[PATCH] uml: remove os_isatty

os_isatty can be made to disappear by moving maybe_sigio_broken from kernel to
user code.  This also lets write_sigio_workaround become static.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

4 files changed, 16 insertions, 23 deletions

diff --git a/arch/um/include/os.h b/arch/um/include/os.h
index 700f7a76c822..548f6ddd8597 100644
--- a/arch/um/include/os.h
+++ b/arch/um/include/os.h
@@ -318,7 +318,6 @@ extern void reboot_skas(void);
 
 /* irq.c */
 extern int os_waiting_for_events(struct irq_fd *active_fds);
-extern int os_isatty(int fd);
 extern int os_create_pollfd(int fd, int events, void *tmp_pfd, int size_tmpfds);
 extern void os_free_irq_by_cb(int (*test)(struct irq_fd *, void *), void *arg,
                 struct irq_fd *active_fds, struct irq_fd ***last_irq_ptr2);
@@ -330,9 +329,9 @@ extern void os_set_ioignore(void);
 extern void init_irq_signals(int on_sigstack);
 
 /* sigio.c */
-extern void write_sigio_workaround(void);
 extern int add_sigio_fd(int fd, int read);
 extern int ignore_sigio_fd(int fd);
+extern void maybe_sigio_broken(int fd, int read);
 
 /* skas/trap */
 extern void sig_handler_common_skas(int sig, void *sc_ptr);
diff --git a/arch/um/kernel/irq.c b/arch/um/kernel/irq.c
index 27bc58ad38fd..589c69a75043 100644
--- a/arch/um/kernel/irq.c
+++ b/arch/um/kernel/irq.c
@@ -110,19 +110,6 @@ void sigio_handler(int sig, union uml_pt_regs *regs)
         free_irqs();
 }
 
-static void maybe_sigio_broken(int fd, int type)
-{
-        if (os_isatty(fd)) {
-                if ((type == IRQ_WRITE) && !pty_output_sigio) {
-                        write_sigio_workaround();
-                        add_sigio_fd(fd, 0);
-                } else if ((type == IRQ_READ) && !pty_close_sigio) {
-                        write_sigio_workaround();
-                        add_sigio_fd(fd, 1);
-                }
-        }
-}
-
 static DEFINE_SPINLOCK(irq_lock);
 
 int activate_fd(int irq, int fd, int type, void *dev_id)
@@ -221,7 +208,7 @@ int activate_fd(int irq, int fd, int type, void *dev_id)
         /* This calls activate_fd, so it has to be outside the critical
          * section.
          */
-        maybe_sigio_broken(fd, type);
+        maybe_sigio_broken(fd, (type == IRQ_READ));
 
         return(0);
 
@@ -318,7 +305,7 @@ void reactivate_fd(int fd, int irqnum)
         /* This calls activate_fd, so it has to be outside the critical
          * section.
          */
-        maybe_sigio_broken(fd, irq->type);
+        maybe_sigio_broken(fd, (irq->type == IRQ_READ));
 }
 
 void deactivate_fd(int fd, int irqnum)
diff --git a/arch/um/os-Linux/irq.c b/arch/um/os-Linux/irq.c
index 64c114b02701..7555bf9c33d9 100644
--- a/arch/um/os-Linux/irq.c
+++ b/arch/um/os-Linux/irq.c
@@ -52,11 +52,6 @@ int os_waiting_for_events(struct irq_fd *active_fds)
         return n;
 }
 
-int os_isatty(int fd)
-{
-        return isatty(fd);
-}
-
 int os_create_pollfd(int fd, int events, void *tmp_pfd, int size_tmpfds)
 {
         if (pollfds_num == pollfds_size) {
diff --git a/arch/um/os-Linux/sigio.c b/arch/um/os-Linux/sigio.c
index 00e9388e947a..0d2422a7d72c 100644
--- a/arch/um/os-Linux/sigio.c
+++ b/arch/um/os-Linux/sigio.c
@@ -233,7 +233,7 @@ static struct pollfd *setup_initial_poll(int fd)
         return p;
 }
 
-void write_sigio_workaround(void)
+static void write_sigio_workaround(void)
 {
         unsigned long stack;
         struct pollfd *p;
@@ -314,6 +314,18 @@ out_close1:
         close(l_write_sigio_fds[1]);
 }
 
+void maybe_sigio_broken(int fd, int read)
+{
+        if(!isatty(fd))
+                return;
+
+        if((read || pty_output_sigio) && (!read || pty_close_sigio))
+                return;
+
+        write_sigio_workaround();
+        add_sigio_fd(fd, read);
+}
+
 void sigio_cleanup(void)
 {
         if(write_sigio_pid != -1){