gettimeofday (original) (raw)

The Open Group Base Specifications Issue 6
IEEE Std 1003.1, 2004 Edition
Copyright © 2001-2004 The IEEE and The Open Group, All Rights reserved.

A newer edition of this document exists here

NAME

gettimeofday - get the date and time

SYNOPSIS

`[XSI] #include <sys/time.h>

int gettimeofday(struct timeval *restrict

tp, void *restrict tzp); `

DESCRIPTION

The gettimeofday() function shall obtain the current time, expressed as seconds and microseconds since the Epoch, and store it in the timeval structure pointed to by tp. The resolution of the system clock is unspecified.

If tzp is not a null pointer, the behavior is unspecified.

RETURN VALUE

The gettimeofday() function shall return 0 and no value shall be reserved to indicate an error.

ERRORS

No errors are defined.

The following sections are informative.

EXAMPLES

None.

APPLICATION USAGE

None.

RATIONALE

None.

FUTURE DIRECTIONS

None.

SEE ALSO

ctime(), ftime(), the Base Definitions volume of IEEE Std 1003.1-2001, <sys/time.h>

CHANGE HISTORY

First released in Issue 4, Version 2.

Issue 5

Moved from X/OPEN UNIX extension to BASE.

Issue 6

The DESCRIPTION is updated to refer to "seconds since the Epoch" rather than "seconds since 00:00:00 UTC (Coordinated Universal Time), January 1 1970" for consistency with other time functions.

The restrict keyword is added to the gettimeofday() prototype for alignment with the ISO/IEC 9899:1999 standard.

End of informative text.

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