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<sys/time.h>(P) POSIX Programmer's Manual <sys/time.h>(P)
NAME
sys/time.h - time types
SYNOPSIS
#include <sys/time.h>
DESCRIPTION
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.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
SEE ALSO
<sys/select.h> , <sys/types.h> , the System Interfaces volume of
IEEE Std 1003.1-2001, getitimer(), gettimeofday(), select(),
setitimer()
COPYRIGHT
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 .
IEEE/The Open Group 2003 <sys/time.h>(P)
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This page was generated on Sat Sep 8 16:41:16 GMT 2007
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