Unix Programming - Difference between euid and uid

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Author Difference between euid and uid
lak

2007-11-20, 7:34 am

What is the difference between EUID ans UID?
When it will be used?
Rainer Weikusat

2007-11-20, 7:34 am

lak <lakindia89@gmail.com> writes:
> What is the difference between EUID ans UID?
> When it will be used?

The UID (also called 'real user-id') is the id of the user who created
a particular process (or the id a process running as root used as
argument to a setuid-call) and the effective user-id (EUID) is the one
used to determine access permissions, eg to files. They differ of some
user executed a file which was setuid (permission bit) to some other
user. In this case, the EUID would be the other user's id.
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