unix: use fcntl(2) libc stub on OpenBSD

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.
golang · Nov 3, 2023 · 9c62104 · 9c62104
1 parent cb378ae
commit 9c62104
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Showing 16 changed files with 233 additions and 1 deletion.
diff --git a/unix/fcntl.go b/unix/fcntl.go
@@ -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
 

diff --git a/unix/syscall_openbsd.go b/unix/syscall_openbsd.go
@@ -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) {

diff --git a/unix/zsyscall_openbsd_386.go b/unix/zsyscall_openbsd_386.go
diff --git a/unix/zsyscall_openbsd_386.s b/unix/zsyscall_openbsd_386.s
@@ -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

diff --git a/unix/zsyscall_openbsd_amd64.go b/unix/zsyscall_openbsd_amd64.go
diff --git a/unix/zsyscall_openbsd_amd64.s b/unix/zsyscall_openbsd_amd64.s
@@ -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

diff --git a/unix/zsyscall_openbsd_arm.go b/unix/zsyscall_openbsd_arm.go
diff --git a/unix/zsyscall_openbsd_arm.s b/unix/zsyscall_openbsd_arm.s
@@ -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

diff --git a/unix/zsyscall_openbsd_arm64.go b/unix/zsyscall_openbsd_arm64.go
diff --git a/unix/zsyscall_openbsd_arm64.s b/unix/zsyscall_openbsd_arm64.s
@@ -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

diff --git a/unix/zsyscall_openbsd_mips64.go b/unix/zsyscall_openbsd_mips64.go
diff --git a/unix/zsyscall_openbsd_mips64.s b/unix/zsyscall_openbsd_mips64.s
@@ -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

diff --git a/unix/zsyscall_openbsd_ppc64.go b/unix/zsyscall_openbsd_ppc64.go
diff --git a/unix/zsyscall_openbsd_ppc64.s b/unix/zsyscall_openbsd_ppc64.s
@@ -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

diff --git a/unix/zsyscall_openbsd_riscv64.go b/unix/zsyscall_openbsd_riscv64.go
diff --git a/unix/zsyscall_openbsd_riscv64.s b/unix/zsyscall_openbsd_riscv64.s
@@ -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