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tempfile.go
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/
tempfile.go
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package cat
import (
"encoding/binary"
"errors"
"io"
. "os"
//"syscall"
"time"
)
func cat_new_mids() (floor uint64, ceiling uint64, tsh uint64, err error) {
tsh = uint64(time.Now().Unix() / 3600)
file, err := OpenFile(TEMPFILE, O_CREATE|O_RDWR, 0664)
if err != nil {
return 0, 0, tsh, errors.New("Unable to open temp file")
}
defer func() {
file.Sync()
file.Close()
//syscall.Flock(int(file.Fd()), syscall.LOCK_UN)
}()
share := make([]byte, 16)
//syscall.Flock(int(file.Fd()), syscall.LOCK_EX)
n, err := file.Read(share)
if err != nil && err != io.EOF {
return 0, 0, tsh, errors.New("Unable to read temp file")
}
if n == 16 {
var f uint64 = binary.BigEndian.Uint64(share[:8])
var l uint64 = binary.BigEndian.Uint64(share[8:])
if tsh > l {
floor = 1
ceiling = 100000
buf := make([]byte, 8)
binary.BigEndian.PutUint64(buf, uint64(ceiling))
file.WriteAt(buf, 0)
binary.BigEndian.PutUint64(buf, uint64(tsh))
file.WriteAt(buf, 8)
} else {
floor = f
ceiling = f + 100000
buf := make([]byte, 8)
binary.BigEndian.PutUint64(buf, uint64(ceiling))
file.WriteAt(buf, 0)
}
} else if n == 0 {
floor = 1
ceiling = 100000
buf := make([]byte, 8)
binary.BigEndian.PutUint64(buf, uint64(ceiling))
n, err = file.WriteAt(buf, 0)
if err != nil {
return 0, 0, tsh, errors.New("Unable to write index to temp file")
}
binary.BigEndian.PutUint64(buf, uint64(tsh))
n, err = file.WriteAt(buf, 8)
if err != nil {
return 0, 0, tsh, errors.New("Unable to write tsh to temp file")
}
} else {
return 0, 0, tsh, errors.New("Temp file is herpahs corrupted")
}
return floor, ceiling, tsh, nil
}