The acl_get_qualifier() function retrieves the qualifier from 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() is 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() is a pointer to type gid_t. If the tag type in the
ACL entry referred to by entry_d is a tag type for which a qualifier is
not supported, acl_get_qualifier() returns a value of (void *)NULL and
the function fails. Subsequent operations using the returned pointer
operate on an independent copy of the qualifier in working storage, and
will not change the qualifier of the ACL entry.
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 the void * value returned by
acl_get_qualifier() as an argument.
The argument entry_d and any other ACL entry descriptors that refer to
entries within the ACL containing the entry referred to by entry_d con‐
tinue to refer to those entries. The order of all existing entries in
the ACL containing the entry referred to by entry_d remains unchanged.
If any of the following conditions occur, the acl_get_qualifier() func‐
tion returns (void *)NULL and sets errno to the corresponding value:
[EINVAL] The argument entry_d is not a valid descriptor for
an ACL entry.
The value of the tag type in the ACL entry refer‐
enced by the argument entry_d is neither ACL_USER
[ENOMEM] The value to be returned requires more memory than
is allowed by the hardware or system-imposed memory
This page is part of the acl (manipulating access control lists)
project. Information about the project can be found at
http://savannah.nongnu.org/projects/acl. If you have a bug report for
this manual page, see http://savannah.nongnu.org/bugs/?group=acl. This
page was obtained from the project's upstream Git repository
git://git.savannah.nongnu.org/acl.git on 2017-03-13. If you discover
any rendering problems in this HTML version of the page, or you believe
there is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON (which
is not part of the original manual page), send a mail to
Linux ACL March 23, 2002 Linux ACL