geteuid (2)

Leading comments

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	The Regents of the University of California.  All rights reserved.

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(The comments found at the beginning of the groff file "man2/geteuid.2freebsd".)

NAME

getuid geteuid - get user identification

LIBRARY

Lb libc

SYNOPSIS

In unistd.h In sys/types.h Ft uid_t Fn getuid void Ft uid_t Fn geteuid void

DESCRIPTION

The Fn getuid system call returns the real user ID of the calling process. The Fn 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, Fn getuid is used to determine the real-user-id of the calling process.

ERRORS

The Fn getuid and Fn 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 Fn geteuid and Fn getuid system calls are expected to conform to St -p1003.1-90 .

HISTORY

The Fn getuid and Fn geteuid functions appeared in AT&T System v7 .