gettimeofday man page on BSDi

Man page or keyword search:  
man Server   6284 pages
apropos Keyword Search (all sections)
Output format
BSDi logo
[printable version]

GETTIMEOFDAY(2)		    BSD Programmer's Manual	       GETTIMEOFDAY(2)

NAME
     gettimeofday, settimeofday - get/set date and time

SYNOPSIS
     #include <time.h>

     int
     gettimeofday(struct timeval *tp, struct timezone *tzp);

     int
     settimeofday(const struct timeval *tp, const struct timezone *tzp);

DESCRIPTION
     The timezone field is no longer used; timezone information is stored out-
     side the kernel.  See ctime(3) for more information.

     The system's notion of the current Greenwich time and the current time
     zone is obtained with the gettimeofday() call, and set with the
     settimeofday() 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 tp or tzp is NULL, the associated time information will
     not be returned or set.

     The structures pointed to by tp and tzp are defined in <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.	If the system
     is running in secure mode (see init(8)),  the time may only be advanced.
     This limitation is imposed to prevent a malicious super-user from setting
     arbitrary time stamps on files.  The system time can still be adjusted
     backwards using the adjtime(2) system call even when the system is se-
     cure.

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 in-
     to 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)

HISTORY
     The gettimeofday function call appeared in 4.2BSD.

4th Berkeley Distribution	 May 26, 1995				     2
[top]

List of man pages available for BSDi

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
....................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net