hush/util-linux/rdate.c
Denis Vlasenko 68404f13d4 *: add -Wunused-parameter; fix resulting breakage
function                                             old     new   delta
procps_scan                                         1265    1298     +33
aliascmd                                             278     283      +5
parse_file_cmd                                       116     120      +4
dname_enc                                            373     377      +4
setcmd                                                90      93      +3
execcmd                                               57      60      +3
count_lines                                           72      74      +2
process_command_subs                                 340     339      -1
test_main                                            409     407      -2
mknod_main                                           179     177      -2
handle_incoming_and_exit                            2653    2651      -2
argstr                                              1312    1310      -2
shiftcmd                                             131     128      -3
exitcmd                                               46      43      -3
dotcmd                                               297     294      -3
breakcmd                                              86      83      -3
evalpipe                                             353     349      -4
evalcommand                                         1180    1176      -4
evalcmd                                              109     105      -4
send_tree                                            374     369      -5
mkfifo_main                                           82      77      -5
evalsubshell                                         152     147      -5
typecmd                                               75      69      -6
letcmd                                                61      55      -6
add_cmd                                             1190    1183      -7
main                                                 891     883      -8
ash_main                                            1415    1407      -8
parse_stream                                        1377    1367     -10
alloc_procps_scan                                     55       -     -55
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 7/21 up/down: 54/-148)          Total: -94 bytes
   text    data     bss     dec     hex filename
 797195     658    7428  805281   c49a1 busybox_old
 797101     658    7428  805187   c4943 busybox_unstripped
2008-03-17 09:00:54 +00:00

72 lines
1.7 KiB
C

/* vi: set sw=4 ts=4: */
/*
* The Rdate command will ask a time server for the RFC 868 time
* and optionally set the system time.
*
* by Sterling Huxley <sterling@europa.com>
*
* Licensed under GPL v2 or later, see file License for details.
*/
#include "libbb.h"
enum { RFC_868_BIAS = 2208988800UL };
static void socket_timeout(int sig ATTRIBUTE_UNUSED)
{
bb_error_msg_and_die("timeout connecting to time server");
}
static time_t askremotedate(const char *host)
{
uint32_t nett;
int fd;
/* Add a timeout for dead or inaccessible servers */
alarm(10);
signal(SIGALRM, socket_timeout);
fd = create_and_connect_stream_or_die(host, bb_lookup_port("time", "tcp", 37));
if (safe_read(fd, (void *)&nett, 4) != 4) /* read time from server */
bb_error_msg_and_die("%s did not send the complete time", host);
close(fd);
/* convert from network byte order to local byte order.
* RFC 868 time is the number of seconds
* since 00:00 (midnight) 1 January 1900 GMT
* the RFC 868 time 2,208,988,800 corresponds to 00:00 1 Jan 1970 GMT
* Subtract the RFC 868 time to get Linux epoch
*/
return ntohl(nett) - RFC_868_BIAS;
}
int rdate_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int rdate_main(int argc ATTRIBUTE_UNUSED, char **argv)
{
time_t remote_time;
unsigned long flags;
opt_complementary = "-1";
flags = getopt32(argv, "sp");
remote_time = askremotedate(argv[optind]);
if ((flags & 2) == 0) {
time_t current_time;
time(&current_time);
if (current_time == remote_time)
bb_error_msg("current time matches remote time");
else
if (stime(&remote_time) < 0)
bb_perror_msg_and_die("cannot set time of day");
}
if ((flags & 1) == 0)
printf("%s", ctime(&remote_time));
return EXIT_SUCCESS;
}