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qemu-char: convert stdio backend to data-driven creation 

The backend now always returns errors via the Error* argument.
This avoids a double error message.  Before:

    qemu-system-x86_64: -chardev stdio,id=base: cannot use stdio with -daemonize
    qemu-system-x86_64: -chardev stdio,id=base: Failed to create chardev

After:

    qemu-system-x86_64: -chardev stdio,id=base: cannot use stdio with -daemonize

Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2015-09-29 15:40:28 +02:00
parent 0498790173
commit 8c84b25d97
1 changed files with 39 additions and 18 deletions
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57
qemu-char.c
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@ -1168,19 +1168,23 @@ static void qemu_chr_close_stdio(struct CharDriverState *chr)
fd_chr_close(chr);
}
static CharDriverState *qemu_chr_open_stdio(ChardevStdio *opts)
static CharDriverState *qemu_chr_open_stdio(const char *id,
ChardevBackend *backend,
ChardevReturn *ret,
Error **errp)
{
ChardevStdio *opts = backend->stdio;
CharDriverState *chr;
struct sigaction act;
if (is_daemonized()) {
error_report("cannot use stdio with -daemonize");
error_setg(errp, "cannot use stdio with -daemonize");
return NULL;
}
if (stdio_in_use) {
error_report("cannot use stdio by multiple character devices");
exit(1);
error_setg(errp, "cannot use stdio by multiple character devices");
return NULL;
}
stdio_in_use = true;
@ -2341,7 +2345,10 @@ static void win_stdio_close(CharDriverState *chr)
g_free(chr);
}
static CharDriverState *qemu_chr_open_stdio(ChardevStdio *opts)
static CharDriverState *qemu_chr_open_stdio(const char *id,
ChardevBackend *backend,
ChardevReturn *ret,
Error **errp)
{
CharDriverState *chr;
WinStdioCharState *stdio;
@ -2353,8 +2360,8 @@ static CharDriverState *qemu_chr_open_stdio(ChardevStdio *opts)
stdio->hStdIn = GetStdHandle(STD_INPUT_HANDLE);
if (stdio->hStdIn == INVALID_HANDLE_VALUE) {
fprintf(stderr, "cannot open stdio: invalid handle\n");
exit(1);
error_setg(errp, "cannot open stdio: invalid handle");
return NULL;
}
is_console = GetConsoleMode(stdio->hStdIn, &dwMode) != 0;
@ -2366,25 +2373,30 @@ static CharDriverState *qemu_chr_open_stdio(ChardevStdio *opts)
if (is_console) {
if (qemu_add_wait_object(stdio->hStdIn,
win_stdio_wait_func, chr)) {
fprintf(stderr, "qemu_add_wait_object: failed\n");
error_setg(errp, "qemu_add_wait_object: failed");
goto err1;
}
} else {
DWORD dwId;
stdio->hInputReadyEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
stdio->hInputDoneEvent = CreateEvent(NULL, FALSE, FALSE, NULL);
stdio->hInputThread = CreateThread(NULL, 0, win_stdio_thread,
chr, 0, &dwId);
if (stdio->hInputThread == INVALID_HANDLE_VALUE
|| stdio->hInputReadyEvent == INVALID_HANDLE_VALUE
if (stdio->hInputReadyEvent == INVALID_HANDLE_VALUE
|| stdio->hInputDoneEvent == INVALID_HANDLE_VALUE) {
fprintf(stderr, "cannot create stdio thread or event\n");
exit(1);
error_setg(errp, "cannot create event");
goto err2;
}
if (qemu_add_wait_object(stdio->hInputReadyEvent,
win_stdio_thread_wait_func, chr)) {
fprintf(stderr, "qemu_add_wait_object: failed\n");
error_setg(errp, "qemu_add_wait_object: failed");
goto err2;
}
stdio->hInputThread = CreateThread(NULL, 0, win_stdio_thread,
chr, 0, &dwId);
if (stdio->hInputThread == INVALID_HANDLE_VALUE) {
error_setg(errp, "cannot create stdio thread");
goto err3;
}
}
@ -2402,6 +2414,15 @@ static CharDriverState *qemu_chr_open_stdio(ChardevStdio *opts)
qemu_chr_fe_set_echo(chr, false);
return chr;
err3:
qemu_del_wait_object(stdio->hInputReadyEvent, NULL, NULL);
err2:
CloseHandle(stdio->hInputReadyEvent);
CloseHandle(stdio->hInputDoneEvent);
err1:
qemu_del_wait_object(stdio->hStdIn, NULL, NULL);
return NULL;
}
#endif /* !_WIN32 */
@ -4321,7 +4342,7 @@ ChardevReturn *qmp_chardev_add(const char *id, ChardevBackend *backend,
abort();
break;
case CHARDEV_BACKEND_KIND_STDIO:
chr = qemu_chr_open_stdio(backend->stdio);
abort();
break;
#ifdef _WIN32
case CHARDEV_BACKEND_KIND_CONSOLE:
@ -4411,7 +4432,7 @@ static void register_types(void)
register_char_driver("file", CHARDEV_BACKEND_KIND_FILE,
qemu_chr_parse_file_out, qmp_chardev_open_file);
register_char_driver("stdio", CHARDEV_BACKEND_KIND_STDIO,
qemu_chr_parse_stdio, NULL);
qemu_chr_parse_stdio, qemu_chr_open_stdio);
#if defined HAVE_CHARDEV_SERIAL
register_char_driver("serial", CHARDEV_BACKEND_KIND_SERIAL,
qemu_chr_parse_serial, qmp_chardev_open_serial);