diff options
Diffstat (limited to 'libc/include/sys/system_properties.h')
-rw-r--r-- | libc/include/sys/system_properties.h | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/libc/include/sys/system_properties.h b/libc/include/sys/system_properties.h new file mode 100644 index 0000000..2eb00cd --- /dev/null +++ b/libc/include/sys/system_properties.h @@ -0,0 +1,79 @@ +/* + * 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 + +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); + +#endif |