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Man Pages
GETUID(2) FreeBSD System Calls Manual GETUID(2)

getuid, geteuid
get user identification

Standard C Library (libc, -lc)

#include <unistd.h>
uid_t
getuid(void);
uid_t
geteuid(void);

The getuid() system call returns the real user ID of the calling process. The geteuid() system call returns the effective user ID of the calling process.
The real user ID is that of the user who has invoked the program. As the effective user ID gives the process additional permissions during execution of “set-user-ID” mode processes, getuid() is used to determine the real-user-id of the calling process.

The getuid() and geteuid() system calls are always successful, and no return value is reserved to indicate an error.

getgid(2), issetugid(2), setgid(2), setreuid(2), setuid(2)

The geteuid() and getuid() system calls are expected to conform to IEEE Std 1003.1-1990 (“POSIX.1”).

The getuid() function appeared in Version 1 AT&T UNIX. The geteuid() function appeared in Version 4 AT&T UNIX.
December 1, 2017 FreeBSD 12.0-RELEASE

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