key_get_persistent

函数名称：Get the persistent keyring for a specific UID and link it to the nominated* keyring.

函数原型：static long key_get_persistent(struct user_namespace *ns, kuid_t uid, key_ref_t dest_ref)

返回类型：long

参数：

类型	参数	名称
struct user_namespace *	ns
kuid_t	uid
key_ref_t	dest_ref

memset( & index_key, 0, index_key的长度)

type等于key_type_keyring

description等于buf

desc_len等于输出格式化串

Finalise an index key to include a part of the description actually in the* index key, to set the domain tag and to calculate the hash.

如果 Register of per-UID persistent keyrings for this namespace 则

reg_ref等于make_key_ref( Register of per-UID persistent keyrings for this namespace , true)

lock for reading

persistent_ref等于Search the given keyring for a key that might be updated.* The caller must guarantee that the keyring is a keyring and that the* permission is granted to modify the keyring as no check is made here. The

lease a read lock

如果persistent_ref则转到:found

102

lock for writing

103

persistent_ref等于Create the persistent keyring for the specified user.* Called with the namespace's sem locked for writing.

104

lease a write lock

105

如果非是错误则转到:found

108

返回:错误

110

found :

111

ret等于key_task_permission - Check a key can be used*@key_ref: The key to check.*@cred: The credentials to use.*@perm: The permissions to check for.* Check to see whether permission is granted to use a key in the desired way,

112

如果ret恒等于0则

113

persistent等于key_ref_to_ptr(persistent_ref)

114

ret等于key_link - Link a key to a keyring*@keyring: The keyring to make the link in

115

如果ret恒等于0则

116

key_set_timeout(persistent, Expire after 3 days of non-use )

117

ret等于 key serial number

121

key_ref_put(persistent_ref)

122

返回:ret

**调用者**
名称	描述
keyctl_get_persistent	Get the persistent keyring for a specific UID and link it to the nominated* keyring.

源代码转换工具开放的插件接口	X
支持：c/c++/esqlc/java Oracle/Informix/Mysql 插件可实现：逻辑报告代码生成和批量转换代码

函数逻辑报告