diff options
| -rw-r--r-- | winsup/cygwin/fhandler_disk_file.cc | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/winsup/cygwin/fhandler_disk_file.cc b/winsup/cygwin/fhandler_disk_file.cc index 07f9c513a..5e58688b7 100644 --- a/winsup/cygwin/fhandler_disk_file.cc +++ b/winsup/cygwin/fhandler_disk_file.cc @@ -887,15 +887,18 @@ fhandler_disk_file::fchown (uid_t uid, gid_t gid) aclp, MAX_ACL_ENTRIES)) < 0) goto out; - if (uid == ILLEGAL_UID) - uid = old_uid; - if (gid == ILLEGAL_GID) - gid = old_gid; - if (uid == old_uid && gid == old_gid) + /* According to POSIX, chown can be a no-op if uid is (uid_t)-1 and + gid is (gid_t)-1. Otherwise, even if uid and gid are unchanged, + we must ensure that ctime is updated. */ + if (uid == ILLEGAL_UID && gid == ILLEGAL_GID) { ret = 0; goto out; } + if (uid == ILLEGAL_UID) + uid = old_uid; + else if (gid == ILLEGAL_GID) + gid = old_gid; /* Windows ACLs can contain permissions for one group, while being owned by another user/group. The permission bits returned above are pretty much |