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54e9386d | 1 | /* Get system load averages. Linux (/proc/loadavg) version. |
04277e02 | 2 | Copyright (C) 1999-2019 Free Software Foundation, Inc. |
54e9386d RM |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
54e9386d RM |
9 | |
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
54e9386d | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
54e9386d RM |
18 | |
19 | #include <errno.h> | |
54e9386d | 20 | #include <fcntl.h> |
84fb7c8c | 21 | #include <locale.h> |
54e9386d | 22 | #include <stdlib.h> |
84fb7c8c | 23 | #include <unistd.h> |
f1c30c98 | 24 | #include <not-cancel.h> |
54e9386d RM |
25 | |
26 | /* Put the 1 minute, 5 minute and 15 minute load averages | |
27 | into the first NELEM elements of LOADAVG. | |
28 | Return the number written (never more than 3, but may be less than NELEM), | |
29 | or -1 if an error occurred. */ | |
30 | ||
31 | int | |
32 | getloadavg (double loadavg[], int nelem) | |
33 | { | |
34 | int fd; | |
35 | ||
c2284574 | 36 | fd = __open_nocancel ("/proc/loadavg", O_RDONLY); |
54e9386d RM |
37 | if (fd < 0) |
38 | return -1; | |
39 | else | |
40 | { | |
41 | char buf[65], *p; | |
42 | ssize_t nread; | |
43 | int i; | |
44 | ||
a748eb31 | 45 | nread = __read_nocancel (fd, buf, sizeof buf - 1); |
c181840c | 46 | __close_nocancel_nostatus (fd); |
69a64e9b | 47 | if (nread <= 0) |
54e9386d RM |
48 | return -1; |
49 | buf[nread - 1] = '\0'; | |
50 | ||
51 | if (nelem > 3) | |
52 | nelem = 3; | |
53 | p = buf; | |
54 | for (i = 0; i < nelem; ++i) | |
55 | { | |
56 | char *endp; | |
4b5b009c | 57 | loadavg[i] = __strtod_l (p, &endp, _nl_C_locobj_ptr); |
69a64e9b | 58 | if (endp == p) |
b73c2df9 UD |
59 | /* This should not happen. The format of /proc/loadavg |
60 | must have changed. Don't return with what we have, | |
61 | signal an error. */ | |
62 | return -1; | |
54e9386d RM |
63 | p = endp; |
64 | } | |
65 | ||
66 | return i; | |
67 | } | |
68 | } |