типы времени (time types)
Пролог (Prolog)
This manual page is part of the POSIX Programmer's Manual. The
Linux implementation of this interface may differ (consult the
corresponding Linux manual page for details of Linux behavior),
or the interface may not be implemented on Linux.
Имя (Name)
sys/time.h — time types
Синопсис (Synopsis)
#include <sys/time.h>
Описание (Description)
The <sys/time.h> header shall define the timeval structure, which
shall include 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,
which shall include at least the following members:
struct timeval it_interval Timer interval.
struct timeval it_value Current value.
The <sys/time.h> header shall define the time_t and suseconds_t
types as described in <sys/types.h>.
The <sys/time.h> header shall define the fd_set type as described
in <sys/select.h>.
The <sys/time.h> header shall define the following symbolic
constants 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 <sys/time.h> header shall define the following 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 setitimer(int, const struct itimerval *restrict,
struct itimerval *restrict);
int select(int, fd_set *restrict, fd_set *restrict, fd_set *restrict,
struct timeval *restrict);
int utimes(const char *, const struct timeval [2]);
Inclusion of the <sys/time.h> header may make visible all symbols
from the <sys/select.h> header.
The following sections are informative.
Использование в приложениях (Application usage)
None.
Обоснование (Rationale)
None.
Будущие направления (Future directions)
None.
Смотри также (See also)
sys_select.h(0p), sys_types.h(0p)
The System Interfaces volume of POSIX.1‐2017, futimens(3p),
getitimer(3p), gettimeofday(3p), pselect(3p)
