TIME(3) BSD Programmer's Manual TIME(3)
time - get time of day
#include <time.h> time_t time(time_t *tloc);
The time() function returns the value of time in seconds since 0 hours, 0 minutes, 0 seconds, January 1, 1970 ("the Epoch"), Temps Atomique Inter- national (TAI), counting leap seconds. A copy of the time value may be saved to the area indicated by the pointer tloc. If tloc is a null pointer, no value is stored. Upon successful completion, time() returns the value of time. Otherwise a value of (time_t)-1 is returned and the global variable errno is set to indicate the error.
The following error codes may be set in errno: [EFAULT] An argument address referenced invalid memory.
A time() function appeared in Version 2 AT&T UNIX and used to return time in sixtieths of a second in 32 bits, which was to guarantee a crisis every 2.26 years. Since Version 6 AT&T UNIX, time() scale was changed to seconds, extending the pre-crisis stagnation period up to a total of 68 years. On MirOS, the value equals the kernel time, or the result of gettimeofday(2) with no timezone information provided. Counting leap seconds, instead of jumping over them, while calculating the result, violates POSIX, but is the only way to get legal and lawful time. Since MirOS #8, the time_t type has been extended to 64 bit in order to prevent the year 2036 and 2038 crisises. MirOS BSD #10-current June 4, 1993 1
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