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// Copyright 2022 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.
// Package syscall provides the syscall primitives required for the runtime.
package syscall
import (
"unsafe"
)
// TODO(https://go.dev/issue/51087): This package is incomplete and currently
// only contains very minimal support for Linux.
// Syscall6 calls system call number 'num' with arguments a1-6.
func Syscall6(num, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, errno uintptr)
// syscall_RawSyscall6 is a push linkname to export Syscall6 as
// syscall.RawSyscall6.
//
// //go:uintptrkeepalive because the uintptr argument may be converted pointers
// that need to be kept alive in the caller (this is implied for Syscall6 since
// it has no body).
//
// //go:nosplit because stack copying does not account for uintptrkeepalive, so
// the stack must not grow. Stack copying cannot blindly assume that all
// uintptr arguments are pointers, because some values may look like pointers,
// but not really be pointers, and adjusting their value would break the call.
//
// This is a separate wrapper because we can't export one function as two
// names. The assembly implementations name themselves Syscall6 would not be
// affected by a linkname.
//
//go:uintptrkeepalive
//go:nosplit
//go:linkname syscall_RawSyscall6 syscall.RawSyscall6
func syscall_RawSyscall6(num, a1, a2, a3, a4, a5, a6 uintptr) (r1, r2, errno uintptr) {
return Syscall6(num, a1, a2, a3, a4, a5, a6)
}
func EpollCreate1(flags int32) (fd int32, errno uintptr) {
r1, _, e := Syscall6(SYS_EPOLL_CREATE1, uintptr(flags), 0, 0, 0, 0, 0)
return int32(r1), e
}
var _zero uintptr
func EpollWait(epfd int32, events []EpollEvent, maxev, waitms int32) (n int32, errno uintptr) {
var ev unsafe.Pointer
if len(events) > 0 {
ev = unsafe.Pointer(&events[0])
} else {
ev = unsafe.Pointer(&_zero)
}
r1, _, e := Syscall6(SYS_EPOLL_PWAIT, uintptr(epfd), uintptr(ev), uintptr(maxev), uintptr(waitms), 0, 0)
return int32(r1), e
}
func EpollCtl(epfd, op, fd int32, event *EpollEvent) (errno uintptr) {
_, _, e := Syscall6(SYS_EPOLL_CTL, uintptr(epfd), uintptr(op), uintptr(fd), uintptr(unsafe.Pointer(event)), 0, 0)
return e
}
func CloseOnExec(fd int32) {
Syscall6(SYS_FCNTL, uintptr(fd), F_SETFD, FD_CLOEXEC, 0, 0, 0)
}
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