nbd: move socket wrappers to qemu-nbd

qemu-nbd is one of the few valid users of qerror_report_err.  Move
the error-reporting socket wrappers there.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Reviewed-by: NFam Zheng <famz@redhat.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

include/block/nbd.h

@@ -62,10 +62,6 @@ enum {
 #define NBD_MAX_BUFFER_SIZE (32 * 1024 * 1024)
 
 ssize_t nbd_wr_sync(int fd, void *buffer, size_t size, bool do_read);
-int tcp_socket_incoming(const char *address, uint16_t port);
-int unix_socket_outgoing(const char *path);
-int unix_socket_incoming(const char *path);
-
 int nbd_receive_negotiate(int csock, const char *name, uint32_t *flags,
                           off_t *size, size_t *blocksize);
 int nbd_init(int fd, int csock, uint32_t flags, off_t size, size_t blocksize);

nbd.c

@@ -188,56 +188,6 @@ static ssize_t write_sync(int fd, void *buffer, size_t size)
     return ret;
 }
 
-static void combine_addr(char *buf, size_t len, const char* address,
-                         uint16_t port)
-{
-    /* If the address-part contains a colon, it's an IPv6 IP so needs [] */
-    if (strstr(address, ":")) {
-        snprintf(buf, len, "[%s]:%u", address, port);
-    } else {
-        snprintf(buf, len, "%s:%u", address, port);
-    }
-}
-
-int tcp_socket_incoming(const char *address, uint16_t port)
-{
-    char address_and_port[128];
-    Error *local_err = NULL;
-
-    combine_addr(address_and_port, 128, address, port);
-    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)
-{
-    Error *local_err = NULL;
-    int fd = unix_listen(path, NULL, 0, &local_err);
-
-    if (local_err != NULL) {
-        qerror_report_err(local_err);
-        error_free(local_err);
-    }
-    return fd;
-}
-
-int unix_socket_outgoing(const char *path)
-{
-    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
 
    Server         Client

qemu-nbd.c

@@ -20,6 +20,8 @@
 #include "block/block.h"
 #include "block/nbd.h"
 #include "qemu/main-loop.h"
+#include "qemu/sockets.h"
+#include "qemu/error-report.h"
 #include "block/snapshot.h"
 
 #include <stdarg.h>
@@ -201,6 +203,56 @@ static void termsig_handler(int signum)
     qemu_notify_event();
 }
 
+static void combine_addr(char *buf, size_t len, const char* address,
+                         uint16_t port)
+{
+    /* If the address-part contains a colon, it's an IPv6 IP so needs [] */
+    if (strstr(address, ":")) {
+        snprintf(buf, len, "[%s]:%u", address, port);
+    } else {
+        snprintf(buf, len, "%s:%u", address, port);
+    }
+}
+
+static int tcp_socket_incoming(const char *address, uint16_t port)
+{
+    char address_and_port[128];
+    Error *local_err = NULL;
+
+    combine_addr(address_and_port, 128, address, port);
+    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;
+}
+
+static int unix_socket_incoming(const char *path)
+{
+    Error *local_err = NULL;
+    int fd = unix_listen(path, NULL, 0, &local_err);
+
+    if (local_err != NULL) {
+        qerror_report_err(local_err);
+        error_free(local_err);
+    }
+    return fd;
+}
+
+static int unix_socket_outgoing(const char *path)
+{
+    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;
+}
+
 static void *show_parts(void *arg)
 {
     char *device = arg;