/*

 * ProFTPD - FTP server daemon

 * Copyright (c) 2013-2016 The ProFTPD Project team

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 2 of the License, or

 * (at your option) any later version.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA.

 *

 * As a special exemption, The ProFTPD Project team and other respective

 * copyright holders give permission to link this program with OpenSSL, and

 * distribute the resulting executable, without including the source code for

 * OpenSSL in the source distribution.

 */

/* Resource limits implementation */

#include "conf.h"

static int get_rlimit(int resource, rlim_t *current, rlim_t *max) {

  struct rlimit rlim;

  int res;

  if (current == NULL &&

      max == NULL) {

    errno = EINVAL;

    return -1;

  }

  res = getrlimit(resource, &rlim);

  if (res < 0) {

    /* Some libcs use EPERM instead of ENOSYS; weird. */

    if (errno == EPERM) {

      errno = ENOSYS;

    }

    return res;

  }

  if (current != NULL) {

    *current = rlim.rlim_cur;

  }

  if (max != NULL) {

    *max = rlim.rlim_max;

  }

  return 0;

}

static int set_rlimit(int resource, rlim_t current, rlim_t max) {

  struct rlimit rlim;

  int res;

  rlim.rlim_cur = current;

  rlim.rlim_max = max;

  res = setrlimit(resource, &rlim);

  return res;

}

int pr_rlimit_get_core(rlim_t *current, rlim_t *max) {

#if defined(RLIMIT_CORE)

  return get_rlimit(RLIMIT_CORE, current, max);

#else

  errno = ENOSYS;

  return -1;

#endif /* No RLIMIT_CORE */

}

int pr_rlimit_set_core(rlim_t current, rlim_t max) {

#if defined(RLIMIT_CORE)

  return set_rlimit(RLIMIT_CORE, current, max);

#else

  errno = ENOSYS;

  return -1;

#endif /* No RLIMIT_CORE */

}

int pr_rlimit_get_cpu(rlim_t *current, rlim_t *max) {

#if defined(RLIMIT_CPU)

  return get_rlimit(RLIMIT_CPU, current, max);

#else

  errno = ENOSYS;

  return -1;

#endif /* No RLIMIT_CPU */

}

int pr_rlimit_set_cpu(rlim_t current, rlim_t max) {

#if defined(RLIMIT_CPU)

  return set_rlimit(RLIMIT_CPU, current, max);

#else

  errno = ENOSYS;

  return -1;

#endif /* No RLIMIT_CPU */

}

int pr_rlimit_get_files(rlim_t *current, rlim_t *max) {

#if defined(RLIMIT_NOFILE)

  return get_rlimit(RLIMIT_NOFILE, current, max);

#elif defined(RLIMIT_OFILE)

  return get_rlimit(RLIMIT_OFILE, current, max);

#else

  errno = ENOSYS;

  return -1;

#endif /* No RLIMIT_NOFILE or RLIMIT_OFILE */

}

int pr_rlimit_set_files(rlim_t current, rlim_t max) {

#if defined(RLIMIT_NOFILE)

  return set_rlimit(RLIMIT_NOFILE, current, max);

#elif defined(RLIMIT_OFILE)

  return set_rlimit(RLIMIT_OFILE, current, max);

#else

  errno = ENOSYS;

  return -1;

#endif /* No RLIMIT_NOFILE or RLIMIT_OFILE */

}

int pr_rlimit_get_memory(rlim_t *current, rlim_t *max) {

#if defined(RLIMIT_AS)

  return get_rlimit(RLIMIT_AS, current, max);

#elif defined(RLIMIT_DATA)

  return get_rlimit(RLIMIT_DATA, current, max);

#elif defined(RLIMIT_VMEM)

  return get_rlimit(RLIMIT_VMEM, current, max);

#else

  errno = ENOSYS;

  return -1;

#endif /* No RLIMIT_AS, RLIMIT_DATA, or RLIMIT_VMEM. */

}

int pr_rlimit_set_memory(rlim_t current, rlim_t max) {

#if defined(RLIMIT_AS)

  return set_rlimit(RLIMIT_AS, current, max);

#elif defined(RLIMIT_DATA)

  return set_rlimit(RLIMIT_DATA, current, max);

#else

  errno = ENOSYS;

  return -1;

#endif /* No RLIMIT_AS or RLIMIT_DATA */

}

int pr_rlimit_get_nproc(rlim_t *current, rlim_t *max) {

#if defined(RLIMIT_NPROC)

  return get_rlimit(RLIMIT_NPROC, current, max);

#else

  errno = ENOSYS;

  return -1;

#endif /* No RLIMIT_NPROC */

}

int pr_rlimit_set_nproc(rlim_t current, rlim_t max) {

#if defined(RLIMIT_NPROC)

  return set_rlimit(RLIMIT_NPROC, current, max);

#else

  errno = ENOSYS;

  return -1;

#endif /* No RLIMIT_NPROC */

}