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Subject[PATCH 2/2] UML - xterm driver tidying
Major tidying of the xterm console driver:
got rid of the tt-mode gdb support
tidied up the includes
fixed lots of style violations
replaced os_* calls with glibc calls in xterm.c
all printk calls now have a severity indicator
the error paths of xterm_open are closer to being right

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
--
arch/um/drivers/ssl.c | 2
arch/um/drivers/stdio_console.c | 2
arch/um/drivers/xterm.c | 173 ++++++++++++++++++++--------------------
arch/um/drivers/xterm_kern.c | 49 +++--------
arch/um/include/chan_user.h | 2
5 files changed, 105 insertions(+), 123 deletions(-)

Index: linux-2.6.21-mm/arch/um/drivers/ssl.c
===================================================================
--- linux-2.6.21-mm.orig/arch/um/drivers/ssl.c 2007-06-11 21:14:50.000000000 -0400
+++ linux-2.6.21-mm/arch/um/drivers/ssl.c 2007-06-11 21:15:08.000000000 -0400
@@ -42,8 +42,6 @@ static struct chan_opts opts = {
.announce = ssl_announce,
.xterm_title = "Serial Line #%d",
.raw = 1,
- .tramp_stack = 0,
- .in_kernel = 1,
};

static int ssl_config(char *str, char **error_out);
Index: linux-2.6.21-mm/arch/um/drivers/stdio_console.c
===================================================================
--- linux-2.6.21-mm.orig/arch/um/drivers/stdio_console.c 2007-06-11 21:14:50.000000000 -0400
+++ linux-2.6.21-mm/arch/um/drivers/stdio_console.c 2007-06-11 21:15:08.000000000 -0400
@@ -46,8 +46,6 @@ static struct chan_opts opts = {
.announce = stdio_announce,
.xterm_title = "Virtual Console #%d",
.raw = 1,
- .tramp_stack = 0,
- .in_kernel = 1,
};

static int con_config(char *str, char **error_out);
Index: linux-2.6.21-mm/arch/um/drivers/xterm.c
===================================================================
--- linux-2.6.21-mm.orig/arch/um/drivers/xterm.c 2007-06-11 21:14:51.000000000 -0400
+++ linux-2.6.21-mm/arch/um/drivers/xterm.c 2007-06-11 21:15:16.000000000 -0400
@@ -1,22 +1,20 @@
/*
- * Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL
*/

-#include <stdio.h>
#include <stdlib.h>
+#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <termios.h>
-#include <signal.h>
-#include <sched.h>
-#include <sys/socket.h>
-#include "kern_util.h"
#include "chan_user.h"
-#include "user.h"
#include "os.h"
+#include "init.h"
+#include "user.h"
#include "xterm.h"
+#include "kern_constants.h"

struct xterm_chan {
int pid;
@@ -25,25 +23,21 @@ struct xterm_chan {
int device;
int raw;
struct termios tt;
- unsigned long stack;
- int direct_rcv;
};

-/* Not static because it's called directly by the tt mode gdb code */
-void *xterm_init(char *str, int device, const struct chan_opts *opts)
+static void *xterm_init(char *str, int device, const struct chan_opts *opts)
{
struct xterm_chan *data;

data = malloc(sizeof(*data));
- if(data == NULL) return(NULL);
- *data = ((struct xterm_chan) { .pid = -1,
+ if (data == NULL)
+ return NULL;
+ *data = ((struct xterm_chan) { .pid = -1,
.helper_pid = -1,
- .device = device,
+ .device = device,
.title = opts->xterm_title,
- .raw = opts->raw,
- .stack = opts->tramp_stack,
- .direct_rcv = !opts->in_kernel } );
- return(data);
+ .raw = opts->raw } );
+ return data;
}

/* Only changed by xterm_setup, which is a setup */
@@ -57,16 +51,22 @@ static int __init xterm_setup(char *line
terminal_emulator = line;

line = strchr(line, ',');
- if(line == NULL) return(0);
+ if (line == NULL)
+ return 0;
+
*line++ = '\0';
- if(*line) title_switch = line;
+ if (*line)
+ title_switch = line;

line = strchr(line, ',');
- if(line == NULL) return(0);
+ if (line == NULL)
+ return 0;
+
*line++ = '\0';
- if(*line) exec_switch = line;
+ if (*line)
+ exec_switch = line;

- return(0);
+ return 0;
}

__uml_setup("xterm=", xterm_setup,
@@ -82,114 +82,128 @@ __uml_setup("xterm=", xterm_setup,
" are 'xterm=gnome-terminal,-t,-x'.\n\n"
);

-/* XXX This badly needs some cleaning up in the error paths
- * Not static because it's called directly by the tt mode gdb code
- */
-int xterm_open(int input, int output, int primary, void *d,
+static int xterm_open(int input, int output, int primary, void *d,
char **dev_out)
{
struct xterm_chan *data = d;
- unsigned long stack;
int pid, fd, new, err;
char title[256], file[] = "/tmp/xterm-pipeXXXXXX";
- char *argv[] = { terminal_emulator, title_switch, title, exec_switch,
+ char *argv[] = { terminal_emulator, title_switch, title, exec_switch,
"/usr/lib/uml/port-helper", "-uml-socket",
file, NULL };

- if(os_access(argv[4], OS_ACC_X_OK) < 0)
+ if (access(argv[4], X_OK) < 0)
argv[4] = "port-helper";

/* Check that DISPLAY is set, this doesn't guarantee the xterm
* will work but w/o it we can be pretty sure it won't. */
- if (!getenv("DISPLAY")) {
- printk("xterm_open: $DISPLAY not set.\n");
+ if (getenv("DISPLAY") == NULL) {
+ printk(UM_KERN_ERR "xterm_open: $DISPLAY not set.\n");
return -ENODEV;
}

+ /*
+ * This business of getting a descriptor to a temp file,
+ * deleting the file and closing the descriptor is just to get
+ * a known-unused name for the Unix socket that we really
+ * want.
+ */
fd = mkstemp(file);
- if(fd < 0){
+ if (fd < 0) {
err = -errno;
- printk("xterm_open : mkstemp failed, errno = %d\n", errno);
+ printk(UM_KERN_ERR "xterm_open : mkstemp failed, errno = %d\n",
+ errno);
return err;
}

- if(unlink(file)){
+ if (unlink(file)) {
err = -errno;
- printk("xterm_open : unlink failed, errno = %d\n", errno);
+ printk(UM_KERN_ERR "xterm_open : unlink failed, errno = %d\n",
+ errno);
return err;
}
- os_close_file(fd);
+ close(fd);

fd = os_create_unix_socket(file, sizeof(file), 1);
- if(fd < 0){
- printk("xterm_open : create_unix_socket failed, errno = %d\n",
- -fd);
- return(fd);
+ if (fd < 0) {
+ printk(UM_KERN_ERR "xterm_open : create_unix_socket failed, "
+ "errno = %d\n", -fd);
+ return fd;
}

sprintf(title, data->title, data->device);
- stack = data->stack;
- pid = run_helper(NULL, NULL, argv, &stack);
- if(pid < 0){
- printk("xterm_open : run_helper failed, errno = %d\n", -pid);
- return(pid);
+ pid = run_helper(NULL, NULL, argv, NULL);
+ if (pid < 0) {
+ err = pid;
+ printk(UM_KERN_ERR "xterm_open : run_helper failed, "
+ "errno = %d\n", -err);
+ goto out_close1;
}

- if (data->direct_rcv) {
- new = os_rcv_fd(fd, &data->helper_pid);
- } else {
- err = os_set_fd_block(fd, 0);
- if(err < 0){
- printk("xterm_open : failed to set descriptor "
- "non-blocking, err = %d\n", -err);
- return(err);
- }
- new = xterm_fd(fd, &data->helper_pid);
+ err = os_set_fd_block(fd, 0);
+ if (err < 0) {
+ printk(UM_KERN_ERR "xterm_open : failed to set descriptor "
+ "non-blocking, err = %d\n", -err);
+ goto out_kill;
}
- if(new < 0){
- printk("xterm_open : os_rcv_fd failed, err = %d\n", -new);
- goto out;
+
+ new = xterm_fd(fd, &data->helper_pid);
+ if (new < 0) {
+ err = new;
+ printk(UM_KERN_ERR "xterm_open : os_rcv_fd failed, err = %d\n",
+ -err);
+ goto out_kill;
}

err = os_set_fd_block(new, 0);
if (err) {
- printk("xterm_open : failed to set xterm descriptor "
- "non-blocking, err = %d\n", -err);
- goto out;
+ printk(UM_KERN_ERR "xterm_open : failed to set xterm "
+ "descriptor non-blocking, err = %d\n", -err);
+ goto out_close2;
}

CATCH_EINTR(err = tcgetattr(new, &data->tt));
- if(err){
+ if (err) {
new = err;
- goto out;
+ goto out_close2;
}

- if(data->raw){
+ if (data->raw) {
err = raw(new);
- if(err){
+ if (err) {
new = err;
- goto out;
+ goto out_close2;
}
}

+ unlink(file);
data->pid = pid;
*dev_out = NULL;
- out:
- unlink(file);
- return(new);
+
+ return new;
+
+ out_close2:
+ close(new);
+ out_kill:
+ os_kill_process(pid, 1);
+ out_close1:
+ close(fd);
+
+ return err;
}

-/* Not static because it's called directly by the tt mode gdb code */
-void xterm_close(int fd, void *d)
+static void xterm_close(int fd, void *d)
{
struct xterm_chan *data = d;

- if(data->pid != -1)
+ if (data->pid != -1)
os_kill_process(data->pid, 1);
data->pid = -1;
- if(data->helper_pid != -1)
+
+ if (data->helper_pid != -1)
os_kill_process(data->helper_pid, 0);
data->helper_pid = -1;
+
os_close_file(fd);
}

@@ -210,14 +224,3 @@ const struct chan_ops xterm_ops = {
.free = xterm_free,
.winch = 1,
};
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only. This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
Index: linux-2.6.21-mm/arch/um/include/chan_user.h
===================================================================
--- linux-2.6.21-mm.orig/arch/um/include/chan_user.h 2007-06-11 21:14:50.000000000 -0400
+++ linux-2.6.21-mm/arch/um/include/chan_user.h 2007-06-11 21:15:08.000000000 -0400
@@ -12,8 +12,6 @@ struct chan_opts {
void (*const announce)(char *dev_name, int dev);
char *xterm_title;
const int raw;
- const unsigned long tramp_stack;
- const int in_kernel;
};

enum chan_init_pri { INIT_STATIC, INIT_ALL, INIT_ONE };
Index: linux-2.6.21-mm/arch/um/drivers/xterm_kern.c
===================================================================
--- linux-2.6.21-mm.orig/arch/um/drivers/xterm_kern.c 2007-06-11 21:14:51.000000000 -0400
+++ linux-2.6.21-mm/arch/um/drivers/xterm_kern.c 2007-06-11 21:15:16.000000000 -0400
@@ -1,18 +1,14 @@
/*
- * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
* Licensed under the GPL
*/

-#include "linux/errno.h"
-#include "linux/slab.h"
-#include "linux/signal.h"
-#include "linux/interrupt.h"
-#include "asm/irq.h"
-#include "irq_user.h"
+#include <linux/slab.h>
+#include <linux/completion.h>
+#include <linux/irqreturn.h>
+#include <asm/irq.h>
#include "irq_kern.h"
-#include "kern_util.h"
#include "os.h"
-#include "xterm.h"

struct xterm_wait {
struct completion ready;
@@ -27,12 +23,13 @@ static irqreturn_t xterm_interrupt(int i
int fd;

fd = os_rcv_fd(xterm->fd, &xterm->pid);
- if(fd == -EAGAIN)
- return(IRQ_NONE);
+ if (fd == -EAGAIN)
+ return IRQ_NONE;

xterm->new_fd = fd;
complete(&xterm->ready);
- return(IRQ_HANDLED);
+
+ return IRQ_HANDLED;
}

int xterm_fd(int socket, int *pid_out)
@@ -41,22 +38,21 @@ int xterm_fd(int socket, int *pid_out)
int err, ret;

data = kmalloc(sizeof(*data), GFP_KERNEL);
- if(data == NULL){
+ if (data == NULL) {
printk(KERN_ERR "xterm_fd : failed to allocate xterm_wait\n");
- return(-ENOMEM);
+ return -ENOMEM;
}

/* This is a locked semaphore... */
- *data = ((struct xterm_wait)
- { .fd = socket,
- .pid = -1,
- .new_fd = -1 });
+ *data = ((struct xterm_wait) { .fd = socket,
+ .pid = -1,
+ .new_fd = -1 });
init_completion(&data->ready);

- err = um_request_irq(XTERM_IRQ, socket, IRQ_READ, xterm_interrupt,
+ err = um_request_irq(XTERM_IRQ, socket, IRQ_READ, xterm_interrupt,
IRQF_DISABLED | IRQF_SHARED | IRQF_SAMPLE_RANDOM,
"xterm", data);
- if (err){
+ if (err) {
printk(KERN_ERR "xterm_fd : failed to get IRQ for xterm, "
"err = %d\n", err);
ret = err;
@@ -76,16 +72,5 @@ int xterm_fd(int socket, int *pid_out)
out:
kfree(data);

- return(ret);
+ return ret;
}
-
-/*
- * Overrides for Emacs so that we follow Linus's tabbing style.
- * Emacs will notice this stuff at the end of the file and automatically
- * adjust the settings for this buffer only. This must remain at the end
- * of the file.
- * ---------------------------------------------------------------------------
- * Local variables:
- * c-file-style: "linux"
- * End:
- */
-
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