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Source file src/os/user/getgrouplist_unix.go

Documentation: os/user

  // Copyright 2016 The Go Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style
  // license that can be found in the LICENSE file.
  // +build dragonfly freebsd !android,linux netbsd openbsd
  // +build cgo,!osusergo
  package user
  #include <unistd.h>
  #include <sys/types.h>
  #include <grp.h>
  static int mygetgrouplist(const char* user, gid_t group, gid_t* groups, int* ngroups) {
  	return getgrouplist(user, group, groups, ngroups);
  import "C"
  import (
  func getGroupList(name *C.char, userGID C.gid_t, gids *C.gid_t, n *C.int) C.int {
  	return C.mygetgrouplist(name, userGID, gids, n)
  // groupRetry retries getGroupList with much larger size for n. The result is
  // stored in gids.
  func groupRetry(username string, name []byte, userGID C.gid_t, gids *[]C.gid_t, n *C.int) error {
  	// More than initial buffer, but now n contains the correct size.
  	if *n > maxGroups {
  		return fmt.Errorf("user: %q is a member of more than %d groups", username, maxGroups)
  	*gids = make([]C.gid_t, *n)
  	rv := getGroupList((*C.char)(unsafe.Pointer(&name[0])), userGID, &(*gids)[0], n)
  	if rv == -1 {
  		return fmt.Errorf("user: list groups for %s failed", username)
  	return nil

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