acl_calc_mask man page on FreeBSD

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ACL_CALC_MASK(3)	 BSD Library Functions Manual	      ACL_CALC_MASK(3)

NAME
     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(3), acl_get_entry(3), acl_valid(3), posix1e(3)

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@fxp.org⟩.

BSD				March 10, 2001				   BSD
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