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+'\" et
+.TH GETEUID "3P" 2017 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\"
+.SH PROLOG
+This manual page is part of the POSIX Programmer's Manual.
+The Linux implementation of this interface may differ (consult
+the corresponding Linux manual page for details of Linux behavior),
+or the interface may not be implemented on Linux.
+.\"
+.SH NAME
+geteuid
+\(em get the effective user ID
+.SH SYNOPSIS
+.LP
+.nf
+#include <unistd.h>
+.P
+uid_t geteuid(void);
+.fi
+.SH DESCRIPTION
+The
+\fIgeteuid\fR()
+function shall return the effective user ID of the calling process.
+The
+\fIgeteuid\fR()
+function shall not modify
+.IR errno .
+.SH "RETURN VALUE"
+The
+\fIgeteuid\fR()
+function shall always be successful and no return value is reserved to
+indicate an error.
+.SH ERRORS
+No errors are defined.
+.LP
+.IR "The following sections are informative."
+.SH EXAMPLES
+None.
+.SH "APPLICATION USAGE"
+None.
+.SH RATIONALE
+In a conforming environment,
+\fIgeteuid\fR()
+will always succeed. It is possible for implementations to provide
+an extension where a process in a non-conforming environment will
+not be associated with a user or group ID. It is recommended that such
+implementations return (\c
+.BR uid_t )\-1
+and set
+.IR errno
+to indicate such an environment; doing so does not violate
+this standard, since such an environment is already an extension.
+.SH "FUTURE DIRECTIONS"
+None.
+.SH "SEE ALSO"
+.IR "\fIgetegid\fR\^(\|)",
+.IR "\fIgetgid\fR\^(\|)",
+.IR "\fIgetuid\fR\^(\|)",
+.IR "\fIsetegid\fR\^(\|)",
+.IR "\fIseteuid\fR\^(\|)",
+.IR "\fIsetgid\fR\^(\|)",
+.IR "\fIsetregid\fR\^(\|)",
+.IR "\fIsetreuid\fR\^(\|)",
+.IR "\fIsetuid\fR\^(\|)"
+.P
+The Base Definitions volume of POSIX.1\(hy2017,
+.IR "\fB<sys_types.h>\fP",
+.IR "\fB<unistd.h>\fP"
+.\"
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1-2017, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 7, 2018 Edition,
+Copyright (C) 2018 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group.
+In the event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .
+.PP
+Any typographical or formatting errors that appear
+in this page are most likely
+to have been introduced during the conversion of the source files to
+man page format. To report such errors, see
+https://www.kernel.org/doc/man-pages/reporting_bugs.html .