<sys/time.h> (original) (raw)

The <sys/time.h> header shall define the timeval structure that includes at least the following members:

time_t tv_sec Seconds. suseconds_t tv_usec Microseconds.

The <sys/time.h> header shall define the itimerval structure that includes at least the following members:

struct timeval it_interval Timer interval. struct timeval it_value Current value.

The time_t and suseconds_t types shall be defined as described in <sys/types.h>.

The fd_set type shall be defined as described in <sys/select.h>.

The <sys/time.h> header shall define the following values for the which argument of getitimer() and setitimer():

ITIMER_REAL

Decrements in real time.

ITIMER_VIRTUAL

Decrements in process virtual time.

ITIMER_PROF

Decrements both in process virtual time and when the system is running on behalf of the process.

The following shall be defined as described in <sys/select.h> : FD_CLR() FD_ISSET() FD_SET() FD_ZERO() FD_SETSIZE

The following shall be declared as functions and may also be defined as macros. Function prototypes shall be provided.

int getitimer(int, struct itimerval *); int gettimeofday(struct timeval *restrict, void *restrict); int select(int, fd_set *restrict, fd_set *restrict, fd_set *restrict, struct timeval *restrict); int setitimer(int, const struct itimerval *restrict, struct itimerval *restrict); int utimes(const char *, const struct timeval [2]); (LEGACY )

Inclusion of the <sys/time.h> header may make visible all symbols from the <sys/select.h> header.

The following sections are informative.

End of informative text.