01-12-2009
Or you could simply change the permission on it to read only.
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LEARN ABOUT FREEBSD
acl_add_perm
ACL_ADD_PERM(3) BSD Library Functions Manual ACL_ADD_PERM(3)
NAME
acl_add_perm -- add permissions to a permission set
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <sys/types.h>
#include <sys/acl.h>
int
acl_add_perm(acl_permset_t permset_d, acl_perm_t perm);
DESCRIPTION
The acl_add_perm() function is a POSIX.1e call that adds the permission contained in perm to the permission set permset_d.
Note: it is not considered an error to attempt to add permissions that already exist in the permission set.
For POSIX.1e ACLs, valid values are:
ACL_EXECUTE Execute permission
ACL_WRITE Write permission
ACL_READ Read permission
For NFSv4 ACLs, valid values are:
ACL_READ_DATA Read permission
ACL_LIST_DIRECTORY Same as ACL_READ_DATA
ACL_WRITE_DATA Write permission, or permission to create files
ACL_ADD_FILE Same as ACL_READ_DATA
ACL_APPEND_DATA Permission to create directories. Ignored for files
ACL_ADD_SUBDIRECTORY Same as ACL_APPEND_DATA
ACL_READ_NAMED_ATTRS Ignored
ACL_WRITE_NAMED_ATTRS Ignored
ACL_EXECUTE Execute permission
ACL_DELETE_CHILD Permission to delete files and subdirectories
ACL_READ_ATTRIBUTES Permission to read basic attributes
ACL_WRITE_ATTRIBUTES Permission to change basic attributes
ACL_DELETE Permission to delete the object this ACL is placed on
ACL_READ_ACL Permission to read ACL
ACL_WRITE_ACL Permission to change the ACL and file mode
ACL_SYNCHRONIZE Ignored
Calling acl_add_perm() with perm equal to ACL_WRITE or ACL_READ brands the ACL as POSIX. Calling it with ACL_READ_DATA, ACL_LIST_DIRECTORY,
ACL_WRITE_DATA, ACL_ADD_FILE, ACL_APPEND_DATA, ACL_ADD_SUBDIRECTORY, ACL_READ_NAMED_ATTRS, ACL_WRITE_NAMED_ATTRS, ACL_DELETE_CHILD,
ACL_READ_ATTRIBUTES, ACL_WRITE_ATTRIBUTES, ACL_DELETE, ACL_READ_ACL, ACL_WRITE_ACL or ACL_SYNCHRONIZE brands the ACL as NFSv4.
RETURN VALUES
The acl_add_perm() 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_add_perm() function fails if:
[EINVAL] Argument permset_d is not a valid descriptor for a permission set within an ACL entry. Argument perm does not contain a
valid acl_perm_t value. ACL is already branded differently.
SEE ALSO
acl(3), acl_clear_perms(3), acl_delete_perm(3), acl_get_brand_np(3), acl_get_permset(3), acl_set_permset(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_add_perm() function was added in FreeBSD 5.0.
AUTHORS
The acl_add_perm() function was written by Chris D. Faulhaber <jedgar@fxp.org>.
BSD
June 25, 2009 BSD