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In C Program, determine if job is running

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# 8  
Old 06-30-2006
All I'm saying is that ps on some systems invokes kernel mode code. I agree that spawning a process for this from C is a bad idea, but until the OP learns internals and systems calls he cannot get away from ps..
# 9  
Old 07-03-2006
Quote:
Originally Posted by jim mcnamara
All I'm saying is that ps on some systems invokes kernel mode code. I agree that spawning a process for this from C is a bad idea, but until the OP learns internals and systems calls he cannot get away from ps..

get the processid, and send signal-0 to that processid
if return value is equal to 0, process is available else its not available,

here there is no need to spawn a process with system call,

isn't this better ???
# 10  
Old 07-03-2006
Quote:
Originally Posted by Hitori
I dont think that executing the shall command "ps -ef | grep 'job_name' | grep -v grep" is the best idia to solve this task. There are must be appropriate solution in C. (I've used Linux in general and prefer to use /proc)
else,
if you dont accept what Jim said,

i believe you should read the kernal internal data structure- process table as such ... which is done by ps.

And the code should itself switch to kernal mode to become permissible to read the process table and its entries
# 11  
Old 07-03-2006
Quote:
Originally Posted by matrixmadhan
else,
i believe you should read the kernal internal data structure- process table as such ... which is done by ps.
not all ps implementations do so Smilie

Quote:
Originally Posted by matrixmadhan
And the code should itself switch to kernal mode to become permissible to read the process table and its entries
Thanks, I'll try
# 12  
Old 07-03-2006
Quote:
not all ps implementations do so
i didnt mean it that way...

my intention was just to say.. read the kernel data structure - process table and its entries

the usage ps is just an example and not a standard
# 13  
Old 07-16-2006
the unix programming faq contains sample programms for that. on linux it can be done by
searching /proc
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