/* Get system load averages.  Linux (/proc/loadavg) version.

   Copyright (C) 1999-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or

   modify it under the terms of the GNU Lesser General Public

   License as published by the Free Software Foundation; either

   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library 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

   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public

   License along with the GNU C Library; if not, see

   <http://www.gnu.org/licenses/>.  */

#include <errno.h>

#include <fcntl.h>

#include <locale.h>

#include <stdlib.h>

#include <unistd.h>

#include <not-cancel.h>

/* Put the 1 minute, 5 minute and 15 minute load averages

   into the first NELEM elements of LOADAVG.

   Return the number written (never more than 3, but may be less than NELEM),

   or -1 if an error occurred.  */

int

getloadavg (double loadavg[], int nelem)

{

  int fd;

  fd = __open_nocancel ("/proc/loadavg", O_RDONLY);

  if (fd < 0)

    return -1;

  else

    {

      char buf[65], *p;

      ssize_t nread;

      int i;

      nread = __read_nocancel (fd, buf, sizeof buf - 1);

      __close_nocancel_nostatus (fd);

      if (nread <= 0)

	return -1;

      buf[nread - 1] = '\0';

      if (nelem > 3)

	nelem = 3;

      p = buf;

      for (i = 0; i < nelem; ++i)

	{

	  char *endp;

	  loadavg[i] = __strtod_l (p, &endp, _nl_C_locobj_ptr);

	  if (endp == p)

	    /* This should not happen.  The format of /proc/loadavg

	       must have changed.  Don't return with what we have,

	       signal an error.  */

	    return -1;

	  p = endp;

	}

      return i;

    }

}