settimeofday(2)                   SDK R4.11                  settimeofday(2)


NAME
       settimeofday - set date and time

SYNOPSIS
       #include <sys/time.h>

       int    settimeofday (timevalue, timezone)
       struct timeval * timevalue;
       struct timezone * timezone;

   where:
       timevalue     Address of an initialized structure giving the new
                      current time

       timezone      NULL or address of an initialized structure giving the
                      new time zone

DESCRIPTION
       Settimeofday sets the system's notion of the current Greenwich time
       and the current time zone to the values contained in the structures
       at the locations specified by timevalue and timezone.

       When the time is successfully changed, a log of the change is sent to
       the error logger device.

       Two versions of settimeofday are provided, to accommodate the
       differences in the System V and BSD implementations.  The BSD version
       of settimeofday is selected unconditionally for 88K COFF-based
       software development environments (see sde(5)), and for other
       environments when BSD features are visible and either (1) the
       BSDTIMEOFDAYFLAVOR macro is defined, or (2) System V features are
       not visible.  The System V version is selected otherwise.  Note that
       DG/UX revisions prior to R4.10 provided only the BSD version.

       Both versions expect two arguments to be provided.  For the BSD
       version, both arguments are meaningful (as was true in all versions
       of DG/UX prior to R4.10).  For the System V version, the second
       argument is treated as NULL and should be coded as such.

       If timezone is NULL, the current time zone is not changed.

       The interpretation of the time value and time zone structures is
       discussed in gettimeofday(2).

       Although not enforced, it is unusual if the time zone correction,
       timezone.tzminuteswest, is not divisible by 60 minutes.

       Setting the system clock may interfere with other timing functions.

ACCESS CONTROL
       The calling process must have appropriate privilege to successfully
       execute this system call.  For systems supporting the DG/UX
       Capability Option, appropriate privilege is defined as having one or
       more specific capabilities enabled in the effective capability set of
       the calling process.  See capdefaults(5) for the default capability
       for this system call.

       On systems without the DG/UX Capability Option, appropriate privilege
       means that the process has an effective UID of root.  See the
       appropriateprivilege(5) man page for more information.

RETURN VALUE
       0      Completed successfully.

       -1     An error occurred.  errno is set to indicate the error.

DIAGNOSTICS
       Errno may be set to one of the following error codes:

       EFAULT    An argument address referenced invalid memory.

       EPERM     Permission to set the time is denied to the calling
                 process.

SEE ALSO
       date(1), gettimeofday(2), ctime(3C), sde(5),
       appropriateprivilege(5).
       capdefaults(5).


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