'\" te
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.TH STRERROR 3C "Mar 31, 2005"
.SH NAME
strerror, strerror_r \- get error message string
.SH SYNOPSIS
.LP
.nf
#include <string.h>

\fBchar *\fR\fBstrerror\fR(\fBint\fR \fIerrnum\fR);
.fi

.LP
.nf
\fBint\fR \fBstrerror_r\fR(\fBint\fR \fIerrnum\fR, \fBchar *\fR\fIstrerrbuf\fR, \fBsize_t\fR  \fIbuflen\fR);
.fi

.SH DESCRIPTION
.sp
.LP
The \fBstrerror()\fR function maps the error number in \fIerrnum\fR to an error
message string, and returns a pointer to that string. It uses the same set of
error messages as \fBperror\fR(3C). The returned string should not be
overwritten.
.sp
.LP
The \fBstrerror_r()\fR function maps the error number in \fIerrnum\fR to
anerror message string and returns the string in the buffer pointed to by
\fIstrerrbuf\fR with length \fIbuflen\fR.
.SH RETURN VALUES
.sp
.LP
Upon successful completion, \fBstrerror()\fR returns a pointer to the generated
message string. Otherwise, it sets \fBerrno\fR and returns a pointer to an
error message string. It returns the string "Unknown error" if \fIerrnum\fR is
not a valid error number.
.sp
.LP
Upon successful completion, \fBstrerror_r()\fR returns 0.  Otherwise it sets
\fBerrno\fR and returns the value of \fBerrno\fR to indicate the error. It
returns the string "Unknown error" in the buffer pointed to by \fIstrerrbuf\fR
if \fIerrnum\fR is not a valid error number.
.SH ERRORS
.sp
.LP
These functions may fail if:
.sp
.ne 2
.na
\fB\fBEINVAL\fR\fR
.ad
.RS 10n
The value of \fIerrnum\fR is not a valid error number.
.RE

.sp
.LP
The \fBstrerror_r()\fR function may fail if:
.sp
.ne 2
.na
\fB\fBERANGE\fR\fR
.ad
.RS 10n
The \fIbuflen\fR argument specifies insufficient storage to contain the
generated message string.
.RE

.SH USAGE
.sp
.LP
Messages returned from these functions are in the native language specified by
the \fBLC_MESSAGES\fR locale category. See \fBsetlocale\fR(3C).
.SH ATTRIBUTES
.sp
.LP
See \fBattributes\fR(5) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
Interface Stability	Standard
_
MT-Level	Safe
.TE

.SH SEE ALSO
.sp
.LP
\fBgettext\fR(3C), \fBperror\fR(3C), \fBsetlocale\fR(3C), \fBattributes\fR(5),
\fBstandards\fR(5)