From 8acefc79deaab1c7ee2ab07b540b0e3edf0f9f47 Mon Sep 17 00:00:00 2001
From: Markus Armbruster <armbru@redhat.com>
Date: Mon, 2 Nov 2020 10:44:22 +0100
Subject: sockets: Make abstract UnixSocketAddress depend on CONFIG_LINUX
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The abstract socket namespace is a non-portable Linux extension.  An
attempt to use it elsewhere should fail with ENOENT (the abstract
address looks like a "" pathname, which does not resolve).  We report
this failure like

    Failed to connect socket abc: No such file or directory

Tolerable, although ENOTSUP would be better.

However, introspection lies: it has @abstract regardless of host
support.  Easy enough to fix: since Linux provides them since 2.2,
'if': 'defined(CONFIG_LINUX)' should do.

The above failure becomes

    Parameter 'backend.data.addr.data.abstract' is unexpected

I consider this an improvement.

Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 chardev/char-socket.c | 6 ++++++
 chardev/char.c        | 2 ++
 2 files changed, 8 insertions(+)

(limited to 'chardev')

diff --git a/chardev/char-socket.c b/chardev/char-socket.c
index 27a2954f47..213a4c8dd0 100644
--- a/chardev/char-socket.c
+++ b/chardev/char-socket.c
@@ -447,12 +447,14 @@ static char *qemu_chr_socket_address(SocketChardev *s, const char *prefix)
         const char *tight = "", *abstract = "";
         UnixSocketAddress *sa = &s->addr->u.q_unix;
 
+#ifdef CONFIG_LINUX
         if (sa->has_abstract && sa->abstract) {
             abstract = ",abstract";
             if (sa->has_tight && sa->tight) {
                 tight = ",tight";
             }
         }
+#endif
 
         return g_strdup_printf("%sunix:%s%s%s%s", prefix, sa->path,
                                abstract, tight,
@@ -1398,8 +1400,10 @@ static void qemu_chr_parse_socket(QemuOpts *opts, ChardevBackend *backend,
     const char *host = qemu_opt_get(opts, "host");
     const char *port = qemu_opt_get(opts, "port");
     const char *fd = qemu_opt_get(opts, "fd");
+#ifdef CONFIG_LINUX
     bool tight = qemu_opt_get_bool(opts, "tight", true);
     bool abstract = qemu_opt_get_bool(opts, "abstract", false);
+#endif
     SocketAddressLegacy *addr;
     ChardevSocket *sock;
 
@@ -1451,10 +1455,12 @@ static void qemu_chr_parse_socket(QemuOpts *opts, ChardevBackend *backend,
         addr->type = SOCKET_ADDRESS_LEGACY_KIND_UNIX;
         q_unix = addr->u.q_unix.data = g_new0(UnixSocketAddress, 1);
         q_unix->path = g_strdup(path);
+#ifdef CONFIG_LINUX
         q_unix->has_tight = true;
         q_unix->tight = tight;
         q_unix->has_abstract = true;
         q_unix->abstract = abstract;
+#endif
     } else if (host) {
         addr->type = SOCKET_ADDRESS_LEGACY_KIND_INET;
         addr->u.inet.data = g_new(InetSocketAddress, 1);
diff --git a/chardev/char.c b/chardev/char.c
index 78553125d3..aa4282164a 100644
--- a/chardev/char.c
+++ b/chardev/char.c
@@ -928,6 +928,7 @@ QemuOptsList qemu_chardev_opts = {
         },{
             .name = "logappend",
             .type = QEMU_OPT_BOOL,
+#ifdef CONFIG_LINUX
         },{
             .name = "tight",
             .type = QEMU_OPT_BOOL,
@@ -935,6 +936,7 @@ QemuOptsList qemu_chardev_opts = {
         },{
             .name = "abstract",
             .type = QEMU_OPT_BOOL,
+#endif
         },
         { /* end of list */ }
     },
-- 
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