Re: [Qemu-devel] [PATCH v2] dump: let dump_error return error info to caller

[Eric Blake <eblake@redhat.com>]

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On 09/02/2014 02:25 AM, zhanghailiang wrote:
> The second parameter of dump_error is unused, but one purpose of
> using this function is to report the error info.
> 
> Use error_set to return the error info to the caller.
> 
> Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com>
> ---
>  V2:
> - Return the error reason to the caller which suggested by Luiz Capitulino.
> ---
>  dump.c | 165 ++++++++++++++++++++++++++++++++---------------------------------
>  1 file changed, 82 insertions(+), 83 deletions(-)
> 
> diff --git a/dump.c b/dump.c
> index 71d3e94..0ab72e7 100644
> --- a/dump.c
> +++ b/dump.c
> @@ -81,9 +81,10 @@ static int dump_cleanup(DumpState *s)
>      return 0;
>  }
>  
> -static void dump_error(DumpState *s, const char *reason)
> +static void dump_error(DumpState *s, Error **errp, const char *reason)

The Error **errp is typically listed last.

>  {
>      dump_cleanup(s);
> +    error_setg(errp, "%s", reason);
>  }
>  
>  static int fd_write_vmcore(const void *buf, size_t size, void *opaque)
> @@ -99,7 +100,7 @@ static int fd_write_vmcore(const void *buf, size_t size, void *opaque)
>      return 0;
>  }
>  
> -static int write_elf64_header(DumpState *s)
> +static int write_elf64_header(DumpState *s, Error **errp)
>  {
>      Elf64_Ehdr elf_header;
>      int ret;
> @@ -126,14 +127,14 @@ static int write_elf64_header(DumpState *s)
>  
>      ret = fd_write_vmcore(&elf_header, sizeof(elf_header), s);
>      if (ret < 0) {
> -        dump_error(s, "dump: failed to write elf header.\n");
> +        dump_error(s, errp, "dump: failed to write elf header.\n");

This ends up calling error_setg with a trailing newline, which should
not be needed.  It looks like all of your conversions to the new
dump_error should drop the \n in the message.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


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