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/* acpi.c - show power state
* Written by Isaac Dunham, 2013
* No standard.
USE_ACPI(NEWTOY(acpi, "ab", TOYFLAG_USR|TOYFLAG_BIN))
config ACPI
bool "acpi"
default n
help
usage: acpi [-ab]
Show status of power sources.
-a show power adapters
-b show batteries
*/
#define FOR_acpi
#include "toys.h"
GLOBALS(
int ac;
int bat;
)
int read_int_at(int dirfd, char *name) {
int fd, ret=0;
if ((fd=openat(dirfd, name, O_RDONLY)) < 0)
return -1;
FILE * fil = xfdopen(fd, "r");
fscanf(fil, "%d", &ret);
fclose(fil);
return ret;
}
int acpi_callback(struct dirtree *tree)
{
errno = 0;
if (tree->name[0]=='.')
return 0;
if (strlen(dirtree_path(tree, NULL)) < 26) {
return (DIRTREE_RECURSE | DIRTREE_SYMFOLLOW);
}
int dfd=open(dirtree_path(tree, NULL), O_RDONLY);
if (dfd > 0) {
int fd;
if ((fd = openat(dfd, "type", O_RDONLY)) < 0) {
close(dfd);
return 0;
}
read(fd, toybuf, 4096);
close(fd);
if (0 == strncmp(toybuf, "Battery", 7)) {
if (toys.optflags & FLAG_b || (!toys.optflags)) {
int cap = 0, curr = 0, max = 0;
if ((cap = read_int_at(dfd, "capacity")) < 0) {
if ((max = read_int_at(dfd, "charge_full")) > 0) {
curr = read_int_at(dfd, "charge_now");
} else if ((max = read_int_at(dfd, "energy_full")) > 0) {
curr = read_int_at(dfd, "energy_now");
}
if (max > 0 && (curr >= 0))
cap = 100 * curr / max;
}
if (cap >= 0) printf("Battery %d: %d%%\n", TT.bat++, cap);
}
} else {
//ac
if (toys.optflags & FLAG_a) {
int on;
if ((on = read_int_at(dfd, "online")) >= 0)
printf("Adapter %d: %s-line\n", TT.ac++, (on ? "on" : "off"));
}
}
close(dfd);
}
return 0;
}
void acpi_main(void)
{
dirtree_read("/sys/class/power_supply", acpi_callback);
}
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