2 * count.c: Count items for which statistics will be collected.
3 * (C) 1999-2016 by Sebastien GODARD (sysstat <at> orange.fr)
5 ***************************************************************************
6 * This program is free software; you can redistribute it and/or modify it *
7 * under the terms of the GNU General Public License as published by the *
8 * Free Software Foundation; either version 2 of the License, or (at your *
9 * option) any later version. *
11 * This program is distributed in the hope that it will be useful, but *
12 * WITHOUT ANY WARRANTY; without the implied warranty of MERCHANTABILITY *
13 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License *
16 * You should have received a copy of the GNU General Public License along *
17 * with this program; if not, write to the Free Software Foundation, Inc., *
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA *
19 ***************************************************************************
28 #include <sys/types.h>
30 #include <sys/statvfs.h>
39 #define _(string) gettext(string)
41 #define _(string) (string)
46 ***************************************************************************
47 * Count number of processors in /sys.
50 * @highest If set to TRUE, then look for the highest processor number.
51 * This is used when eg. the machine has 4 CPU numbered 0, 1, 4
52 * and 5. In this case, this procedure will return 6.
55 * Number of processors (online and offline).
56 * A value of 0 means that /sys was not mounted.
57 * A value of N (!=0) means N processor(s) (cpu0 .. cpu(N-1)).
58 ***************************************************************************
60 int get_sys_cpu_nr(int highest)
65 char line[MAX_PF_NAME];
66 int num_proc, proc_nr = -1;
68 /* Open relevant /sys directory */
69 if ((dir = opendir(SYSFS_DEVCPU)) == NULL)
72 /* Get current file entry */
73 while ((drd = readdir(dir)) != NULL) {
75 if (!strncmp(drd->d_name, "cpu", 3) && isdigit(drd->d_name[3])) {
76 snprintf(line, MAX_PF_NAME, "%s/%s", SYSFS_DEVCPU, drd->d_name);
77 line[MAX_PF_NAME - 1] = '\0';
78 if (stat(line, &buf) < 0)
80 if (S_ISDIR(buf.st_mode)) {
82 sscanf(drd->d_name + 3, "%d", &num_proc);
83 if (num_proc > proc_nr) {
101 ***************************************************************************
102 * Count number of processors in /proc/stat.
105 * Number of processors. The returned value is greater than or equal to the
106 * number of online processors.
107 * A value of 0 means one processor and non SMP kernel.
108 * A value of N (!=0) means N processor(s) (0 .. N-1) with SMP kernel.
109 ***************************************************************************
111 int get_proc_cpu_nr(void)
115 int num_proc, proc_nr = -1;
117 if ((fp = fopen(STAT, "r")) == NULL) {
118 fprintf(stderr, _("Cannot open %s: %s\n"), STAT, strerror(errno));
122 while (fgets(line, sizeof(line), fp) != NULL) {
124 if (strncmp(line, "cpu ", 4) && !strncmp(line, "cpu", 3)) {
125 sscanf(line + 3, "%d", &num_proc);
126 if (num_proc > proc_nr) {
139 ***************************************************************************
140 * Count the number of processors on the machine, or look for the
141 * highest processor number.
142 * Try to use /sys for that, or /proc/stat if /sys doesn't exist.
145 * @max_nr_cpus Maximum number of proc that sysstat can handle.
146 * @highest If set to TRUE, then look for the highest processor number.
147 * This is used when eg. the machine has 4 CPU numbered 0, 1, 4
148 * and 5. In this case, this procedure will return 6.
151 * Number of processors.
152 * 0: one proc and non SMP kernel.
153 * 1: one proc and SMP kernel (NB: On SMP machines where all the CPUs but
154 * one have been disabled, we get the total number of proc since we use
155 * /sys to count them).
157 ***************************************************************************
159 int get_cpu_nr(unsigned int max_nr_cpus, int highest)
163 if ((cpu_nr = get_sys_cpu_nr(highest)) == 0) {
164 /* /sys may be not mounted. Use /proc/stat instead */
165 cpu_nr = get_proc_cpu_nr();
168 if (cpu_nr > max_nr_cpus) {
169 fprintf(stderr, _("Cannot handle so many processors!\n"));
177 ***************************************************************************
178 * Find number of interrupts available per processor (use
179 * /proc/interrupts file or /proc/softirqs).
182 * @file /proc file to read (interrupts or softirqs).
183 * @max_nr_irqcpu Maximum number of interrupts per processor that
185 * @cpu_nr Number of processors.
188 * Number of interrupts per processor.
189 ***************************************************************************
191 int get_irqcpu_nr(char *file, int max_nr_irqcpu, int cpu_nr)
195 unsigned int irq = 0;
198 if ((fp = fopen(file, "r")) == NULL)
199 return 0; /* No interrupts file */
201 SREALLOC(line, char, INTERRUPTS_LINE + 11 * cpu_nr);
203 while ((fgets(line, INTERRUPTS_LINE + 11 * cpu_nr , fp) != NULL) &&
204 (irq < max_nr_irqcpu)) {
205 p = strcspn(line, ":");
206 if ((p > 0) && (p < 16)) {
219 ***************************************************************************
220 * Find number of devices and partitions available in /proc/diskstats.
223 * @count_part Set to TRUE if devices _and_ partitions are to be
225 * @only_used_dev When counting devices, set to TRUE if only devices
226 * with non zero stats must be counted.
229 * Number of devices (and partitions).
230 ***************************************************************************
232 int get_diskstats_dev_nr(int count_part, int only_used_dev)
236 char dev_name[MAX_NAME_LEN];
238 unsigned long rd_ios, wr_ios;
240 if ((fp = fopen(DISKSTATS, "r")) == NULL)
241 /* File non-existent */
245 * Counting devices and partitions is simply a matter of counting
246 * the number of lines...
248 while (fgets(line, sizeof(line), fp) != NULL) {
250 i = sscanf(line, "%*d %*d %s %lu %*u %*u %*u %lu",
251 dev_name, &rd_ios, &wr_ios);
252 if ((i == 2) || !is_device(dev_name, ACCEPT_VIRTUAL_DEVICES))
253 /* It was a partition and not a device */
255 if (only_used_dev && !rd_ios && !wr_ios)
268 /*---------------- BEGIN: FUNCTIONS USED BY SADC ONLY ---------------------*/
271 ***************************************************************************
272 * Count number of interrupts that are in /proc/stat file.
275 * Number of interrupts, including total number of interrupts.
276 ***************************************************************************
285 if ((fp = fopen(STAT, "r")) == NULL)
288 while (fgets(line, sizeof(line), fp) != NULL) {
290 if (!strncmp(line, "intr ", 5)) {
292 while (pos < strlen(line)) {
294 pos += strcspn(line + pos + 1, " ") + 1;
305 ***************************************************************************
306 * Find number of serial lines that support tx/rx accounting
307 * in /proc/tty/driver/serial file.
310 * Number of serial lines supporting tx/rx accouting.
311 ***************************************************************************
313 int get_serial_nr(void)
319 if ((fp = fopen(SERIAL, "r")) == NULL)
320 return 0; /* No SERIAL file */
322 while (fgets(line, sizeof(line), fp) != NULL) {
324 * tx/rx statistics are always present,
325 * except when serial line is unknown.
327 if (strstr(line, "tx:") != NULL) {
338 ***************************************************************************
339 * Find number of interfaces (network devices) that are in /proc/net/dev
343 * Number of network interfaces.
344 ***************************************************************************
346 int get_iface_nr(void)
352 if ((fp = fopen(NET_DEV, "r")) == NULL)
353 return 0; /* No network device file */
355 while (fgets(line, sizeof(line), fp) != NULL) {
356 if (strchr(line, ':')) {
367 ***************************************************************************
368 * Get number of devices in /proc/diskstats.
371 * @f Non zero (true) if disks *and* partitions should be counted, and
372 * zero (false) if only disks must be counted.
376 ***************************************************************************
378 int get_disk_nr(unsigned int f)
383 * Partitions are taken into account by sar -d only with
384 * kernels 2.6.25 and later.
386 disk_nr = get_diskstats_dev_nr(f, CNT_USED_DEV);
392 ***************************************************************************
393 * Count number of possible frequencies for CPU#0.
396 * Number of frequencies.
397 ***************************************************************************
399 int get_freq_nr(void)
402 char filename[MAX_PF_NAME];
406 snprintf(filename, MAX_PF_NAME, "%s/cpu0/%s",
407 SYSFS_DEVCPU, SYSFS_TIME_IN_STATE);
408 if ((fp = fopen(filename, "r")) == NULL)
409 return 0; /* No time_in_state file for CPU#0 */
411 while (fgets(line, sizeof(line), fp) != NULL) {
421 ***************************************************************************
422 * Count number of USB devices in /sys/bus/usb/devices.
425 * Number of USB devices plugged into the system.
426 * Don't count USB root hubs.
427 * Return -1 if directory doesn't exist in sysfs.
428 ***************************************************************************
436 /* Open relevant /sys directory */
437 if ((dir = opendir(SYSFS_USBDEV)) == NULL)
440 /* Get current file entry */
441 while ((drd = readdir(dir)) != NULL) {
443 if (isdigit(drd->d_name[0]) && !strchr(drd->d_name, ':')) {
448 /* Close directory */
455 ***************************************************************************
456 * Find number of filesystems in /etc/mtab. Pseudo-filesystems are ignored.
459 * Number of filesystems.
460 ***************************************************************************
462 int get_filesystem_nr(void)
465 char line[512], fs_name[MAX_FS_LEN], mountp[256];
469 if ((fp = fopen(MTAB, "r")) == NULL)
470 /* File non-existent */
473 /* Get current filesystem */
474 while (fgets(line, sizeof(line), fp) != NULL) {
475 if (line[0] == '/') {
477 /* Read filesystem name and mount point */
478 sscanf(line, "%127s", fs_name);
479 sscanf(strchr(line, ' ') + 1, "%255s", mountp);
481 /* Replace octal codes */
484 /* Check that total size is not zero */
485 if (statvfs(mountp, &buf) < 0)
500 ***************************************************************************
501 * Find number of fibre channel hosts in /sys/class/fc_host/.
504 * Number of FC hosts.
505 * Return -1 if directory doesn't exist in sysfs.
506 ***************************************************************************
508 int get_fchost_nr(void)
514 if ((dir = opendir(SYSFS_FCHOST)) == NULL) {
515 /* Directory non-existent */
519 while ((drd = readdir(dir)) != NULL) {
521 if (!strncmp(drd->d_name, "host", 4)) {
526 /* Close directory */
532 /*------------------ END: FUNCTIONS USED BY SADC ONLY ---------------------*/
533 #endif /* SOURCE_SADC */