81 lines
2.9 KiB
C
81 lines
2.9 KiB
C
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/*
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* Copyright (c) 2019
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* from an example posted in Apple Developer Support
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* https://forums.developer.apple.com/thread/103162
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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// MP support header
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#include "MacportsLegacySupport.h"
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#if __MP_LEGACY_SUPPORT_FSGETPATH__
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#if 1
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/* SYS_fsgetpath is only available on 10.6 and up */
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#if MAC_OS_X_VERSION_MIN_REQUIRED >= 1060
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/* implement using a syscall available macOS 10.6 to 10.12 */
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/* this should be thoroughly vetted as a syscall, but is private API */
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#include <unistd.h>
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#include <sys/syscall.h>
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#include <sys/types.h>
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#include <sys/mount.h>
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ssize_t fsgetpath(char * buf, size_t buflen, fsid_t * fsid, uint64_t obj_id) {
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return (ssize_t)syscall(SYS_fsgetpath, buf, (size_t)buflen, fsid, (uint64_t)obj_id);
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}
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#endif
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#endif
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#if 0
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/* implement with a compatability function that presently compiles on 10.6 and over */
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/* this may be better (see linked post above) but it's hard to thoroughly test it. */
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/* this may also be able to be expanded to cover 10.4 and 10.5 if we can workaround ATTR_CMN_FULLPATH */
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <getopt.h>
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#include <sys/attr.h>
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#include <sys/mount.h>
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ssize_t fsgetpath(char * buf, size_t buflen, fsid_t * fsid, uint64_t obj_id) {
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char volfsPath[64]; // 8 for `/.vol//\0`, 10 for `fsid->val[0]`, 20 for `obj_id`, rounded up for paranoia
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snprintf(volfsPath, sizeof(volfsPath), "/.vol/%ld/%llu", (long) fsid->val[0], (unsigned long long) obj_id);
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struct {
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uint32_t length;
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attrreference_t pathRef;
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char buffer[MAXPATHLEN];
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} __attribute__((aligned(4), packed)) attrBuf;
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struct attrlist attrList;
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memset(&attrList, 0, sizeof(attrList));
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attrList.bitmapcount = ATTR_BIT_MAP_COUNT;
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attrList.commonattr = ATTR_CMN_FULLPATH;
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int success = getattrlist(volfsPath, &attrList, &attrBuf, sizeof(attrBuf), 0) == 0;
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if ( ! success ) {
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return -1;
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}
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if (attrBuf.pathRef.attr_length > buflen) {
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errno = ENOSPC;
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return -1;
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}
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strlcpy(buf, ((const char *) &attrBuf.pathRef) + attrBuf.pathRef.attr_dataoffset, buflen);
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return attrBuf.pathRef.attr_length;
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}
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#endif
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#endif /* __MP_LEGACY_SUPPORT_FSGETPATH__ */
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