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- /*
- * Copyright (C) 2008 The Android Open Source Project
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * * Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- #ifndef _INCLUDE_SYS_SYSTEM_PROPERTIES_H
- #define _INCLUDE_SYS_SYSTEM_PROPERTIES_H
- #include <sys/cdefs.h>
- __BEGIN_DECLS
- typedef struct prop_info prop_info;
- #define PROP_NAME_MAX 32
- #define PROP_VALUE_MAX 92
- /* Look up a system property by name, copying its value and a
- ** \0 terminator to the provided pointer. The total bytes
- ** copied will be no greater than PROP_VALUE_MAX. Returns
- ** the string length of the value. A property that is not
- ** defined is identical to a property with a length 0 value.
- */
- int __system_property_get(const char *name, char *value);
- /* Return a pointer to the system property named name, if it
- ** exists, or NULL if there is no such property. Use
- ** __system_property_read() to obtain the string value from
- ** the returned prop_info pointer.
- **
- ** It is safe to cache the prop_info pointer to avoid future
- ** lookups. These returned pointers will remain valid for
- ** the lifetime of the system.
- */
- const prop_info *__system_property_find(const char *name);
- /* Read the value of a system property. Returns the length
- ** of the value. Copies the value and \0 terminator into
- ** the provided value pointer. Total length (including
- ** terminator) will be no greater that PROP_VALUE_MAX.
- **
- ** If name is nonzero, up to PROP_NAME_MAX bytes will be
- ** copied into the provided name pointer. The name will
- ** be \0 terminated.
- */
- int __system_property_read(const prop_info *pi, char *name, char *value);
- /* Return a prop_info for the nth system property, or NULL if
- ** there is no nth property. Use __system_property_read() to
- ** read the value of this property.
- **
- ** This method is for inspecting and debugging the property
- ** system. Please use __system_property_find() instead.
- **
- ** Order of results may change from call to call. This is
- ** not a bug.
- */
- const prop_info *__system_property_find_nth(unsigned n);
- __END_DECLS
- #endif
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