Hui Guys can anyone tell me what is difference between fork() and vfork()?what is the difference between function call and system call?

fork() Vs vfork():

The basic difference between the two is that when a new process is
created with vfork(), the parent process is temporarily
suspended, and the child process might borrow the parent's address
space. This strange state of affairs continues until the child process
either exits, or calls execve(), at which point the parent
process continues.

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