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Process size on UNIX


By : mikko
Date : July 26 2020, 02:00 PM
wish help you to fix your issue The exact definitions of vsize, rss, rprvt, rshrd, and other obscure-looking abbreviations vary from OS to OS. The manual pages for the top and ps commands will have some sort of description, but all such descriptions are simplified greatly (or are based on long-extinct kernel implementations).
"Process size" as a concept is fiendishly difficult to pin down in the general case. Answers in specific instances depend heavily on the actual memory management implementation in the OS, and are rarely as satisfying as the tidy "process size" concept that exists in the minds of most users (and most developers).
code :


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UNIX: What should be Stack Size (ulimit -s) in UNIX?


By : Đỗ Hiếu
Date : March 29 2020, 07:55 AM
Does that help Most people rely on the stack being “large” and their programs not using all of it, simply because the size has been set so large that programs rarely fail because they run out of stack space unless they use very large arrays with automatic storage duration.
This is an engineering failure, in the sense that it is not engineering: A known and largely preventable source of complete failure is uncontrolled.

Unix/Linux pipe behavior when reading process terminates before writing process


By : Battista
Date : March 29 2020, 07:55 AM
like below fixes the issue If the read end of some pipe(2) is close(2)-ed, further write(2)s will get a SIGPIPE signal(7). Read also pipe(7).
They would get the SIGPIPE when the pipe buffer becomes full.

Kill a unix process by determining the process id using pidof


By : S. Yu
Date : March 29 2020, 07:55 AM
will be helpful for those in need I am trying to kill a process on a node by running , Most simple solution is
code :
kill -9 $(pidof process)
pids=$(pidof process) && kill -9 $pids

Pass data from parent process to its child process — IPC, UNIX


By : Kamlesh Banosekar
Date : March 29 2020, 07:55 AM
wish help you to fix your issue The problem is in the logic. After removing boilerplate code, the logic is as follows:
code :
Get shared memory
Get semaphore with value 1
fork
in parent:
    wait semaphore (problem #1, #2) <-- supposed to decrement it to 0

    for(i=0;i<3;++i)
    {
        write next char <<-- no synchronization here :-(
    }

    signal semaphore 

    wait for child
    STOP

in child:
    wait semaphore (problem #1)
    read next char
    signal semaphore
    (problem #3)
    STOP
the writer acquires write lock
writes 3 values into the same location
then signals the reader to read data.
At this moment writer moves on to wait for child PID to die.

The reader reads the last value once
signals the semaphore
then exits.

At this moment writer sees reader died
cleans up
...and exits
Writer
    Do 3 times:
        acquire write semaphore
        write next value
        signal reader semaphore
    wait child to die
    clean up
    exit

reader:
    Do 3 times:
       acquire reader semaphore
       read next value
       signal writer semaphore
    exit

A Daemon that kills a child process in a signal handler and forks a new process in c/unix


By : supraja banukumar
Date : March 29 2020, 07:55 AM
this one helps. I've created a program that creates a daemon, which in turn spawns and terminates a child process (a "mole") upon receiving a signal. When I send a signal to the process (kill -USR1 589), it kills the daemon too... It also seems to not execute the mole program (program that logs what mole popped up) that I've created. What am I doing incorrectly? Please help!! , You've got a problem with your execv() code:
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