/usr/share/gocode/src/github.com/influxdata/influxdb/tsdb/engine/tsm1/mmap_unix.go is in golang-github-influxdb-influxdb-dev 1.1.1+dfsg1-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 | // +build !windows,!plan9,!solaris
package tsm1
import (
"os"
"syscall"
"unsafe"
)
func mmap(f *os.File, offset int64, length int) ([]byte, error) {
mmap, err := syscall.Mmap(int(f.Fd()), 0, length, syscall.PROT_READ, syscall.MAP_SHARED)
if err != nil {
return nil, err
}
return mmap, nil
}
func munmap(b []byte) (err error) {
return syscall.Munmap(b)
}
// From: github.com/boltdb/bolt/bolt_unix.go
func madvise(b []byte, advice int) (err error) {
_, _, e1 := syscall.Syscall(syscall.SYS_MADVISE, uintptr(unsafe.Pointer(&b[0])), uintptr(len(b)), uintptr(advice))
if e1 != 0 {
err = e1
}
return
}
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