[Qemu-devel] [PATCH v2 03/23] error: Use error_report_err() instead of monitor_printf()

[Markus Armbruster]

Using error_report_err() instead of monitor_printf() makes no
difference when monitor_printf() is used correctly, i.e. within an HMP
monitor.  Elsewhere, monitor_printf() does nothing, while
error_report_err() reports to stderr.

Most changed functions are HMP command handlers.  These should only
run within an HMP monitor.  The one exception is bdrv_password_cb(),
which should also only run within an HMP monitor.

Four command handlers prefix the error message with the command name:
balloon, migrate_set_capability, migrate_set_parameter, migrate.
Pointless, drop.

Coccinelle semantic patch:

    @@
    expression M, E;
    @@
    -    monitor_printf(M, "%s\n", error_get_pretty(E));
    -    error_free(E);
    +    error_report_err(E);
    @r1@
    expression M, E;
    format F;
    position p;
    @@
    -    monitor_printf(M, "address@hidden@\n", error_get_pretty(E));@p
    -    error_free(E);
    +    error_report_err(E);
    @script:python@
        p << r1.p;
    @@
    print "%s:%s:%s: prefix dropped" % (p[0].file, p[0].line, p[0].column)

Signed-off-by: Markus Armbruster <address@hidden>
---
 hmp.c                 | 29 +++++++++--------------------
 hw/s390x/s390-skeys.c |  3 +--
 migration/savevm.c    |  3 +--
 monitor.c             |  6 ++----
 4 files changed, 13 insertions(+), 28 deletions(-)

diff --git a/hmp.c b/hmp.c
index 2140605..96c7c7f 100644
--- a/hmp.c
+++ b/hmp.c
@@ -41,8 +41,7 @@ static void hmp_handle_error(Monitor *mon, Error **errp)
 {
     assert(errp);
     if (*errp) {
-        monitor_printf(mon, "%s\n", error_get_pretty(*errp));
-        error_free(*errp);
+        error_report_err(*errp);
     }
 }
 
@@ -548,8 +547,7 @@ void hmp_info_vnc(Monitor *mon, const QDict *qdict)
 
     info = qmp_query_vnc(&err);
     if (err) {
-        monitor_printf(mon, "%s\n", error_get_pretty(err));
-        error_free(err);
+        error_report_err(err);
         return;
     }
 
@@ -671,8 +669,7 @@ void hmp_info_balloon(Monitor *mon, const QDict *qdict)
 
     info = qmp_query_balloon(&err);
     if (err) {
-        monitor_printf(mon, "%s\n", error_get_pretty(err));
-        error_free(err);
+        error_report_err(err);
         return;
     }
 
@@ -940,8 +937,7 @@ void hmp_ringbuf_read(Monitor *mon, const QDict *qdict)
 
     data = qmp_ringbuf_read(chardev, size, false, 0, &err);
     if (err) {
-        monitor_printf(mon, "%s\n", error_get_pretty(err));
-        error_free(err);
+        error_report_err(err);
         return;
     }
 
@@ -1034,8 +1030,7 @@ void hmp_balloon(Monitor *mon, const QDict *qdict)
 
     qmp_balloon(value, &err);
     if (err) {
-        monitor_printf(mon, "balloon: %s\n", error_get_pretty(err));
-        error_free(err);
+        error_report_err(err);
     }
 }
 
@@ -1183,8 +1178,7 @@ void hmp_migrate_set_cache_size(Monitor *mon, const QDict 
*qdict)
 
     qmp_migrate_set_cache_size(value, &err);
     if (err) {
-        monitor_printf(mon, "%s\n", error_get_pretty(err));
-        error_free(err);
+        error_report_err(err);
         return;
     }
 }
@@ -1221,9 +1215,7 @@ void hmp_migrate_set_capability(Monitor *mon, const QDict 
*qdict)
     qapi_free_MigrationCapabilityStatusList(caps);
 
     if (err) {
-        monitor_printf(mon, "migrate_set_capability: %s\n",
-                       error_get_pretty(err));
-        error_free(err);
+        error_report_err(err);
     }
 }
 
@@ -1273,9 +1265,7 @@ void hmp_migrate_set_parameter(Monitor *mon, const QDict 
*qdict)
     }
 
     if (err) {
-        monitor_printf(mon, "migrate_set_parameter: %s\n",
-                       error_get_pretty(err));
-        error_free(err);
+        error_report_err(err);
     }
 }
 
@@ -1536,8 +1526,7 @@ void hmp_migrate(Monitor *mon, const QDict *qdict)
 
     qmp_migrate(uri, !!blk, blk, !!inc, inc, false, false, &err);
     if (err) {
-        monitor_printf(mon, "migrate: %s\n", error_get_pretty(err));
-        error_free(err);
+        error_report_err(err);
         return;
     }
 
diff --git a/hw/s390x/s390-skeys.c b/hw/s390x/s390-skeys.c
index 539ef6d..4af1558 100644
--- a/hw/s390x/s390-skeys.c
+++ b/hw/s390x/s390-skeys.c
@@ -100,8 +100,7 @@ void hmp_dump_skeys(Monitor *mon, const QDict *qdict)
 
     qmp_dump_skeys(filename, &err);
     if (err) {
-        monitor_printf(mon, "%s\n", error_get_pretty(err));
-        error_free(err);
+        error_report_err(err);
     }
 }
 
diff --git a/migration/savevm.c b/migration/savevm.c
index 0ad1b93..e277b72 100644
--- a/migration/savevm.c
+++ b/migration/savevm.c
@@ -1984,8 +1984,7 @@ void hmp_savevm(Monitor *mon, const QDict *qdict)
     vm_state_size = qemu_ftell(f);
     qemu_fclose(f);
     if (ret < 0) {
-        monitor_printf(mon, "%s\n", error_get_pretty(local_err));
-        error_free(local_err);
+        error_report_err(local_err);
         goto the_end;
     }
 
diff --git a/monitor.c b/monitor.c
index 9a35d72..0843270 100644
--- a/monitor.c
+++ b/monitor.c
@@ -1464,8 +1464,7 @@ static void hmp_boot_set(Monitor *mon, const QDict *qdict)
 
     qemu_boot_set(bootdevice, &local_err);
     if (local_err) {
-        monitor_printf(mon, "%s\n", error_get_pretty(local_err));
-        error_free(local_err);
+        error_report_err(local_err);
     } else {
         monitor_printf(mon, "boot device list now set to %s\n", bootdevice);
     }
@@ -4149,8 +4148,7 @@ static void bdrv_password_cb(void *opaque, const char 
*password,
 
     bdrv_add_key(bs, password, &local_err);
     if (local_err) {
-        monitor_printf(mon, "%s\n", error_get_pretty(local_err));
-        error_free(local_err);
+        error_report_err(local_err);
         ret = -EPERM;
     }
     if (mon->password_completion_cb)
-- 
2.4.3