Sponsored Content
Full Discussion: C:system call
Top Forums Programming C:system call Post 302327667 by Dedalus on Monday 22nd of June 2009 09:40:14 AM
Old 06-22-2009
C:system call

Hi

I'm studing the system call. I've written a small program that return the time spent in doing some operations. Now I'd like to write one that return the time spent in user mode of a process.
I'm reading that i should use the tms struct:

Code:
clock_t times(struct tms *buf);

 struct tms {
               clock_t tms_utime;  /* user time */
               clock_t tms_stime;  /* system time */
               clock_t tms_cutime; /* user time of children */
               clock_t tms_cstime; /* system time of children */
           };

But It's not very clear pratically. Surfing on the net I've found just hard examples.

Can anyone help with a small example that show how can i use the times function?


Thanks in advance


D.
 

10 More Discussions You Might Find Interesting

1. Programming

semclt system call ???

hi mates, What is the : semctl system call for? any example will be helpful and be appreciated. cya and thanx abdul (2 Replies)
Discussion started by: abdul
2 Replies

2. Programming

Problem in system call

Dear Friends, I write a c program to list the directories recursively. For this I write a function called my_readdir to read the content of directory. For this I use read system call it returns -1, then I use readdir system call it gives comment terminated error or segmentation... (1 Reply)
Discussion started by: spmlingam
1 Replies

3. UNIX for Advanced & Expert Users

how to differentiate system call from library call

Hi, Ho do I differentiate system call from library call? for example if I am using chmod , how do I find out if it is a system call or library call? Thanks Muru (2 Replies)
Discussion started by: muru
2 Replies

4. Programming

c system call

How the c compiler differentiates the system calls and function calls? (1 Reply)
Discussion started by: rangaswamy
1 Replies

5. Shell Programming and Scripting

system call

Hi, How to write a system calls in a script ? > cd $HOME > ls -ltr thanks in advance.. (10 Replies)
Discussion started by: hegdeshashi
10 Replies

6. Programming

system call

I have a cgi script which is called after certain time interval, which has this: system ("ls -l /tmp/cgic* | grep -v \"cgicsave.env\" | awk '{print $5}'"); During the execution of this script,the output is 0 sometimes. But due to this the system call is not working at all and doesnt o/p... (2 Replies)
Discussion started by: xs2punit
2 Replies

7. Programming

need help with system call

hi everyone i wrote a system call and compiled the kernel succesfully... my system call is in a file in the kernel folder named my_syscall1.c (kernel/my_syscall1.c) the header file for this system call i added it in the folder include like this include/my_syscall1/my_syscall1.h my problem is... (2 Replies)
Discussion started by: demis87
2 Replies

8. Shell Programming and Scripting

system call

Trying to figure out a load issue with a webserver. I have traced a php script and noticed the following connect(4, {sa_family=AF_INET, sin_port=htons(3306), sin_addr=inet_addr("XX.XX.XX.XX")}, 16) = -1 EINPROGRESS (Operation now in progress) <0.000035> poll(, 1, 2000) = 1 () <0.000120>... (5 Replies)
Discussion started by: rajan007
5 Replies

9. Programming

[C] exec system call

Hi again ;) Now I want to make a program that will execute the programs with exec, asking the user if he wants the program to run in background or foreground. scanf("%c",&caracter); if (caracter=='y'){ printf("Has decidido ejecutarlo en background\n"); if((pid=fork())==0) {// fork para... (3 Replies)
Discussion started by: lamachejo
3 Replies

10. Programming

c programming system call

newPerm = oldPerm & ~0100; where oldPerm holds the value of st_mode from the system call stat(). When I try and compile every line where ive attempted to do these operations gives the warning "parameter names without declaration types in function declaration". what could be the problem? the... (2 Replies)
Discussion started by: bjhum33
2 Replies
TIMES(2)							System Calls Manual							  TIMES(2)

NAME
times - get process times SYNOPSIS
#include <sys/types.h> #include <sys/times.h> #include <time.h> int times(struct tms *buffer) DESCRIPTION
Times returns time-accounting information for the current process and for the terminated child processes of the current process. All times are in 1/CLOCKS_PER_SEC seconds. This is the structure returned by times: struct tms { clock_t tms_utime; /* user time for this process */ clock_t tms_stime; /* system time for this process */ clock_t tms_cutime; /* children's user time */ clock_t tms_cstime; /* children's system time */ }; The user time is the number of clock ticks used by a process on its own computations. The system time is the number of clock ticks spent inside the kernel on behalf of a process. This does not include time spent waiting for I/O to happen, only actual CPU instruction times. The children times are the sum of the children's process times and their children's times. RETURN
Times returns 0 on success, otherwise -1 with the error code stored into the global variable errno. ERRORS
The following error code may be set in errno: [EFAULT] The address specified by the buffer parameter is not in a valid part of the process address space. SEE ALSO
time(1), wait(2), time(2). 4th Berkeley Distribution May 9, 1985 TIMES(2)
All times are GMT -4. The time now is 04:02 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy