.TH ERRSTR 2
.SH NAME
errstr \- description of last system call error
.SH SYNOPSIS
.B
int errstr(char *ans)
.SH DESCRIPTION
When a system call fails it returns \-1 and
records a string describing the error in a per-process buffer.
.I Errstr
copies the contents of that buffer into the array
.I ans
and clears the buffer.
.I Ans
should contain at least
.B ERRLEN
characters (defined in
.BR <libc.h> ).
.PP
The verb
.B r
in
.IR print (2)
calls
.I errstr
and outputs the error string.
.SH SEE ALSO
.IR intro (2),
.IR perror (2)