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/*
* capi-system-device
* Copyright (c) 2012 Samsung Electronics Co., Ltd.
*
* Licensed under the Apache License, Version 2.0 (the License);
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "device.h"
#include "device_log.h"
#define PROC_MEMORY "/proc/meminfo"
enum {
_MI_TOTAL,
_MI_FREE,
_MI_BUF,
_MI_CACHED,
_MI_SWAP,
_MI_SHMEM,
_MI_MAX,
};
struct meminfo {
unsigned long l[_MI_MAX];
};
static const char *_mi_str[] = {
[_MI_TOTAL] = "MemTotal",
[_MI_FREE] = "MemFree",
[_MI_BUF] = "Buffers",
[_MI_CACHED] = "Cached",
[_MI_SWAP] = "SwapCached",
[_MI_SHMEM] = "Shmem",
};
static inline int _get_idx(const char *name)
{
int i;
for (i = 0; i < sizeof(_mi_str)/sizeof(_mi_str[0]); ++i) {
if (name && _mi_str[i] && !strcmp(name, _mi_str[i]))
return i;
}
return -1;
}
static int _get_meminfo(struct meminfo *mi)
{
FILE *fp;
char buf[4096];
char *s, *name, *num;
int idx;
assert(mi);
fp = fopen(PROC_MEMORY, "r");
if (!fp)
return -1;
memset(mi, 0, sizeof(*mi));
while (!feof(fp)) {
s = fgets(buf, sizeof(buf), fp);
if (!s)
break;
s = strchr(buf, ':');
if (!s)
continue;
*s = '\0';
name = buf;
s++;
while (*s == ' ')
s++;
num = s;
idx = _get_idx(name);
if (idx < 0)
continue;
mi->l[idx] = strtol(num, NULL, 10);
}
fclose(fp);
return 0;
}
int device_memory_get_total(unsigned int *total_mem)
{
struct meminfo mi;
int ret;
if (total_mem == NULL)
return DEVICE_ERROR_INVALID_PARAMETER;
ret = _get_meminfo(&mi);
if (ret < 0)
return DEVICE_ERROR_OPERATION_FAILED;
*total_mem = mi.l[_MI_TOTAL];
return DEVICE_ERROR_NONE;
}
int device_memory_get_available(unsigned int *avail_mem)
{
struct meminfo mi;
int ret;
if (avail_mem == NULL)
return DEVICE_ERROR_INVALID_PARAMETER;
ret = _get_meminfo(&mi);
if (ret < 0)
return DEVICE_ERROR_OPERATION_FAILED;
*avail_mem = mi.l[_MI_FREE] + mi.l[_MI_BUF] + mi.l[_MI_CACHED] + mi.l[_MI_SWAP] - mi.l[_MI_SHMEM];
return DEVICE_ERROR_NONE;
}
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