usr/src/cmd/svc/startd/file.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 2004 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 /*
  30  * file.c - file dependency vertex code
  31  *
  32  *   In principle, file dependencies should be retested on mount/unmount
  33  *   events, and dependency error flow used to determine whether a lost file
  34  *   affects the dependent service.  If mount/unmount events are not available,
  35  *   the kstat facility (which registers or deregisters a statistic at
  36  *   mount/umount) could be used as an indirect filesystem event detector.
  37  *
  38  *   In practice, file dependencies are checked only for existence at start
  39  *   time.
  40  */
  41
  42 #include <sys/stat.h>
  43 #include <sys/types.h>
  44 #include <errno.h>
  45 #include <stdio.h>
  46 #include <string.h>
  47 #include <strings.h>
  48
  49 #include <startd.h>
  50
  51 int
  52 file_ready(graph_vertex_t *v)
  53 {
  54         char *fn;
  55         struct stat sbuf;
  56         int r;
  57         char *file_fmri = v->gv_name;
  58
  59         /*
  60          * Advance through file: FMRI until we have an absolute file path.
  61          */
  62         if (strncmp(file_fmri, "file:///", sizeof ("file:///") - 1) == 0) {
  63                 fn = file_fmri + sizeof ("file://") - 1;
  64         } else if (strncmp(file_fmri, "file://localhost/",
  65                 sizeof ("file://localhost/") - 1) == 0) {
  66                 fn = file_fmri + sizeof ("file://localhost") - 1;
  67         } else if (strncmp(file_fmri, "file://", sizeof ("file://") - 1)
  68             == 0) {
  69                 fn = file_fmri + sizeof ("file://") - 1;
  70
  71                 /*
  72                  * Again, search for the next '/'.
  73                  */
  74                 if ((fn = strchr(fn, '/')) == NULL)
  75                         return (0);
  76         }
  77
  78         /*
  79          * If stat(2) succeeds for that path, then the dependency is satisfied.
  80          */
  81         do {
  82                 r = stat(fn, &sbuf);
  83         } while (r == -1 && errno == EINTR);
  84
  85         return (r == -1 ? 0 : 1);
  86 }