[syserror] Add conversions to linuxerr with temporary Equals method.

Add Equals method to compare syserror and unix.Errno errors to linuxerr errors.
This will facilitate removal of syserror definitions in a followup, and
finding needed conversions from unix.Errno to linuxerr.

PiperOrigin-RevId: 380909667

2 files changed, 3 insertions, 1 deletions

diff --git a/pkg/syserr/BUILD b/pkg/syserr/BUILD
index 7b3160309..5205fa7e4 100644
--- a/pkg/syserr/BUILD
+++ b/pkg/syserr/BUILD
@@ -12,6 +12,7 @@ go_library(
     visibility = ["//visibility:public"],
     deps = [
         "//pkg/abi/linux/errno",
+        "//pkg/errors/linuxerr",
         "//pkg/syserror",
         "//pkg/tcpip",
         "@org_golang_x_sys//unix:go_default_library",
diff --git a/pkg/syserr/syserr.go b/pkg/syserr/syserr.go
index fb77ac8bd..7d0a5125b 100644
--- a/pkg/syserr/syserr.go
+++ b/pkg/syserr/syserr.go
@@ -22,6 +22,7 @@ import (
 
 	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/abi/linux/errno"
+	"gvisor.dev/gvisor/pkg/errors/linuxerr"
 	"gvisor.dev/gvisor/pkg/syserror"
 )
 
@@ -54,7 +55,7 @@ func New(message string, linuxTranslation errno.Errno) *Error {
 	// enables proper blocking semantics. This should temporary address the
 	// class of blocking bugs that keep popping up with the current state of
 	// the error space.
-	if e == syserror.EWOULDBLOCK {
+	if err.errno == linuxerr.EWOULDBLOCK.Errno() {
 		e = syserror.ErrWouldBlock
 	}
 	linuxBackwardsTranslations[err.errno] = linuxBackwardsTranslation{err: e, ok: true}