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authorRoland McGrath <roland@gnu.org>1999-10-04 05:28:33 +0000
committerRoland McGrath <roland@gnu.org>1999-10-04 05:28:33 +0000
commit54e9386dfd4528492fe56512d81a02fc65e69fb6 (patch)
tree15c34fbefd1b7b918205f015337b10cd89173e62 /sysdeps/unix/sysv/linux/getloadavg.c
parentb73549de65de7a374622029bbaa63bcc63c5d48b (diff)
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* misc/Makefile (routines): Add getloadavg.
* sysdeps/generic/getloadavg.c: New file. * sysdeps/mach/getloadavg.c: New file. * sysdeps/unix/sysv/linux/getloadavg.c: New file.
Diffstat (limited to 'sysdeps/unix/sysv/linux/getloadavg.c')
-rw-r--r--sysdeps/unix/sysv/linux/getloadavg.c64
1 files changed, 64 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/getloadavg.c b/sysdeps/unix/sysv/linux/getloadavg.c
new file mode 100644
index 0000000000..1612ad2e56
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/getloadavg.c
@@ -0,0 +1,64 @@
+/* Get system load averages. Linux (/proc/loadavg) version.
+ Copyright (C) 1999 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 Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include <errno.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdlib.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 ("/proc/loadavg", O_RDONLY);
+ if (fd < 0)
+ return -1;
+ else
+ {
+ char buf[65], *p;
+ ssize_t nread;
+ int i;
+
+ nread = __read (fd, buf, sizeof buf - 1);
+ close (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 (p, &endp);
+ if (!endp || endp == p)
+ break;
+ p = endp;
+ }
+
+ return i;
+ }
+}