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qemu-char: remove dead/confusing logic with nb_stdio_clients

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This code is very old dating back to 2007.  What is puzzling is that
STDIO_MAX_CLIENTS was always #define to 1 meaning that all of the code to deal
with more than one client was unreachable.

Just remove the whole mess of it.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Amit Shah <amit.shah@redhat.com>
Message-id: d276bccdbf4e7463020c5f539f61ae3bfbc88d1d.1362505276.git.amit.shah@redhat.com
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Anthony Liguori 2013-03-05 23:21:17 +05:30
parent baca6f183d
commit ed7a154063
1 changed files with 29 additions and 105 deletions
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134
qemu-char.c
View file

@ -539,9 +539,6 @@ int send_all(int fd, const void *_buf, int len1)
}
#endif /* !_WIN32 */
#define STDIO_MAX_CLIENTS 1
static int stdio_nb_clients;
#ifndef _WIN32
typedef struct {
@ -594,11 +591,8 @@ static void fd_chr_update_read_handler(CharDriverState *chr)
FDCharDriver *s = chr->opaque;
if (s->fd_in >= 0) {
if (display_type == DT_NOGRAPHIC && s->fd_in == 0) {
} else {
qemu_set_fd_handler2(s->fd_in, fd_chr_read_poll,
fd_chr_read, NULL, chr);
}
qemu_set_fd_handler2(s->fd_in, fd_chr_read_poll,
fd_chr_read, NULL, chr);
}
}
@ -607,10 +601,7 @@ static void fd_chr_close(struct CharDriverState *chr)
FDCharDriver *s = chr->opaque;
if (s->fd_in >= 0) {
if (display_type == DT_NOGRAPHIC && s->fd_in == 0) {
} else {
qemu_set_fd_handler2(s->fd_in, NULL, NULL, NULL, NULL);
}
qemu_set_fd_handler2(s->fd_in, NULL, NULL, NULL, NULL);
}
g_free(s);
@ -677,53 +668,6 @@ static CharDriverState *qemu_chr_open_pipe(QemuOpts *opts)
return qemu_chr_open_fd(fd_in, fd_out);
}
/* for STDIO, we handle the case where several clients use it
(nographic mode) */
#define TERM_FIFO_MAX_SIZE 1
static uint8_t term_fifo[TERM_FIFO_MAX_SIZE];
static int term_fifo_size;
static int stdio_read_poll(void *opaque)
{
CharDriverState *chr = opaque;
/* try to flush the queue if needed */
if (term_fifo_size != 0 && qemu_chr_be_can_write(chr) > 0) {
qemu_chr_be_write(chr, term_fifo, 1);
term_fifo_size = 0;
}
/* see if we can absorb more chars */
if (term_fifo_size == 0)
return 1;
else
return 0;
}
static void stdio_read(void *opaque)
{
int size;
uint8_t buf[1];
CharDriverState *chr = opaque;
size = read(0, buf, 1);
if (size == 0) {
/* stdin has been closed. Remove it from the active list. */
qemu_set_fd_handler2(0, NULL, NULL, NULL, NULL);
qemu_chr_be_event(chr, CHR_EVENT_CLOSED);
return;
}
if (size > 0) {
if (qemu_chr_be_can_write(chr) > 0) {
qemu_chr_be_write(chr, buf, 1);
} else if (term_fifo_size == 0) {
term_fifo[term_fifo_size++] = buf[0];
}
}
}
/* init terminal so that we can grab keys */
static struct termios oldtty;
static int old_fd0_flags;
@ -760,8 +704,6 @@ static void qemu_chr_set_echo_stdio(CharDriverState *chr, bool echo)
static void qemu_chr_close_stdio(struct CharDriverState *chr)
{
term_exit();
stdio_nb_clients--;
qemu_set_fd_handler2(0, NULL, NULL, NULL, NULL);
fd_chr_close(chr);
}
@ -769,25 +711,18 @@ static CharDriverState *qemu_chr_open_stdio(QemuOpts *opts)
{
CharDriverState *chr;
if (stdio_nb_clients >= STDIO_MAX_CLIENTS) {
return NULL;
}
if (is_daemonized()) {
error_report("cannot use stdio with -daemonize");
return NULL;
}
if (stdio_nb_clients == 0) {
old_fd0_flags = fcntl(0, F_GETFL);
tcgetattr (0, &oldtty);
fcntl(0, F_SETFL, O_NONBLOCK);
atexit(term_exit);
}
old_fd0_flags = fcntl(0, F_GETFL);
tcgetattr (0, &oldtty);
fcntl(0, F_SETFL, O_NONBLOCK);
atexit(term_exit);
chr = qemu_chr_open_fd(0, 1);
chr->chr_close = qemu_chr_close_stdio;
chr->chr_set_echo = qemu_chr_set_echo_stdio;
qemu_set_fd_handler2(0, stdio_read_poll, stdio_read, NULL, chr);
stdio_nb_clients++;
stdio_allow_signal = qemu_opt_get_bool(opts, "signal",
display_type != DT_NOGRAPHIC);
qemu_chr_fe_set_echo(chr, false);
@ -1448,8 +1383,6 @@ static CharDriverState *qemu_chr_open_pp_fd(int fd)
#else /* _WIN32 */
static CharDriverState *stdio_clients[STDIO_MAX_CLIENTS];
typedef struct {
int max_size;
HANDLE hcom, hrecv, hsend;
@ -1951,7 +1884,6 @@ static void win_stdio_close(CharDriverState *chr)
g_free(chr->opaque);
g_free(chr);
stdio_nb_clients--;
}
static CharDriverState *qemu_chr_open_win_stdio(QemuOpts *opts)
@ -1961,11 +1893,6 @@ static CharDriverState *qemu_chr_open_win_stdio(QemuOpts *opts)
DWORD dwMode;
int is_console = 0;
if (stdio_nb_clients >= STDIO_MAX_CLIENTS
|| ((display_type != DT_NOGRAPHIC) && (stdio_nb_clients != 0))) {
return NULL;
}
chr = g_malloc0(sizeof(CharDriverState));
stdio = g_malloc0(sizeof(WinStdioCharState));
@ -1981,37 +1908,34 @@ static CharDriverState *qemu_chr_open_win_stdio(QemuOpts *opts)
chr->chr_write = win_stdio_write;
chr->chr_close = win_stdio_close;
if (stdio_nb_clients == 0) {
if (is_console) {
if (qemu_add_wait_object(stdio->hStdIn,
win_stdio_wait_func, chr)) {
fprintf(stderr, "qemu_add_wait_object: failed\n");
}
} else {
DWORD dwId;
if (is_console) {
if (qemu_add_wait_object(stdio->hStdIn,
win_stdio_wait_func, chr)) {
fprintf(stderr, "qemu_add_wait_object: failed\n");
}
} 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);
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
|| stdio->hInputDoneEvent == INVALID_HANDLE_VALUE) {
fprintf(stderr, "cannot create stdio thread or event\n");
exit(1);
}
if (qemu_add_wait_object(stdio->hInputReadyEvent,
win_stdio_thread_wait_func, chr)) {
fprintf(stderr, "qemu_add_wait_object: failed\n");
}
if (stdio->hInputThread == INVALID_HANDLE_VALUE
|| stdio->hInputReadyEvent == INVALID_HANDLE_VALUE
|| stdio->hInputDoneEvent == INVALID_HANDLE_VALUE) {
fprintf(stderr, "cannot create stdio thread or event\n");
exit(1);
}
if (qemu_add_wait_object(stdio->hInputReadyEvent,
win_stdio_thread_wait_func, chr)) {
fprintf(stderr, "qemu_add_wait_object: failed\n");
}
}
dwMode |= ENABLE_LINE_INPUT;
stdio_clients[stdio_nb_clients++] = chr;
if (stdio_nb_clients == 1 && is_console) {
if (is_console) {
/* set the terminal in raw mode */
/* ENABLE_QUICK_EDIT_MODE | ENABLE_EXTENDED_FLAGS */
dwMode |= ENABLE_PROCESSED_INPUT;