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Re: The patch of glibc which allows the user to override the pfinet serv

From: Samuel Thibault
Subject: Re: The patch of glibc which allows the user to override the pfinet server
Date: Sat, 9 Aug 2008 13:44:19 +0100
User-agent: Mutt/1.5.12-2006-07-14

zhengda, le Sat 09 Aug 2008 13:59:19 +0200, a écrit :
>      if (name)
>        free (name);

No need for an if here, free(NULL); is void already.

> When I build the glibc, I got the error as follow:
> CPP='gcc-4.2 -E -x c-header'  
> /root/storage/glibc-2.7/build-tree/hurd-i386-libc/elf/ld.so.1 
> --library-path 
> /root/storage/glibc-2.7/build-tree/hurd-i386-libc:/root/storage/glibc-2.7/build-tree/hurd-i386-libc/math:/root/storage/glibc-2.7/build-tree/hurd-i386-libc/elf:/root/storage/glibc-2.7/build-tree/hurd-i386-libc/dlfcn:/root/storage/glibc-2.7/build-tree/hurd-i386-libc/nss:/root/storage/glibc-2.7/build-tree/hurd-i386-libc/nis:/root/storage/glibc-2.7/build-tree/hurd-i386-libc/rt:/root/storage/glibc-2.7/build-tree/hurd-i386-libc/resolv:/root/storage/glibc-2.7/build-tree/hurd-i386-libc/crypt:/root/storage/glibc-2.7/build-tree/hurd-i386-libc/mach:/root/storage/glibc-2.7/build-tree/hurd-i386-libc/hurd:/X11R6/lib
> /root/storage/glibc-2.7/build-tree/hurd-i386-libc/sunrpc/rpcgen -Y 
> ../scripts -c rpcsvc/bootparam_prot.x -o 
> /root/storage/glibc-2.7/build-tree/hurd-i386-libc/sunrpc/xbootparam_prot.T
> rpcgen: hurdmalloc.c:287: _hurd_free: Assertion `((h)->check) == 
> 0x8a3c743e' failed.
> make[2]: *** 
> [/root/storage/glibc-2.7/build-tree/hurd-i386-libc/sunrpc/xbootparam_prot.stmp]
> Aborted
> make[2]: Leaving directory 
> `/root/storage/glibc-2.7/build-tree/glibc-2.7/sunrpc'
> make[1]: *** [sunrpc/others] Error 2
> make[1]: Leaving directory `/root/storage/glibc-2.7/build-tree/glibc-2.7'
> make: *** [all] Error 2
> I don't understand what the error means

See hurrdmalloc.c:287.  That's a double free.

> and I cannot find any problems in my code myself.

I had a look and could not find, except you should initialize server to
MACH_PORT_NULL, since you have a code path that doesn't initialize it.

> Can anyone see the problem in my code?

The problem may not be directly in your code.  You should run the test
by hand in gdb, something like:

LD_LIBRARY_PATH=/root/storage/glibc-2.7/build-tree/hurd-i386-libc gdb --args 
/root/storage/glibc-2.7/build-tree/hurd-i386-libc/sunrpc/rpcgen -Y ../scripts 
-c rpcsvc/bootparam_prot.x -o 

to get a backtrace.


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