uml: tidy recently-moved code

Now that the generic console operations are in a userspace file, we
can do the following:
	directly call into libc instead of through the os_* wrappers
	eliminate os_window_size since it has only one user

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

3 files changed, 15 insertions, 29 deletions

diff --git a/arch/um/drivers/chan_user.c b/arch/um/drivers/chan_user.c
index 249c877410d7..40271afa3ee2 100644
--- a/arch/um/drivers/chan_user.c
+++ b/arch/um/drivers/chan_user.c
@@ -23,43 +23,43 @@
 
 void generic_close(int fd, void *unused)
 {
-        os_close_file(fd);
+        close(fd);
 }
 
 int generic_read(int fd, char *c_out, void *unused)
 {
         int n;
 
-        n = os_read_file(fd, c_out, sizeof(*c_out));
-
-        if(n == -EAGAIN)
+        n = read(fd, c_out, sizeof(*c_out));
+        if (n > 0)
+                return n;
+        else if (errno == EAGAIN)
                 return 0;
-        else if(n == 0)
+        else if (n == 0)
                 return -EIO;
-        return n;
+        return -errno;
 }
 
-/* XXX Trivial wrapper around os_write_file */
+/* XXX Trivial wrapper around write */
 
 int generic_write(int fd, const char *buf, int n, void *unused)
 {
-        return os_write_file(fd, buf, n);
+        return write(fd, buf, n);
 }
 
 int generic_window_size(int fd, void *unused, unsigned short *rows_out,
                         unsigned short *cols_out)
 {
-        int rows, cols;
+        struct winsize size;
         int ret;
 
-        ret = os_window_size(fd, &rows, &cols);
-        if(ret < 0)
-                return ret;
+        if(ioctl(fd, TIOCGWINSZ, &size) < 0)
+                return -errno;
 
-        ret = ((*rows_out != rows) || (*cols_out != cols));
+        ret = ((*rows_out != size.ws_row) || (*cols_out != size.ws_col));
 
-        *rows_out = rows;
-        *cols_out = cols;
+        *rows_out = size.ws_row;
+        *cols_out = size.ws_col;
 
         return ret;
 }
diff --git a/arch/um/include/os.h b/arch/um/include/os.h
index 930b261ea483..bb6b7d9e1888 100644
--- a/arch/um/include/os.h
+++ b/arch/um/include/os.h
@@ -134,7 +134,6 @@ extern void os_print_error(int error, const char* str);
 extern int os_get_exec_close(int fd, int *close_on_exec);
 extern int os_set_exec_close(int fd, int close_on_exec);
 extern int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg);
-extern int os_window_size(int fd, int *rows, int *cols);
 extern int os_new_tty_pgrp(int fd, int pid);
 extern int os_get_ifname(int fd, char *namebuf);
 extern int os_set_slip(int fd);
diff --git a/arch/um/os-Linux/file.c b/arch/um/os-Linux/file.c
index c3ecc2a84e0c..f52006ee70e8 100644
--- a/arch/um/os-Linux/file.c
+++ b/arch/um/os-Linux/file.c
@@ -101,19 +101,6 @@ int os_ioctl_generic(int fd, unsigned int cmd, unsigned long arg)
         return err;
 }
 
-int os_window_size(int fd, int *rows, int *cols)
-{
-        struct winsize size;
-
-        if(ioctl(fd, TIOCGWINSZ, &size) < 0)
-                return -errno;
-
-        *rows = size.ws_row;
-        *cols = size.ws_col;
-
-        return 0;
-}
-
 int os_new_tty_pgrp(int fd, int pid)
 {
         if(ioctl(fd, TIOCSCTTY, 0) < 0)