09-15-2006
time difference
Hi,
i have one hard coded time which will be 23:45 and one will be sysdate (same date) and time less than 23:45.
i want to start my job at 23:45 and the input file will be arriving before that. so i want to make sure that the task starts only at 23:45 and from the input file time till 23:45 the script should go into sleep mode.
for that i need difference between both the times in seconds so that i can use sleep for the difference time.
Please help me on how to get the difference in seconds.
Any other solution to achieve the same requirement is also welcomed.
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SLEEP(3) Linux Programmer's Manual SLEEP(3)
NAME
sleep - sleep for the specified number of seconds
SYNOPSIS
#include <unistd.h>
unsigned int sleep(unsigned int seconds);
DESCRIPTION
sleep() makes the calling thread sleep until seconds seconds have elapsed or a signal arrives which is not ignored.
RETURN VALUE
Zero if the requested time has elapsed, or the number of seconds left to sleep, if the call was interrupted by a signal handler.
CONFORMING TO
POSIX.1-2001.
BUGS
sleep() may be implemented using SIGALRM; mixing calls to alarm(2) and sleep() is a bad idea.
Using longjmp(3) from a signal handler or modifying the handling of SIGALRM while sleeping will cause undefined results.
SEE ALSO
alarm(2), nanosleep(2), signal(2), signal(7)
COLOPHON
This page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
GNU
2010-02-03 SLEEP(3)