ACL_GET_FILE(3)

NAME

acl_get_file -- get an ACL by filename

LIBRARY

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

SYNOPSIS

#include <sys/types.h>
#include <sys/acl.h>

acl_t
acl_get_file(const char *path_p, acl_type_t type);

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(3) 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:

[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.
[EINVAL] The argument type is not ACL_TYPE_ACCESS or
ACL_TYPE_DEFAULT.
[ENAMETOOLONG] The length of the argument path_p is too long.
[ENOENT] The named object does not exist or the argument path_p
points to an empty string.
[ENOMEM] The ACL working storage requires more memory than is
allowed by the hardware or system-imposed memory management constraints.
[ENOTDIR] A component of the path prefix is not a directory.
[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

acl_free(3), acl_get_entry(3), acl_get_fd(3), acl_set_file(3), acl(5)

AUTHOR

Derived from the FreeBSD manual pages written by Robert N M Watson
<rwatson@FreeBSD.org>, and adapted for Linux by Andreas Gruenbacher
<a.gruenbacher@bestbits.at>.
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