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FreeBSD 11.0 - man page for acl_get_file (freebsd section 3)

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ACL_GET(3)			   BSD Library Functions Manual 		       ACL_GET(3)

NAME
     acl_get_fd, acl_get_fd_np, acl_get_file, acl_get_link_np -- get an ACL for a file

LIBRARY
     Standard C Library (libc, -lc)

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

     acl_t
     acl_get_fd(int fd);

     acl_t
     acl_get_fd_np(int fd, acl_type_t type);

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

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

DESCRIPTION
     The acl_get_fd(), acl_get_file(), acl_get_link_np(), and acl_get_fd_np() each allow the
     retrieval of an ACL from a file.  The acl_get_fd() is a POSIX.1e call that allows the
     retrieval of an ACL of type ACL_TYPE_ACCESS from a file descriptor.  The acl_get_fd_np()
     function is a non-portable form of acl_get_fd() that allows the retrieval of any type of ACL
     from a file descriptor.  The acl_get_file() function is a POSIX.1e call that allows the
     retrieval of a specified type of ACL from a file by name; acl_get_link_np() is a non-porta-
     ble variation on acl_get_file() which does not follow a symlink if the target of the call is
     a symlink.

     These functions 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 as an argument.

     The ACL in the working storage is an independent copy of the ACL associated with the object
     referred to by fd.  The ACL in the working storage shall not participate in any access con-
     trol decisions.

     Valid values for the type argument are:

	ACL_TYPE_ACCESS     POSIX.1e access ACL
	ACL_TYPE_DEFAULT    POSIX.1e default ACL
	ACL_TYPE_NFS4	    NFSv4 ACL

     The ACL returned will be branded accordingly.

IMPLEMENTATION NOTES
     FreeBSD's support for POSIX.1e interfaces and features is still under development at this
     time.

RETURN VALUES
     Upon successful completion, the function shall return a pointer to the ACL that was
     retrieved.  Otherwise, a value of (acl_t)NULL shall be returned, and errno shall be set to
     indicate the error.

ERRORS
     If any of the following conditions occur, the acl_get_fd() function shall return a value of
     (acl_t)NULL and set 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.

     [EBADF]		The fd argument is not a valid file descriptor.

     [EINVAL]		The ACL type passed is invalid for this file object.

     [ENAMETOOLONG]	A component of a pathname exceeded 255 characters, or an entire path name
			exceeded 1023 characters.

     [ENOENT]		The named object does not exist, or the path_p argument points to an
			empty string.

     [ENOMEM]		Insufficient memory available to fulfill request.

     [EOPNOTSUPP]	The file system does not support ACL retrieval.

SEE ALSO
     acl(3), acl_free(3), acl_get(3), acl_get_brand_np(3), acl_set(3), posix1e(3)

STANDARDS
     POSIX.1e is described in IEEE POSIX.1e draft 17.  Discussion of the draft continues on the
     cross-platform POSIX.1e implementation mailing list.  To join this list, see the FreeBSD
     POSIX.1e implementation page for more information.

HISTORY
     POSIX.1e support was introduced in FreeBSD 4.0, and development continues.

AUTHORS
     Robert N M Watson

BSD					  June 25, 2009 				      BSD
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