[Xen-devel] [PATCH] xl: fix compiler warning with fork_exec_bootloader

[Andre Przywara <andre.przywara@xxxxxxx>]

Hi,

at least one of my compilers complains about the broken const
qualifier in the fork_exec_bootloader() call (despite the cast).
Fix this properly by propagating the const attribute down the
call stack.

Regards,
Andre.

Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>

--
Andre Przywara
AMD-Operating System Research Center (OSRC), Dresden, Germany
Tel: +49 351 448-3567-12

>From ad5d2d401741c3e23796072a3304f46ae0a4832e Mon Sep 17 00:00:00 2001
From: Andre Przywara <andre.przywara@xxxxxxx>
Date: Fri, 20 Aug 2010 01:00:17 +0200
Subject: [PATCH 1/4] xl: fix compiler warning with fork_exec_bootloader

At least one of my compilers complains about the broken const
qualifier in the fork_exec_bootloader() call (despite the cast).
Fix this properly by propagating the const attribute down the
call stack.

Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
---
 tools/libxl/libxl_bootloader.c |    4 ++--
 tools/libxl/libxl_exec.c       |    3 ++-
 tools/libxl/libxl_internal.h   |    3 ++-
 3 files changed, 6 insertions(+), 4 deletions(-)

diff --git a/tools/libxl/libxl_bootloader.c b/tools/libxl/libxl_bootloader.c
index e7e88ce..50b9b17 100644
--- a/tools/libxl/libxl_bootloader.c
+++ b/tools/libxl/libxl_bootloader.c
@@ -118,7 +118,7 @@ static int open_xenconsoled_pty(int *master, int *slave, 
char *slave_path, size_
     return 0;
 }
 
-static pid_t fork_exec_bootloader(int *master, char *arg0, char **args)
+static pid_t fork_exec_bootloader(int *master, const char *arg0, char **args)
 {
     struct termios termattr;
     pid_t pid = forkpty(master, NULL, NULL, NULL);
@@ -386,7 +386,7 @@ int libxl_run_bootloader(libxl_ctx *ctx,
     dom_console_xs_path = libxl_sprintf(&gc, "%s/serial/0/tty", 
libxl_xs_get_dompath(&gc, domid));
     libxl_xs_write(&gc, XBT_NULL, dom_console_xs_path, "%s", 
dom_console_slave_tty_path);
 
-    pid = fork_exec_bootloader(&bootloader_fd, (char *)info->u.pv.bootloader, 
args);
+    pid = fork_exec_bootloader(&bootloader_fd, info->u.pv.bootloader, args);
     if (pid < 0) {
         goto out_close;
     }
diff --git a/tools/libxl/libxl_exec.c b/tools/libxl/libxl_exec.c
index 5210c4f..0796f49 100644
--- a/tools/libxl/libxl_exec.c
+++ b/tools/libxl/libxl_exec.c
@@ -35,7 +35,8 @@ static int call_waitpid(pid_t (*waitpid_cb)(pid_t, int *, 
int), pid_t pid, int *
     return (waitpid_cb) ? waitpid_cb(pid, status, options) : waitpid(pid, 
status, options);
 }
 
-void libxl_exec(int stdinfd, int stdoutfd, int stderrfd, char *arg0, char 
**args)
+void libxl_exec(int stdinfd, int stdoutfd, int stderrfd, const char *arg0,
+                char **args)
      /* call this in the child */
 {
     int i;
diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
index 2f81acc..bab576c 100644
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -228,7 +228,8 @@ _hidden int libxl_spawn_check(libxl_ctx *ctx,
 
  /* low-level stuff, for synchronous subprocesses etc. */
 
-_hidden void libxl_exec(int stdinfd, int stdoutfd, int stderrfd, char *arg0, 
char **args); // logs errors, never returns
+_hidden void libxl_exec(int stdinfd, int stdoutfd, int stderrfd,
+               const char *arg0, char **args); // logs errors, never returns
 _hidden void libxl_log_child_exitstatus(libxl_gc *gc,
                                 const char *what, pid_t pid, int status);
 
-- 
1.6.4

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