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glibc/sysdeps/unix/sysv/linux/getloadavg.c
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/* Get system load averages. Linux (/proc/loadavg) version. | |
Copyright (C) 1999-2016 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; | |
} | |
} |