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Can anybody tell me how you would do this question ?
Write short C program for a UNIX/Linux operating system that will do the following:
Fork a child process
The parent process prints out its own pid and its child’s pid
The parent exits properly so as not to orphan its child
The child process sets its own priority to 2
The child process prints out its own pid, its parent’s pid and its own priority
The child process checks if it is an orphan before finishing; if it is an orphan it prints a message to say “I am an orphan”.
You do not need to put any error checks in your program. You do not need to list all of the C library include files, i.e. the .h files.
Since stack overflow is by NO means a write code for me please website the only "answer" we can offer you is a suggestion on where to look. With that in mind look up pthreads. Beyond that I don't expect people to give you anything due dates are your problem not ours.
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I have a program 'P' and P is executed in terminal A. Let's call it process A. While process A is running, terminal B is opened and executes P as process B.
How can I make process A find process B and exchange data with each other? Someone told me to implement it with MPI but I haven't found any material telling me how.
I also appreciate that if anyone can tell me how to make these two process read and write the same variable (same address in memory). This solves my problem, too.
There are lots of options, but in most cases I think you'll find that named pipes/fifo will meet your needs.
See mkfifo, which creates a named pipe on the filesystem; that pipe can then be opened and accessed using standard open/read/write like a file for interprocess communications.
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I would like to know if there is a way to launch an application through a c++ code? As if I was launching it through the command line (with giving parameters for example).
If it exists, please can you provide me with both the windows code as well as linux code (in case they differ).
You can use system calls, like:
exec()
fork()
You can find plenty of examples. I had also answered a question about fork() here.
For exec(), you could read this: Please explain exec() function and its family.
For Windows, you can use one of the spawn family of functions, like _wspawnl. For Linux, you can use one of the exec family of functions, in combination with fork, like execl.
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Init() is the initial or we can say a daemon process being called up on Bootup runs till shutdown if we won't kill it. So, this a Linux based definition. I have doubt whether the same definition is applicable in C++ environment.
Help Appreciated.
There is a process named init on many1—but not all—Linux systems. It is the very first process launched by the kernel and is the parent or ancestor of all processes. init has PID 1.
This process has nothing to do with any function you might create named init(), in the same way that a function named bash() has no relation to the shell /bin/bash. Do not conflate process names with function names. One has no connection to the other.
1 I say many Linux systems because init has been replaced by systemd in most modern Linux distros. It looks like init will eventually become a historical relic.
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Problem: Windows platform.
dll_1 in a process needs to know the thread id
of dll_2 in the same process.
dll_1 already has the hmodule of dll_2.
Although it may seem a trivial task there is no
documentation at all on how this can achieved.
You would think there would be a function such
as GetRemoteModuleThreadId() but if there is then it has been
concealed for security reasons.
A thread and a DLL are distinct and unrelated concepts. A DLL is just "some code that has been loaded into the process's memory" and a thread is a distinct sequence of code execution that happens to execute code, whether it's in the main exe or a DLL.
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I have seen lot of tutorials and documentation on how to get the files descriptors from a given pid. Well, I want to do otherwise.
Thanks.
Of course not, that's like trying to get the PID that called main. Every process has a file descriptor 0 (stdin), 1, 2, etc., and they mean different things for each process.
A file descriptor, which is just a small integer, isn't meaningful unless you already know what process you are talking about.