If event_notifier_init fails QEMU exits without printing
any error information to the user. This commit adds an error
message on failure:
# qemu [...]
qemu: Failed to initialize event notifier: Too many open files in system
qemu: qemu_init_main_loop failed
Signed-off-by: Chrysostomos Nanakos <cnana...@grnet.gr>
---
async.c | 17 ++++++++++++-----
include/block/aio.h | 2 +-
include/qemu/main-loop.h | 2 +-
iothread.c | 10 +++++++++-
main-loop.c | 9 +++++++--
qemu-img.c | 11 ++++++++++-
qemu-io.c | 10 +++++++++-
qemu-nbd.c | 12 +++++++++---
tests/test-aio.c | 10 +++++++++-
tests/test-thread-pool.c | 10 +++++++++-
tests/test-throttle.c | 10 +++++++++-
vl.c | 7 +++++--
12 files changed, 90 insertions(+), 20 deletions(-)
diff --git a/async.c b/async.c
index a99e7f6..1839754 100644
--- a/async.c
+++ b/async.c
@@ -289,18 +289,25 @@ static void aio_rfifolock_cb(void *opaque)
aio_notify(opaque);
}
-AioContext *aio_context_new(void)
+AioContext *aio_context_new(Error **errp)
{
+ int ret;
AioContext *ctx;
ctx = (AioContext *) g_source_new(&aio_source_funcs, sizeof(AioContext));
+ ret = event_notifier_init(&ctx->notifier, false);
+ if (ret < 0) {
+ g_source_destroy(&ctx->source);
+ error_setg_errno(errp, -ret, "Failed to initialize event notifier");
+ errno = -ret;
+ return NULL;
+ }
+ aio_set_event_notifier(ctx, &ctx->notifier,
+ (EventNotifierHandler *)
+ event_notifier_test_and_clear);
ctx->pollfds = g_array_new(FALSE, FALSE, sizeof(GPollFD));
ctx->thread_pool = NULL;
qemu_mutex_init(&ctx->bh_lock);
rfifolock_init(&ctx->lock, aio_rfifolock_cb, ctx);
- event_notifier_init(&ctx->notifier, false);
- aio_set_event_notifier(ctx, &ctx->notifier,
- (EventNotifierHandler *)
- event_notifier_test_and_clear);
timerlistgroup_init(&ctx->tlg, aio_timerlist_notify, ctx);
return ctx;
diff --git a/include/block/aio.h b/include/block/aio.h
index 4603c0f..f3d5517 100644
--- a/include/block/aio.h
+++ b/include/block/aio.h
@@ -99,7 +99,7 @@ void aio_set_dispatching(AioContext *ctx, bool dispatching);
* They also provide bottom halves, a service to execute a piece of code
* as soon as possible.
*/
-AioContext *aio_context_new(void);
+AioContext *aio_context_new(Error **errp);
/**
* aio_context_ref:
diff --git a/include/qemu/main-loop.h b/include/qemu/main-loop.h
index 6f0200a..62c68c0 100644
--- a/include/qemu/main-loop.h
+++ b/include/qemu/main-loop.h
@@ -42,7 +42,7 @@
*
* In the case of QEMU tools, this will also start/initialize timers.
*/
-int qemu_init_main_loop(void);
+int qemu_init_main_loop(Error **errp);
/**
* main_loop_wait: Run one iteration of the main loop.
diff --git a/iothread.c b/iothread.c
index d9403cf..bd96ae7 100644
--- a/iothread.c
+++ b/iothread.c
@@ -17,6 +17,7 @@
#include "block/aio.h"
#include "sysemu/iothread.h"
#include "qmp-commands.h"
+#include "qemu/error-report.h"
#define IOTHREADS_PATH "/objects"
@@ -63,10 +64,17 @@ static void iothread_instance_finalize(Object *obj)
static void iothread_complete(UserCreatable *obj, Error **errp)
{
+ Error *local_error = NULL;
IOThread *iothread = IOTHREAD(obj);
iothread->stopping = false;
- iothread->ctx = aio_context_new();
+ iothread->ctx = aio_context_new(&local_error);
+ if (!iothread->ctx) {
+ error_report("%s", error_get_pretty(local_error));
+ error_report("Failed to create AIO context");
+ error_free(local_error);
+ exit(1);
+ }
iothread->thread_id = -1;
qemu_mutex_init(&iothread->init_done_lock);
diff --git a/main-loop.c b/main-loop.c
index 3cc79f8..40c0afa 100644
--- a/main-loop.c
+++ b/main-loop.c
@@ -126,10 +126,11 @@ void qemu_notify_event(void)
static GArray *gpollfds;
-int qemu_init_main_loop(void)
+int qemu_init_main_loop(Error **errp)
{
int ret;
GSource *src;
+ Error *local_error = NULL;
init_clocks();
@@ -138,8 +139,12 @@ int qemu_init_main_loop(void)
return ret;
}
+ qemu_aio_context = aio_context_new(&local_error);
+ if (!qemu_aio_context) {
+ error_propagate(errp, local_error);
+ return -errno;
+ }
gpollfds = g_array_new(FALSE, FALSE, sizeof(GPollFD));
- qemu_aio_context = aio_context_new();
src = aio_get_g_source(qemu_aio_context);
g_source_attach(src, NULL);
g_source_unref(src);
diff --git a/qemu-img.c b/qemu-img.c
index 91d1ac3..6b15bbf 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -2879,7 +2879,9 @@ int main(int argc, char **argv)
{
const img_cmd_t *cmd;
const char *cmdname;
+ Error *local_error = NULL;
int c;
+ int ret;
static const struct option long_options[] = {
{"help", no_argument, 0, 'h'},
{"version", no_argument, 0, 'v'},
@@ -2893,7 +2895,14 @@ int main(int argc, char **argv)
error_set_progname(argv[0]);
qemu_init_exec_dir(argv[0]);
- qemu_init_main_loop();
+ ret = qemu_init_main_loop(&local_error);
+ if (ret < 0) {
+ error_report("%s", error_get_pretty(local_error));
+ error_report("qemu_init_main_loop failed");
+ error_free(local_error);
+ exit(EXIT_FAILURE);
+ }
+
bdrv_init();
if (argc < 2) {
error_exit("Not enough arguments");
diff --git a/qemu-io.c b/qemu-io.c
index d2ab694..e632d59 100644
--- a/qemu-io.c
+++ b/qemu-io.c
@@ -377,8 +377,10 @@ int main(int argc, char **argv)
{ NULL, 0, NULL, 0 }
};
int c;
+ int ret;
int opt_index = 0;
int flags = BDRV_O_UNMAP;
+ Error *local_error = NULL;
#ifdef CONFIG_POSIX
signal(SIGPIPE, SIG_IGN);
@@ -444,7 +446,13 @@ int main(int argc, char **argv)
exit(1);
}
- qemu_init_main_loop();
+ ret = qemu_init_main_loop(&local_error);
+ if (ret < 0) {
+ error_report("%s", error_get_pretty(local_error));
+ error_report("qemu_init_main_loop failed");
+ error_free(local_error);
+ return ret;
+ }
bdrv_init();
/* initialize commands */
diff --git a/qemu-nbd.c b/qemu-nbd.c
index 9bc152e..ed206ed 100644
--- a/qemu-nbd.c
+++ b/qemu-nbd.c
@@ -498,13 +498,13 @@ int main(int argc, char **argv)
BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF,
&local_err);
if (local_err) {
- errx(EXIT_FAILURE, "Failed to parse detect_zeroes mode: %s",
+ errx(EXIT_FAILURE, "Failed to parse detect_zeroes mode: %s",
error_get_pretty(local_err));
}
if (detect_zeroes == BLOCKDEV_DETECT_ZEROES_OPTIONS_UNMAP &&
!(flags & BDRV_O_UNMAP)) {
errx(EXIT_FAILURE, "setting detect-zeroes to unmap is not
allowed "
- "without setting discard operation to
unmap");
+ "without setting discard operation to
unmap");
}
break;
case 'b':
@@ -674,7 +674,13 @@ int main(int argc, char **argv)
snprintf(sockpath, 128, SOCKET_PATH, basename(device));
}
- qemu_init_main_loop();
+ ret = qemu_init_main_loop(&local_err);
+ if (ret < 0) {
+ error_report("%s", error_get_pretty(local_err));
+ error_report("qemu_init_main_loop failed");
+ error_free(local_err);
+ exit(EXIT_FAILURE);
+ }
bdrv_init();
atexit(bdrv_close_all);
diff --git a/tests/test-aio.c b/tests/test-aio.c
index c6a8713..4cb3783 100644
--- a/tests/test-aio.c
+++ b/tests/test-aio.c
@@ -14,6 +14,7 @@
#include "block/aio.h"
#include "qemu/timer.h"
#include "qemu/sockets.h"
+#include "qemu/error-report.h"
static AioContext *ctx;
@@ -810,11 +811,18 @@ static void test_source_timer_schedule(void)
int main(int argc, char **argv)
{
+ Error *local_error;
GSource *src;
init_clocks();
- ctx = aio_context_new();
+ ctx = aio_context_new(&local_error);
+ if (!ctx) {
+ error_report("%s", error_get_pretty(local_error));
+ error_report("Failed to create AIO context");
+ error_free(local_error);
+ exit(1);
+ }
src = aio_get_g_source(ctx);
g_source_attach(src, NULL);
g_source_unref(src);
diff --git a/tests/test-thread-pool.c b/tests/test-thread-pool.c
index f40b7fc..ff6a8b0 100644
--- a/tests/test-thread-pool.c
+++ b/tests/test-thread-pool.c
@@ -4,6 +4,7 @@
#include "block/thread-pool.h"
#include "block/block.h"
#include "qemu/timer.h"
+#include "qemu/error-report.h"
static AioContext *ctx;
static ThreadPool *pool;
@@ -205,10 +206,17 @@ static void test_cancel(void)
int main(int argc, char **argv)
{
int ret;
+ Error *local_error;
init_clocks();
- ctx = aio_context_new();
+ ctx = aio_context_new(&local_error);
+ if (!ctx) {
+ error_report("%s", error_get_pretty(local_error));
+ error_report("Failed to create AIO context");
+ error_free(local_error);
+ exit(1);
+ }
pool = aio_get_thread_pool(ctx);
g_test_init(&argc, &argv, NULL);
diff --git a/tests/test-throttle.c b/tests/test-throttle.c
index 000ae31..7be607a 100644
--- a/tests/test-throttle.c
+++ b/tests/test-throttle.c
@@ -14,6 +14,7 @@
#include <math.h>
#include "block/aio.h"
#include "qemu/throttle.h"
+#include "qemu/error-report.h"
static AioContext *ctx;
static LeakyBucket bkt;
@@ -492,10 +493,17 @@ static void test_accounting(void)
int main(int argc, char **argv)
{
GSource *src;
+ Error *local_error;
init_clocks();
- ctx = aio_context_new();
+ ctx = aio_context_new(&local_error);
+ if (!ctx) {
+ error_report("%s", error_get_pretty(local_error));
+ error_report("Failed to create AIO context");
+ error_free(local_error);
+ exit(1);
+ }
src = aio_get_g_source(ctx);
g_source_attach(src, NULL);
g_source_unref(src);
diff --git a/vl.c b/vl.c
index 5db0d08..1340f6f 100644
--- a/vl.c
+++ b/vl.c
@@ -2968,6 +2968,7 @@ int main(int argc, char **argv, char **envp)
ram_addr_t maxram_size = default_ram_size;
uint64_t ram_slots = 0;
FILE *vmstate_dump_file = NULL;
+ Error *main_loop_err = NULL;
atexit(qemu_run_exit_notifiers);
error_set_progname(argv[0]);
@@ -3998,8 +3999,10 @@ int main(int argc, char **argv, char **envp)
os_daemonize();
- if (qemu_init_main_loop()) {
- fprintf(stderr, "qemu_init_main_loop failed\n");
+ if (qemu_init_main_loop(&main_loop_err)) {
+ error_report("%s", error_get_pretty(main_loop_err));
+ error_report("qemu_init_main_loop failed");
+ error_free(main_loop_err);
exit(1);
}
--
1.7.10.4
