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Create exactly 5 process with fork()


By : Alex
Date : September 15 2020, 01:00 AM
seems to work fine When you create a fork, both the parent and the newly created child process continue from the point of forking. So, if you have a loop running three times with fork, the parent creates three children, the first child creates two children, and so on. So, your example will result in more than five processes.
When a fork is created, you can record the pid (process ID). In the child process, the pid value of itself will be 0, while the parent process will have the child's pid stored. You can use this to control subsequent forks.
code :
pid_t pid;
pid = fork();

// this will be true only in the child process
// so, only the child creates another process, resulting in a total of
// three processes
if (pid == 0) {
    fork();
}


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How to create a process on Mac OS using fork() and exec()


By : sanjay_nakate
Date : March 29 2020, 07:55 AM
I wish this help you The following program, adapted from your code, works just fine for me under OS X:
code :
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>

int main (void) {
    pid_t processId;
    if ((processId = fork()) == 0) {
        char app[] = "/bin/echo";
        char * const argv[] = { app, "success", NULL };
        if (execv(app, argv) < 0) {
            perror("execv error");
        }
    } else if (processId < 0) {
        perror("fork error");
    } else {
        return EXIT_SUCCESS;
    }
    return EXIT_FAILURE;
}

create a child process by fork() a parent process in shell script


By : Дмитрий Гамбаров
Date : March 29 2020, 07:55 AM
this will help The ampersand (&) after a command will run it in a forked subshell.
code :
fpfunction &

Does !fork() create a process?


By : crashterminal
Date : March 29 2020, 07:55 AM
this one helps. It is the same, fork is evaluated before check is made.
if (!fork()) is the same as if (fork()) for function itself but not the same for if statement check.

Can a WoW64 process create/fork/etc pure x64 process?


By : user3886743
Date : March 29 2020, 07:55 AM
This might help you Yes, it can. Before you launch notepad you will need to turn off WOW64 redirection in order to get the correct executable to launch.
Edit: Now you've clarified it's not actually Notepad but your own 64 bit executable, this code should launch it as a true 64 bit process:

I try to create a process using 'fork'


By : Ken Minardo
Date : March 29 2020, 07:55 AM
I wish this help you I'm start to studying the fork. while using the fork, I have some problems. I'm trying to create a single parent process with two child and two child trying to make each three grandchild. When I run my code, unlike my expectations, so many child and grandchild come out. , One important example before using fork() statements :
code :
//Calculate number of times hello is printed.
#include  <stdio.h>
#include  <sys/types.h>
int main()
{
    fork();
    fork();
    fork();
    printf("hello\n");
    return 0;
}
fork ();   // Line 1
fork ();   // Line 2
fork ();   // Line 3

       L1       // There will be 1 child process 
    /     \     // created by line 1.
  L2      L2    // There will be 2 child processes
 /  \    /  \   //  created by line 2
L3  L3  L3  L3  // There will be 4 child processes 
                // created by line 3
if(fork()) # parent
    if(fork()) #parent
    else # child2
else #child1
for (i = 0; i < n; ++i) {
    pid = fork();
    if (pid) {  //means pid is non-zero value, i.e, pid>0
        continue;
    } else if (pid == 0) {
        break;
    } else {
        printf("fork error\n");
        exit(1);
    }
}
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