| // errstr_glibc.go -- GNU/Linux and GNU/Hurd specific error strings. |
| |
| // Copyright 2010 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| // We use this rather than errstr.go because on GNU/Linux sterror_r |
| // returns a pointer to the error message, and may not use buf at all. |
| |
| //go:build hurd || linux |
| // +build hurd linux |
| |
| package syscall |
| |
| import "unsafe" |
| |
| //sysnb strerror_r(errnum int, b []byte) (errstr *byte) |
| //strerror_r(errnum _C_int, b *byte, len Size_t) *byte |
| |
| func Errstr(errnum int) string { |
| a := make([]byte, 128) |
| p := strerror_r(errnum, a) |
| b := (*[1000]byte)(unsafe.Pointer(p)) |
| i := 0 |
| for b[i] != 0 { |
| i++ |
| } |
| // Lowercase first letter: Bad -> bad, but STREAM -> STREAM. |
| if i > 1 && 'A' <= b[0] && b[0] <= 'Z' && 'a' <= b[1] && b[1] <= 'z' { |
| c := b[0] + 'a' - 'A' |
| return string(c) + string(b[1:i]) |
| } |
| return string(b[:i]) |
| } |