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syscall: implement EpollCreate using EpollCreate1 on all linux platforms

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Most newer architectures (e.g. arm64, riscv64, loong64) don't provide the
epoll_create syscall. Some systems (e.g. Android) block it even if it
were available. In the kernel, the epoll_create syscall is implemented
[1] the same way EpollCreate is implemented in this package for
platforms without the epoll_create syscall. The epoll_create1 syscall is
available since Linux kernel 2.6.27 and the minimum required kernel
version is 2.6.32 since Go 1.18 (see #45964). Thus, avoid the separate
wrapper and consistently implement EpollCreate using EpollCreate1.

[1] https://elixir.bootlin.com/linux/v5.15-rc1/source/fs/eventpoll.c#L2006

The same change was already done in CL 349809 for golang.org/x/sys/unix.

For #45964

Change-Id: I5463b208aa7ae236fa2c175d6d3ec6568f1840b0
Reviewed-on: https://go-review.googlesource.com/c/go/+/411594
Reviewed-by: Bryan Mills <bcmills@google.com>
Auto-Submit: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
This commit is contained in:
Tobias Klauser 2022-08-09 10:20:22 +02:00 committed by Gopher Robot
parent 741ab7e819
commit 021fd86ce1
21 changed files with 7 additions and 138 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
src/syscall/syscall_linux.go
View File

@ -115,6 +115,13 @@ func Creat(path string, mode uint32) (fd int, err error) {
return Open(path, O_CREAT|O_WRONLY|O_TRUNC, mode)
}
func EpollCreate(size int) (fd int, err error) {
if size <= 0 {
return -1, EINVAL
}
return EpollCreate1(0)
}
func isGroupMember(gid int) bool {
groups, err := Getgroups()
if err != nil {

1
src/syscall/syscall_linux_386.go
View File

@ -19,7 +19,6 @@ func setTimeval(sec, usec int64) Timeval {
// 64-bit file system and 32-bit uid calls
// (386 default is 32-bit file system and 16-bit uid).
//sys Dup2(oldfd int, newfd int) (err error)
//sysnb EpollCreate(size int) (fd int, err error)
//sys Fchown(fd int, uid int, gid int) (err error) = SYS_FCHOWN32
//sys Fstat(fd int, stat *Stat_t) (err error) = SYS_FSTAT64
//sys fstatat(dirfd int, path string, stat *Stat_t, flags int) (err error) = SYS_FSTATAT64

1
src/syscall/syscall_linux_amd64.go
View File

@ -7,7 +7,6 @@ package syscall
const _SYS_setgroups = SYS_SETGROUPS
//sys Dup2(oldfd int, newfd int) (err error)
//sysnb EpollCreate(size int) (fd int, err error)
//sys Fchown(fd int, uid int, gid int) (err error)
//sys Fstat(fd int, stat *Stat_t) (err error)
//sys Fstatfs(fd int, buf *Statfs_t) (err error)

1
src/syscall/syscall_linux_arm.go
View File

@ -46,7 +46,6 @@ func Seek(fd int, offset int64, whence int) (newoffset int64, err error) {
// 64-bit file system and 32-bit uid calls
// (16-bit uid calls are not always supported in newer kernels)
//sys Dup2(oldfd int, newfd int) (err error)
//sysnb EpollCreate(size int) (fd int, err error)
//sys Fchown(fd int, uid int, gid int) (err error) = SYS_FCHOWN32
//sys Fstat(fd int, stat *Stat_t) (err error) = SYS_FSTAT64
//sys fstatat(dirfd int, path string, stat *Stat_t, flags int) (err error) = SYS_FSTATAT64

7
src/syscall/syscall_linux_arm64.go
View File

@ -8,13 +8,6 @@ import "unsafe"
const _SYS_setgroups = SYS_SETGROUPS
func EpollCreate(size int) (fd int, err error) {
if size <= 0 {
return -1, EINVAL
}
return EpollCreate1(0)
}
//sys EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error) = SYS_EPOLL_PWAIT
//sys Fchown(fd int, uid int, gid int) (err error)
//sys Fstat(fd int, stat *Stat_t) (err error)

7
src/syscall/syscall_linux_loong64.go
View File

@ -8,13 +8,6 @@ import "unsafe"
const _SYS_setgroups = SYS_SETGROUPS
func EpollCreate(size int) (fd int, err error) {
if size <= 0 {
return -1, EINVAL
}
return EpollCreate1(0)
}
//sys EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error) = SYS_EPOLL_PWAIT
//sys Fchown(fd int, uid int, gid int) (err error)
//sys Fstatfs(fd int, buf *Statfs_t) (err error)

1
src/syscall/syscall_linux_mips64x.go
View File

@ -9,7 +9,6 @@ package syscall
const _SYS_setgroups = SYS_SETGROUPS
//sys Dup2(oldfd int, newfd int) (err error)
//sysnb EpollCreate(size int) (fd int, err error)
//sys Fchown(fd int, uid int, gid int) (err error)
//sys Fstatfs(fd int, buf *Statfs_t) (err error)
//sys fstatat(dirfd int, path string, stat *Stat_t, flags int) (err error) = SYS_NEWFSTATAT

1
src/syscall/syscall_linux_mipsx.go
View File

@ -13,7 +13,6 @@ const _SYS_setgroups = SYS_SETGROUPS
func Syscall9(trap, a1, a2, a3, a4, a5, a6, a7, a8, a9 uintptr) (r1, r2 uintptr, err Errno)
//sys Dup2(oldfd int, newfd int) (err error)
//sysnb EpollCreate(size int) (fd int, err error)
//sys Fchown(fd int, uid int, gid int) (err error)
//sys fstatat(dirfd int, path string, stat *Stat_t, flags int) (err error) = SYS_FSTATAT64
//sys Ftruncate(fd int, length int64) (err error) = SYS_FTRUNCATE64

1
src/syscall/syscall_linux_ppc64x.go
View File

@ -9,7 +9,6 @@ package syscall
const _SYS_setgroups = SYS_SETGROUPS
//sys Dup2(oldfd int, newfd int) (err error)
//sysnb EpollCreate(size int) (fd int, err error)
//sys EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error)
//sys Fchown(fd int, uid int, gid int) (err error)
//sys Fstat(fd int, stat *Stat_t) (err error)

7
src/syscall/syscall_linux_riscv64.go
View File

@ -8,13 +8,6 @@ import "unsafe"
const _SYS_setgroups = SYS_SETGROUPS
func EpollCreate(size int) (fd int, err error) {
if size <= 0 {
return -1, EINVAL
}
return EpollCreate1(0)
}
//sys EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error) = SYS_EPOLL_PWAIT
//sys Fchown(fd int, uid int, gid int) (err error)
//sys Fstat(fd int, stat *Stat_t) (err error)

1
src/syscall/syscall_linux_s390x.go
View File

@ -9,7 +9,6 @@ import "unsafe"
const _SYS_setgroups = SYS_SETGROUPS
//sys Dup2(oldfd int, newfd int) (err error)
//sysnb EpollCreate(size int) (fd int, err error)
//sys EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error)
//sys Fchown(fd int, uid int, gid int) (err error)
//sys Fstat(fd int, stat *Stat_t) (err error)

11
src/syscall/zsyscall_linux_386.go
View File

@ -1067,17 +1067,6 @@ func Dup2(oldfd int, newfd int) (err error) {
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func EpollCreate(size int) (fd int, err error) {
r0, _, e1 := RawSyscall(SYS_EPOLL_CREATE, uintptr(size), 0, 0)
fd = int(r0)
if e1 != 0 {
err = errnoErr(e1)
}
return
}
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func Fchown(fd int, uid int, gid int) (err error) {
_, _, e1 := Syscall(SYS_FCHOWN32, uintptr(fd), uintptr(uid), uintptr(gid))
if e1 != 0 {

11
src/syscall/zsyscall_linux_amd64.go
View File

@ -1067,17 +1067,6 @@ func Dup2(oldfd int, newfd int) (err error) {
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func EpollCreate(size int) (fd int, err error) {
r0, _, e1 := RawSyscall(SYS_EPOLL_CREATE, uintptr(size), 0, 0)
fd = int(r0)
if e1 != 0 {
err = errnoErr(e1)
}
return
}
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func Fchown(fd int, uid int, gid int) (err error) {
_, _, e1 := Syscall(SYS_FCHOWN, uintptr(fd), uintptr(uid), uintptr(gid))
if e1 != 0 {

11
src/syscall/zsyscall_linux_arm.go
View File

@ -1225,17 +1225,6 @@ func Dup2(oldfd int, newfd int) (err error) {
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func EpollCreate(size int) (fd int, err error) {
r0, _, e1 := RawSyscall(SYS_EPOLL_CREATE, uintptr(size), 0, 0)
fd = int(r0)
if e1 != 0 {
err = errnoErr(e1)
}
return
}
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func Fchown(fd int, uid int, gid int) (err error) {
_, _, e1 := Syscall(SYS_FCHOWN32, uintptr(fd), uintptr(uid), uintptr(gid))
if e1 != 0 {

11
src/syscall/zsyscall_linux_mips.go
View File

@ -1067,17 +1067,6 @@ func Dup2(oldfd int, newfd int) (err error) {
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func EpollCreate(size int) (fd int, err error) {
r0, _, e1 := RawSyscall(SYS_EPOLL_CREATE, uintptr(size), 0, 0)
fd = int(r0)
if e1 != 0 {
err = errnoErr(e1)
}
return
}
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func Fchown(fd int, uid int, gid int) (err error) {
_, _, e1 := Syscall(SYS_FCHOWN, uintptr(fd), uintptr(uid), uintptr(gid))
if e1 != 0 {

11
src/syscall/zsyscall_linux_mips64.go
View File

@ -1067,17 +1067,6 @@ func Dup2(oldfd int, newfd int) (err error) {
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func EpollCreate(size int) (fd int, err error) {
r0, _, e1 := RawSyscall(SYS_EPOLL_CREATE, uintptr(size), 0, 0)
fd = int(r0)
if e1 != 0 {
err = errnoErr(e1)
}
return
}
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func Fchown(fd int, uid int, gid int) (err error) {
_, _, e1 := Syscall(SYS_FCHOWN, uintptr(fd), uintptr(uid), uintptr(gid))
if e1 != 0 {

11
src/syscall/zsyscall_linux_mips64le.go
View File

@ -1067,17 +1067,6 @@ func Dup2(oldfd int, newfd int) (err error) {
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func EpollCreate(size int) (fd int, err error) {
r0, _, e1 := RawSyscall(SYS_EPOLL_CREATE, uintptr(size), 0, 0)
fd = int(r0)
if e1 != 0 {
err = errnoErr(e1)
}
return
}
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func Fchown(fd int, uid int, gid int) (err error) {
_, _, e1 := Syscall(SYS_FCHOWN, uintptr(fd), uintptr(uid), uintptr(gid))
if e1 != 0 {

11
src/syscall/zsyscall_linux_mipsle.go
View File

@ -1067,17 +1067,6 @@ func Dup2(oldfd int, newfd int) (err error) {
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func EpollCreate(size int) (fd int, err error) {
r0, _, e1 := RawSyscall(SYS_EPOLL_CREATE, uintptr(size), 0, 0)
fd = int(r0)
if e1 != 0 {
err = errnoErr(e1)
}
return
}
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func Fchown(fd int, uid int, gid int) (err error) {
_, _, e1 := Syscall(SYS_FCHOWN, uintptr(fd), uintptr(uid), uintptr(gid))
if e1 != 0 {

11
src/syscall/zsyscall_linux_ppc64.go
View File

@ -1067,17 +1067,6 @@ func Dup2(oldfd int, newfd int) (err error) {
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func EpollCreate(size int) (fd int, err error) {
r0, _, e1 := RawSyscall(SYS_EPOLL_CREATE, uintptr(size), 0, 0)
fd = int(r0)
if e1 != 0 {
err = errnoErr(e1)
}
return
}
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error) {
var _p0 unsafe.Pointer
if len(events) > 0 {

11
src/syscall/zsyscall_linux_ppc64le.go
View File

@ -1067,17 +1067,6 @@ func Dup2(oldfd int, newfd int) (err error) {
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func EpollCreate(size int) (fd int, err error) {
r0, _, e1 := RawSyscall(SYS_EPOLL_CREATE, uintptr(size), 0, 0)
fd = int(r0)
if e1 != 0 {
err = errnoErr(e1)
}
return
}
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error) {
var _p0 unsafe.Pointer
if len(events) > 0 {

11
src/syscall/zsyscall_linux_s390x.go
View File

@ -1067,17 +1067,6 @@ func Dup2(oldfd int, newfd int) (err error) {
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func EpollCreate(size int) (fd int, err error) {
r0, _, e1 := RawSyscall(SYS_EPOLL_CREATE, uintptr(size), 0, 0)
fd = int(r0)
if e1 != 0 {
err = errnoErr(e1)
}
return
}
// THIS FILE IS GENERATED BY THE COMMAND AT THE TOP; DO NOT EDIT
func EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error) {
var _p0 unsafe.Pointer
if len(events) > 0 {