Return the numeric effective user ID of the current process. See also posix_getpwuid() for information on how to convert this into a useable username.
Example 1. posix_geteuid() example
This example will show the current user id then set the effective user id to a separate id using posix_seteuid(), then show the difference between the real id and the effective id.
Returns the user id, as an integer
|posix_getpwuid() for more information about the user.|
|posix_getuid() get real user id.|
|posix_setuid() change the effective user id|
|POSIX man page GETEUID(2)|