06-03-2009
Creating System Call, need PID of caller
Hey
I am creating a new system call that needs to know the PID of the calling process. I am new to coding in the kernel, so I don't know if this is possible... Any help would be nice.
Thanks!
Hapatchi
10 More Discussions You Might Find Interesting
1. UNIX for Advanced & Expert Users
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
2. UNIX for Dummies Questions & Answers
Hell Sir,
This is chanikya
Is there any System call which behaves just like fork but i dont want to return back two times to the calling func.
In the following ex iam creating a child process in the called func but the ex prints two times IN MAIN.
ex :-
calling()
{
fork();
}
... (2 Replies)
Discussion started by: chanikya
2 Replies
3. UNIX for Advanced & Expert Users
Hi
Reqmt: I am working on Sys 1 and passes a command to Sys2 using a utility which has ssh coded in it. Is there any way to get the process id of the command in Sys 2 from my Sys1 ? Note: The utility is not editable, so you cannot get it through it and I am not logged in in Sys2.
Thanks... (2 Replies)
Discussion started by: anu_math9
2 Replies
4. Shell Programming and Scripting
hello All,
I need to invoke by perl script some program/command and monitor it for 5
minutes . In case it still running for more then 5 min I need to send a signal which will stop it.
I implemeted this as shown below by using eval & alarm
and I'd like to know if there is a better way to... (1 Reply)
Discussion started by: Alalush
1 Replies
5. Shell Programming and Scripting
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
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:
clock_t times(struct tms *buf);
struct tms {... (2 Replies)
Discussion started by: Dedalus
2 Replies
7. Programming
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
8. Programming
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
9. Shell Programming and Scripting
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
10. Homework & Coursework Questions
Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
1. The problem statement, all variables and given/known data:
Here is what I am supposed to do, word for word from my assignment page:
1. Create/modify and print a... (2 Replies)
Discussion started by: Jagst3r21
2 Replies
LEARN ABOUT HPUX
pthread_get_nice_np
pthread_get_nice_np(3T) pthread_get_nice_np(3T)
NAME
pthread_get_nice_np(), pthread_set_nice_np() - get or set the nice value of a thread
SYNOPSIS
PARAMETERS
thread The thread whose nice value is to be set/retrieved.
nice_val Value of nice to be applied to the target thread is returned (get function) or it specifies the new value of nice for
thread (set function).
DESCRIPTION
These functions are used to set and retrieve the nice value of an individual thread.
returns the current nice value setting of the target thread and stores it in nice_val. adds the value of nice_val to the current nice
value of the target thread.
A thread's nice value is a non-negative number. The system imposes a minimum nice value of 0 and a maximum of 39 with lower nice values
providing more favorable scheduling. If calling results in a nice value outside the range of 0 to 39, the value will be set to the nearest
limit. A process must have appropriate privileges to lower a thread's nice value. The function allows individual threads in the process
to have different nice values.
returns the current nice value less 20 and will be in the range -20 to +19.
The nice value of only system scope threads can be changed. An attempt to change the nice value of a process-scope thread will result in a
return value of Calling on a thread that has a scheduling policy other than will have an effect only when the thread's scheduling policy
changes to If a thread calls the system call to create a new process, the new process inherits the process-level nice value. Calling to
create a new thread will result in the new thread inheriting the creating thread's nice value.
Note
If the nice value of the entire process is changed through or all the threads in the process will have their nice values reset to the new
process-level nice value. The new process's nice value setting overwrites the old thread's setting. Thus its possible that a thread whose
nice value had been set higher than the process-level nice value have its nice value lowered as a result of the process-level re-nicing.
RETURN VALUE
Upon successful completion, and return zero.
Otherwise, an error number is returned to indicate the error (the variable is not set).
ERRORS
If any of the following occur, the and functions return the corresponding error:
A process-scope thread was specified.
The caller does not have permission to lower the nice
value specified in nice_val.
No thread could be found corresponding to
thread.
AUTHOR
and were developed by HP.
SEE ALSO
fork(2), nice(2), setpriority(2), pthread_attr_getschedpolicy(3T), pthread_setschedparam(3T).
Pthread Library pthread_get_nice_np(3T)