time: získejte čas v sekundách

Originální popis anglicky: time - get time in seconds

Návod, kniha: Linux Programmer's Manual

STRUČNĚ

#include <time.h> time_t time(time_t *t);

POPIS / INSTRUKCE

time returns the time since the Epoch (00:00:00 UTC, January 1, 1970), measured in seconds. If t is non-NULL, the return value is also stored in the memory pointed to by t.

NÁVRATOVÁ HODNOTA

On success, the value of time in seconds since the Epoch is returned. On error, ((time_t)-1) is returned, and errno is set appropriately.

CHYBY / ERRORY

EFAULT

t points outside your accessible address space.

NOTES

POSIX.1 defines seconds since the Epoch as a value to be interpreted as the number of seconds between a specified time and the Epoch, according to a formula for conversion from UTC equivalent to conversion on the naïve basis that leap seconds are ignored and all years divisible by 4 are leap years. This value is not the same as the actual number of seconds between the time and the Epoch, because of leap seconds and because clocks are not required to be synchronised to a standard reference. The intention is that the interpretation of seconds since the Epoch values be consistent; see POSIX.1 Annex B 2.2.2 for further rationale.

ODPOVÍDAJÍCÍ

SVr4, SVID, POSIX, X/OPEN, BSD 4.3 Under BSD 4.3, this call is obsoleted by gettimeofday(2). POSIX does not specify any error conditions.

SOUVISEJÍCÍ

date(1), gettimeofday(2), ctime(3), ftime(3)