Fix lchown<->chown problem in late 2.1 kernels.

diff --git a/sysdeps/unix/sysv/linux/chown.c b/sysdeps/unix/sysv/linux/chown.c
new file mode 100644 (file)
index 0000000..f380d93
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/chown.c
@@ -0,0 +1,68 @@
+/* Copyright (C) 1998 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Library General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Library General Public License for more details.
+
+   You should have received a copy of the GNU Library General Public
+   License along with the GNU C Library; see the file COPYING.LIB.  If not,
+   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+   Boston, MA 02111-1307, USA.  */
+
+#include <errno.h>
+#include <unistd.h>
+#include <sys/syscall.h>
+
+/*
+  In Linux 2.1.x the chown functions have been changed.  A new function lchown
+  was introduced.  The new chown now follows symlinks - the old chown and the
+  new lchown do not follow symlinks.
+  The new lchown function has the same number as the old chown had and the
+  new chown has a new number.  When compiling with headers from Linux > 2.1.8x
+  it's impossible to run this libc with older kernels.  In these cases libc
+  has therefore to route calls to chown to the old chown function.
+*/
+
+extern int __syscall_chown (const char *__file,
+                           uid_t __owner, gid_t __group);
+#ifdef __NR_lchown
+/* running under Linux 2.0 or < 2.1.8x */
+static int __libc_old_chown;
+
+
+int
+__chown (const char *file, uid_t owner, gid_t group)
+{
+  int result;
+
+  if (!__libc_old_chown)
+    {
+      int saved_errno = errno;
+      result = __syscall_chown (file, owner, group);
+
+      if (result >= 0 || errno != ENOSYS)
+       return result;
+
+      __set_errno (saved_errno);
+      __libc_old_chown = 1;
+    }
+
+  return __lchown (file, owner, group);
+}
+#else
+/* compiling under older kernels */
+int
+__chown (const char *file, uid_t owner, gid_t group)
+{
+  return __syscall_chown (file, owner, group);
+}
+#endif
+
+weak_alias (__chown, chown)

diff --git a/sysdeps/unix/sysv/linux/syscalls.list b/sysdeps/unix/sysv/linux/syscalls.list
index 3b4af6f1d3b1c7d8985acb871fa810b1a47c439d..bf3129632bf1ce05d761f28668dc662a81a6ab73 100644 (file)
--- a/sysdeps/unix/sysv/linux/syscalls.list
+++ b/sysdeps/unix/sysv/linux/syscalls.list
@@ -36,6 +36,7 @@ pipe          -       pipe            1       __pipe          pipe
 prctl          EXTRA   prctl           5       prctl
 query_module   EXTRA   query_module    5       query_module
 quotactl       EXTRA   quotactl        4       quotactl
+s_chown                chown   chown           3       __syscall_chown
 s_getdents     EXTRA   getdents        3       __getdents
 s_getpriority  getpriority getpriority 2       __syscall_getpriority
 s_poll         poll    poll            3       __syscall_poll