/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-â
âvi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :viâ
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â Copyright 2022 Justine Alexandra Roberts Tunney                              â
â                                                                              â
â Permission to use, copy, modify, and/or distribute this software for         â
â any purpose with or without fee is hereby granted, provided that the         â
â above copyright notice and this permission notice appear in all copies.      â
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â THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                â
â WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                â
â WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             â
â AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         â
â DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        â
â PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               â
â TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             â
â PERFORMANCE OF THIS SOFTWARE.                                                â
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#include "libc/calls/landlock.h"
/*
#include "libc/intrin/strace.internal.h"

int sys_landlock_add_rule(int, enum landlock_rule_type, const void *, uint32_t);
*/

#include <sys/syscall.h>
#include <unistd.h>

/**
 * Adds new rule to Landlock ruleset.
 *
 * @error ENOSYS if Landlock isn't supported
 * @error EPERM if Landlock supported but SECCOMP BPF shut it down
 * @error EOPNOTSUPP if Landlock supported but disabled at boot time
 * @error EINVAL if flags not 0, or inconsistent access in the rule,
 *     i.e. landlock_path_beneath_attr::allowed_access is not a subset
 *     of the ruleset handled accesses
 * @error ENOMSG empty allowed_access
 * @error EBADF `fd` is not a file descriptor for current thread, or
 *     member of `rule_attr` is not a file descriptor as expected
 * @error EBADFD `fd` is not a ruleset file descriptor, or a member
 *     of `rule_attr` is not the expected file descriptor type
 * @error EPERM `fd` has no write access to the underlying ruleset
 * @error EFAULT `rule_attr` inconsistency
 */
int landlock_add_rule(int fd, enum landlock_rule_type rule_type,
                      const void *rule_attr, uint32_t flags) {
  int rc;
  rc = syscall(__NR_landlock_add_rule, fd, rule_type, rule_attr, flags);
  /*KERNTRACE("landlock_add_rule(%d, %d, %p, %#x) â %d% m", fd, rule_type,
            rule_attr, flags, rc);*/
  return rc;
}
