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Manual Pages  — GETUID

NAME

getuid, geteuid – get user identification

CONTENTS

LIBRARY

Standard C Library (libc, -lc)

SYNOPSIS

#include <unistd.h>

uid_t
getuid(void);

uid_t
geteuid(void);

DESCRIPTION

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.

ERRORS

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

SEE ALSO

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

STANDARDS

The geteuid() and getuid() system calls are expected to conform to IEEE Std 1003.1-90 ("POSIX.1").

HISTORY

The getuid() and geteuid() functions appeared in AT&T v4 .

GETUID (2) December 15, 2015

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I think Unix and snowflakes are the only two classes of objects in the universe in which no two instances ever match exactly.
— Noel Chiappa