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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 .