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Process Redirect Linux Java


Process Redirect Linux Java

By : Gamal Hamza
Date : November 14 2020, 04:48 PM
hope this fix your issue I have this code that works perfectly in Windows: , Found how to have it working for both OS:
code :
Process process = Runtime.getRuntime ().exec (shell);
                    OutputStream stdin = process.getOutputStream ();
                    InputStream stderr = process.getErrorStream ();
                    InputStream stdout = process.getInputStream ();

                    final BufferedReader ProcessIN = new BufferedReader (new InputStreamReader(stdout));
                    final BufferedReader ProcessERROR = new BufferedReader (new InputStreamReader(stderr));
                    final BufferedWriter ProcessOUT = new BufferedWriter(new OutputStreamWriter(stdin));


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Redirect stdout of two processes to another process's stdin in Linux C

Redirect stdout of two processes to another process's stdin in Linux C


By : David Corna
Date : March 29 2020, 07:55 AM
I hope this helps you . I'm not sure that it's a good idea, but it is perfectly feasible. The key observation is that you only need one pipe. Several processes (with a common parent) can write to a single pipe. However, only one file descriptor can be used as the standard input. In the original code, only one of the pipes was connected to C as its standard input (the others were still connected, but mainly because you hadn't closed enough descriptors).
Rule of thumb: if you connect one end of a pipe to standard input or standard output via dup2() (or dup()), you should close both of the file descriptors returned by pipe().
code :
#include <unistd.h>

int main(void)
{
    int ABtoC[2];
    pipe(ABtoC);

    if (fork() > 0)
    {
        // Process A
        close(ABtoC[0]);
        dup2(ABtoC[1], STDOUT_FILENO);
        close(ABtoC[1]);     // Close this too!
        // Process A writing to C
        for (int i = 0; i < 100; i++)
        {
            write(STDOUT_FILENO, "Hi\n", sizeof("Hi\n")-1);
            usleep(5000);
        }
    }
    else if (fork() > 0)
    {
        // Process B
        close(ABtoC[0]);
        dup2(ABtoC[1], STDOUT_FILENO);
        close(ABtoC[1]);
        // Process B writing to C
        for (int i = 0; i < 100; i++)
        {
            write(STDOUT_FILENO, "Lo\n", sizeof("Lo\n")-1);
            usleep(5000);
        }
    }
    else
    {
        char buffer[100];
        ssize_t nbytes;
        close(ABtoC[1]);
        dup2(ABtoC[0], STDIN_FILENO);
        close(ABtoC[0]);
        // Process C reading from both A and B
        while ((nbytes = read(STDIN_FILENO, buffer, sizeof(buffer))) > 0)
            write(STDOUT_FILENO, buffer, nbytes);
    }
    return(0);
}
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How to redirect all output of a screen background process in Linux?

How to redirect all output of a screen background process in Linux?


By : xzdvfzdf
Date : March 29 2020, 07:55 AM
help you fix your problem Try using the screen's logging feature. You can invoke this with the -L option.
code :
screen -L -m -d -S some_name_to_reference_it my_program
How to redirect output of a spawned child process in Linux?

How to redirect output of a spawned child process in Linux?


By : Eten Gold
Date : March 29 2020, 07:55 AM
I wish this helpful for you The '>' redirection is not valid in execl as it is a shell command....
Try to look at Running a script from execl() for an example of how to invoke a shell to do your execution....
code :
 if (pid == 0)
     {
         //child process.
         close(1);
         creat("/tmp/version",0644); // this will create a new stdout
         close(2);
         dup(1);   // this will make stderr to also go to the same file.....

         execl("/opt/bin/version.out", "version.out",0);
         perror("execl didn't work"); // print out the error if execl failed...
         _exit(0);
     }.....
Java ProcessBuilder daemon process redirect output to file without terminating process after exiting jvm

Java ProcessBuilder daemon process redirect output to file without terminating process after exiting jvm


By : tibo
Date : March 29 2020, 07:55 AM
This might help you According to https://pubs.opengroup.org/onlinepubs/9699919799/functions/exec.html#tag_16_111_03 if parent processes ignore signals, their children will too.
So the easy fix here is to start my parent java process with nohup or append a &
linux : how to redirect to a file and to another process

linux : how to redirect to a file and to another process


By : Fang Wu
Date : March 29 2020, 07:55 AM
I hope this helps you . Have a look at the tee command. It might be what you are looking for. Example:
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