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moby--moby/pkg/dmesg/dmesg_linux.go

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package dmesg // import "github.com/docker/docker/pkg/dmesg"
import (
"unsafe"
"golang.org/x/sys/unix"
)
// Dmesg returns last messages from the kernel log, up to size bytes
func Dmesg(size int) []byte {
t := uintptr(3) // SYSLOG_ACTION_READ_ALL
b := make([]byte, size)
amt, _, err := unix.Syscall(unix.SYS_SYSLOG, t, uintptr(unsafe.Pointer(&b[0])), uintptr(len(b)))
if err != 0 {
return []byte{}
}
return b[:amt]
}