What does fork() actually return?

Source code can be found here:
code-vault.net/lesson/c5746b1...
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[@abhijitarun2415]

@CodeVault when a child is created it will have all lines of code that is below the fork() statement right? but here fork() is assigned to id and its in the same line . so how does child id gets value 0? if the child gets all the set values from parent then the id should be +ve ???

[@CodeVault]

Yes, the child process actually is a complete copy of the parent process. All that's different is what fork() actually returns

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[@vilijanac]

Child process continues from the the fork statement, and what happens to memory is also interesting. The child gets a copy of all the set values by the parent. Unless the variables are a pointers. Is that correct?

[@CodeVault]

The child process gets a copy of all variables. Even pointers (although they might not point to what you expect them to)

[@vilijanac]

@@CodeVault I see, thanks, possibly point to the pointer, to some shared memory which could be dangerous.

[@tendulkarzone8463]

could you pls explain why this code prints 4 times hello ? int main() { int pid, pid2; pid = fork(); if (pid){ pid2 = fork(); printf("hello"); } else { printf("hello"); pid2 = fork(); } return 0; }

[@CodeVault]

Well, it should only print "hello" 3 times. Twice in the if(pid) and once in the else block

[@tendulkarzone8463]

@@CodeVault I also agree with your point but in some of the online compilers (eg: one compiler) it's actually printing "hello" 4 times. that's why confused.

[@CodeVault]

I tried it myself before replying and it only prints "hello" 3 times. Maybe it's using a previous version of the code?

[@tendulkarzone8463]

@@CodeVault that might be the reason