aslstatus/components/temperature.c

/* See LICENSE file for copyright and license details. */
#include <err.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include <dirent.h>
#include <limits.h>
#include <unistd.h>

#include "../lib/util.h"
#include "../aslstatus.h"

#define MAX_NAME  16
#define TEMP_FILE "temp1_input"
#define SYS_CLASS "/sys/class/hwmon"

static const char *GOOD_NAMES[] = {
	"coretemp",
	"acpitz",
	"k10temp",
	"fam15h_power",
};

void
temp(char		  *out,
     const char	*device,
     uint32_t __unused _i,
     static_data_t	   *static_data)
{
	DIR	    *d;
	struct dirent *dp;

	uint8_t i, found = 0;
	size_t	readed;
	int	name_fd;
	char	name[MAX_NAME];
	char	buf[JU_STR_SIZE + 3 /* zeros at the end */];
	int    *fd = static_data->data;

	if (!static_data->cleanup) static_data->cleanup = fd_cleanup;

	if (*fd > 0) {
		if (!fd_rewind(*fd)) ERRRET(out);
		goto get_temp;
	}

	if (!!device) {
		if (!sysfs_fd_or_rewind(fd, SYS_CLASS, device, TEMP_FILE))
			ERRRET(out);

		goto get_temp;
	}

	if (!(d = opendir(SYS_CLASS))) {
		warn("opendir(%s)", SYS_CLASS);
		ERRRET(out);
	}

	while ((dp = readdir(d))) {
		if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, ".."))
			continue;

		if ((name_fd = sysfs_fd(SYS_CLASS, dp->d_name, "name")) == -1)
			continue;

		if (!eread_ret(readed, name_fd, WITH_LEN(name))) {
			eclose(name_fd);
			continue;
		}

		/* remove last new line char */
		name[--readed] = '\0';

		for (i = 0; i < LEN(GOOD_NAMES); i++) {
			if (!strncmp(name, GOOD_NAMES[i], readed)) {
				if ((*fd = sysfs_fd(SYS_CLASS,
						    dp->d_name,
						    TEMP_FILE))
				    == -1)
					ERRRET(out);

				found = !0;
				goto end_loop;
			}
		}
	}
end_loop:
	closedir(d);

	if (!!found) {
	get_temp:
		if (!eread_ret(readed, *fd, WITH_LEN(buf))) ERRRET(out);

		if (readed > 4)
			readed -= 4; /* 3 zeros and '\n' at the end */
		else
			buf[(readed = 1) - 1] = '0';

		buf[readed] = '\0';
		bprintf(out, "%s", buf);
	}
}