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x SuSE Linux 13.1-RELEASEx
ACL_CALC_MASK(3) BSD Library Functions Manual ACL_CALC_MASK(3)
NAME
acl_calc_mask -- calculate the file group class mask
LIBRARY
Linux Access Control Lists library (libacl, -lacl).
SYNOPSIS
#include <sys/types.h>
#include <sys/acl.h>
int
acl_calc_mask(acl_t *acl_p);
DESCRIPTION
The acl_calc_mask() function calculates and sets the permissions associ-
ated with the ACL_MASK ACL entry of the ACL referred to by acl_p. The
value of the new permissions is the union of the permissions granted by
all entries of tag type ACL_GROUP, ACL_GROUP_OBJ, or ACL_USER. If the
ACL referred to by acl_p already contains an ACL_MASK entry, its permis-
sions are overwritten; if it does not contain an ACL_MASK entry, one is
added.
If the ACL referred to by acl_p does not contain enough space for the new
ACL entry, then additional working storage may be allocated. If the work-
ing storage cannot be increased in the current location, then it may be
relocated and the previous working storage is released and a pointer to
the new working storage is returned via acl_p.
The order of existing entries in the ACL is undefined after this func-
tion.
Any existing ACL entry descriptors that refer to entries in the ACL con-
tinue to refer to those entries. Any existing ACL pointers that refer to
the ACL referred to by acl_p continue to refer to the ACL.
RETURN VALUE
The acl_calc_mask() function returns the value 0 if successful; otherwise
the value -1 is returned and the global variable errno is set to indicate
the error.
ERRORS
If any of the following conditions occur, the acl_calc_mask() function
returns -1 and sets errno to the corresponding value:
[EINVAL] The argument acl is not a valid pointer to an ACL.
[ENOMEM] The acl_calc_mask() function is unable to allocate the
memory required for an ACL_MASK ACL entry.
STANDARDS
IEEE Std 1003.1e draft 17 ("POSIX.1e", abandoned)
SEE ALSO
acl_check(3), acl_get_entry(3), acl_valid(3), acl(5)
AUTHOR
Derived from the FreeBSD manual pages written by Robert N M Watson
<rwatson@FreeBSD.org>, and adapted for Linux by Andreas Gruenbacher
<a.gruenbacher@bestbits.at>.
Linux ACL March 23, 2002 Linux ACL
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