geteuid - get the effective user ID
The geteuid() function shall return the effective user ID of the calling process.
The geteuid() function shall always be successful and no return value is reserved to indicate an error.
No errors are defined.
getegid(), getgid(), getuid(), setegid(), seteuid(), setgid(), setregid(), setreuid(), setuid(), the Base Definitions volume of IEEE Std 1003.1-2001, <sys/types.h>, <unistd.h>
First released in Issue 1. Derived from Issue 1 of the SVID.
In the SYNOPSIS, the optional include of the <sys/types.h> header is removed.
The following new requirements on POSIX implementations derive from alignment with the Single UNIX Specification: