118 lines
2.9 KiB
Go
118 lines
2.9 KiB
Go
package units
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import (
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"fmt"
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"strconv"
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"strings"
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)
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// Ulimit is a human friendly version of Rlimit.
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type Ulimit struct {
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Name string
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Hard int64
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Soft int64
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}
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// Rlimit specifies the resource limits, such as max open files.
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type Rlimit struct {
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Type int `json:"type,omitempty"`
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Hard uint64 `json:"hard,omitempty"`
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Soft uint64 `json:"soft,omitempty"`
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}
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const (
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// magic numbers for making the syscall
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// some of these are defined in the syscall package, but not all.
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// Also since Windows client doesn't get access to the syscall package, need to
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// define these here
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rlimitAs = 9
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rlimitCore = 4
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rlimitCPU = 0
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rlimitData = 2
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rlimitFsize = 1
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rlimitLocks = 10
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rlimitMemlock = 8
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rlimitMsgqueue = 12
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rlimitNice = 13
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rlimitNofile = 7
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rlimitNproc = 6
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rlimitRss = 5
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rlimitRtprio = 14
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rlimitRttime = 15
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rlimitSigpending = 11
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rlimitStack = 3
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)
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var ulimitNameMapping = map[string]int{
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//"as": rlimitAs, // Disabled since this doesn't seem usable with the way Docker inits a container.
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"core": rlimitCore,
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"cpu": rlimitCPU,
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"data": rlimitData,
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"fsize": rlimitFsize,
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"locks": rlimitLocks,
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"memlock": rlimitMemlock,
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"msgqueue": rlimitMsgqueue,
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"nice": rlimitNice,
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"nofile": rlimitNofile,
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"nproc": rlimitNproc,
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"rss": rlimitRss,
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"rtprio": rlimitRtprio,
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"rttime": rlimitRttime,
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"sigpending": rlimitSigpending,
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"stack": rlimitStack,
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}
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// ParseUlimit parses and returns a Ulimit from the specified string.
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func ParseUlimit(val string) (*Ulimit, error) {
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parts := strings.SplitN(val, "=", 2)
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if len(parts) != 2 {
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return nil, fmt.Errorf("invalid ulimit argument: %s", val)
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}
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if _, exists := ulimitNameMapping[parts[0]]; !exists {
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return nil, fmt.Errorf("invalid ulimit type: %s", parts[0])
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}
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var (
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soft int64
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hard = &soft // default to soft in case no hard was set
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temp int64
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err error
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)
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switch limitVals := strings.Split(parts[1], ":"); len(limitVals) {
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case 2:
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temp, err = strconv.ParseInt(limitVals[1], 10, 64)
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if err != nil {
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return nil, err
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}
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hard = &temp
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fallthrough
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case 1:
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soft, err = strconv.ParseInt(limitVals[0], 10, 64)
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if err != nil {
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return nil, err
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}
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default:
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return nil, fmt.Errorf("too many limit value arguments - %s, can only have up to two, `soft[:hard]`", parts[1])
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}
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if soft > *hard {
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return nil, fmt.Errorf("ulimit soft limit must be less than or equal to hard limit: %d > %d", soft, *hard)
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}
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return &Ulimit{Name: parts[0], Soft: soft, Hard: *hard}, nil
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}
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// GetRlimit returns the RLimit corresponding to Ulimit.
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func (u *Ulimit) GetRlimit() (*Rlimit, error) {
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t, exists := ulimitNameMapping[u.Name]
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if !exists {
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return nil, fmt.Errorf("invalid ulimit name %s", u.Name)
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}
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return &Rlimit{Type: t, Soft: uint64(u.Soft), Hard: uint64(u.Hard)}, nil
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}
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func (u *Ulimit) String() string {
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return fmt.Sprintf("%s=%d:%d", u.Name, u.Soft, u.Hard)
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}
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