[PATCH v5 3/4] sockets: pass back errors in inet_listen()

[Amos Kong <akong@xxxxxxxxxx>]

Use set_socket_error() to restore real erron,
set errno to EINVAL for parse error.

Signed-off-by: Amos Kong <akong@xxxxxxxxxx>
---
 qemu-sockets.c |   21 ++++++++++++++++-----
 1 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/qemu-sockets.c b/qemu-sockets.c
index 908479e..f1c6524 100644
--- a/qemu-sockets.c
+++ b/qemu-sockets.c
@@ -110,7 +110,7 @@ int inet_listen_opts(QemuOpts *opts, int port_offset)
     char port[33];
     char uaddr[INET6_ADDRSTRLEN+1];
     char uport[33];
-    int slisten, rc, to, port_min, port_max, p;
+    int slisten, rc, to, port_min, port_max, p, err;
 
     memset(&ai,0, sizeof(ai));
     ai.ai_flags = AI_PASSIVE | AI_ADDRCONFIG;
@@ -120,7 +120,8 @@ int inet_listen_opts(QemuOpts *opts, int port_offset)
     if ((qemu_opt_get(opts, "host") == NULL) ||
         (qemu_opt_get(opts, "port") == NULL)) {
         fprintf(stderr, "%s: host and/or port not specified\n", __FUNCTION__);
-        return -1;
+        err = -EINVAL;
+        goto err;
     }
     pstrcpy(port, sizeof(port), qemu_opt_get(opts, "port"));
     addr = qemu_opt_get(opts, "host");
@@ -138,7 +139,8 @@ int inet_listen_opts(QemuOpts *opts, int port_offset)
     if (rc != 0) {
         fprintf(stderr,"getaddrinfo(%s,%s): %s\n", addr, port,
                 gai_strerror(rc));
-        return -1;
+        err = -EINVAL;
+        goto err;
     }
 
     /* create socket + bind */
@@ -150,6 +152,7 @@ int inet_listen_opts(QemuOpts *opts, int port_offset)
         if (slisten < 0) {
             fprintf(stderr,"%s: socket(%s): %s\n", __FUNCTION__,
                     inet_strfamily(e->ai_family), strerror(errno));
+            err = -socket_error();
             continue;
         }
 
@@ -169,6 +172,7 @@ int inet_listen_opts(QemuOpts *opts, int port_offset)
             if (bind(slisten, e->ai_addr, e->ai_addrlen) == 0) {
                 goto listen;
             }
+            err = -socket_error();
             if (p == port_max) {
                 fprintf(stderr,"%s: bind(%s,%s,%d): %s\n", __FUNCTION__,
                         inet_strfamily(e->ai_family), uaddr, inet_getport(e),
@@ -179,14 +183,15 @@ int inet_listen_opts(QemuOpts *opts, int port_offset)
     }
     fprintf(stderr, "%s: FAILED\n", __FUNCTION__);
     freeaddrinfo(res);
-    return -1;
+    goto err;
 
 listen:
     if (listen(slisten,1) != 0) {
+        err = -socket_error();
         perror("listen");
         closesocket(slisten);
         freeaddrinfo(res);
-        return -1;
+        goto err;
     }
     snprintf(uport, sizeof(uport), "%d", inet_getport(e) - port_offset);
     qemu_opt_set(opts, "host", uaddr);
@@ -195,6 +200,10 @@ listen:
     qemu_opt_set(opts, "ipv4", (e->ai_family != PF_INET6) ? "on" : "off");
     freeaddrinfo(res);
     return slisten;
+
+err:
+    set_socket_error(-err);
+    return -1;
 }
 
 int inet_connect_opts(QemuOpts *opts)
@@ -474,6 +483,8 @@ int inet_listen(const char *str, char *ostr, int olen,
                          optstr ? optstr : "");
             }
         }
+    } else {
+        set_socket_error(EINVAL);
     }
     qemu_opts_del(opts);
     return sock;

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