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#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <sys/sysinfo.h>
#include <sys/statvfs.h>
#include "info.h"
#define DFHASHSIZE 101
#define MOUNTS "/proc/mounts"
static const char *os_type = "Linux";
/* Internal Declarations */
struct nlist {
struct nlist *next;
char *name;
};
unsigned int DFhash(const char*);
struct nlist *seen_before(struct nlist**, const char*);
void DFcleanup(struct nlist**);
int remote_mount(const char*, const char*);
float device_space(struct nlist**, char*, char*, double*, double*);
/* Get information */
/*
get_os_type & get_os_release
/proc/sys/kernel
*/
const char *get_os_type(void) {
return os_type;
}
const char *get_os_release(void) {
return "";
}
unsigned int get_cpu_num(void) {
return get_nprocs();
}
/*
get_cpu_speed
/sys/devices/system/cpu/cpu0
*/
unsigned long get_cpu_speed(void) {
return 0;
}
/*
get_loadavg & get_proc_total
/proc/loadavg
*/
LoadAvg get_loadavg(void) {
static LoadAvg avg;
return avg;
}
unsigned long get_proc_total(void) {
return 0;
}
/*
get_mem_info
/proc/meminfo
*/
MemInfo get_mem_info(void) {
static MemInfo info;
return info;
}
DiskInfo get_disk_info(void) {
FILE *mounts;
char procline[1024];
struct nlist *DFhashvector[DFHASHSIZE] = {0};
char *mount, *device, *type, *mode, *other;
float thispct, max=0.0;
double dtotal=0.0, dfree=0.0;
DiskInfo di;
di.total = 0;
di.free = 0;
mounts = fopen(MOUNTS,"r");
if (!mounts) {
return di;
}
while ( fgets(procline, sizeof(procline), mounts) ) {
device = procline;
mount = index(procline, ' ');
if (mount == NULL) continue;
*mount++ = '\0';
type = index(mount, ' ');
if (type == NULL) continue;
*type++ = '\0';
mode = index(type, ' ');
if (mode == NULL) continue;
*mode++ = '\0';
other = index(mode, ' ');
if (other != NULL) *other = '\0';
if (!strncmp(mode, "ro", 2)) continue;
if (remote_mount(device, type)) continue;
if (strncmp(device, "/dev/", 5) != 0 &&
strncmp(device, "/dev2/", 6) != 0) continue;
thispct = device_space(DFhashvector, mount, device, &dtotal, &dfree);
if (!max || max<thispct)
max = thispct;
}
fclose(mounts);
DFcleanup(DFhashvector);
di.total = dtotal / 1000;
di.free = dfree / 1000;
return di;
}
/* Internal Definitions */
unsigned int DFhash(const char *s)
{
unsigned int hashval;
for (hashval=0; *s != '\0'; s++)
hashval = *s + 31 * hashval;
return hashval % DFHASHSIZE;
}
/* From K&R C book, pp. 144-145 */
struct nlist * seen_before(struct nlist **DFhashvector, const char *name)
{
struct nlist *found=0, *np;
unsigned int hashval;
/* lookup */
hashval=DFhash(name);
for (np=DFhashvector[hashval]; np; np=np->next) {
if (!strcmp(name,np->name)) {
found=np;
break;
}
}
if (!found) { /* not found */
np = (struct nlist *) malloc(sizeof(*np));
if (!np || !(np->name = (char *) strdup(name)))
return NULL;
np->next = DFhashvector[hashval];
DFhashvector[hashval] = np;
return NULL;
}
else /* found name */
return found;
}
void DFcleanup(struct nlist **DFhashvector)
{
struct nlist *np, *next;
int i;
for (i=0; i<DFHASHSIZE; i++) {
/* Non-standard for loop. Note the last clause happens at the end of the loop. */
for (np = DFhashvector[i]; np; np=next) {
next=np->next;
free(np->name);
free(np);
}
DFhashvector[i] = 0;
}
}
int remote_mount(const char *device, const char *type)
{
/* From ME_REMOTE macro in mountlist.h:
A file system is `remote' if its Fs_name contains a `:'
or if (it is of type smbfs and its Fs_name starts with `//'). */
return ((strchr(device,':') != 0)
|| (!strcmp(type, "smbfs") && device[0]=='/' && device[1]=='/')
|| (!strncmp(type, "nfs", 3)) || (!strcmp(type, "autofs"))
|| (!strcmp(type,"gfs")) || (!strcmp(type,"none")) );
}
float device_space(struct nlist **DFhashvector, char *mount, char *device, double *total_size, double *total_free)
{
struct statvfs svfs;
double blocksize;
double free;
double size;
/* The percent used: used/total * 100 */
float pct=0.0;
/* Avoid multiply-mounted disks - not done in df. */
if (seen_before(DFhashvector, device)) return pct;
if (statvfs(mount, &svfs)) {
/* Ignore funky devices... */
return pct;
}
free = svfs.f_bavail;
size = svfs.f_blocks;
blocksize = svfs.f_bsize;
/* Keep running sum of total used, free local disk space. */
*total_size += size * blocksize;
*total_free += free * blocksize;
/* The percentage of space used on this partition. */
pct = size ? ((size - free) / (float) size) * 100 : 0.0;
return pct;
}
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