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#include <string.h>
#include <stdio.h>
#include <assert.h>
#include <stdlib.h>
#include "../block.h"
#include "../format.h"
#include "../any_log.h"
typedef struct {
block_text_t block;
format_t format;
} block_ram_t;
typedef enum {
RAM_STRING = 0,
RAM_TOTAL,
RAM_FREE,
RAM_USED,
RAM_FREE_PERC,
RAM_USED_PERC,
} block_ram_mark_t;
#define RAM_SHIFT 12
static const format_pair_t block_ram_units[] = {
{ "-si", UNIT_SI << RAM_SHIFT },
{ "-b", UNIT_B << RAM_SHIFT },
{ "-kib", UNIT_KB << RAM_SHIFT },
{ "-mib", UNIT_MB << RAM_SHIFT },
{ "-gib", UNIT_GB << RAM_SHIFT },
{ "-tib", UNIT_TB << RAM_SHIFT },
{ "-kb", (UNIT_KB | UNIT_SI) << RAM_SHIFT },
{ "-mb", (UNIT_MB | UNIT_SI) << RAM_SHIFT },
{ "-gb", (UNIT_GB | UNIT_SI) << RAM_SHIFT },
{ "-tb", (UNIT_TB | UNIT_SI) << RAM_SHIFT },
{ NULL },
};
static const format_option_t block_ram_options[] = {
{ { "total", RAM_TOTAL }, .suffixes = block_ram_units },
{ { "free", RAM_FREE }, .suffixes = block_ram_units },
{ { "used", RAM_USED }, .suffixes = block_ram_units },
{ { "free-percentage", RAM_FREE_PERC } },
{ { "used-percentage", RAM_USED_PERC } },
{ { NULL } },
};
static const struct timespec block_ram_interval = {
.tv_sec = 1,
.tv_nsec = 0,
};
static void block_ram_update(block_t *block)
{
const char *path = "/proc/meminfo";
FILE *meminfo = fopen(path, "rb");
if (meminfo == NULL) {
log_value_debug("Failed to open meminfo",
"s:label", block->label,
"s:path", path,
"i:errno", errno);
return;
}
uintmax_t total, unused, available, buffers, cached;
int n = fscanf(meminfo,
"MemTotal: %ju kB\n"
"MemFree: %ju kB\n"
"MemAvailable: %ju kB\n"
"Buffers: %ju kB\n"
"Cached: %ju kB\n",
&total, &unused, &available, &buffers, &cached);
fclose(meminfo);
if (n != 5) {
log_value_debug("Failed to read meminfo",
"s:label", block->label,
"i:errno", errno);
return;
}
block_ram_t *ram = (block_ram_t *)block;
char buffer[256] = { 0 };
size_t start = 0, size = sizeof(buffer);
for (size_t i = 0; i < ram->format.length; i++) {
size_t rest = start >= size ? 0 : size - start;
if (rest == 0) break;
unit_t mask = UNIT_MASK << RAM_SHIFT;
unit_t unit = (ram->format.parts[i].mark & mask) >> RAM_SHIFT;
switch (ram->format.parts[i].mark & ~mask) {
case RAM_STRING:
start += snprintf(buffer + start, rest, "%s", ram->format.parts[i].string);
break;
case RAM_TOTAL:
start += snprintf_units(buffer + start, rest, total * 1024, unit);
break;
case RAM_FREE:
start += snprintf_units(buffer + start, rest, available * 1024, unit);
break;
case RAM_USED:
start += snprintf_units(buffer + start, rest, (total - available) * 1024, unit);
break;
case RAM_FREE_PERC:
start += snprintf(buffer + start, rest, "%ld", 100 * available / total);
break;
case RAM_USED_PERC:
start += snprintf(buffer + start, rest, "%ld", 100 * (total - available) / total);
break;
default:
unreachable();
}
}
free(ram->block.text);
ram->block.text = strcopy(buffer);
assert(ram->block.text != NULL);
}
static void block_ram_init(block_t *block, const block_scheme_t *scheme)
{
extern const block_scheme_t block_text_scheme;
block_text_scheme.init_fn(block, scheme);
block->update_interval = block_ram_interval;
block->update_fn = block_ram_update;
}
static void block_ram_clean(block_t *block)
{
block_ram_t *ram = (block_ram_t *)block;
format_free(&ram->format);
free(ram->block.text);
}
static int block_ram_validate(block_t *block, const block_scheme_t *scheme)
{
block_ram_t *ram = (block_ram_t *)block;
int errors = 0;
if (ram->block.text == NULL) {
log_error("Block '%s' requires key '%s'", block->label, "text");
errors++;
}
if (!format_init(&ram->format, ram->block.text, '%')) {
log_error("Block '%s' has an invalid format", block->label);
errors++;
} else {
int marked = format_remark(&ram->format, block->label, block_ram_options);
if (marked < 0)
errors += -marked;
if (marked == 0) {
log_warn("Block '%s' does not use any ram option", block->label);
block->update_fn = NULL;
log_debug("Disabled updates for block '%s'", block->label);
}
}
return errors;
}
const block_scheme_t block_ram_scheme = {
.name = "ram",
.entries = NULL,
.size = sizeof(block_ram_t),
.init_fn = block_ram_init,
.clean_fn = block_ram_clean,
.validate_fn = block_ram_validate,
};
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