2 * collectd - src/contextswitch.c
3 * Copyright (C) 2009 Patrik Weiskircher
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; only version 2 of the License is applicable.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 * Patrik Weiskircher <weiskircher at inqnet.at>
26 #ifdef HAVE_SYS_SYSCTL_H
27 # include <sys/sysctl.h>
31 /* no global variables */
32 /* #endif HAVE_SYSCTLBYNAME */
35 /* no global variables */
36 /* #endif KERNEL_LINUX */
39 # error "No applicable input method."
42 static void cs_submit (derive_t context_switches)
45 value_list_t vl = VALUE_LIST_INIT;
47 values[0].derive = (derive_t) context_switches;
51 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
52 sstrncpy (vl.plugin, "contextswitch", sizeof (vl.plugin));
53 sstrncpy (vl.type, "contextswitch", sizeof (vl.type));
55 plugin_dispatch_values (&vl);
58 static int cs_read (void)
63 size_t value_len = sizeof (value);
65 if (sysctlbyname ("vm.stats.sys.v_swtch", (void *) &value, &value_len,
73 ERROR("contextswitch plugin: sysctlbyname failed");
76 /* #endif HAVE_SYSCTLBYNAME */
84 fh = fopen ("/proc/stat", "r");
86 ERROR ("contextswitch plugin: unable to open /proc/stat: %s",
87 sstrerror (errno, buffer, sizeof (buffer)));
91 while (fgets(buffer, sizeof(buffer), fh) != NULL)
95 numfields = strsplit(buffer, fields, STATIC_ARRAY_SIZE (fields));
99 if (strcmp("ctxt", fields[0]) != 0)
104 result = (derive_t) strtoll (fields[1], &endptr, /* base = */ 10);
105 if ((endptr == fields[1]) || (errno != 0)) {
106 ERROR ("contextswitch plugin: Cannot parse ctxt value: %s",
119 ERROR ("contextswitch plugin: Unable to find context switch value.");
120 #endif /* KERNEL_LINUX */
125 void module_register (void)
127 plugin_register_read ("contextswitch", cs_read);
128 } /* void module_register */