github.com/openflowlabs/storage@v1.12.13/pkg/dmesg/dmesg_linux.go (about)

     1  // +build linux
     2  
     3  package dmesg
     4  
     5  import (
     6  	"unsafe"
     7  
     8  	"golang.org/x/sys/unix"
     9  )
    10  
    11  // Dmesg returns last messages from the kernel log, up to size bytes
    12  func Dmesg(size int) []byte {
    13  	t := uintptr(3) // SYSLOG_ACTION_READ_ALL
    14  	b := make([]byte, size)
    15  	amt, _, err := unix.Syscall(unix.SYS_SYSLOG, t, uintptr(unsafe.Pointer(&b[0])), uintptr(len(b)))
    16  	if err != 0 {
    17  		return []byte{}
    18  	}
    19  	return b[:amt]
    20  }