The difference between EACCES and EPERM

Question

What is the difference between EACCES and EPERM? EPERM is described here as “not superuser,” but I usually associate it with EACCES. In fact, I can’t remember that I have ever seen EPERM in real life.

Answer 1

EACCES almost always used when a path was passed to a system call that was not available to the current user.

EPERM used in various situations when you need to be root to perform an action, for example

• kill() in a process that you don’t have.
• link() in the catalog
• reboot()

Answer 2

Linux, EACCES EPERM ! - ...

• EACCES "Permission denied" , . root / .
• EPERM " " , , , root . :
  • chmod FAT ( )
• , Linux EPERM, EACCES.