Unixy question
Unixy question
- Subject: Unixy question
- From: Paul Skinner <email@hidden>
- Date: Thu, 9 May 2002 01:08:56 -0400
Can someone translate this into the actual string I need to give to a
'do shell script' command to get the time with microseconds ?
I still feel like I'm reading a french textbook. I know all of these
words, but I can't seem to arrange them into meaningful sentences.
GETTIMEOFDAY(2) System Calls Manual
GETTIMEOFDAY(2)
NAME
gettimeofday, settimeofday - get/set date and time
SYNOPSIS
#include <sys/time.h>
int
gettimeofday(struct timeval *tp, struct timezone *tzp);
int
settimeofday(const struct timeval *tp, const struct timezone *tzp);
DESCRIPTION
Note: timezone is no longer used; this information is kept outside
the
kernel.
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 <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. If the
system
securelevel is greater than 1 (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 sys-
tem is secure.
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)
HISTORY
The gettimeofday() function call appeared in 4.2BSD.
4th Berkeley Distribution May 26, 1995 4th Berkeley
Distribution
--
Paul Skinner
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