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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "ERRNO" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" errno 
+.SH NAME
+errno \- error return value
+.SH SYNOPSIS
+.LP
+\fB#include <errno.h>\fP
+.SH DESCRIPTION
+.LP
+The lvalue \fIerrno\fP is used by many functions to return error values.
+.LP
+Many functions provide an error number in \fIerrno\fP, which has type
+\fBint\fP and is defined in \fI<errno.h>\fP. The value of \fIerrno\fP
+shall be defined only after a call to a function
+for which it is explicitly stated to be set and until it is changed
+by the next function call or if the application assigns it a
+value. The value of \fIerrno\fP should only be examined when it is
+indicated to be valid by a function's return value.
+Applications shall obtain the definition of \fIerrno\fP by the inclusion
+of \fI<errno.h>\fP. No function in this volume of IEEE\ Std\ 1003.1-2001
+shall set
+\fIerrno\fP to 0.
+.LP
+It is unspecified whether \fIerrno\fP is a macro or an identifier
+declared with external linkage. If a macro definition is
+suppressed in order to access an actual object, or a program defines
+an identifier with the name \fIerrno\fP, the behavior is
+undefined.
+.LP
+The symbolic values stored in \fIerrno\fP are documented in the ERRORS
+sections on all relevant pages.
+.SH RETURN VALUE
+.LP
+None.
+.SH ERRORS
+.LP
+None.
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+Previously both POSIX and X/Open documents were more restrictive than
+the ISO\ C standard in that they required \fIerrno\fP
+to be defined as an external variable, whereas the ISO\ C standard
+required only that \fIerrno\fP be defined as a modifiable
+lvalue with type \fBint\fP.
+.LP
+An application that needs to examine the value of \fIerrno\fP to determine
+the error should set it to 0 before a function call,
+then inspect it before a subsequent function call.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIError Numbers\fP , the Base Definitions volume of IEEE\ Std\ 1003.1-2001,
+\fI<errno.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 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 .