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Source file src/os/user/getgrouplist_darwin.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.
  
  package user
  
  /*
  #include <unistd.h>
  #include <sys/types.h>
  #include <stdlib.h>
  
  static int mygetgrouplist(const char* user, gid_t group, gid_t* groups, int* ngroups) {
  	int* buf = malloc(*ngroups * sizeof(int));
  	int rv = getgrouplist(user, (int) group, buf, ngroups);
  	int i;
  	if (rv == 0) {
  		for (i = 0; i < *ngroups; i++) {
  			groups[i] = (gid_t) buf[i];
  		}
  	}
  	free(buf);
  	return rv;
  }
  */
  import "C"
  import (
  	"fmt"
  	"unsafe"
  )
  
  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 an increasingly large 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 {
  	*n = C.int(256 * 2)
  	for {
  		*gids = make([]C.gid_t, *n)
  		rv := getGroupList((*C.char)(unsafe.Pointer(&name[0])), userGID, &(*gids)[0], n)
  		if rv >= 0 {
  			// n is set correctly
  			break
  		}
  		if *n > maxGroups {
  			return fmt.Errorf("user: %q is a member of more than %d groups", username, maxGroups)
  		}
  		*n = *n * C.int(2)
  	}
  	return nil
  }
  

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