// 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 (
"internal/goarch"
"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)
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 Eventfd(initval, flags int32) (fd int32, errno uintptr) {
r1, _, e := Syscall6(SYS_EVENTFD2, uintptr(initval), uintptr(flags), 0, 0, 0, 0)
return int32(r1), e
}
func Open(path *byte, mode int, perm uint32) (fd int, errno uintptr) {
// Use SYS_OPENAT to match the syscall package.
dfd := AT_FDCWD
r1, _, e := Syscall6(SYS_OPENAT, uintptr(dfd), uintptr(unsafe.Pointer(path)), uintptr(mode|O_LARGEFILE), uintptr(perm), 0, 0)
return int(r1), e
}
func Close(fd int) (errno uintptr) {
_, _, e := Syscall6(SYS_CLOSE, uintptr(fd), 0, 0, 0, 0, 0)
return e
}
func Read(fd int, p []byte) (n int, errno uintptr) {
var p0 unsafe.Pointer
if len(p) > 0 {
p0 = unsafe.Pointer(&p[0])
} else {
p0 = unsafe.Pointer(&_zero)
}
r1, _, e := Syscall6(SYS_READ, uintptr(fd), uintptr(p0), uintptr(len(p)), 0, 0, 0)
return int(r1), e
}
func Pread(fd int, p []byte, offset int64) (n int, errno uintptr) {
var p0 unsafe.Pointer
if len(p) > 0 {
p0 = unsafe.Pointer(&p[0])
} else {
p0 = unsafe.Pointer(&_zero)
}
var r1, e uintptr
switch goarch.GOARCH {
case "386":
r1, _, e = Syscall6(SYS_PREAD64, uintptr(fd), uintptr(p0), uintptr(len(p)), uintptr(offset), uintptr(offset>>32), 0)
case "arm", "mipsle":
r1, _, e = Syscall6(SYS_PREAD64, uintptr(fd), uintptr(p0), uintptr(len(p)), 0, uintptr(offset), uintptr(offset>>32))
case "mips":
r1, _, e = Syscall6(SYS_PREAD64, uintptr(fd), uintptr(p0), uintptr(len(p)), 0, uintptr(offset>>32), uintptr(offset))
default:
r1, _, e = Syscall6(SYS_PREAD64, uintptr(fd), uintptr(p0), uintptr(len(p)), uintptr(offset), 0, 0)
}
return int(r1), e
}
