acl_get_qualifier man page on FreeBSD

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ACL_GET_QUALIFIER(3)	 BSD Library Functions Manual	  ACL_GET_QUALIFIER(3)

NAME
     acl_get_qualifier — retrieve the qualifier from an ACL entry

LIBRARY
     Standard C Library (libc, -lc)

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

     void *
     acl_get_qualifier(acl_entry_t entry_d);

DESCRIPTION
     The acl_get_qualifier() function is a POSIX.1e call that retrieves the
     qualifier of the tag for the ACL entry indicated by the argument entry_d
     into working storage and returns a pointer to that storage.

     If the value of the tag type in the ACL entry referred to by entry_d is
     ACL_USER, then the value returned by acl_get_qualifier() will be a
     pointer to type uid_t.

     If the value of the tag type in the ACL entry referred to by entry_d is
     ACL_GROUP, then the value returned by acl_get_qualifier() will be a
     pointer to type gid_t.

     If the value of the tag type in the ACL entry referred to by entry_d is
     ACL_UNDEFINED_TAG, ACL_USER_OBJ, ACL_GROUP_OBJ, ACL_OTHER, ACL_MASK, or
     an implementation-defined value for which a qualifier is not supported,
     then acl_get_qualifier() will return a value of (void *)NULL and the
     function will fail.

     This function may cause memory to be allocated.  The caller should free
     any releasable memory, when the new qualifier is no longer required, by
     calling acl_free() with void * as the argument.

RETURN VALUES
     The acl_get_qualifier() function returns a pointer to the allocated stor‐
     age if successful; otherwise a NULL pointer is returned and the global
     variable errno is set to indicate the error.

ERRORS
     The acl_get_qualifier() fails if:

     [EINVAL]		Argument entry_d does not point to a valid descriptor
			for an ACL entry.  The value of the tag type in the
			ACL entry referenced by argument entry_d is not
			ACL_USER or ACL_GROUP.

     [ENOMEM]		The value to be returned requires more memory than is
			allowed by the hardware or system-imposed memory man‐
			agement constraints.

SEE ALSO
     acl(3), acl_create_entry(3), acl_free(3), acl_get_entry(3),
     acl_get_tag_type(3), acl_set_qualifier(3), acl_set_tag_type(3),
     posix1e(3)

STANDARDS
     POSIX.1e is described in IEEE POSIX.1e draft 17.

HISTORY
     POSIX.1e support was introduced in FreeBSD 4.0.  The acl_get_qualifier()
     function was added in FreeBSD 5.0.

AUTHORS
     The acl_get_qualifier() function was written by Chris D. Faulhaber
     ⟨jedgar@fxp.org⟩.

BSD				March 13, 2001				   BSD
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