man acl_get_file (Fonctions bibliothèques) - acl_get_file
NAME
LIBRARY
Linux Access Control Lists library (libacl, -lacl).
SYNOPSIS
DESCRIPTION
The acl_get_file function retrieves the access ACL associated with a file or directory, or the default ACL associated with a directory. The pathname for the file or directory is pointed to by the argument path_p . The ACL is placed into working storage and acl_get_file returns a pointer to that storage.
In order to read an ACL from an object, a process must have read access to the object's attributes.
The value of the argument type is used to indicate whether the access ACL or the default ACL associated with path_p is returned. If type is ACL_TYPE_ACCESS, the access ACL of path_p is returned. If type is ACL_TYPE_DEFAULT, the default ACL of path_p is returned. If type is ACL_TYPE_DEFAULT and no default ACL is associated with the directory path_p , then an ACL containing zero ACL entries is returned. If type specifies a type of ACL that cannot be associated with path_p , then the function fails.
This function may cause memory to be allocated. The caller should free any releasable memory, when the new ACL is no longer required, by calling acl_free() with the (void*)acl_t returned by acl_get_file as an argument.
RETURN VALUE
On success, this function returns a pointer to the working storage. On error, a value of (acl_t)NULL is returned, and errno is set appropriately.
ERRORS
If any of the following conditions occur, the acl_get_file function returns a value of (acl_t)NULL and sets errno to the corresponding value:
- Bq EACCES
- Search permission is denied for a component of the path prefix or the object exists and the process does not have appropriate access rights. Argument type specifies a type of ACL that cannot be associated with path_p .
- Bq EINVAL
- The argument type is not ACL_TYPE_ACCESS or ACL_TYPE_DEFAULT.
- Bq ENAMETOOLONG
- The length of the argument path_p is too long.
- Bq ENOENT
- The named object does not exist or the argument path_p points to an empty string.
- Bq ENOMEM
- The ACL working storage requires more memory than is allowed by the hardware or system-imposed memory management constraints.
- Bq ENOTDIR
- A component of the path prefix is not a directory.
- Bq ENOTSUP
- The file system on which the file identified by path_p is located does not support ACLs, or ACLs are disabled.
STANDARDS
IEEE Std 1003.1e draft 17 (POSIX.1e, abandoned)
SEE ALSO
AUTHOR
Derived from the FreeBSD manual pages written by Robert N M Watson Aq rwatson@FreeBSD.org , and adapted for Linux by Andreas Gruenbacher Aq a.gruenbacher@bestbits.at .