The
adjtime() function gradually adjusts the system clock (as returned by
gettimeofday()). The amount of time by which the clock is to be adjusted is specified
in the structure pointed to by
delta. This structure has the following form:
struct timeval {
time_t tv_sec; /* seconds */
suseconds_t tv_usec; /* microseconds */
};
If the adjustment in
delta is positive, then the system clock is speeded up by some
small percentage (i.e., by adding a small
amount of time to the clock value in each second) until the adjustment
has been completed.
If the adjustment in
delta is negative, then the clock is slowed down in a similar fashion.
If a clock adjustment from an earlier
adjtime() call is already in progress
at the time of a later
adjtime() call, and
delta is not NULL for the later call, then the earlier adjustment is stopped,
but any already completed part of that adjustment is not undone.
If
olddelta is not NULL, then the buffer that it points to is used to return
the amount of time remaining from any previous adjustment that
has not yet been completed.
