Problem with implementing the times() function in C (struct tms times return zero/negative values)
Hello,
i'm trying to implement the times() function and i'm programming in C.
I'm using the "struct tms" structure which consists of the fields:
The tms_utime structure member is the CPU time charged for the execution of user instructions of the calling process.
The tms_stime structure member is the CPU time charged for execution by the system on behalf of the calling process.
The tms_cutime structure member is the sum of the tms_utime and tms_cutime times of the child processes.
The tms_cstime structure member is the sum of the tms_stime and tms_cstime times of the child processes.
In order to implement the times() function in my program, i do:
1. Before i fork and create a child, i call the times function (in the parent process). 2. I create a pipe and i pass the times of start structure to the pipe when i'm in the child process. 3. The child executes a simple "ls -l" command 4. When the child finishes he execution, the father calls for the second time the times() function.
Unfortunately, the times of end_tms are all zero!! Weird, but i don't know why...
Some things i don't understand in my program are:
1)In the first "printfs" the times of the struct start are negative..but why?? 2) Also, when i run the program, i get zeros for times, but why??What am i doing wrong??
Hi,
I have a small part of a project which is done as a bash script. bash was selected as an portability issue that works out of the box. In this script I have an exec shell-function, a wrapper around arbitrary commands. I want to have STDOUT, as an addon STDERR and the EXIT-CODE of a specified... (5 Replies)
Hi
I am pretty confused in returning and capturing multiple values
i have defined a function which should return values "total, difference"
i have used as
#!/usr/bin/ksh
calc()
{
total=$1+$2
echo "$total"
diff=$2-$1
echo "$diff"
}
I have invoked this function as
calc 5 8
Now i... (2 Replies)
We have a program source C and is required to indicate how many times each function is called from the C program. also print the line number where there is a call.
I've tried something like this:
#!/bin/sh
for i in $*;do
if !
then
echo $i is not a C file.
else echo $i... (0 Replies)
I have this code where I have declared a struct with some functions. Trying to write the function implementation outside the struct declaration and do not know how to proceed.
#ifndef ParseEl_hh
#define ParseEl_hh
#include <iostream>
#include <fstream>
#include "DynBaseObj.hh"... (7 Replies)
Ok, so i monitor disk space on remote machines using snmp. Works great for me. But whenever a particular partition happens to have Terabytes of data, snmp starts reporting negative values.
Can someone please tell me how to get around this problem?
The AllocationUnit is 512 bytes. Weird... (0 Replies)
Hi
I am new to the forum and would like to ask:
i have a file in form with thousands of column
id.1 A01 A01 A68 A68
id.2 A5 A5 A3 A3
1001 0 0 0.136 0.136
1002 0 0 0.262 0.183
1003 0 0 0.662 0.662
1004 0 0 ... (9 Replies)
iam trying to built a firewall.so i have used netfilter for it.
in function main_hook sock_buff is returning null and in my log file continuously "sock buff null" is printed plse help to solve this problem..
(using print_string iam printing strings on current terminal (terminal we ping))
... (1 Reply)
Okay, not sure if it can be done, I would think it could be done and I'm just having a hard time with it.
fun_close_wait(){
ipVar="${1} ${2}"
portVar=`cat "${5}" | cut -d' ' -f 1`
for ip in $ipVar
do
for port in $portVar
do
netstatVar=`netstat -n | grep... (4 Replies)
i need to output an ls command to a file but also capture any errors from that command and output them to a log file and the screen.
if it's only possible to output them to a log file and not the screen then that's fine.
this is what i've tried so far, but it won't populate log.txt. i've... (16 Replies)