Re: [Qemu-devel] [RFC PATCH] Darwin: Fix compilation warning regarding the deprecated daemon() function

[Andreas Färber]

Am 02.06.2011 um 04:45 schrieb Alexandre Raymond:

> On OSX > 10.5, daemon() is deprecated, resulting int he following  
> warning:

>= 10.5

http://developer.apple.com/library/mac/#documentation/Darwin/Reference/ 
ManPages/man3/daemon.3.html

> ----8<----
> qemu-nbd.c: In function ‘main’:
> qemu-nbd.c:371: warning: ‘daemon’ is deprecated (declared at /usr/ 
> include/stdlib.h:289)
> ----8<----
>
> The following trick, used in mDNSResponder, takes care of this  
> warning:
> http://www.opensource.apple.com/source/mDNSResponder/mDNSResponder-258.18/mDNSPosix/PosixDaemon.c

Even if apparently applied by Apple themselves, I consider it a bad  
hack for curing symptoms.

http://developer.apple.com/library/mac/technotes/tn2083/_index.html#// 
apple_ref/doc/uid/DTS10003794-CH1-SUBSECTION64

Possibly a better fix would be to supply a .plist file for use with  
launchd/launchctl and to #ifndef __APPLE__ the daemon() functionality?

Further comments inline.

> Signed-off-by: Alexandre Raymond <address@hidden>
> ---
> qemu-nbd.c |    9 +++++++++
> 1 files changed, 9 insertions(+), 0 deletions(-)
>
> diff --git a/qemu-nbd.c b/qemu-nbd.c
> index e858033..10b0791 100644
> --- a/qemu-nbd.c
> +++ b/qemu-nbd.c
> @@ -16,6 +16,10 @@
>  *  along with this program; if not, see <http://www.gnu.org/ 
> licenses/>.
>  */
>
> +#if __APPLE__

#ifdef __APPLE__

> +#define daemon fake_daemon_function
> +#endif
> +
> #include <qemu-common.h>
> #include "block_int.h"
> #include "nbd.h"
> @@ -32,6 +36,11 @@
> #include <signal.h>
> #include <libgen.h>
>
> +#if __APPLE__

dito

> +#undef daemon
> +extern int daemon(int, int);

Blue Swirl has declared war on "extern"... ;)

> +#endif
> +
> #define SOCKET_PATH    "/var/lock/qemu-nbd-%s"
>
> #define NBD_BUFFER_SIZE (1024*1024)
> --
> 1.7.5

Andreas