#include <limits.h> #include <sys/time.h> #include <sys/timex.h> #include <errno.h> #define MAX_SEC (LONG_MAX / 1000000L - 2) #define MIN_SEC (LONG_MIN / 1000000L + 2) #ifndef MOD_OFFSET #define modes mode #endif int adjtime(const struct timeval * itv, struct timeval * otv) { struct timex tntx; if (itv) { struct timeval tmp; /* We will do some check here. */ tmp.tv_sec = itv->tv_sec + itv->tv_usec / 1000000L; tmp.tv_usec = itv->tv_usec % 1000000L; if (tmp.tv_sec > MAX_SEC || tmp.tv_sec < MIN_SEC) { __set_errno(EINVAL); return -1; } tntx.offset = tmp.tv_usec + tmp.tv_sec * 1000000L; tntx.modes = ADJ_OFFSET_SINGLESHOT; } else { tntx.modes = 0; } if (adjtimex(&tntx) < 0) return -1; if (otv) { if (tntx.offset < 0) { otv->tv_usec = -(-tntx.offset % 1000000); otv->tv_sec = -(-tntx.offset / 1000000); } else { otv->tv_usec = tntx.offset % 1000000; otv->tv_sec = tntx.offset / 1000000; } } return 0; }