code: 9ferno

ref: 83246e296ea433b65b9d295b5e08fedd39ff1ab7
dir: /man/2/sys-werrstr/

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.TH SYS-WERRSTR 2
.SH NAME
werrstr \- set the system error string
.SH SYNOPSIS
.EX
include "sys.m";
sys := load Sys Sys->PATH;

werrstr(s: string): int;
.EE
.SH DESCRIPTION
When a system call fails, it returns an error value (often -1)
and records a string describing the error in a per-process location.
The verb
.B r
in
.IR sys-print (2)
outputs the error string.
.B Werrstr
sets the process's error string to
.IR s ,
to allow a function in a module to mimic the error reporting
interface of a system call.
.SH SEE ALSO
.IR sys-intro (2),
.IR sys-print (2)