce50cfd120d6a6a1d /include
parentbe11235ab802844e12d84921a38fd8ae4ddda080 (diff)
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env: Add support for callbacks to environment vars
Add support for per-variable callbacks to the "hashtable" functions. Signed-off-by: Joe Hershberger <joe.hershberger@ni.com> !!!fix comment in callback
Diffstat (limited to 'include')
-rw-r--r--include/env_attr.h55
-rw-r--r--include/env_callback.h62
-rw-r--r--include/env_default.h5
-rw-r--r--include/environment.h2
-rw-r--r--include/search.h5
5 files changed, 129 insertions, 0 deletions
diff --git a/include/env_attr.h b/include/env_attr.h
new file mode 100644
index 0000000..6ef114f
--- /dev/null
+++ b/include/env_attr.h
@@ -0,0 +1,55 @@
+/*
+ * (C) Copyright 2012
+ * Joe Hershberger, National Instruments, joe.hershberger@ni.com
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef __ENV_ATTR_H__
+#define __ENV_ATTR_H__
+
+#define ENV_ATTR_LIST_DELIM ','
+#define ENV_ATTR_SEP ':'
+
+/*
+ * env_attr_walk takes as input an "attr_list" that takes the form:
+ * attributes = [^,:\s]*
+ * entry = name[:attributes]
+ * list = entry[,list]
+ * It will call the "callback" function with the "name" and attribute as "value"
+ * The callback may return a non-0 to abort the list walk.
+ * This return value will be passed through to the caller.
+ * 0 is returned on success.
+ */
+extern int env_attr_walk(const char *attr_list,
+ int (*callback)(const char *name, const char *value));
+
+/*
+ * env_attr_lookup takes as input an "attr_list" with the same form as above.
+ * It also takes as input a "name" to look for.
+ * If the name is found in the list, it's value is copied into "attributes".
+ * There is no protection on attributes being too small for the value.
+ * It returns -1 if attributes is NULL, 1 if "name" is not found, 2 if
+ * "attr_list" is NULL.
+ * Returns 0 on success.
+ */
+extern int env_attr_lookup(const char *attr_list, const char *name,
+ char *attributes);
+
+#endif /* __ENV_ATTR_H__ */
diff --git a/include/env_callback.h b/include/env_callback.h
new file mode 100644
index 0000000..5a460f3
--- /dev/null
+++ b/include/env_callback.h
@@ -0,0 +1,62 @@
+/*
+ * (C) Copyright 2012
+ * Joe Hershberger, National Instruments, joe.hershberger@ni.com
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+#ifndef __ENV_CALLBACK_H__
+#define __ENV_CALLBACK_H__
+
+#include <linker_lists.h>
+#include <search.h>
+
+#define ENV_CALLBACK_VAR ".callbacks"
+
+/* Board configs can define additional static callback bindings */
+#ifndef CONFIG_ENV_CALLBACK_LIST_STATIC
+#define CONFIG_ENV_CALLBACK_LIST_STATIC
+#endif
+
+/*
+ * This list of callback bindings is static, but may be overridden by defining
+ * a new association in the ".callbacks" environment variable.
+ */
+#define ENV_CALLBACK_LIST_STATIC ENV_CALLBACK_VAR ":callbacks," \
+ CONFIG_ENV_CALLBACK_LIST_STATIC
+
+struct env_clbk_tbl {
+ const char *name; /* Callback name */
+ int (*callback)(const char *name, const char *value, enum env_op op,
+ int flags);
+};
+
+struct env_clbk_tbl *find_env_callback(const char *);
+void env_callback_init(ENTRY *var_entry);
+
+/*
+ * Define a callback that can be associated with variables.
+ * when associated through the ".callbacks" environment variable, the callback
+ * will be executed any time the variable is inserted, overwritten, or deleted.
+ */
+#define U_BOOT_ENV_CALLBACK(name, callback) \
+ ll_entry_declare(struct env_clbk_tbl, name, env_clbk, env_clbk) = \
+ {#name, callback}
+
+#endif /* __ENV_CALLBACK_H__ */
diff --git a/include/env_default.h b/include/env_default.h
index a1db73a..d05eba1 100644
--- a/include/env_default.h
+++ b/include/env_default.h
@@ -24,6 +24,8 @@
* MA 02111-1307 USA
*/
+#include <env_callback.h>
+
#ifdef DEFAULT_ENV_INSTANCE_EMBEDDED
env_t environment __PPCENV__ = {
ENV_CRC, /* CRC Sum */
@@ -36,6 +38,9 @@ static char default_environment[] = {
#else
const uchar default_environment[] = {
#endif
+#ifdef CONFIG_ENV_CALLBACK_LIST_DEFAULT
+ ENV_CALLBACK_VAR "=" CONFIG_ENV_CALLBACK_LIST_DEFAULT "\0"
+#endif
#ifdef CONFIG_BOOTARGS
"bootargs=" CONFIG_BOOTARGS "\0"
#endif
diff --git a/include/environment.h b/include/environment.h
index 4b19f32..6c30215 100644
--- a/include/environment.h
+++ b/include/environment.h
@@ -164,6 +164,8 @@ extern void env_reloc(void);
#ifndef DO_DEPS_ONLY
+#include <env_attr.h>
+#include <env_callback.h>
#include <search.h>
extern struct hsearch_data env_htab;
diff --git a/include/search.h b/include/search.h
index 1e48deb..d68e24a 100644
--- a/include/search.h
+++ b/include/search.h
@@ -47,6 +47,8 @@ typedef enum {
typedef struct entry {
const char *key;
char *data;
+ int (*callback)(const char *name, const char *value, enum env_op op,
+ int flags);
} ENTRY;
/* Opaque type for internal use. */
@@ -120,6 +122,9 @@ extern int himport_r(struct hsearch_data *__htab,
const char *__env, size_t __size, const char __sep,
int __flag, int nvars, char * const vars[]);
+/* Walk the whole table calling the callback on each element */
+extern int hwalk_r(struct hsearch_data *__htab, int (*callback)(ENTRY *));
+
/* Flags for himport_r(), hexport_r(), hdelete_r(), and hsearch_r() */
#define H_NOCLEAR (1 << 0) /* do not clear hash table before importing */
#define H_FORCE (1 << 1) /* overwrite read-only/write-once variables */