Originální popis anglicky:
sys/time.h - time types
Návod, kniha: POSIX Programmer's Manual
#include <sys/time.h>
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.
None.
None.
None.
<sys/select.h> ,
<sys/types.h> , the System Interfaces
volume of IEEE Std 1003.1-2001,
getitimer(),
gettimeofday(),
select(),
setitimer()
Portions of this text are reprinted and reproduced in electronic form from IEEE
Std 1003.1, 2003 Edition, Standard for Information Technology -- Portable
Operating System Interface (POSIX), The Open Group Base Specifications Issue
6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics
Engineers, Inc and The Open Group. In the event of any discrepancy between
this version and the original IEEE and The Open Group Standard, the original
IEEE and The Open Group Standard is the referee document. The original
Standard can be obtained online at http://www.opengroup.org/unix/online.html
.
