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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <getopt.h>
#include <sys/socket.h>
#include <unistd.h>
#include "battery-util.h"
#include "build.h"
#include "constants.h"
#include "errno-util.h"
#include "glyph-util.h"
#include "fd-util.h"
#include "io-util.h"
#include "log.h"
#include "main-func.h"
#include "socket-util.h"
#include "terminal-util.h"
static void help(void) {
printf("%s\n\n"
"Checks battery level to see whether there's enough charge.\n\n"
" -h --help Show this help\n"
" --version Show package version\n",
program_invocation_short_name);
}
static void battery_check_send_plymouth_message(char *message, const char *mode) {
assert(message);
assert(mode);
int r;
static const union sockaddr_union sa = PLYMOUTH_SOCKET;
_cleanup_close_ int fd = -EBADF;
_cleanup_free_ char *plymouth_message = NULL;
int c = asprintf(&plymouth_message,
"C\x02%c%s%c"
"M\x02%c%s%c",
(int) strlen(mode) + 1, mode, '\x00',
(int) strlen(message) + 1, message, '\x00');
if (c < 0)
return (void) log_oom();
/* We set SOCK_NONBLOCK here so that we rather drop the
* message than wait for plymouth */
fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0);
if (fd < 0)
return (void) log_warning_errno(errno, "socket() failed: %m");
if (connect(fd, &sa.sa, SOCKADDR_UN_LEN(sa.un)) < 0)
return (void) log_full_errno(IN_SET(errno, EAGAIN, ENOENT) || ERRNO_IS_DISCONNECT(errno) ? LOG_DEBUG : LOG_WARNING, errno, "Connection to plymouth failed: %m");
r = loop_write(fd, plymouth_message, c, /* do_poll = */ false);
if (r < 0)
return (void) log_full_errno(IN_SET(r, -EAGAIN, -ENOENT) || ERRNO_IS_DISCONNECT(r) ?
LOG_DEBUG : LOG_WARNING, r, "Failed to write to plymouth, ignoring: %m");
}
static int parse_argv(int argc, char * argv[]) {
enum {
ARG_VERSION = 0x100,
};
static const struct option options[] = {
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, ARG_VERSION },
{}
};
int c;
assert(argc >= 0);
assert(argv);
while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
switch (c) {
case 'h':
help();
return 0;
case ARG_VERSION:
return version();
case '?':
return -EINVAL;
default:
assert_not_reached();
}
if (optind < argc)
return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
"%s takes no argument.",
program_invocation_short_name);
return 1;
}
static int run(int argc, char *argv[]) {
int r;
log_parse_environment();
log_open();
r = parse_argv(argc, argv);
if (r <= 0)
return r;
r = battery_is_discharging_and_low();
if (r < 0) {
log_warning_errno(r, "Failed to check battery status, ignoring: %m");
return 0;
}
if (r > 0) {
_cleanup_close_ int fd = -EBADF;
_cleanup_free_ char *message = NULL, *plymouth_message = NULL, *ac_message = NULL;
if (asprintf(&message, "%s Battery level critically low. Please connect your charger or the system will power off in 10 seconds.", special_glyph(SPECIAL_GLYPH_LOW_BATTERY)) < 0)
return log_oom();
if (asprintf(&plymouth_message, "%s Battery level critically low. Please connect your charger or the system will power off in 10 seconds.", special_glyph_force_utf(SPECIAL_GLYPH_LOW_BATTERY)) < 0)
return log_oom();
log_emergency("%s", message);
fd = open_terminal("/dev/console", O_WRONLY|O_NOCTTY|O_CLOEXEC);
if (fd < 0)
log_warning_errno(fd, "Failed to open console, ignoring: %m");
else
dprintf(fd, ANSI_HIGHLIGHT_RED "%s" ANSI_NORMAL "\n", message);
battery_check_send_plymouth_message(plymouth_message, "shutdown");
sleep(10);
r = battery_is_discharging_and_low();
if (r > 0) {
log_emergency("Battery level critically low, powering off.");
return r;
}
if (r < 0)
return log_warning_errno(r, "Failed to check battery status, ignoring: %m");
if (asprintf(&ac_message, "A.C. power restored, continuing") < 0)
return log_oom();
log_info("%s",ac_message);
dprintf(fd, "%s\n", ac_message);
battery_check_send_plymouth_message(ac_message, "boot-up");
}
return r;
}
DEFINE_MAIN_FUNCTION_WITH_POSITIVE_FAILURE(run);
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