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      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 }
     87