alcove

/* Copyright (c) 2014-2022, Michael Santos <michael.santos@gmail.com>
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#include "alcove.h"
#include "alcove_call.h"

#include "alcove_rlimit_constants.h"

/*
 * getrlimit(2)
 *
 */
ssize_t alcove_sys_getrlimit(alcove_state_t *ap, const char *arg, size_t len,
                             char *reply, size_t rlen) {
  int index = 0;
  int rindex = 0;

  int resource = 0;
  struct rlimit rlim = {0};
  int rv = 0;

  UNUSED(ap);

  /* resource */
  switch (alcove_decode_constant(arg, len, &index, &resource,
                                 alcove_rlimit_constants)) {
  case 0:
    break;
  case 1:
    return alcove_mk_error(reply, rlen, "enotsup");
  default:
    return -1;
  }

  rv = getrlimit(resource, &rlim);

  if (rv < 0)
    return alcove_mk_errno(reply, rlen, errno);

  ALCOVE_ERR(alcove_encode_version(reply, rlen, &rindex));
  ALCOVE_ERR(alcove_encode_tuple_header(reply, rlen, &rindex, 2));
  ALCOVE_ERR(alcove_encode_atom(reply, rlen, &rindex, "ok"));
  ALCOVE_ERR(alcove_encode_tuple_header(reply, rlen, &rindex, 3));
  ALCOVE_ERR(alcove_encode_atom(reply, rlen, &rindex, "alcove_rlimit"));
  ALCOVE_ERR(alcove_encode_ulonglong(reply, rlen, &rindex, rlim.rlim_cur));
  ALCOVE_ERR(alcove_encode_ulonglong(reply, rlen, &rindex, rlim.rlim_max));

  return rindex;
}