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/* Not particularly good interface to hal, for programs that used to use
* apm.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/wait.h>
#include <upower.h>
#include "apm.h"
#define MAX_RETRIES 3
struct context {
int current;
int needed;
guint state;
int percentage;
gboolean ac;
int time;
};
static void get_devinfo(gpointer device, gpointer result)
{
gboolean online;
gdouble percentage;
guint state;
guint kind;
gint64 time_to_empty;
gint64 time_to_full;
struct context *ctx = result;
g_object_get(G_OBJECT(device), "percentage", &percentage,
"online", &online,
"state", &state,
"kind", &kind,
"time-to-empty", &time_to_empty,
"time-to-full", &time_to_full,
NULL);
if (kind == UP_DEVICE_KIND_BATTERY) {
if (ctx->current == ctx->needed) {
ctx->percentage = (int)percentage;
ctx->state = state;
if (time_to_empty)
ctx->time = time_to_empty;
else
ctx->time = time_to_full;
}
ctx->current++;
} else if (kind == UP_DEVICE_KIND_LINE_POWER) {
ctx->ac |= online;
}
}
/* Fill the passed apm_info struct. */
static int upower_read_child(int battery, apm_info *info)
{
UpClient * up;
GPtrArray *devices = NULL;
up = up_client_new();
if (!up)
return -1;
#if !UP_CHECK_VERSION(0, 9, 99)
/* Allow a battery that was not present before to appear. */
up_client_enumerate_devices_sync(up, NULL, NULL);
#endif
devices = up_client_get_devices(up);
if (!devices)
return -1;
info->battery_flags = 0;
info->using_minutes = 0;
struct context ctx = {
.current = 0,
.needed = battery - 1,
.state = UP_DEVICE_STATE_UNKNOWN,
.percentage = -1,
.ac = FALSE,
.time = -1
};
g_ptr_array_foreach(devices, &get_devinfo, &ctx);
info->ac_line_status = ctx.ac;
/* remaining_time and charge_level.percentage are not a mandatory
* keys, so if not present, -1 will be returned */
info->battery_time = ctx.time;
info->battery_percentage = ctx.percentage;
if (ctx.state == UP_DEVICE_STATE_DISCHARGING) {
info->battery_status = BATTERY_STATUS_CHARGING;
/* charge_level.warning and charge_level.low are not
* required to be available; this is good enough */
if (info->battery_percentage < 1)
info->battery_status = BATTERY_STATUS_CRITICAL;
else if (info->battery_percentage < 10)
info->battery_status = BATTERY_STATUS_LOW;
} else if (info->ac_line_status && ctx.state == UP_DEVICE_STATE_CHARGING) {
info->battery_status = BATTERY_STATUS_CHARGING;
info->battery_flags = info->battery_flags | BATTERY_FLAGS_CHARGING;
} else if (info->ac_line_status) {
/* Must be fully charged. */
info->battery_status = BATTERY_STATUS_HIGH;
} else {
fprintf(stderr, "unknown battery state\n");
}
if (ctx.percentage < 0) {
info->battery_percentage = 0;
info->battery_time = 0;
info->battery_status = BATTERY_STATUS_ABSENT;
}
g_ptr_array_unref(devices);
return 0;
}
static int upower_read_work(int battery, apm_info *info)
{
int sp[2];
int child;
int status;
ssize_t cv;
if (socketpair(AF_UNIX, SOCK_DGRAM, 0, sp) < 0) {
fprintf(stderr, "socketpair: %s", strerror(errno));
goto fail;
}
child = fork();
if (child < 0) {
fprintf(stderr, "fork: %s", strerror(errno));
goto fail_close;
}
if (child == 0) {
/* child process does work, writes failure or result back to parent */
close(sp[0]);
status = upower_read_child(battery, info);
if (status < 0) {
cv = send(sp[1], &status, sizeof(status), 0);
}
else {
cv = send(sp[1], info, sizeof(*info), 0);
}
exit(cv < 0);
}
close(sp[1]);
child = waitpid(child, &status, 0);
if (child < 0) {
fprintf(stderr, "waitpid: %s status=%d", strerror(errno), status);
goto fail_close0;
}
cv = recv(sp[0], info, sizeof(*info), 0);
if (cv < 0) {
fprintf(stderr, "recv: %s", strerror(errno));
goto fail_close0;
}
else if (cv == sizeof(status)) {
memcpy(&status, info, sizeof(status));
goto fail_close0;
}
else if (cv != sizeof(*info)) {
fprintf(stderr, "recv: unexpected size %zd", cv);
goto fail_close0;
}
close(sp[0]);
return 0;
fail_close:
close(sp[1]);
fail_close0:
close(sp[0]);
fail:
return -1;
}
int upower_supported(void)
{
apm_info info;
return !(upower_read_work(1, &info) < 0);
}
int upower_read(int battery, apm_info *info)
{
static int retries = 0;
if (upower_read_work(battery, info) < 0) {
retries++;
if (retries < MAX_RETRIES)
return 0; /* fine immediately after hibernation */
else
return -1;
}
retries = 0;
return 0;
}
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