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Re: [Qemu-devel] [PATCH 11/25] nbd: ask and print error information from


From: Markus Armbruster
Subject: Re: [Qemu-devel] [PATCH 11/25] nbd: ask and print error information from qemu-sockets
Date: Wed, 17 Oct 2012 16:51:16 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.1 (gnu/linux)

Paolo Bonzini <address@hidden> writes:

> Before:
>
>     $ qemu-system-x86_64 nbd:localhost:12345
>     inet_connect_opts: connect(ipv4,yakj.usersys.redhat.com,127.0.0.1,12345): 
> Connection refused
>     qemu-system-x86_64: could not open disk image nbd:localhost:12345: 
> Connection refused
>
> After:
>
>     $ x86_64-softmmu/qemu-system-x86_64 nbd:localhost:12345
>     qemu-system-x86_64: Failed to connect to socket: Connection refused
>     qemu-system-x86_64: could not open disk image nbd:localhost:12345: 
> Connection refused
>
> Signed-off-by: Paolo Bonzini <address@hidden>
> ---
>  nbd.c | 39 +++++++++++++++++++++++++++++++--------
>  1 file modificato, 31 inserzioni(+), 8 rimozioni(-)
>
> diff --git a/nbd.c b/nbd.c
> index f61a288..cec5a94 100644
> --- a/nbd.c
> +++ b/nbd.c
> @@ -208,7 +208,14 @@ int tcp_socket_outgoing(const char *address, uint16_t 
> port)
>  
>  int tcp_socket_outgoing_spec(const char *address_and_port)
>  {
> -    return inet_connect(address_and_port, NULL);
> +    Error *local_err = NULL;
> +    int fd = inet_connect(address_and_port, &local_err);
> +
> +    if (local_err != NULL) {
> +        qerror_report_err(local_err);
> +        error_free(local_err);
> +    }
> +    return fd;
>  }
>  
>  int tcp_socket_incoming(const char *address, uint16_t port)
> @@ -220,22 +227,38 @@ int tcp_socket_incoming(const char *address, uint16_t 
> port)
>  
>  int tcp_socket_incoming_spec(const char *address_and_port)
>  {
> -    char *ostr  = NULL;
> -    int olen = 0;
> -    return inet_listen(address_and_port, ostr, olen, SOCK_STREAM, 0, NULL);
> +    Error *local_err = NULL;
> +    int fd = inet_listen(address_and_port, NULL, 0, SOCK_STREAM, 0, 
> &local_err);
> +
> +    if (local_err != NULL) {
> +        qerror_report_err(local_err);
> +        error_free(local_err);
> +    }
> +    return fd;
>  }
>  
>  int unix_socket_incoming(const char *path)
>  {
> -    char *ostr = NULL;
> -    int olen = 0;
> +    Error *local_err = NULL;
> +    int fd = unix_listen(path, NULL, 0, &local_err);
>  
> -    return unix_listen(path, ostr, olen, NULL);
> +    if (local_err != NULL) {
> +        qerror_report_err(local_err);
> +        error_free(local_err);
> +    }
> +    return fd;
>  }
>  
>  int unix_socket_outgoing(const char *path)
>  {
> -    return unix_connect(path, NULL);
> +    Error *local_err = NULL;
> +    int fd = unix_connect(path, &local_err);
> +
> +    if (local_err != NULL) {
> +        qerror_report_err(local_err);
> +        error_free(local_err);
> +    }
> +    return fd;
>  }
>  
>  /* Basic flow for negotiation

The boilerplate pattern

    Error *local_err = NULL;
    FOO(..., *local_err);
    if (local_err) {
        qerror_report_err(local_err);
        error_free(local_err);
    }

is spreading.  Not quite sure it's worth a macro.



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