acl_create_entry(3) — Linux manual page


ACL_CREATE_ENTRY(3)     BSD Library Functions Manual     ACL_CREATE_ENTRY(3)

NAME         top

     acl_create_entry — create a new ACL entry

LIBRARY         top

     Linux Access Control Lists library (libacl, -lacl).

SYNOPSIS         top

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

     acl_create_entry(acl_t *acl_p, acl_entry_t *entry_p);

DESCRIPTION         top

     The acl_create_entry() function creates a new ACL entry in the ACL
     pointed to by the contents of the pointer argument acl_p.  On success,
     the function returns a descriptor for the new ACL entry via entry_p.

     This function may cause memory to be allocated.  The caller should free
     any releasable memory, when the new ACL is no longer required, by call‐
     ing acl_free(3) with (void*)*acl_p as an argument.  If the ACL working
     storage cannot be increased in the current location, then the working
     storage for the ACL pointed to by acl_p may be relocated and the previ‐
     ous working storage is released. A pointer to the new working storage
     is returned via acl_p.

     The components of the new ACL entry are initialized in the following
     ways: the ACL tag type component contains ACL_UNDEFINED_TAG, the quali‐
     fier component contains ACL_UNDEFINED_ID, and the set of permissions
     has no permissions enabled. Any existing ACL entry descriptors that
     refer to entries in the ACL continue to refer to those entries.

RETURN VALUE         top

     The acl_create_entry() function returns the value 0 if successful; oth‐
     erwise the value -1 is returned and the global variable errno is set to
     indicate the error.

ERRORS         top

     If any of the following conditions occur, the acl_create_entry() func‐
     tion returns -1 and sets errno to the corresponding value:

     [EINVAL]           The argument acl_p is not a valid pointer to an ACL.

     [ENOMEM]           The ACL working storage requires more memory than is
                        allowed by the hardware or system-imposed memory
                        management constraints.

STANDARDS         top

     IEEE Std 1003.1e draft 17 (“POSIX.1e”, abandoned)

SEE ALSO         top

     acl_init(3), acl_delete_entry(3), acl_free(3), acl_create_entry(3),

AUTHOR         top

     Derived from the FreeBSD manual pages written by Robert N M Watson
     <>, and adapted for Linux by Andreas Gruenbacher

COLOPHON         top

     This page is part of the acl (manipulating access control lists)
     project.  Information about the project can be found at  If you have a bug report for
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     This page was obtained from the project's upstream Git repository
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     the date of the most recent commit that was found in the repository was
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Linux ACL                      March 23, 2002                      Linux ACL