34324031cb
Signed-off-by: Adrian Cole <adrian@tetrate.io> Signed-off-by: Edoardo Vacchi <evacchi@users.noreply.github.com> Co-authored-by: Edoardo Vacchi <evacchi@users.noreply.github.com>
46 lines
1.3 KiB
Go
46 lines
1.3 KiB
Go
package sysfs
|
|
|
|
import (
|
|
"syscall"
|
|
"time"
|
|
"unsafe"
|
|
|
|
"github.com/tetratelabs/wazero/internal/platform"
|
|
)
|
|
|
|
// syscall_select invokes select on Darwin, with the given timeout Duration.
|
|
// We implement our own version instead of relying on syscall.Select because the latter
|
|
// only returns the error and discards the result.
|
|
func syscall_select(n int, r, w, e *platform.FdSet, timeout *time.Duration) (int, error) {
|
|
var t *syscall.Timeval
|
|
if timeout != nil {
|
|
tv := syscall.NsecToTimeval(timeout.Nanoseconds())
|
|
t = &tv
|
|
}
|
|
result, _, errno := syscall_syscall6(
|
|
libc_select_trampoline_addr,
|
|
uintptr(n),
|
|
uintptr(unsafe.Pointer(r)),
|
|
uintptr(unsafe.Pointer(w)),
|
|
uintptr(unsafe.Pointer(e)),
|
|
uintptr(unsafe.Pointer(t)),
|
|
0)
|
|
res := int(result)
|
|
if errno == 0 {
|
|
return res, nil
|
|
}
|
|
return res, errno
|
|
}
|
|
|
|
// libc_select_trampoline_addr is the address of the
|
|
// `libc_select_trampoline` symbol, defined in `select_darwin.s`.
|
|
//
|
|
// We use this to invoke the syscall through syscall_syscall6 imported below.
|
|
var libc_select_trampoline_addr uintptr
|
|
|
|
// Imports the select symbol from libc as `libc_select`.
|
|
//
|
|
// Note: CGO mechanisms are used in darwin regardless of the CGO_ENABLED value
|
|
// or the "cgo" build flag. See /RATIONALE.md for why.
|
|
//go:cgo_import_dynamic libc_select select "/usr/lib/libSystem.B.dylib"
|