| package ulimit |
| |
| import ( |
| "fmt" |
| "strconv" |
| "strings" |
| ) |
| |
| // Human friendly version of Rlimit |
| type Ulimit struct { |
| Name string |
| Hard int64 |
| Soft int64 |
| } |
| |
| type Rlimit struct { |
| Type int `json:"type,omitempty"` |
| Hard uint64 `json:"hard,omitempty"` |
| Soft uint64 `json:"soft,omitempty"` |
| } |
| |
| const ( |
| // magic numbers for making the syscall |
| // some of these are defined in the syscall package, but not all. |
| // Also since Windows client doesn't get access to the syscall package, need to |
| // define these here |
| RLIMIT_AS = 9 |
| RLIMIT_CORE = 4 |
| RLIMIT_CPU = 0 |
| RLIMIT_DATA = 2 |
| RLIMIT_FSIZE = 1 |
| RLIMIT_LOCKS = 10 |
| RLIMIT_MEMLOCK = 8 |
| RLIMIT_MSGQUEUE = 12 |
| RLIMIT_NICE = 13 |
| RLIMIT_NOFILE = 7 |
| RLIMIT_NPROC = 6 |
| RLIMIT_RSS = 5 |
| RLIMIT_RTPRIO = 14 |
| RLIMIT_RTTIME = 15 |
| RLIMIT_SIGPENDING = 11 |
| RLIMIT_STACK = 3 |
| ) |
| |
| var ulimitNameMapping = map[string]int{ |
| //"as": RLIMIT_AS, // Disbaled since this doesn't seem usable with the way Docker inits a container. |
| "core": RLIMIT_CORE, |
| "cpu": RLIMIT_CPU, |
| "data": RLIMIT_DATA, |
| "fsize": RLIMIT_FSIZE, |
| "locks": RLIMIT_LOCKS, |
| "memlock": RLIMIT_MEMLOCK, |
| "msgqueue": RLIMIT_MSGQUEUE, |
| "nice": RLIMIT_NICE, |
| "nofile": RLIMIT_NOFILE, |
| "nproc": RLIMIT_NPROC, |
| "rss": RLIMIT_RSS, |
| "rtprio": RLIMIT_RTPRIO, |
| "rttime": RLIMIT_RTTIME, |
| "sigpending": RLIMIT_SIGPENDING, |
| "stack": RLIMIT_STACK, |
| } |
| |
| func Parse(val string) (*Ulimit, error) { |
| parts := strings.SplitN(val, "=", 2) |
| if len(parts) != 2 { |
| return nil, fmt.Errorf("invalid ulimit argument: %s", val) |
| } |
| |
| if _, exists := ulimitNameMapping[parts[0]]; !exists { |
| return nil, fmt.Errorf("invalid ulimit type: %s", parts[0]) |
| } |
| |
| limitVals := strings.SplitN(parts[1], ":", 2) |
| if len(limitVals) > 2 { |
| return nil, fmt.Errorf("too many limit value arguments - %s, can only have up to two, `soft[:hard]`", parts[1]) |
| } |
| |
| soft, err := strconv.ParseInt(limitVals[0], 10, 64) |
| if err != nil { |
| return nil, err |
| } |
| |
| hard := soft // in case no hard was set |
| if len(limitVals) == 2 { |
| hard, err = strconv.ParseInt(limitVals[1], 10, 64) |
| } |
| if soft > hard { |
| return nil, fmt.Errorf("ulimit soft limit must be less than or equal to hard limit: %d > %d", soft, hard) |
| } |
| |
| return &Ulimit{Name: parts[0], Soft: soft, Hard: hard}, nil |
| } |
| |
| func (u *Ulimit) GetRlimit() (*Rlimit, error) { |
| t, exists := ulimitNameMapping[u.Name] |
| if !exists { |
| return nil, fmt.Errorf("invalid ulimit name %s", u.Name) |
| } |
| |
| return &Rlimit{Type: t, Soft: uint64(u.Soft), Hard: uint64(u.Hard)}, nil |
| } |
| |
| func (u *Ulimit) String() string { |
| return fmt.Sprintf("%s=%s:%s", u.Name, u.Soft, u.Hard) |
| } |