From c386664b94e2392f2d2cca35d7f8e9c6cb3c85c2 Mon Sep 17 00:00:00 2001
From: root <root>
Date: Tue, 5 Jul 2011 09:24:11 +0000
Subject: realpath

---
 Changes |  1 +
 eio.c   | 14 ++++++++++++++
 eio.h   |  3 ++-
 eio.pod |  6 ++++++
 4 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/Changes b/Changes
index df451d9..7db1bf2 100644
--- a/Changes
+++ b/Changes
@@ -49,4 +49,5 @@ TODO: fadvise request
           large transfers, using a heuristic.
         - use libecb, and apply lots of minor space optimisations.
         - disable sendfile on darwin, broken as everything else.
+        - add realpath function.
 
diff --git a/eio.c b/eio.c
index 7330a7f..c3795e0 100644
--- a/eio.c
+++ b/eio.c
@@ -837,6 +837,10 @@ int eio_poll (void)
 /*****************************************************************************/
 /* work around various missing functions */
 
+#if _POSIX_VERSION < 200809L
+# define realpath(path,resolved_path) (errno = ENOSYS, 0)
+#endif
+
 #if !HAVE_PREADWRITE
 # undef pread
 # undef pwrite
@@ -1776,6 +1780,11 @@ eio_execute (etp_worker *self, eio_req *req)
       case EIO_SYMLINK:   req->result = symlink   (req->ptr1, req->ptr2); break;
       case EIO_MKNOD:     req->result = mknod     (req->ptr1, (mode_t)req->int2, (dev_t)req->offs); break;
 
+      case EIO_REALPATH:  req->flags |= EIO_FLAG_PTR2_FREE;
+                          req->ptr2   = realpath (req->ptr1, 0);
+                          req->result = req->ptr2 ? strlen (req->ptr2) : -1;
+                          break;
+
       case EIO_READLINK:  ALLOC (PATH_MAX);
                           req->result = readlink  (req->ptr1, req->ptr2, PATH_MAX); break;
 
@@ -2002,6 +2011,11 @@ eio_req *eio_readlink (const char *path, int pri, eio_cb cb, void *data)
   return eio__1path (EIO_READLINK, path, pri, cb, data);
 }
 
+eio_req *eio_realpath (const char *path, int pri, eio_cb cb, void *data)
+{
+  return eio__1path (EIO_REALPATH, path, pri, cb, data);
+}
+
 eio_req *eio_stat (const char *path, int pri, eio_cb cb, void *data)
 {
   return eio__1path (EIO_STAT, path, pri, cb, data);
diff --git a/eio.h b/eio.h
index cad405d..2f96681 100644
--- a/eio.h
+++ b/eio.h
@@ -154,7 +154,7 @@ enum
   EIO_MLOCK, EIO_MLOCKALL,
   EIO_UNLINK, EIO_RMDIR, EIO_MKDIR, EIO_RENAME,
   EIO_MKNOD, EIO_READDIR,
-  EIO_LINK, EIO_SYMLINK, EIO_READLINK,
+  EIO_LINK, EIO_SYMLINK, EIO_READLINK, EIO_REALPATH,
   EIO_GROUP, EIO_NOP,
   EIO_BUSY
 };
@@ -284,6 +284,7 @@ eio_req *eio_readdir   (const char *path, int flags, int pri, eio_cb cb, void *d
 eio_req *eio_rmdir     (const char *path, int pri, eio_cb cb, void *data);
 eio_req *eio_unlink    (const char *path, int pri, eio_cb cb, void *data);
 eio_req *eio_readlink  (const char *path, int pri, eio_cb cb, void *data); /* result=ptr2 allocated dynamically */
+eio_req *eio_realpath  (const char *path, int pri, eio_cb cb, void *data); /* result=ptr2 allocated dynamically */
 eio_req *eio_stat      (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */
 eio_req *eio_lstat     (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */
 eio_req *eio_statvfs   (const char *path, int pri, eio_cb cb, void *data); /* stat buffer=ptr2 allocated dynamically */
diff --git a/eio.pod b/eio.pod
index d14df1c..3b1f31b 100644
--- a/eio.pod
+++ b/eio.pod
@@ -322,6 +322,12 @@ C<< req->result >>.
       free (target);
     }
 
+=item eio_realpath  (const char *path, int pri, eio_cb cb, void *data)
+
+Similar to the realpath libc function, but unlike that one, result is
+C<0> on failure and the length of the returned path in C<ptr2> - this is
+similar to readlink.
+
 =item eio_stat      (const char *path, int pri, eio_cb cb, void *data)
 
 =item eio_lstat     (const char *path, int pri, eio_cb cb, void *data)
-- 
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