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net/dump: Improve -net/host_net_add dump error reporting

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When -net dump fails, it first reports a specific error, then a
generic one, like this:

    $ qemu-system-x86_64 -net dump,id=foo,file=/eperm
    qemu-system-x86_64: -net dump,id=foo,file=/eperm: -net dump: can't open /eperm
    qemu-system-x86_64: -net dump,id=foo,file=/eperm: Device 'dump' could not be initialized

Convert net_init_tap() to Error.  This suppresses the unwanted second
message.

Improve the error messages to include strerror(errno) where
appropriate.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-id: 1431691143-1015-5-git-send-email-armbru@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Markus Armbruster 2015-05-15 13:58:52 +02:00 committed by Stefan Hajnoczi
parent 6630886863
commit 3791f83ca9
1 changed files with 6 additions and 6 deletions
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12
net/dump.c
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@ -101,7 +101,8 @@ static NetClientInfo net_dump_info = {
};
static int net_dump_init(NetClientState *peer, const char *device,
const char *name, const char *filename, int len)
const char *name, const char *filename, int len,
Error **errp)
{
struct pcap_file_hdr hdr;
NetClientState *nc;
@ -111,7 +112,7 @@ static int net_dump_init(NetClientState *peer, const char *device,
fd = open(filename, O_CREAT | O_TRUNC | O_WRONLY | O_BINARY, 0644);
if (fd < 0) {
error_report("-net dump: can't open %s", filename);
error_setg_errno(errp, errno, "-net dump: can't open %s", filename);
return -1;
}
@ -124,7 +125,7 @@ static int net_dump_init(NetClientState *peer, const char *device,
hdr.linktype = 1;
if (write(fd, &hdr, sizeof(hdr)) < sizeof(hdr)) {
error_report("-net dump write error: %s", strerror(errno));
error_setg_errno(errp, errno, "-net dump write error");
close(fd);
return -1;
}
@ -148,7 +149,6 @@ static int net_dump_init(NetClientState *peer, const char *device,
int net_init_dump(const NetClientOptions *opts, const char *name,
NetClientState *peer, Error **errp)
{
/* FIXME error_setg(errp, ...) on failure */
int len;
const char *file;
char def_file[128];
@ -174,7 +174,7 @@ int net_init_dump(const NetClientOptions *opts, const char *name,
if (dump->has_len) {
if (dump->len > INT_MAX) {
error_report("invalid length: %"PRIu64, dump->len);
error_setg(errp, "invalid length: %"PRIu64, dump->len);
return -1;
}
len = dump->len;
@ -182,5 +182,5 @@ int net_init_dump(const NetClientOptions *opts, const char *name,
len = 65536;
}
return net_dump_init(peer, "dump", name, file, len);
return net_dump_init(peer, "dump", name, file, len, errp);
}