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runtime: change fcntl to return two values

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Separate the result and the errno value, rather than assuming
that the result can never be negative.

Change-Id: Ib01a70a3d46285aa77e95371cdde74e1504e7c12
Reviewed-on: https://go-review.googlesource.com/c/go/+/496416
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Run-TryBot: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@google.com>
Reviewed-by: Bryan Mills <bcmills@google.com>
Auto-Submit: Ian Lance Taylor <iant@google.com>
This commit is contained in:
Ian Lance Taylor 2023-05-18 21:13:03 -07:00 • committed by Gopher Robot
parent 9c447b7cf6
commit 10532fdb14
28 changed files with 179 additions and 109 deletions
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8
src/internal/syscall/unix/fcntl_unix.go
View file

@ -14,12 +14,12 @@ import (
// Implemented in the runtime package.
//
//go:linkname fcntl runtime.fcntl
func fcntl(fd int32, cmd int32, arg int32) int32
func fcntl(fd int32, cmd int32, arg int32) (int32, int32)
func Fcntl(fd int, cmd int, arg int) (int, error) {
val := fcntl(int32(fd), int32(cmd), int32(arg))
if val < 0 {
return 0, syscall.Errno(-val)
val, errno := fcntl(int32(fd), int32(cmd), int32(arg))
if val == -1 {
return int(val), syscall.Errno(errno)
}
return int(val), nil
}