go/src/os/user/cgo_lookup_unix.go

func current() (*User, error) { … }

func lookupUser(username string) (*User, error) { … }

func lookupUserId(uid string) (*User, error) { … }

func lookupUnixUid(uid int) (*User, error) { … }

func buildUser(pwd *_C_struct_passwd) *User { … }

func lookupGroup(groupname string) (*Group, error) { … }

func lookupGroupId(gid string) (*Group, error) { … }

func lookupUnixGid(gid int) (*Group, error) { … }

func buildGroup(grp *_C_struct_group) *Group { … }

type bufferKind …

var userBuffer …

var groupBuffer …

func (k bufferKind) initialSize() _C_size_t { … }

// retryWithBuffer repeatedly calls f(), increasing the size of the
// buffer each time, until f succeeds, fails with a non-ERANGE error,
// or the buffer exceeds a reasonable limit.
func retryWithBuffer(kind bufferKind, f func([]byte) syscall.Errno) error { … }

const maxBufferSize …

func isSizeReasonable(sz int64) bool { … }

// Because we can't use cgo in tests:
func structPasswdForNegativeTest() _C_struct_passwd { … }