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NAMEtv - high resolution time support SYNOPSIS#include <tv.h> DESCRIPTIONThe tv library supports high resolution Tv_t time specifications. Tv_t contains these elements:
In practice resolution is much coarser than 1 nanosecond. Systems that only support 1 second resolution always set tv_nsec to 0. int tvgettime(Tv_t* tv)Sets tv to the current time. 0 is returned on success, -1 on error. int tvsettime(const Tv_t* tv)Sets the system time to tv. The caller must have sufficient privilege. 0 is returned on success, -1 on error. int tvcmp(const Tv_t* av, const Tv_t* bv)Compares the times av and bv and returns -1 if av is less than bv, 0 if av is equal to bv, and 1 if av is greater than bv. time_t tvgetctime(Tv_t* tv, const struct stat* st)These macros set tv to the st the access, modify, or change time, respectively. The seconds portion of tv is returned. time_t tvsetctime(Tv_t* tv, struct stat* st)These macros set the st access, modify, or change time, respectively, to tv. The seconds portion of tv is returned. int tvtouch(const char* path, const Tv_t* av, const Tv_t* mv, const Tv_t* cv, int copy)Sets the file path access time from av, modify time from mv, and change time from cv. Any of av, mv, and cv may be 0; the corresponding file time will retain the previous value if path exists and copy is 1; otherwise the corresponding file time will be set to the current time. 0 is returned on success, -1 on error. int tvsleep(const Tv_t* tv, Tv_t* rv)Pauses execution for tv time. 0 is returned if the full tv amount has expired. Otherwise -1 is returned and rv, if not 0, is set to the sleep time remaining. RETURN VALUEExcept for tvcmp(), an error return of -1 also sets errno to the corresponding error code. SEE ALSOtm(3)
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