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unix: use fcntl(2) libc stub on OpenBSD
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Future OpenBSD releases will remove the syscall(2) interface.
This converts the Fcntl functions to use fcntl(2) from libc,
rather than indirectly through syscall(2).

Updates golang/go#63900.
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jrick committed Nov 3, 2023
1 parent cb378ae commit 9c62104
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Showing 16 changed files with 233 additions and 1 deletion.
2 changes: 1 addition & 1 deletion unix/fcntl.go
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Expand Up @@ -2,7 +2,7 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build dragonfly || freebsd || linux || netbsd || openbsd
//go:build dragonfly || freebsd || linux || netbsd

package unix

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14 changes: 14 additions & 0 deletions unix/syscall_openbsd.go
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Expand Up @@ -166,6 +166,20 @@ func Getresgid() (rgid, egid, sgid int) {

//sys sysctl(mib []_C_int, old *byte, oldlen *uintptr, new *byte, newlen uintptr) (err error) = SYS___SYSCTL

//sys fcntl(fd int, cmd int, arg int) (n int, err error)
//sys fcntlPtr(fd int, cmd int, arg unsafe.Pointer) (n int, err error) = SYS_FCNTL

// FcntlInt performs a fcntl syscall on fd with the provided command and argument.
func FcntlInt(fd uintptr, cmd, arg int) (int, error) {
return fcntl(int(fd), cmd, arg)
}

// FcntlFlock performs a fcntl syscall for the F_GETLK, F_SETLK or F_SETLKW command.
func FcntlFlock(fd uintptr, cmd int, lk *Flock_t) error {
_, err := fcntlPtr(int(fd), cmd, unsafe.Pointer(lk))
return err
}

//sys ppoll(fds *PollFd, nfds int, timeout *Timespec, sigmask *Sigset_t) (n int, err error)

func Ppoll(fds []PollFd, timeout *Timespec, sigmask *Sigset_t) (n int, err error) {
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26 changes: 26 additions & 0 deletions unix/zsyscall_openbsd_386.go

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5 changes: 5 additions & 0 deletions unix/zsyscall_openbsd_386.s
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Expand Up @@ -178,6 +178,11 @@ TEXT libc_sysctl_trampoline<>(SB),NOSPLIT,$0-0
GLOBL ·libc_sysctl_trampoline_addr(SB), RODATA, $4
DATA ·libc_sysctl_trampoline_addr(SB)/4, $libc_sysctl_trampoline<>(SB)

TEXT libc_fcntl_trampoline<>(SB),NOSPLIT,$0-0
JMP libc_fcntl(SB)
GLOBL ·libc_fcntl_trampoline_addr(SB), RODATA, $4
DATA ·libc_fcntl_trampoline_addr(SB)/4, $libc_fcntl_trampoline<>(SB)

TEXT libc_ppoll_trampoline<>(SB),NOSPLIT,$0-0
JMP libc_ppoll(SB)
GLOBL ·libc_ppoll_trampoline_addr(SB), RODATA, $4
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26 changes: 26 additions & 0 deletions unix/zsyscall_openbsd_amd64.go

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5 changes: 5 additions & 0 deletions unix/zsyscall_openbsd_amd64.s
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Expand Up @@ -178,6 +178,11 @@ TEXT libc_sysctl_trampoline<>(SB),NOSPLIT,$0-0
GLOBL ·libc_sysctl_trampoline_addr(SB), RODATA, $8
DATA ·libc_sysctl_trampoline_addr(SB)/8, $libc_sysctl_trampoline<>(SB)

TEXT libc_fcntl_trampoline<>(SB),NOSPLIT,$0-0
JMP libc_fcntl(SB)
GLOBL ·libc_fcntl_trampoline_addr(SB), RODATA, $8
DATA ·libc_fcntl_trampoline_addr(SB)/8, $libc_fcntl_trampoline<>(SB)

TEXT libc_ppoll_trampoline<>(SB),NOSPLIT,$0-0
JMP libc_ppoll(SB)
GLOBL ·libc_ppoll_trampoline_addr(SB), RODATA, $8
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26 changes: 26 additions & 0 deletions unix/zsyscall_openbsd_arm.go

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5 changes: 5 additions & 0 deletions unix/zsyscall_openbsd_arm.s
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Expand Up @@ -178,6 +178,11 @@ TEXT libc_sysctl_trampoline<>(SB),NOSPLIT,$0-0
GLOBL ·libc_sysctl_trampoline_addr(SB), RODATA, $4
DATA ·libc_sysctl_trampoline_addr(SB)/4, $libc_sysctl_trampoline<>(SB)

TEXT libc_fcntl_trampoline<>(SB),NOSPLIT,$0-0
JMP libc_fcntl(SB)
GLOBL ·libc_fcntl_trampoline_addr(SB), RODATA, $4
DATA ·libc_fcntl_trampoline_addr(SB)/4, $libc_fcntl_trampoline<>(SB)

TEXT libc_ppoll_trampoline<>(SB),NOSPLIT,$0-0
JMP libc_ppoll(SB)
GLOBL ·libc_ppoll_trampoline_addr(SB), RODATA, $4
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26 changes: 26 additions & 0 deletions unix/zsyscall_openbsd_arm64.go

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5 changes: 5 additions & 0 deletions unix/zsyscall_openbsd_arm64.s
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Expand Up @@ -178,6 +178,11 @@ TEXT libc_sysctl_trampoline<>(SB),NOSPLIT,$0-0
GLOBL ·libc_sysctl_trampoline_addr(SB), RODATA, $8
DATA ·libc_sysctl_trampoline_addr(SB)/8, $libc_sysctl_trampoline<>(SB)

TEXT libc_fcntl_trampoline<>(SB),NOSPLIT,$0-0
JMP libc_fcntl(SB)
GLOBL ·libc_fcntl_trampoline_addr(SB), RODATA, $8
DATA ·libc_fcntl_trampoline_addr(SB)/8, $libc_fcntl_trampoline<>(SB)

TEXT libc_ppoll_trampoline<>(SB),NOSPLIT,$0-0
JMP libc_ppoll(SB)
GLOBL ·libc_ppoll_trampoline_addr(SB), RODATA, $8
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26 changes: 26 additions & 0 deletions unix/zsyscall_openbsd_mips64.go

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5 changes: 5 additions & 0 deletions unix/zsyscall_openbsd_mips64.s
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Expand Up @@ -178,6 +178,11 @@ TEXT libc_sysctl_trampoline<>(SB),NOSPLIT,$0-0
GLOBL ·libc_sysctl_trampoline_addr(SB), RODATA, $8
DATA ·libc_sysctl_trampoline_addr(SB)/8, $libc_sysctl_trampoline<>(SB)

TEXT libc_fcntl_trampoline<>(SB),NOSPLIT,$0-0
JMP libc_fcntl(SB)
GLOBL ·libc_fcntl_trampoline_addr(SB), RODATA, $8
DATA ·libc_fcntl_trampoline_addr(SB)/8, $libc_fcntl_trampoline<>(SB)

TEXT libc_ppoll_trampoline<>(SB),NOSPLIT,$0-0
JMP libc_ppoll(SB)
GLOBL ·libc_ppoll_trampoline_addr(SB), RODATA, $8
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26 changes: 26 additions & 0 deletions unix/zsyscall_openbsd_ppc64.go

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6 changes: 6 additions & 0 deletions unix/zsyscall_openbsd_ppc64.s
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Expand Up @@ -213,6 +213,12 @@ TEXT libc_sysctl_trampoline<>(SB),NOSPLIT,$0-0
GLOBL ·libc_sysctl_trampoline_addr(SB), RODATA, $8
DATA ·libc_sysctl_trampoline_addr(SB)/8, $libc_sysctl_trampoline<>(SB)

TEXT libc_fcntl_trampoline<>(SB),NOSPLIT,$0-0
CALL libc_fcntl(SB)
RET
GLOBL ·libc_fcntl_trampoline_addr(SB), RODATA, $8
DATA ·libc_fcntl_trampoline_addr(SB)/8, $libc_fcntl_trampoline<>(SB)

TEXT libc_ppoll_trampoline<>(SB),NOSPLIT,$0-0
CALL libc_ppoll(SB)
RET
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26 changes: 26 additions & 0 deletions unix/zsyscall_openbsd_riscv64.go

Some generated files are not rendered by default. Learn more about how customized files appear on GitHub.

5 changes: 5 additions & 0 deletions unix/zsyscall_openbsd_riscv64.s
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Expand Up @@ -178,6 +178,11 @@ TEXT libc_sysctl_trampoline<>(SB),NOSPLIT,$0-0
GLOBL ·libc_sysctl_trampoline_addr(SB), RODATA, $8
DATA ·libc_sysctl_trampoline_addr(SB)/8, $libc_sysctl_trampoline<>(SB)

TEXT libc_fcntl_trampoline<>(SB),NOSPLIT,$0-0
JMP libc_fcntl(SB)
GLOBL ·libc_fcntl_trampoline_addr(SB), RODATA, $8
DATA ·libc_fcntl_trampoline_addr(SB)/8, $libc_fcntl_trampoline<>(SB)

TEXT libc_ppoll_trampoline<>(SB),NOSPLIT,$0-0
JMP libc_ppoll(SB)
GLOBL ·libc_ppoll_trampoline_addr(SB), RODATA, $8
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