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f7e1f36418
Executing the command does the lookup if needed and returns the same error when not found, no need to do it separately.
67 lines
1.5 KiB
Go
67 lines
1.5 KiB
Go
//go:build darwin
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// +build darwin
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package common
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import (
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"context"
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"os"
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"os/exec"
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"strings"
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"unsafe"
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"golang.org/x/sys/unix"
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)
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func DoSysctrlWithContext(ctx context.Context, mib string) ([]string, error) {
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cmd := exec.CommandContext(ctx, "sysctl", "-n", mib)
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cmd.Env = getSysctrlEnv(os.Environ())
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out, err := cmd.Output()
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if err != nil {
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return []string{}, err
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}
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v := strings.Replace(string(out), "{ ", "", 1)
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v = strings.Replace(string(v), " }", "", 1)
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values := strings.Fields(string(v))
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return values, nil
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}
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func CallSyscall(mib []int32) ([]byte, uint64, error) {
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miblen := uint64(len(mib))
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// get required buffer size
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length := uint64(0)
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_, _, err := unix.Syscall6(
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202, // unix.SYS___SYSCTL https://github.com/golang/sys/blob/76b94024e4b621e672466e8db3d7f084e7ddcad2/unix/zsysnum_darwin_amd64.go#L146
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uintptr(unsafe.Pointer(&mib[0])),
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uintptr(miblen),
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0,
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uintptr(unsafe.Pointer(&length)),
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0,
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0)
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if err != 0 {
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var b []byte
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return b, length, err
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}
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if length == 0 {
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var b []byte
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return b, length, err
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}
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// get proc info itself
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buf := make([]byte, length)
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_, _, err = unix.Syscall6(
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202, // unix.SYS___SYSCTL https://github.com/golang/sys/blob/76b94024e4b621e672466e8db3d7f084e7ddcad2/unix/zsysnum_darwin_amd64.go#L146
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uintptr(unsafe.Pointer(&mib[0])),
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uintptr(miblen),
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uintptr(unsafe.Pointer(&buf[0])),
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uintptr(unsafe.Pointer(&length)),
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0,
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0)
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if err != 0 {
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return buf, length, err
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}
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return buf, length, nil
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}
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