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rdate: tweak comments, no code changes

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2017-07-27 14:31:59 +02:00
parent 1d8df52d45
commit e9a5a6985c
1 changed files with 4 additions and 5 deletions
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9
util-linux/rdate.c
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@ -41,7 +41,7 @@ static time_t askremotedate(const char *host)
uint32_t nett; uint32_t nett;
int fd; int fd;
/* Add a timeout for dead or inaccessible servers */ /* Timeout for dead or inaccessible servers */
alarm(10); alarm(10);
signal(SIGALRM, socket_timeout); signal(SIGALRM, socket_timeout);
@ -53,9 +53,8 @@ static time_t askremotedate(const char *host)
close(fd); close(fd);
/* Convert from network byte order to local byte order. /* Convert from network byte order to local byte order.
* RFC 868 time is the number of seconds * RFC 868 time is seconds since 1900-01-01 00:00 GMT.
* since 00:00 (midnight) 1 January 1900 GMT * RFC 868 time 2,208,988,800 corresponds to 1970-01-01 00:00 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. * Subtract the RFC 868 time to get Linux epoch.
*/ */
nett = ntohl(nett) - RFC_868_BIAS; nett = ntohl(nett) - RFC_868_BIAS;
@ -66,7 +65,7 @@ static time_t askremotedate(const char *host)
* current time cur = 0x123ffffffff. * current time cur = 0x123ffffffff.
* Assuming our time is not some 40 years off, * Assuming our time is not some 40 years off,
* remote time must be 0x12400000001. * remote time must be 0x12400000001.
* Need to adjust out time by (int32_t)(nett - cur). * Need to adjust our time by (int32_t)(nett - cur).
*/ */
time_t cur = time(NULL); time_t cur = time(NULL);
int32_t adjust = (int32_t)(nett - (uint32_t)cur); int32_t adjust = (int32_t)(nett - (uint32_t)cur);