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Top Forums Programming How to get uptime in miliseconds ? Post 302579338 by methyl on Monday 5th of December 2011 12:48:30 PM
Old 12-05-2011
MySQL

Please post exactly which Operating System and version you have and what programming language or Shell you are using for you "application".

In many unix systems the first entry in the file /etc/utmp (/etc/utmpx in Solaris) is the "system boot" time in seconds since the epoch. See "man utmp". It is the same file which is read by the unix commands "uptime" and "who -b" (to name but a few).

gettimeofday(2) has more precision than time(2) .
 

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GETUTMP(3)						     Linux Programmer's Manual							GETUTMP(3)

NAME
getutmp, getutmpx - copy utmp structure to utmpx, and vice versa SYNOPSIS
#define _GNU_SOURCE /* See feature_test_macros(7) */ #include <utmpx.h> void getutmp(const struct utmpx *ux, struct utmp *u); void getutmpx(const struct utmp *u, struct utmpx *ux); DESCRIPTION
The getutmp() function copies the fields of the utmpx structure pointed to by ux to the corresponding fields of the utmp structure pointed to by u. The getutmpx() function performs the converse operation. RETURN VALUE
These functions do not return a value. VERSIONS
These functions first appeared in glibc in version 2.1.1. ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7). +----------------------+---------------+---------+ |Interface | Attribute | Value | +----------------------+---------------+---------+ |getutmp(), getutmpx() | Thread safety | MT-Safe | +----------------------+---------------+---------+ CONFORMING TO
These functions are nonstandard, but appear on a few other systems, such as Solaris and NetBSD. NOTES
These functions exist primarily for compatibility with other systems where the utmp and utmpx structures contain different fields, or the size of corresponding fields differs. On Linux, the two structures contain the same fields, and the fields have the same sizes. SEE ALSO
utmpdump(1), getutent(3), utmp(5) COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. Linux 2015-03-02 GETUTMP(3)
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