33 lines
1.2 KiB
Go
33 lines
1.2 KiB
Go
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// Copyright (c) 2026 Petr Balvín <opensource@petrbalvin.org> (https://petrbalvin.org)
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// SPDX-License-Identifier: MIT
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//go:build freebsd
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package nfsfs
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import "syscall"
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// mknod creates a device node. It needs the superuser on FreeBSD, and a
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// failure of permission is reported as such rather than as an io error.
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// The kind is picked before the single call: a second mknod over an
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// existing node fails EEXIST and leaves the wrong kind behind.
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func mknod(path string, spec CreateSpec, perm uint32) error {
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dev := makedev(spec.Major, spec.Minor)
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kind := uint32(syscall.S_IFCHR)
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if spec.Kind == KindBlk {
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kind = syscall.S_IFBLK
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}
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return syscall.Mknod(path, perm|kind, dev)
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}
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// makedev assembles a device number the way the kernel expects it: the
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// encoding of makedev in sys/sys/types.h, where the low byte of the
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// major number sits at bits eight to fifteen with the rest of it above
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// the thirty-second bit, and the minor number keeps its low byte at bit
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// zero with the byte at bits eight to fifteen lifted above the
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// thirty-second bit.
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func makedev(major, minor uint32) uint64 {
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return uint64(major&0xffffff00)<<32 | uint64(major&0xff)<<8 |
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uint64(minor&0xff00)<<24 | uint64(minor&0xffff00ff)
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}
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