mirror of https://github.com/mkerrisk/man-pages
78 lines
2.2 KiB
Groff
78 lines
2.2 KiB
Groff
.\" Copyright 1993 Rickard E. Faith (faith@cs.unc.edu)
|
|
.\"
|
|
.\" %%%LICENSE_START(VERBATIM)
|
|
.\" Permission is granted to make and distribute verbatim copies of this
|
|
.\" manual provided the copyright notice and this permission notice are
|
|
.\" preserved on all copies.
|
|
.\"
|
|
.\" Permission is granted to copy and distribute modified versions of this
|
|
.\" manual under the conditions for verbatim copying, provided that the
|
|
.\" entire resulting derived work is distributed under the terms of a
|
|
.\" permission notice identical to this one.
|
|
.\"
|
|
.\" Since the Linux kernel and libraries are constantly changing, this
|
|
.\" manual page may be incorrect or out-of-date. The author(s) assume no
|
|
.\" responsibility for errors or omissions, or for damages resulting from
|
|
.\" the use of the information contained herein. The author(s) may not
|
|
.\" have taken the same level of care in the production of this manual,
|
|
.\" which is licensed free of charge, as they might when working
|
|
.\" professionally.
|
|
.\"
|
|
.\" Formatted or processed versions of this manual, if unaccompanied by
|
|
.\" the source, must acknowledge the copyright and authors of this work.
|
|
.\" %%%LICENSE_END
|
|
.\"
|
|
.\" Historical remark, aeb, 2004-06-05
|
|
.TH GETUID 2 2010-11-22 "Linux" "Linux Programmer's Manual"
|
|
.SH NAME
|
|
getuid, geteuid \- get user identity
|
|
.SH SYNOPSIS
|
|
.B #include <unistd.h>
|
|
.br
|
|
.B #include <sys/types.h>
|
|
.sp
|
|
.B uid_t getuid(void);
|
|
.br
|
|
.B uid_t geteuid(void);
|
|
.SH DESCRIPTION
|
|
.BR getuid ()
|
|
returns the real user ID of the calling process.
|
|
|
|
.BR geteuid ()
|
|
returns the effective user ID of the calling process.
|
|
.SH ERRORS
|
|
These functions are always successful.
|
|
.SH CONFORMING TO
|
|
POSIX.1-2001, 4.3BSD.
|
|
.SH NOTES
|
|
.SS History
|
|
In UNIX\ V6 the
|
|
.BR getuid ()
|
|
call returned
|
|
.IR "(euid << 8) + uid" .
|
|
UNIX\ V7 introduced separate calls
|
|
.BR getuid ()
|
|
and
|
|
.BR geteuid ().
|
|
|
|
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.
|
|
.SH SEE ALSO
|
|
.BR getresuid (2),
|
|
.BR setreuid (2),
|
|
.BR setuid (2),
|
|
.BR credentials (7)
|