Sponsored Content
Full Discussion: the problem of gettimeofday
Top Forums Programming the problem of gettimeofday Post 302220388 by jim mcnamara on Thursday 31st of July 2008 03:09:07 PM
Old 07-31-2008
First off, try man timercmp. If you are on older systems it may not exist.
Otherwise -- Look for something like this in your sys/time.h file
Code:
#  define timerisset(tvp)               ((tvp)->tv_sec || (tvp)->tv_usec)
#  define timercmp(tvp, uvp, cmp) \
          ((tvp)->tv_sec cmp (uvp)->tv_sec || \
           (tvp)->tv_sec == (uvp)->tv_sec && (tvp)->tv_usec cmp (uvp)->tv_usec)
#  define timerclear(tvp)               ((tvp)->tv_sec = (tvp)->tv_usec = 0L)
#  define is_valid_timeval(tvp) \
          ((tvp)->tv_usec >= 0L && (tvp)->tv_usec < 1000000L)

Note - these are from an HPUX 11.23 implementation - use the ones written for your system....


These macros are defined to work with timeval structs and perform arithmetic operations on them.
 

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

SSH Problem auth problem

Hi, Just recently we seem to be getting the following error message relating to SSH when we run the UNIX script in background mode: warning: You have no controlling tty. Cannot read confirmation.^M warning: Authentication failed.^M Disconnected; key exchange or algorithm negotiation... (1 Reply)
Discussion started by: budrito
1 Replies

2. Shell Programming and Scripting

problem with dd command or maybe AFS problem

Hi, folks. Sorry for bothering, but maybe someone could help me please. The problem is the following: there is some script that copies files from local file system to AFS. The copying is performed with dd command. The script copies data into some AFS volumes. The problem appeared with one... (0 Replies)
Discussion started by: Anta
0 Replies

3. Solaris

problem in finding a hardware problem

Hi I am right now facing a strange hardware problem. System get booted with the following error: Fatal Error Reset CPU 0000.0000.0000.0003 AFSR 0100.0000.0000.0000 SCE AFAR 0000.07c6.0000.1000 SC Alert: Host System has Reset It happen 4 or 5 times and get the same error every time.I... (8 Replies)
Discussion started by: girish.batra
8 Replies

4. Programming

Gettimeofday problem

i have written the code in which i want to calculate timedifference of request sent time and response receive time from device in second and microsecond. but when i executes the binary i get the response receive time earlier than request sent time which in turn returns the negative time difference.... (3 Replies)
Discussion started by: kailas.awchar
3 Replies

5. AIX

user login problem & Files listing problem.

1) when user login to the server the session got colosed. How will resolve? 2) While firing the command ls -l we are not able to see the any files in the director. but over all view the file system using the command df -g it is showing 91% used. what will be the problem? Thanks in advance. (1 Reply)
Discussion started by: pernasivam
1 Replies

6. Programming

smallest resolution using gettimeofday() in C

Hello ... Can somebody help telling me how smallest clock resolution on ones sytem can be in obtained in C using gettimeofday() . Thankz in advance... (4 Replies)
Discussion started by: harsha10
4 Replies

7. UNIX for Dummies Questions & Answers

DHCP problem and eth1 problem

At work I am trying to get this one Linux machine (let's call it ctesgm07) to behave like another Linux machine that we have (let's call it test007). test007 returns the following version info: cat /etc/debian_version: lenny/sid uname -a: Linux test007 2.6.27-7-generic #1 SMP Tue Nov 4... (0 Replies)
Discussion started by: sllinux
0 Replies

8. IP Networking

Problem with forwarding emails (SPF problem)

Hi, This is rather a question from a "user" than from a sys admin, but I think this forum is apropriate for the question. I have an adress with automatic email forwarding and for some senders (two hietherto), emails are bouncing. This has really created a lot of problems those two time so I... (0 Replies)
Discussion started by: carwe
0 Replies

9. UNIX for Dummies Questions & Answers

sed Or Grep Problem OR Terminal Problem?

I don't know if you guys get this problem sometimes at Terminal but I had been having this problem since yesterday :( Maybe I overdid the Terminal. Even the codes that used to work doesn't work anymore. Here is what 's happening: * I wanted to remove lines containing digits so I used this... (25 Replies)
Discussion started by: Nexeu
25 Replies

10. IP Networking

Router problem or ISP problem ?

Hi everyone, I am experiencing discontinuity of Internet service, this started 1 month ago. Everything worked very well for 1 year of intensive use, but now, I have problems reaching my gateway. The gateway is not my router but a node belonging to my ISP and I share the same public IP with... (3 Replies)
Discussion started by: remic
3 Replies
TIMERADD(3)						   BSD Library Functions Manual 					       TIMERADD(3)

NAME
timeradd, timersub, timerclear, timerisset, timercmp -- operations on timevals SYNOPSIS
#include <sys/time.h> void timeradd(struct timeval *a, struct timeval *b, struct timeval *res); void timersub(struct timeval *a, struct timeval *b, struct timeval *res); void timerclear(struct timeval *tvp); int timerisset(struct timeval *tvp); int timercmp(struct timeval *a, struct timeval *b, CMP); DESCRIPTION
These macros are provided for manipulating timeval structures for use with the gettimeofday(2) and settimeofday(2) calls. The structure is defined in <sys/time.h> as: struct timeval { long tv_sec; /* seconds since Jan. 1, 1970 */ long tv_usec; /* and microseconds */ }; timeradd() adds the time information stored in a to b and stores the resulting timeval in res. The results are simplified such that the value of res->tv_usec is always less than 1,000,000 (1 second). timersub() subtracts the time information stored in b from a and stores the resulting timeval in res. timerclear() initializes tvp to midnight (0 hour) January 1st, 1970 (the Epoch). timerisset() returns true if tvp is set to any time value other than the Epoch. timercmp() compares a to b using the comparison operator given in CMP, and returns the result of that comparison. SEE ALSO
gettimeofday(2) HISTORY
The timeradd() family of macros were imported from NetBSD 1.1, and appeared in FreeBSD 2.2.6. BSD
August 11, 1999 BSD
All times are GMT -4. The time now is 11:34 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy