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#include <glibtop.h>
#include <glibtop/fsusage.h>
#include "glibtop_private.h"
#include <glib.h>
#include <mntent.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
void _glibtop_linux_get_fsusage_read_write(glibtop *server,
glibtop_fsusage *buf,
const char *path);
/*
* Linux 2.6.x
* linux/Documentation/iostats.txt
*/
static void linux_2_6_0(glibtop *server, glibtop_fsusage *buf, const char *path)
{
FILE *mtab = setmntent("/etc/mtab", "r");
struct mntent *emnt;
while((emnt = getmntent(mtab)) != NULL)
{
if(strcmp(emnt->mnt_dir, path) == 0)
{
char filename[64]; /* magic */
char buffer[1024]; /* magic */
char *p;
char device[32]; /* magic */
unsigned partition;
const char *devname = emnt->mnt_fsname;
size_t offset;
/*
we only deal with /dev block devices "/dev/<DEVICE><PARTITION>"
i don't know if other block devices such as network block
devices provide this kind of information.
*/
if(!g_str_has_prefix(devname, "/dev/"))
break;
/* skip the "/dev/" */
devname += sizeof "/dev/" - 1;
g_strlcpy(device, devname, sizeof device);
offset = strcspn(devname, "0123456789");
partition = strtoul(devname + offset, NULL, 0);
device[offset] = '\0';
if((size_t) g_snprintf(filename, sizeof filename,
"/sys/block/%s/%s%u/stat",
device, device, partition) >= sizeof filename)
break;
if(try_file_to_buffer(buffer, filename) < 0)
break;
p = buffer;
p = skip_token(p);
buf->read = strtoull(p, &p, 0);
p = skip_token(p);
buf->write = strtoull(p, &p, 0);
buf->flags |= (1 << GLIBTOP_FSUSAGE_READ) | (1 << GLIBTOP_FSUSAGE_WRITE);
break;
}
}
endmntent(mtab);
}
static void linux_2_4_0(glibtop *server, glibtop_fsusage *buf, const char *path)
{
}
void _glibtop_linux_get_fsusage_read_write(glibtop *server,
glibtop_fsusage *buf,
const char *path)
{
if(server->os_version_code >= LINUX_VERSION_CODE(2, 6, 0))
{
linux_2_6_0(server, buf, path);
}
else if(server->os_version_code >= LINUX_VERSION_CODE(2, 4, 0))
{
linux_2_4_0(server, buf, path);
}
}
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