| /* Get system load averages. Linux (/proc/loadavg) version. |
| Copyright (C) 1999-2014 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_not_cancel_2 ("/proc/loadavg", O_RDONLY); |
| if (fd < 0) |
| return -1; |
| else |
| { |
| char buf[65], *p; |
| ssize_t nread; |
| int i; |
| |
| nread = read_not_cancel (fd, buf, sizeof buf - 1); |
| close_not_cancel_no_status (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; |
| } |
| } |