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Linux ACL
March 23, 2002


Access control list utilities, libraries and headers


access control list - static libraries and headers


Files needed for building programs with libacl


acl_get_file - get an ACL by filename


Linux Access Control Lists library (libacl, -lacl).


.In sys/types.h
.In sys/acl.h acl_t acl_get_file const char *path_p acl_type_t type


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(3) with the (void*)acl_t returned by acl_get_file as an argument.


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.


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:
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.
The argument type is not ACL_TYPE_ACCESS or ACL_TYPE_DEFAULT.
The length of the argument path_p is too long.
The named object does not exist or the argument path_p points to an empty string.
The ACL working storage requires more memory than is allowed by the hardware or system-imposed memory management constraints.
A component of the path prefix is not a directory.
The file system on which the file identified by path_p is located does not support ACLs, or ACLs are disabled.


IEEE Std 1003.1e draft 17 (\(lqPOSIX.1e\(rq, abandoned)


Derived from the FreeBSD manual pages written by
.An Robert N M Watson Aq , and adapted for Linux by
.An Andreas Gruenbacher Aq .
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