syscall: drop fallback to accept in Accept on Linux

The minimum required Linux kernel version for Go 1.18 will be changed to
2.6.32, see #45964. The current minimum required version is 2.6.23 and
accept4 was added in 2.6.28, so the fallback to accept in Accept on
Linux can be removed.

For #45964

Change-Id: I78fc4e5b58417bbc540912c9dbf1b1b3db888fea
Reviewed-on: https://go-review.googlesource.com/c/go/+/346849
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

diff --git a/src/syscall/syscall_linux.go b/src/syscall/syscall_linux.go
index a2dba54b97ddf89ffda4b88ab209be924f128cb8..6d428d58ddb108cd26dc88a4e5fc961562734f48 100644 (file)
--- a/src/syscall/syscall_linux.go
+++ b/src/syscall/syscall_linux.go
@@ -542,11 +542,7 @@ func anyToSockaddr(rsa *RawSockaddrAny) (Sockaddr, error) {
 func Accept(fd int) (nfd int, sa Sockaddr, err error) {
        var rsa RawSockaddrAny
        var len _Socklen = SizeofSockaddrAny
-       // Try accept4 first for Android, then try accept for kernel older than 2.6.28
        nfd, err = accept4(fd, &rsa, &len, 0)
-       if err == ENOSYS {
-               nfd, err = accept(fd, &rsa, &len)
-       }
        if err != nil {
                return
        }