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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "STRERROR" 3P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" strerror 
+.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
+strerror, strerror_r \- get error message string
+.SH SYNOPSIS
+.LP
+\fB#include <string.h>
+.br
+.sp
+char *strerror(int\fP \fIerrnum\fP\fB);
+.br
+\fP
+.LP
+\fBint strerror_r(int\fP \fIerrnum\fP\fB, char *\fP\fIstrerrbuf\fP\fB,
+size_t\fP
+\fIbuflen\fP\fB); \fP
+\fB
+.br
+\fP
+.SH DESCRIPTION
+.LP
+For \fIstrerror\fP():   The functionality described on this reference
+page is aligned with the ISO\ C standard. Any
+conflict between the requirements described here and the ISO\ C standard
+is unintentional. This volume of
+IEEE\ Std\ 1003.1-2001 defers to the ISO\ C standard. 
+.LP
+The \fIstrerror\fP() function shall map the error number in \fIerrnum\fP
+to a locale-dependent error message string and shall
+return a pointer to it. Typically, the values for \fIerrnum\fP come
+from \fIerrno\fP, but \fIstrerror\fP() shall map any value
+of type \fBint\fP to a message.
+.LP
+The string pointed to shall not be modified by the application, but
+may be overwritten by a subsequent call to \fIstrerror\fP()
+\ or \fIperror\fP(). 
+.LP
+The
+contents of the error message strings returned by \fIstrerror\fP()
+should be determined by the setting of the \fILC_MESSAGES\fP
+category in the current locale. 
+.LP
+The implementation shall behave as if no function defined in this
+volume of IEEE\ Std\ 1003.1-2001 calls
+\fIstrerror\fP().
+.LP
+The
+\fIstrerror\fP() function shall not change the setting of \fIerrno\fP
+if successful.
+.LP
+Since no return value is reserved to indicate an error, an application
+wishing to check for error situations should set
+\fIerrno\fP to 0, then call \fIstrerror\fP(), then check \fIerrno\fP.
+.LP
+The \fIstrerror\fP() function need not be reentrant. A function that
+is not required to be reentrant is not required to be
+thread-safe. 
+.LP
+The \fIstrerror_r\fP() function shall map the error number in \fIerrnum\fP
+to a locale-dependent error message string and shall
+return the string in the buffer pointed to by \fIstrerrbuf\fP, with
+length \fIbuflen\fP. 
+.SH RETURN VALUE
+.LP
+Upon successful completion, \fIstrerror\fP() shall return a pointer
+to the generated message string. On error \fIerrno\fP may
+be set, but no return value is reserved to indicate an error.
+.LP
+Upon successful completion, \fIstrerror_r\fP() shall return 0. Otherwise,
+an error number shall be returned to indicate the error.
+.SH ERRORS
+.LP
+These functions may fail if:
+.TP 7
+.B EINVAL
+The value of \fIerrnum\fP is not a valid error number.
+.sp
+.LP
+The \fIstrerror_r\fP() function may fail if:
+.TP 7
+.B ERANGE
+Insufficient storage was supplied via \fIstrerrbuf\fP and \fIbuflen\fP
+to contain the generated message string. 
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+None.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fIperror\fP(), the Base Definitions volume of IEEE\ Std\ 1003.1-2001,
+\fI<string.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 .