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/* libxenstat: statistics-collection library for Xen
* Copyright (C) International Business Machines Corp., 2005
* Authors: Josh Triplett <josh@kernel.org>
* Judy Fischbach <jfisch@cs.pdx.edu>
* David Hendricks <cro_marmot@comcast.net>
*
* This 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.
*
* This 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.
*/
/*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <fcntl.h>
#include <dirent.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "xenstat_priv.h"
#define SYSFS_VBD_PATH "/sys/bus/xen-backend/devices"
struct priv_data {
FILE *procnetdev;
DIR *sysfsvbd;
};
static struct priv_data *
get_priv_data(xenstat_handle *handle)
{
if (handle->priv != NULL)
return handle->priv;
handle->priv = malloc(sizeof(struct priv_data));
if (handle->priv == NULL)
return (NULL);
((struct priv_data *)handle->priv)->procnetdev = NULL;
((struct priv_data *)handle->priv)->sysfsvbd = NULL;
return handle->priv;
}
/* Expected format of /proc/net/dev */
static const char PROCNETDEV_HEADER[] =
"Inter-| Receive |"
" Transmit\n"
" face |bytes packets errs drop fifo frame compressed multicast|"
"bytes packets errs drop fifo colls carrier compressed\n";
/* Collect information about networks */
int xenstat_collect_networks(xenstat_node * node)
{
struct priv_data *priv = get_priv_data(node->handle);
if (priv == NULL) {
perror("Allocation error");
return 0;
}
/* Open and validate /proc/net/dev if we haven't already */
if (priv->procnetdev == NULL) {
char header[sizeof(PROCNETDEV_HEADER)];
priv->procnetdev = fopen("/proc/net/dev", "r");
if (priv->procnetdev == NULL) {
perror("Error opening /proc/net/dev");
return 0;
}
/* Validate the format of /proc/net/dev */
if (fread(header, sizeof(PROCNETDEV_HEADER) - 1, 1,
priv->procnetdev) != 1) {
perror("Error reading /proc/net/dev header");
return 0;
}
header[sizeof(PROCNETDEV_HEADER) - 1] = '\0';
if (strcmp(header, PROCNETDEV_HEADER) != 0) {
fprintf(stderr,
"Unexpected /proc/net/dev format\n");
return 0;
}
}
/* Fill in networks */
/* FIXME: optimize this */
fseek(priv->procnetdev, sizeof(PROCNETDEV_HEADER) - 1,
SEEK_SET);
while (1) {
xenstat_domain *domain;
xenstat_network net;
unsigned int domid;
int ret = fscanf(priv->procnetdev,
"vif%u.%u:%llu%llu%llu%llu%*u%*u%*u%*u"
"%llu%llu%llu%llu%*u%*u%*u%*u\n",
&domid, &net.id,
&net.tbytes, &net.tpackets, &net.terrs,
&net.tdrop,
&net.rbytes, &net.rpackets, &net.rerrs,
&net.rdrop);
if (ret == EOF)
break;
if (ret != 10) {
unsigned int c;
do {
c = fgetc(priv->procnetdev);
} while (c != '\n' && c != EOF);
if (c == EOF)
break;
continue;
}
/* FIXME: this does a search for the domid */
domain = xenstat_node_domain(node, domid);
if (domain == NULL) {
fprintf(stderr,
"Found interface vif%u.%u but domain %u"
" does not exist.\n", domid, net.id,
domid);
continue;
}
if (domain->networks == NULL) {
domain->num_networks = 1;
domain->networks = malloc(sizeof(xenstat_network));
} else {
struct xenstat_network *tmp;
domain->num_networks++;
tmp = realloc(domain->networks,
domain->num_networks *
sizeof(xenstat_network));
if (tmp == NULL)
free(domain->networks);
domain->networks = tmp;
}
if (domain->networks == NULL)
return 0;
domain->networks[domain->num_networks - 1] = net;
}
return 1;
}
/* Free network information in handle */
void xenstat_uninit_networks(xenstat_handle * handle)
{
struct priv_data *priv = get_priv_data(handle);
if (priv != NULL && priv->procnetdev != NULL)
fclose(priv->procnetdev);
}
static int read_attributes_vbd(const char *vbd_directory, const char *what, char *ret, int cap)
{
static char file_name[80];
int fd, num_read;
snprintf(file_name, sizeof(file_name), "%s/%s/%s",
SYSFS_VBD_PATH, vbd_directory, what);
fd = open(file_name, O_RDONLY, 0);
if (fd==-1) return -1;
num_read = read(fd, ret, cap - 1);
close(fd);
if (num_read<=0) return -1;
ret[num_read] = '\0';
return num_read;
}
/* Collect information about VBDs */
int xenstat_collect_vbds(xenstat_node * node)
{
struct dirent *dp;
struct priv_data *priv = get_priv_data(node->handle);
if (priv == NULL) {
perror("Allocation error");
return 0;
}
if (priv->sysfsvbd == NULL) {
priv->sysfsvbd = opendir(SYSFS_VBD_PATH);
if (priv->sysfsvbd == NULL) {
perror("Error opening " SYSFS_VBD_PATH);
return 0;
}
}
rewinddir(priv->sysfsvbd);
for(dp = readdir(priv->sysfsvbd); dp != NULL ;
dp = readdir(priv->sysfsvbd)) {
xenstat_domain *domain;
xenstat_vbd vbd;
unsigned int domid;
int ret;
char buf[256];
ret = sscanf(dp->d_name, "%3s-%u-%u", buf, &domid, &vbd.dev);
if (ret != 3)
continue;
if (strcmp(buf,"vbd") == 0)
vbd.back_type = 1;
else if (strcmp(buf,"tap") == 0)
vbd.back_type = 2;
else
continue;
domain = xenstat_node_domain(node, domid);
if (domain == NULL) {
fprintf(stderr,
"Found interface %s-%u-%u but domain %u"
" does not exist.\n",
buf, domid, vbd.dev, domid);
continue;
}
if((read_attributes_vbd(dp->d_name, "statistics/oo_req", buf, 256)<=0)
|| ((ret = sscanf(buf, "%llu", &vbd.oo_reqs)) != 1))
{
continue;
}
if((read_attributes_vbd(dp->d_name, "statistics/rd_req", buf, 256)<=0)
|| ((ret = sscanf(buf, "%llu", &vbd.rd_reqs)) != 1))
{
continue;
}
if((read_attributes_vbd(dp->d_name, "statistics/wr_req", buf, 256)<=0)
|| ((ret = sscanf(buf, "%llu", &vbd.wr_reqs)) != 1))
{
continue;
}
if((read_attributes_vbd(dp->d_name, "statistics/rd_sect", buf, 256)<=0)
|| ((ret = sscanf(buf, "%llu", &vbd.rd_sects)) != 1))
{
continue;
}
if((read_attributes_vbd(dp->d_name, "statistics/wr_sect", buf, 256)<=0)
|| ((ret = sscanf(buf, "%llu", &vbd.wr_sects)) != 1))
{
continue;
}
if (domain->vbds == NULL) {
domain->num_vbds = 1;
domain->vbds = malloc(sizeof(xenstat_vbd));
} else {
domain->num_vbds++;
domain->vbds = realloc(domain->vbds,
domain->num_vbds *
sizeof(xenstat_vbd));
}
if (domain->vbds == NULL)
return 0;
domain->vbds[domain->num_vbds - 1] = vbd;
}
return 1;
}
/* Free VBD information in handle */
void xenstat_uninit_vbds(xenstat_handle * handle)
{
struct priv_data *priv = get_priv_data(handle);
if (priv != NULL && priv->sysfsvbd != NULL)
closedir(priv->sysfsvbd);
}
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