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Linux: why to execute a program first we need to copy current one?

What's the difference between eval and exec?Why do we need to fork to create new processes?Why is the default process creation mechanism fork?How does copy-on-write in fork() handle multiple fork?closing the unwanted file descriptorsSIGINFO on GNU Linux (Arch Linux) missingPerformance of calling POSIX-specified functions versus direct Linux kernel callsvfork() calls SYS_vfork but fork() calls SYS_clone?Difference Between bg and kill -CONTWhat happens to the old stack, heap, and (initialized and uninitialized) data segments after execve() call?Is there any difference to run a process in the background with an & vs when it has --daemonize option?

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0

Seems to me it is so general question I wanted to ask on Computer Science site but could not find proper tags, so asking here. Mods please move if appropriate.

As I've read in many places, e.g. here What's the difference between eval and exec? to run a program parent process in Linux forks (copies all info) itself then replaces in that fork itself by calling exec with needed program.

Why not just make/start a new process? How is it better (as it was implemented that way, looks like it is better by some criteria)?

I could not find an answer by web search for Linux: why to execute a program first we need to copy (fork) current one? and here on SE questions on exec fork are about technical details, not why type.

linux exec

share|improve this question

asked 19 mins ago

MarishaMarisha

3055 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I've read on one Q&A long ago that this was done for efficiency. Starting new process at the time of the first Unix was expensive in terms of resources, RAM and CPU cycles. Cloning and replacing process via exec was easier. Of course nowadays it's not necessary on regular desktop or server but on something embedded like router or Raspberry Pi that still helps. So you could say historical reasons is one reason
  
  – Sergiy Kolodyazhnyy
  10 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Let me know if you dont get a good answer. I'll try to look up that Q&A I mentioned in my previous comment.
  
  – Sergiy Kolodyazhnyy
  9 mins ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I think it's this one unix.stackexchange.com/q/136637/85039 Maybe even fits as duplicate
  
  – Sergiy Kolodyazhnyy
  7 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Sergiy Kolodyazhnyy, thank you, looks like duplicate, I don't see in my GUI way to mark it as one.
  
  – Marisha
  5 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Possible duplicate of Why do we need to fork to create new processes?
  
  – Sergiy Kolodyazhnyy
  3 mins ago
  

  
  
  
  

 | 
show 3 more comments

0

Seems to me it is so general question I wanted to ask on Computer Science site but could not find proper tags, so asking here. Mods please move if appropriate.

As I've read in many places, e.g. here What's the difference between eval and exec? to run a program parent process in Linux forks (copies all info) itself then replaces in that fork itself by calling exec with needed program.

Why not just make/start a new process? How is it better (as it was implemented that way, looks like it is better by some criteria)?

I could not find an answer by web search for Linux: why to execute a program first we need to copy (fork) current one? and here on SE questions on exec fork are about technical details, not why type.

linux exec

share|improve this question

asked 19 mins ago

MarishaMarisha

3055 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  I've read on one Q&A long ago that this was done for efficiency. Starting new process at the time of the first Unix was expensive in terms of resources, RAM and CPU cycles. Cloning and replacing process via exec was easier. Of course nowadays it's not necessary on regular desktop or server but on something embedded like router or Raspberry Pi that still helps. So you could say historical reasons is one reason
  
  – Sergiy Kolodyazhnyy
  10 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Let me know if you dont get a good answer. I'll try to look up that Q&A I mentioned in my previous comment.
  
  – Sergiy Kolodyazhnyy
  9 mins ago
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  I think it's this one unix.stackexchange.com/q/136637/85039 Maybe even fits as duplicate
  
  – Sergiy Kolodyazhnyy
  7 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Sergiy Kolodyazhnyy, thank you, looks like duplicate, I don't see in my GUI way to mark it as one.
  
  – Marisha
  5 mins ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Possible duplicate of Why do we need to fork to create new processes?
  
  – Sergiy Kolodyazhnyy
  3 mins ago
  

  
  
  
  

 | 
show 3 more comments

Seems to me it is so general question I wanted to ask on Computer Science site but could not find proper tags, so asking here. Mods please move if appropriate.

As I've read in many places, e.g. here What's the difference between eval and exec? to run a program parent process in Linux forks (copies all info) itself then replaces in that fork itself by calling exec with needed program.

Why not just make/start a new process? How is it better (as it was implemented that way, looks like it is better by some criteria)?

I could not find an answer by web search for Linux: why to execute a program first we need to copy (fork) current one? and here on SE questions on exec fork are about technical details, not why type.

linux exec

share|improve this question

asked 19 mins ago

MarishaMarisha

3055 bronze badges

share|improve this question

asked 19 mins ago

MarishaMarisha

3055 bronze badges

share|improve this question

asked 19 mins ago

MarishaMarisha

3055 bronze badges

asked 19 mins ago

MarishaMarisha

3055 bronze badges

asked 19 mins ago

MarishaMarisha

3055 bronze badges