X-Git-Url: http://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fat-func.c;h=31a75f175f8e183dde3627816c7c8953bbda6e81;hb=2bbd4523187af328f114150c97847f7fb915ac82;hp=373b5f6bcb6a97a58d0c463a96259e4c3fe4afa8;hpb=4563696df77d8821f868784330b68629726d233f;p=gnulib.git

diff --git a/lib/at-func.c b/lib/at-func.c
index 373b5f6bc..31a75f175 100644
--- a/lib/at-func.c
+++ b/lib/at-func.c
@@ -1,5 +1,5 @@
 /* Define an at-style functions like fstatat, unlinkat, fchownat, etc.
-   Copyright (C) 2006, 2009 Free Software Foundation, Inc.
+   Copyright (C) 2006, 2009-2011 Free Software Foundation, Inc.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -22,15 +22,15 @@
 #include "save-cwd.h"
 
 #ifdef AT_FUNC_USE_F1_COND
-# define CALL_FUNC(F)				\
-  (flag == AT_FUNC_USE_F1_COND			\
-    ? AT_FUNC_F1 (F AT_FUNC_POST_FILE_ARGS)	\
+# define CALL_FUNC(F)                           \
+  (flag == AT_FUNC_USE_F1_COND                  \
+    ? AT_FUNC_F1 (F AT_FUNC_POST_FILE_ARGS)     \
     : AT_FUNC_F2 (F AT_FUNC_POST_FILE_ARGS))
-# define VALIDATE_FLAG(F)			\
-  if (flag & ~AT_FUNC_USE_F1_COND)		\
-    {						\
-      errno = EINVAL;				\
-      return -1;				\
+# define VALIDATE_FLAG(F)                       \
+  if (flag & ~AT_FUNC_USE_F1_COND)              \
+    {                                           \
+      errno = EINVAL;                           \
+      return FUNC_FAIL;                         \
     }
 #else
 # define CALL_FUNC(F) (AT_FUNC_F1 (F AT_FUNC_POST_FILE_ARGS))
@@ -43,11 +43,18 @@
 # define FUNC_RESULT int
 #endif
 
+#ifdef AT_FUNC_FAIL
+# define FUNC_FAIL AT_FUNC_FAIL
+#else
+# define FUNC_FAIL -1
+#endif
+
 /* Call AT_FUNC_F1 to operate on FILE, which is in the directory
    open on descriptor FD.  If AT_FUNC_USE_F1_COND is defined to a value,
    AT_FUNC_POST_FILE_PARAM_DECLS must inlude a parameter named flag;
    call AT_FUNC_F2 if FLAG is 0 or fail if FLAG contains more bits than
-   AT_FUNC_USE_F1_COND.  If possible, do it without changing the
+   AT_FUNC_USE_F1_COND.  Return int and fail with -1 unless AT_FUNC_RESULT
+   or AT_FUNC_FAIL are defined.  If possible, do it without changing the
    working directory.  Otherwise, resort to using save_cwd/fchdir,
    then AT_FUNC_F?/restore_cwd.  If either the save_cwd or the restore_cwd
    fails, then give a diagnostic and exit nonzero.  */
@@ -77,7 +84,7 @@ AT_FUNC_NAME (int fd, char const *file AT_FUNC_POST_FILE_PARAM_DECLS)
         /* If the syscall succeeds, or if it fails with an unexpected
            errno value, then return right away.  Otherwise, fall through
            and resort to using save_cwd/restore_cwd.  */
-        if (0 <= proc_result)
+        if (FUNC_FAIL != proc_result)
           return proc_result;
         if (! EXPECTED_ERRNO (proc_errno))
           {
@@ -96,7 +103,7 @@ AT_FUNC_NAME (int fd, char const *file AT_FUNC_POST_FILE_PARAM_DECLS)
          begin with.  */
       free_cwd (&saved_cwd);
       errno = EBADF;
-      return -1;
+      return FUNC_FAIL;
     }
 
   if (fchdir (fd) != 0)
@@ -104,11 +111,11 @@ AT_FUNC_NAME (int fd, char const *file AT_FUNC_POST_FILE_PARAM_DECLS)
       saved_errno = errno;
       free_cwd (&saved_cwd);
       errno = saved_errno;
-      return -1;
+      return FUNC_FAIL;
     }
 
   err = CALL_FUNC (file);
-  saved_errno = (err < 0 ? errno : 0);
+  saved_errno = (err == FUNC_FAIL ? errno : 0);
 
   if (restore_cwd (&saved_cwd) != 0)
     openat_restore_fail (errno);
@@ -121,3 +128,4 @@ AT_FUNC_NAME (int fd, char const *file AT_FUNC_POST_FILE_PARAM_DECLS)
 }
 #undef CALL_FUNC
 #undef FUNC_RESULT
+#undef FUNC_FAIL