/*-*- 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
â                                                                              â
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
ââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââââ*/
#include "libc/calls/calls.h"
#include "libc/calls/sched-sysv.internal.h"
#include "libc/dce.h"
#include "libc/intrin/describeflags.internal.h"
#include "libc/intrin/strace.internal.h"
#include "libc/sysv/consts/sched.h"
#include "libc/sysv/errfuns.h"

static int sys_sched_get_priority_min_netbsd(int policy) {
  if (policy == SCHED_OTHER) {
    return -1;
  } else if (policy == SCHED_RR || policy == SCHED_FIFO) {
    return 0;  // NetBSD Libc needs 19 system calls to compute this!
  } else {
    return einval();
  }
}

/**
 * Returns minimum `sched_param::sched_priority` for `policy`.
 *
 * @return priority, or -1 w/ errno
 * @raise ENOSYS on XNU, Windows, OpenBSD
 * @raise EINVAL if `policy` is invalid
 */
int sched_get_priority_min(int policy) {
  int rc;
  if (IsNetbsd()) {
    rc = sys_sched_get_priority_min_netbsd(policy);
  } else {
    rc = sys_sched_get_priority_min(policy);
  }
  STRACE("sched_get_priority_min(%s) â %d% m", DescribeSchedPolicy(policy), rc);
  return rc;
}
