exec.md

EXEC

It is a family of functions that do the same thing but actually no. When we call exec(), we never reutrn back to the callling program. The program called by the exec() function replaces itself with the calling progam. The only way that we could return to original process if exec() fails to execute. Thats why we usually use fork() & exec(), so that we can safely return to main process without losing anything :).

what stays:

• PID, PPID
• opened file descriptors
• current directory, root directory

what does not:

• code
• stack
• heap
• data

(new stack and new heap)

sufixes:

• l ~ arguments are passed as function arguments
• v ~ arguments are passed by char array
• p ~ search in $PATH for provided executable
• P ~ specifying that we will provide a path to an executable
• e ~ enviromental variables are provided in a char array