/ library calls / Acl_calc_mask - Calculate And Set ACL Mask Permissions


acl_calc_mask - calculate and set ACL mask permissions
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/types.h>
#include <sys/acl.h>

int
acl_calc_mask(acl_t *acl_p);
DESCRIPTION
The acl_calc_mask() function is a POSIX.1e call that calculates and set the permissions associated with the ACL_MASK ACL entry of the ACL referred to by acl_p.

The value of new permissions are the union of the permissions granted by the ACL_GROUP, ACL_GROUP_OBJ, ACL_USER tag types which match processes in the file group class contained in the ACL referred to by acl_p.

If the ACL referred to by acl_p already contains an ACL_MASK entry, its permissions shall be overwritten; if it does not contain an ACL_MASK entry, one shall be added.
RETURN VALUES
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
The acl_calc_mask() function fails if:
[EINVAL]
Argument acl_p does not point to a pointer to a valid ACL.
SEE ALSO
acl , acl_get_entry , acl_valid , posix1e
STANDARDS
POSIX.1e is described in IEEE POSIX.1e draft 17.
HISTORY
POSIX.1e support was introduced in FreeBSD 4.0. The acl_calc_mask() function was added in FreeBSD 5.0.
AUTHORS
The acl_calc_mask() function was written by Chris D. Faulhaber <jedgar [ät] fxp.org>.
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acl_calc_mask - calculate the file group class mask
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acl_add_perm - add permissions to a permission set
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