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internal/runtime/syscall: add basic file system calls 

Change-Id: I6a6a636c5e119165dc1018d1fc0354f5b6929656
Reviewed-on: https://go-review.googlesource.com/c/go/+/670496
Auto-Submit: Michael Pratt <mpratt@google.com>
Reviewed-by: Michael Knyszek <mknyszek@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
This commit is contained in:
Michael Pratt 2025-05-05 15:51:05 -04:00 committed by Gopher Robot
parent 195e64232d
commit 2a29cddec3
12 changed files with 112 additions and 0 deletions
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7
src/internal/runtime/syscall/defs_linux.go
View File

@ -5,6 +5,10 @@
package syscall
const (
AT_FDCWD = -0x64
ENOENT = 0x2
EPOLLIN = 0x1
EPOLLOUT = 0x4
EPOLLERR = 0x8
@ -17,6 +21,9 @@ const (
EPOLL_CTL_MOD = 0x3
EFD_CLOEXEC = 0x80000
O_RDONLY = 0x0
O_CLOEXEC = 0x80000
PR_SET_VMA = 0x53564d41
PR_SET_VMA_ANON_NAME = 0
)

6
src/internal/runtime/syscall/defs_linux_386.go
View File

@ -5,6 +5,7 @@
package syscall
const (
SYS_CLOSE = 6
SYS_FCNTL = 55
SYS_MPROTECT = 125
SYS_PRCTL = 172
@ -13,8 +14,13 @@ const (
SYS_EPOLL_CREATE1 = 329
SYS_EPOLL_PWAIT2 = 441
SYS_EVENTFD2 = 328
SYS_OPENAT = 295
SYS_PREAD64 = 180
SYS_READ = 3
EFD_NONBLOCK = 0x800
O_LARGEFILE = 0x8000
)
type EpollEvent struct {

6
src/internal/runtime/syscall/defs_linux_amd64.go
View File

@ -5,6 +5,7 @@
package syscall
const (
SYS_CLOSE = 3
SYS_MPROTECT = 10
SYS_FCNTL = 72
SYS_PRCTL = 157
@ -13,8 +14,13 @@ const (
SYS_EPOLL_CREATE1 = 291
SYS_EPOLL_PWAIT2 = 441
SYS_EVENTFD2 = 290
SYS_OPENAT = 257
SYS_PREAD64 = 17
SYS_READ = 0
EFD_NONBLOCK = 0x800
O_LARGEFILE = 0x0
)
type EpollEvent struct {

6
src/internal/runtime/syscall/defs_linux_arm.go
View File

@ -5,6 +5,7 @@
package syscall
const (
SYS_CLOSE = 6
SYS_FCNTL = 55
SYS_MPROTECT = 125
SYS_PRCTL = 172
@ -13,8 +14,13 @@ const (
SYS_EPOLL_CREATE1 = 357
SYS_EPOLL_PWAIT2 = 441
SYS_EVENTFD2 = 356
SYS_OPENAT = 322
SYS_PREAD64 = 180
SYS_READ = 3
EFD_NONBLOCK = 0x800
O_LARGEFILE = 0x20000
)
type EpollEvent struct {

6
src/internal/runtime/syscall/defs_linux_arm64.go
View File

@ -5,6 +5,7 @@
package syscall
const (
SYS_CLOSE = 57
SYS_EPOLL_CREATE1 = 20
SYS_EPOLL_CTL = 21
SYS_EPOLL_PWAIT = 22
@ -13,8 +14,13 @@ const (
SYS_MPROTECT = 226
SYS_EPOLL_PWAIT2 = 441
SYS_EVENTFD2 = 19
SYS_OPENAT = 56
SYS_PREAD64 = 67
SYS_READ = 63
EFD_NONBLOCK = 0x800
O_LARGEFILE = 0x0
)
type EpollEvent struct {

6
src/internal/runtime/syscall/defs_linux_loong64.go
View File

@ -5,6 +5,7 @@
package syscall
const (
SYS_CLOSE = 57
SYS_EPOLL_CREATE1 = 20
SYS_EPOLL_CTL = 21
SYS_EPOLL_PWAIT = 22
@ -13,8 +14,13 @@ const (
SYS_MPROTECT = 226
SYS_EPOLL_PWAIT2 = 441
SYS_EVENTFD2 = 19
SYS_OPENAT = 56
SYS_PREAD64 = 67
SYS_READ = 63
EFD_NONBLOCK = 0x800
O_LARGEFILE = 0x0
)
type EpollEvent struct {

6
src/internal/runtime/syscall/defs_linux_mips64x.go
View File

@ -7,6 +7,7 @@
package syscall
const (
SYS_CLOSE = 5003
SYS_MPROTECT = 5010
SYS_FCNTL = 5070
SYS_PRCTL = 5153
@ -15,8 +16,13 @@ const (
SYS_EPOLL_CREATE1 = 5285
SYS_EPOLL_PWAIT2 = 5441
SYS_EVENTFD2 = 5284
SYS_OPENAT = 5247
SYS_PREAD64 = 5016
SYS_READ = 5000
EFD_NONBLOCK = 0x80
O_LARGEFILE = 0x0
)
type EpollEvent struct {

6
src/internal/runtime/syscall/defs_linux_mipsx.go
View File

@ -7,6 +7,7 @@
package syscall
const (
SYS_CLOSE = 4006
SYS_FCNTL = 4055
SYS_MPROTECT = 4125
SYS_PRCTL = 4192
@ -15,8 +16,13 @@ const (
SYS_EPOLL_CREATE1 = 4326
SYS_EPOLL_PWAIT2 = 4441
SYS_EVENTFD2 = 4325
SYS_OPENAT = 4288
SYS_PREAD64 = 4200
SYS_READ = 4003
EFD_NONBLOCK = 0x80
O_LARGEFILE = 0x2000
)
type EpollEvent struct {

6
src/internal/runtime/syscall/defs_linux_ppc64x.go
View File

@ -7,6 +7,7 @@
package syscall
const (
SYS_CLOSE = 6
SYS_FCNTL = 55
SYS_MPROTECT = 125
SYS_PRCTL = 171
@ -15,8 +16,13 @@ const (
SYS_EPOLL_CREATE1 = 315
SYS_EPOLL_PWAIT2 = 441
SYS_EVENTFD2 = 314
SYS_OPENAT = 286
SYS_PREAD64 = 179
SYS_READ = 3
EFD_NONBLOCK = 0x800
O_LARGEFILE = 0x0
)
type EpollEvent struct {

6
src/internal/runtime/syscall/defs_linux_riscv64.go
View File

@ -5,6 +5,7 @@
package syscall
const (
SYS_CLOSE = 57
SYS_EPOLL_CREATE1 = 20
SYS_EPOLL_CTL = 21
SYS_EPOLL_PWAIT = 22
@ -13,8 +14,13 @@ const (
SYS_MPROTECT = 226
SYS_EPOLL_PWAIT2 = 441
SYS_EVENTFD2 = 19
SYS_OPENAT = 56
SYS_PREAD64 = 67
SYS_READ = 63
EFD_NONBLOCK = 0x800
O_LARGEFILE = 0x0
)
type EpollEvent struct {

6
src/internal/runtime/syscall/defs_linux_s390x.go
View File

@ -5,6 +5,7 @@
package syscall
const (
SYS_CLOSE = 6
SYS_FCNTL = 55
SYS_MPROTECT = 125
SYS_PRCTL = 172
@ -13,8 +14,13 @@ const (
SYS_EPOLL_CREATE1 = 327
SYS_EPOLL_PWAIT2 = 441
SYS_EVENTFD2 = 323
SYS_OPENAT = 288
SYS_PREAD64 = 180
SYS_READ = 3
EFD_NONBLOCK = 0x800
O_LARGEFILE = 0x0
)
type EpollEvent struct {

45
src/internal/runtime/syscall/syscall_linux.go
View File

@ -6,6 +6,7 @@
package syscall
import (
"internal/goarch"
"unsafe"
)
@ -42,3 +43,47 @@ 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
}