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Re: [Qemu-devel] [patch] replace all strdup() with g_strdup()
From: |
Daniel P. Berrange |
Subject: |
Re: [Qemu-devel] [patch] replace all strdup() with g_strdup() |
Date: |
Fri, 16 Dec 2011 09:41:17 +0000 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Fri, Dec 16, 2011 at 10:26:33AM +0100, Paolo Bonzini wrote:
> On 12/16/2011 09:07 AM, Jun Koi wrote:
> >This patch replaces all the strdup() with g_strdup()
> >
> >Signed-off-by: Jun Koi<address@hidden>
> >
> >$ diffstat strdup.diff
> > cmd.c | 4 ++--
> > envlist.c | 6 +++---
> > exec.c | 2 +-
> > hw/isa-bus.c | 2 +-
> > hw/pc.c | 2 +-
> > hw/pci.c | 2 +-
> > hw/qdev.c | 2 +-
> > hw/scsi-bus.c | 2 +-
> > hw/sun4m.c | 6 +++---
> > hw/sun4u.c | 2 +-
> > hw/usb-msd.c | 2 +-
> > hw/virtio-blk.c | 2 +-
> > ia64-dis.c | 2 +-
> > microblaze-dis.c | 18 +++++++++---------
> > path.c | 2 +-
> > readline.c | 2 +-
> > test-qmp-commands.c | 12 ++++++------
> > 17 files changed, 35 insertions(+), 35 deletions(-)
>
> You cannot do this unless you also convert all free to g_free. So
> you also cannot do this when you are passing strings to libraries
> that take ownership of the strings. A search-and-replace conversion
> is not possible.
Yes & no. In general you are correct that g_malloc/g_strdup needs to
be matched with g_free, but in the context of the QEMU binary at least
we don't strictly need that.
The general issue is that GLib's memory allocators default to the
system malloc/free, but with g_mem_set_vtable it is possible
to override those allocators.
So any libraries using GLib should definitely take care to match
g_malloc/g_strdup/g_free, but if you are a self contained program
that never calls g_mem_set_vtable, we don't technically have to
worry about it.
That all said, we probably *do* want to take care todo the matching
for any parts of the QEMU codebase which may end up being built into
ELF libraries for external consumption.
Regards,
Daniel.
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