usr/src/lib/libproject/common/project_walk.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright (c) 2001 by Sun Microsystems, Inc.
  24  * All rights reserved.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include <sys/syscall.h>
  30
  31 #include <project.h>
  32 #include <stdlib.h>
  33 #include <errno.h>
  34
  35 static size_t
  36 projlist(id_t *idbuf, size_t idbufsz)
  37 {
  38         return (syscall(SYS_tasksys, 3, 0, 0, idbuf, idbufsz));
  39 }
  40
  41 int
  42 project_walk(int (*callback)(projid_t, void *), void *init_data)
  43 {
  44         int ret = 0;
  45         projid_t *projids = NULL;
  46         projid_t *curr_projid;
  47         size_t sz;
  48         size_t osz = 0;
  49
  50         while ((sz = projlist(projids, osz * sizeof (projid_t))) != osz) {
  51                 osz = sz;
  52                 curr_projid = projids;
  53                 if ((projids = realloc(projids, sz * sizeof (projid_t)))
  54                     == NULL) {
  55                         /*
  56                          * If realloc() fails, we return ENOMEM.
  57                          */
  58                         if (errno == EAGAIN)
  59                                 errno = ENOMEM;
  60                         if (curr_projid != NULL)
  61                                 free(curr_projid);
  62                         return (-1);
  63                 }
  64         }
  65
  66         for (curr_projid = projids; curr_projid < projids + sz; curr_projid++) {
  67                 if (ret = callback(*curr_projid, init_data))
  68                         break;
  69         }
  70
  71         free(projids);
  72         return (ret);
  73 }