Implement the linux syscalls

    openat, mkdirat, mknodat, fchownat, futimesat, fstatat, unlinkat,
    renameat, linkat, symlinkat, readlinkat, fchmodat, faccessat.

Submitted by:	rdivacky
Sponsored by:	Google Summer of Code 2007
Tested by:	pho

1 files changed, 11 insertions, 2 deletions

diff --git a/sys/kern/vfs_lookup.c b/sys/kern/vfs_lookup.c
index dc34249..1b295fc 100644
--- a/sys/kern/vfs_lookup.c
+++ b/sys/kern/vfs_lookup.c
@@ -1032,8 +1032,8 @@ NDFREE(struct nameidata *ndp, const u_int flags)
  * the M_TEMP bucket if one is returned.
  */
 int
-kern_alternate_path(struct thread *td, const char *prefix, char *path,
-    enum uio_seg pathseg, char **pathbuf, int create)
+kern_alternate_path(struct thread *td, const char *prefix, const char *path,
+    enum uio_seg pathseg, char **pathbuf, int create, int dirfd)
 {
 	struct nameidata nd, ndroot;
 	char *ptr, *buf, *cp;
@@ -1071,6 +1071,15 @@ kern_alternate_path(struct thread *td, const char *prefix, char *path,
 		goto keeporig;
 	}
 
+	if (dirfd != AT_FDCWD) {
+		/*
+		 * We want the original because the "prefix" is
+		 * included in the already opened dirfd.
+		 */
+		bcopy(ptr, buf, len);
+		return (0);
+	}
+
 	/*
 	 * We know that there is a / somewhere in this pathname.
 	 * Search backwards for it, to find the file's parent dir