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gettimeofday(2) [hpux man page]

gettimeofday(2) 						System Calls Manual						   gettimeofday(2)

NAME
gettimeofday - get the date and time SYNOPSIS
DESCRIPTION
The function obtains the current time, expressed as seconds and microseconds since Epoch, and stores it in the structure pointed to by tp. The resolution of the system clock is one microsecond. PARAMETERS
Programs should use this time zone information only in the absence of the environment variable. tp A pointer to a structure in which the current time is returned. The structure includes the following members: tzp If this parameter is not a null pointer, it is interpreted as a pointer to a structure under HP-UX. The structure has the following fields: tz_minuteswest The number of minutes that the local time zone is west of Coordinated Universal Time (UTC) or Epoch. tz_dsttime A flag that, if nonzero, indicates that Daylight Savings Time (DST) applies locally during the appropriate part of the year. RETURN VALUE
returns the following values under HP-UX: Successful completion. Failure. is set to indicate the error. ERRORS
If fails, is set to the following value under HP-UX: [EFAULT] An argument address referenced invalid memory. EXAMPLES
The following HP-UX example calls twice. It then computes the lapsed time between the calls in seconds and microseconds and stores the result in a timeval structure: WARNINGS
Relying on a granularity of one microsecond may result in code that is not portable to other platforms. AUTHOR
was developed by the University of California, Berkeley, and HP. SEE ALSO
date(1), ftime(2), settimeofda(2), stime(2), time(2), ctime(3C). gettimeofday(2)

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GETTIMEOFDAY(2) 						System Calls Manual						   GETTIMEOFDAY(2)

NAME
gettimeofday, settimeofday - get/set date and time SYNOPSIS
#include <sys/time.h> gettimeofday(tp, tzp) struct timeval *tp; struct timezone *tzp; settimeofday(tp, tzp) struct timeval *tp; struct timezone *tzp; DESCRIPTION
The system's notion of the current Greenwich time and the current time zone is obtained with the gettimeofday call, and set with the set- timeofday call. The time is expressed in seconds and microseconds since midnight (0 hour), January 1, 1970. The resolution of the system clock is hardware dependent, and the time may be updated continuously or in ``ticks.'' If tzp is zero, the time zone information will not be returned or set. The structures pointed to by tp and tzp are defined in <sys/time.h> as: struct timeval { long tv_sec; /* seconds since Jan. 1, 1970 */ long tv_usec; /* and microseconds */ }; struct timezone { int tz_minuteswest; /* of Greenwich */ int tz_dsttime; /* type of dst correction to apply */ }; The timezone structure indicates the local time zone (measured in minutes of time westward from Greenwich), and a flag that, if nonzero, indicates that Daylight Saving time applies locally during the appropriate part of the year. Only the super-user may set the time of day or time zone. RETURN
A 0 return value indicates that the call succeeded. A -1 return value indicates an error occurred, and in this case an error code is stored into the global variable errno. ERRORS
The following error codes may be set in errno: [EFAULT] An argument address referenced invalid memory. [EPERM] A user other than the super-user attempted to set the time. SEE ALSO
date(1), adjtime(2), ctime(3), timed(8) 4th Berkeley Distribution May 14, 1986 GETTIMEOFDAY(2)
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