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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) 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 { func isGroupMember(gid int) bool {
groups, err := Getgroups() groups, err := Getgroups()
if err != nil { 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 // 64-bit file system and 32-bit uid calls
// (386 default is 32-bit file system and 16-bit uid). // (386 default is 32-bit file system and 16-bit uid).
//sys Dup2(oldfd int, newfd int) (err error) //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 Fchown(fd int, uid int, gid int) (err error) = SYS_FCHOWN32
//sys Fstat(fd int, stat *Stat_t) (err error) = SYS_FSTAT64 //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 //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 const _SYS_setgroups = SYS_SETGROUPS
//sys Dup2(oldfd int, newfd int) (err error) //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 Fchown(fd int, uid int, gid int) (err error)
//sys Fstat(fd int, stat *Stat_t) (err error) //sys Fstat(fd int, stat *Stat_t) (err error)
//sys Fstatfs(fd int, buf *Statfs_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 // 64-bit file system and 32-bit uid calls
// (16-bit uid calls are not always supported in newer kernels) // (16-bit uid calls are not always supported in newer kernels)
//sys Dup2(oldfd int, newfd int) (err error) //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 Fchown(fd int, uid int, gid int) (err error) = SYS_FCHOWN32
//sys Fstat(fd int, stat *Stat_t) (err error) = SYS_FSTAT64 //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 //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 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 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 Fchown(fd int, uid int, gid int) (err error)
//sys Fstat(fd int, stat *Stat_t) (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 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 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 Fchown(fd int, uid int, gid int) (err error)
//sys Fstatfs(fd int, buf *Statfs_t) (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 const _SYS_setgroups = SYS_SETGROUPS
//sys Dup2(oldfd int, newfd int) (err error) //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 Fchown(fd int, uid int, gid int) (err error)
//sys Fstatfs(fd int, buf *Statfs_t) (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 //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) 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) //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 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 fstatat(dirfd int, path string, stat *Stat_t, flags int) (err error) = SYS_FSTATAT64
//sys Ftruncate(fd int, length int64) (err error) = SYS_FTRUNCATE64 //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 const _SYS_setgroups = SYS_SETGROUPS
//sys Dup2(oldfd int, newfd int) (err error) //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 EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error)
//sys Fchown(fd int, uid int, gid int) (err error) //sys Fchown(fd int, uid int, gid int) (err error)
//sys Fstat(fd int, stat *Stat_t) (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 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 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 Fchown(fd int, uid int, gid int) (err error)
//sys Fstat(fd int, stat *Stat_t) (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 const _SYS_setgroups = SYS_SETGROUPS
//sys Dup2(oldfd int, newfd int) (err error) //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 EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error)
//sys Fchown(fd int, uid int, gid int) (err error) //sys Fchown(fd int, uid int, gid int) (err error)
//sys Fstat(fd int, stat *Stat_t) (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 // 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) { func Fchown(fd int, uid int, gid int) (err error) {
_, _, e1 := Syscall(SYS_FCHOWN32, uintptr(fd), uintptr(uid), uintptr(gid)) _, _, e1 := Syscall(SYS_FCHOWN32, uintptr(fd), uintptr(uid), uintptr(gid))
if e1 != 0 { 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 // 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) { func Fchown(fd int, uid int, gid int) (err error) {
_, _, e1 := Syscall(SYS_FCHOWN, uintptr(fd), uintptr(uid), uintptr(gid)) _, _, e1 := Syscall(SYS_FCHOWN, uintptr(fd), uintptr(uid), uintptr(gid))
if e1 != 0 { 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 // 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) { func Fchown(fd int, uid int, gid int) (err error) {
_, _, e1 := Syscall(SYS_FCHOWN32, uintptr(fd), uintptr(uid), uintptr(gid)) _, _, e1 := Syscall(SYS_FCHOWN32, uintptr(fd), uintptr(uid), uintptr(gid))
if e1 != 0 { 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 // 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) { func Fchown(fd int, uid int, gid int) (err error) {
_, _, e1 := Syscall(SYS_FCHOWN, uintptr(fd), uintptr(uid), uintptr(gid)) _, _, e1 := Syscall(SYS_FCHOWN, uintptr(fd), uintptr(uid), uintptr(gid))
if e1 != 0 { 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 // 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) { func Fchown(fd int, uid int, gid int) (err error) {
_, _, e1 := Syscall(SYS_FCHOWN, uintptr(fd), uintptr(uid), uintptr(gid)) _, _, e1 := Syscall(SYS_FCHOWN, uintptr(fd), uintptr(uid), uintptr(gid))
if e1 != 0 { 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 // 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) { func Fchown(fd int, uid int, gid int) (err error) {
_, _, e1 := Syscall(SYS_FCHOWN, uintptr(fd), uintptr(uid), uintptr(gid)) _, _, e1 := Syscall(SYS_FCHOWN, uintptr(fd), uintptr(uid), uintptr(gid))
if e1 != 0 { 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 // 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) { func Fchown(fd int, uid int, gid int) (err error) {
_, _, e1 := Syscall(SYS_FCHOWN, uintptr(fd), uintptr(uid), uintptr(gid)) _, _, e1 := Syscall(SYS_FCHOWN, uintptr(fd), uintptr(uid), uintptr(gid))
if e1 != 0 { 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 // 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) { func EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error) {
var _p0 unsafe.Pointer var _p0 unsafe.Pointer
if len(events) > 0 { 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 // 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) { func EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error) {
var _p0 unsafe.Pointer var _p0 unsafe.Pointer
if len(events) > 0 { 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 // 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) { func EpollWait(epfd int, events []EpollEvent, msec int) (n int, err error) {
var _p0 unsafe.Pointer var _p0 unsafe.Pointer
if len(events) > 0 { if len(events) > 0 {