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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | STANDARDS | SEE ALSO | AUTHOR | COLOPHON |
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ACL_GET_ENTRY(3) Library Functions Manual ACL_GET_ENTRY(3)
acl_get_entry — get an ACL entry
Linux Access Control Lists library (libacl, -lacl).
<sys/types.h> <sys/acl.h> int acl_get_entry(acl_t acl, int
entry_id, acl_entry_t *entry_p)
The acl_get_entry() function obtains a descriptor for an ACL entry
as specified by entry_id within the ACL indicated by the argument
acl. If the value of entry_id is ACL_FIRST_ENTRY, then the
function returns in entry_p a descriptor for the first ACL entry
within acl. If the value of entry_id is ACL_NEXT_ENTRY, then the
function returns in entry_p a descriptor for the next ACL entry
within acl.
If a call is made to acl_get_entry() with entry_id set to
ACL_NEXT_ENTRY when there has not been either an initial
successful call to acl_get_entry(), or a previous successful call
to acl_get_entry() following a call to acl_calc_mask(),
acl_copy_int(), acl_create_entry(), acl_delete_entry(), acl_dup(),
acl_from_text(), acl_get_fd(), acl_get_file(), acl_set_fd(),
acl_set_file(), or acl_valid(), then the effect is unspecified.
Calls to acl_get_entry() do not modify any ACL entries. Subsequent
operations using the returned ACL entry descriptor operate on the
ACL entry within the ACL in working storage. The order of all
existing entries in the ACL remains unchanged. Any existing ACL
entry descriptors that refer to entries within the ACL continue to
refer to those entries. Any existing ACL pointers that refer to
the ACL referred to by acl continue to refer to the ACL.
If the function successfully obtains an ACL entry, the function
returns a value of 1. If the ACL has no ACL entries, the function
returns the value 0. If the value of entry_id is ACL_NEXT_ENTRY
and the last ACL entry in the ACL has already been returned by a
previous call to acl_get_entry(), the function returns the value 0
until a successful call with an entry_id of ACL_FIRST_ENTRY is
made. Otherwise, the value -1 is returned and errno is set to
indicate the error.
If any of the following conditions occur, the acl_get_entry()
function returns -1 and sets errno to the corresponding value:
[EINVAL] The argument acl_p is not a valid pointer to an
ACL.
The argument entry_id is neither ACL_NEXT_ENTRY
nor ACL_FIRST_ENTRY.
IEEE Std 1003.1e draft 17 (“POSIX.1e”, abandoned)
acl_calc_mask(3), acl_create_entry(3), acl_copy_entry(3),
acl_delete_entry(3), acl_get_file(3), acl(5)
Derived from the FreeBSD manual pages written by Robert N M Watson
<rwatson@FreeBSD.org>, and adapted for Linux by Andreas
Gruenbacher <andreas.gruenbacher@gmail.com>.
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 2025-08-11. (At that
time, the date of the most recent commit that was found in the
repository was 2025-05-12.) 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
man-pages@man7.org
Linux ACL March 23, 2002 ACL_GET_ENTRY(3)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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