Проект OpenNet: MAN acl_get_qualifier (3) Библиотечные вызовы (FreeBSD и Linux)

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acl_get_qualifier (3)

>> acl_get_qualifier (3) ( FreeBSD man: Библиотечные вызовы )

acl_get_qualifier (3) ( Linux man: Библиотечные вызовы )

BSD mandoc

NAME



acl_get_qualifier

 - retrieve the qualifier from an ACL entry

LIBRARY

Lb libc

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 Fa 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 Fa entry_d is ACL_USER then the value returned by acl_get_qualifier ();
will be a pointer to type Vt uid_t .

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

If the value of the tag type in the ACL entry referred to by Fa 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 Vt ( void * ) Ns Dv 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 Vt void * as the argument.

RETURN VALUES

The acl_get_qualifier ();
function returns a pointer to the allocated storage 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:

Bq Er EINVAL: Argument Fa 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 Fa entry_d is not ACL_USER or ACL_GROUP
Bq Er ENOMEM: The value to be returned requires more memory than is allowed by the hardware or system-imposed memory management constraints.