160 lines
3.2 KiB
HTML
160 lines
3.2 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<HTML><HEAD><TITLE>Man page of GETUID</TITLE>
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</HEAD><BODY>
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<H1>GETUID</H1>
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Section: Linux Programmer's Manual (2)<BR>Updated: 2019-03-06<BR><A HREF="#index">Index</A>
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<A HREF="/cgi-bin/man/man2html">Return to Main Contents</A><HR>
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<A NAME="lbAB"> </A>
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<H2>NAME</H2>
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getuid, geteuid - get user identity
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<A NAME="lbAC"> </A>
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<H2>SYNOPSIS</H2>
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<B>#include <<A HREF="file:///usr/include/unistd.h">unistd.h</A>></B>
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<BR>
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<B>#include <<A HREF="file:///usr/include/sys/types.h">sys/types.h</A>></B>
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<P>
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<B>uid_t getuid(void);</B>
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<BR>
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<B>uid_t geteuid(void);</B>
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<A NAME="lbAD"> </A>
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<H2>DESCRIPTION</H2>
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<B>getuid</B>()
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returns the real user ID of the calling process.
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<P>
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<B>geteuid</B>()
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returns the effective user ID of the calling process.
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<A NAME="lbAE"> </A>
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<H2>ERRORS</H2>
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These functions are always successful.
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<A NAME="lbAF"> </A>
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<H2>CONFORMING TO</H2>
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POSIX.1-2001, POSIX.1-2008, 4.3BSD.
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<A NAME="lbAG"> </A>
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<H2>NOTES</H2>
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<A NAME="lbAH"> </A>
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<H3>History</H3>
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In UNIX V6 the
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<B>getuid</B>()
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call returned
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<I>(euid << 8) + uid</I>.
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UNIX V7 introduced separate calls
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<B>getuid</B>()
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and
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<B>geteuid</B>().
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<P>
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The original Linux
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<B>getuid</B>()
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and
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<B>geteuid</B>()
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system calls supported only 16-bit user IDs.
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Subsequently, Linux 2.4 added
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<B>getuid32</B>()
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and
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<B>geteuid32</B>(),
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supporting 32-bit IDs.
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The glibc
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<B>getuid</B>()
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and
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<B>geteuid</B>()
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wrapper functions transparently deal with the variations across kernel versions.
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<P>
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On Alpha, instead of a pair of
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<B>getuid</B>()
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and
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<B>geteuid</B>()
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system calls, a single
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<B>getxuid</B>()
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system call is provided, which returns a pair of real and effective UIDs.
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The glibc
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<B>getuid</B>()
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and
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<B>geteuid</B>()
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wrapper functions transparently deal with this.
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See
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<B><A HREF="/cgi-bin/man/man2html?2+syscall">syscall</A></B>(2)
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for details regarding register mapping.
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<A NAME="lbAI"> </A>
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<H2>SEE ALSO</H2>
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<B><A HREF="/cgi-bin/man/man2html?2+getresuid">getresuid</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+setreuid">setreuid</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?2+setuid">setuid</A></B>(2),
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<B><A HREF="/cgi-bin/man/man2html?7+credentials">credentials</A></B>(7)
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<A NAME="lbAJ"> </A>
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<H2>COLOPHON</H2>
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This page is part of release 5.05 of the Linux
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<I>man-pages</I>
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project.
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A description of the project,
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information about reporting bugs,
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and the latest version of this page,
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can be found at
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<A HREF="https://www.kernel.org/doc/man-pages/.">https://www.kernel.org/doc/man-pages/.</A>
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<P>
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<HR>
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<A NAME="index"> </A><H2>Index</H2>
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<DL>
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<DT id="1"><A HREF="#lbAB">NAME</A><DD>
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<DT id="2"><A HREF="#lbAC">SYNOPSIS</A><DD>
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<DT id="3"><A HREF="#lbAD">DESCRIPTION</A><DD>
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<DT id="4"><A HREF="#lbAE">ERRORS</A><DD>
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<DT id="5"><A HREF="#lbAF">CONFORMING TO</A><DD>
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<DT id="6"><A HREF="#lbAG">NOTES</A><DD>
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<DL>
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<DT id="7"><A HREF="#lbAH">History</A><DD>
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</DL>
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<DT id="8"><A HREF="#lbAI">SEE ALSO</A><DD>
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<DT id="9"><A HREF="#lbAJ">COLOPHON</A><DD>
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</DL>
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<HR>
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This document was created by
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<A HREF="/cgi-bin/man/man2html">man2html</A>,
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using the manual pages.<BR>
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Time: 00:05:32 GMT, March 31, 2021
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</BODY>
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</HTML>
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