trusty (7) sys_time.h.7posix.gz

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 .