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-.\" Copyright 1993 Rickard E. Faith (faith@cs.unc.edu)
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.\" Historical remark, aeb, 2004-06-05
-.TH getuid 2 (date) "Linux man-pages (unreleased)"
-.SH NAME
-getuid, geteuid \- get user identity
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.B #include <unistd.h>
-.P
-.B uid_t getuid(void);
-.B uid_t geteuid(void);
-.fi
-.SH DESCRIPTION
-.BR getuid ()
-returns the real user ID of the calling process.
-.P
-.BR geteuid ()
-returns the effective user ID of the calling process.
-.SH ERRORS
-These functions are always successful
-and never modify
-.\" https://www.austingroupbugs.net/view.php?id=511
-.\" 0000511: getuid and friends should not modify errno
-.IR errno .
-.SH STANDARDS
-POSIX.1-2008.
-.SH HISTORY
-POSIX.1-2001, 4.3BSD.
-.P
-In UNIX\ V6 the
-.BR getuid ()
-call returned
-.IR "(euid << 8) + uid" .
-UNIX\ V7 introduced separate calls
-.BR getuid ()
-and
-.BR geteuid ().
-.P
-The original Linux
-.BR getuid ()
-and
-.BR geteuid ()
-system calls supported only 16-bit user IDs.
-Subsequently, Linux 2.4 added
-.BR getuid32 ()
-and
-.BR geteuid32 (),
-supporting 32-bit IDs.
-The glibc
-.BR getuid ()
-and
-.BR geteuid ()
-wrapper functions transparently deal with the variations across kernel versions.
-.P
-On Alpha, instead of a pair of
-.BR getuid ()
-and
-.BR geteuid ()
-system calls, a single
-.BR getxuid ()
-system call is provided, which returns a pair of real and effective UIDs.
-The glibc
-.BR getuid ()
-and
-.BR geteuid ()
-wrapper functions transparently deal with this.
-See
-.BR syscall (2)
-for details regarding register mapping.
-.SH SEE ALSO
-.BR getresuid (2),
-.BR setreuid (2),
-.BR setuid (2),
-.BR credentials (7)