uml: miscellaneous code cleanups

Code tidying -
	the pid field of struct irq_fd isn't used, so it is removed
     	os_set_fd_async needed to read flags before changing them, it
doesn't need a pid passed in because it can call getpid itself, and a
block of unused code needed deleting
	os_get_exec_close was unused, so it is removed
	ptrace_child called _exit for historical reasons which are no
longer valid, so just calls exit instead

Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

2 files changed, 13 insertions, 28 deletions

diff --git a/arch/um/os-Linux/file.c b/arch/um/os-Linux/file.c
index 9387cb1..4f547d7 100644
--- a/arch/um/os-Linux/file.c
+++ b/arch/um/os-Linux/file.c
@@ -328,19 +328,6 @@ int os_file_modtime(const char *file, unsigned long *modtime)
 	return 0;
 }
 
-int os_get_exec_close(int fd, int *close_on_exec)
-{
-	int ret;
-
-	CATCH_EINTR(ret = fcntl(fd, F_GETFD));
-
-	if(ret < 0)
-		return -errno;
-
-	*close_on_exec = (ret & FD_CLOEXEC) ? 1 : 0;
-	return ret;
-}
-
 int os_set_exec_close(int fd)
 {
 	int err;
@@ -380,30 +367,27 @@ int os_pipe(int *fds, int stream, int close_on_exec)
 	return err;
 }
 
-int os_set_fd_async(int fd, int owner)
+int os_set_fd_async(int fd)
 {
-	int err;
+	int err, flags;
+
+	flags = fcntl(fd, F_GETFL);
+	if (flags < 0)
+		return -errno;
 
-	/* XXX This should do F_GETFL first */
-	if(fcntl(fd, F_SETFL, O_ASYNC | O_NONBLOCK) < 0){
+	flags |= O_ASYNC | O_NONBLOCK;
+	if (fcntl(fd, F_SETFL, flags) < 0) {
 		err = -errno;
 		printk("os_set_fd_async : failed to set O_ASYNC and "
 		       "O_NONBLOCK on fd # %d, errno = %d\n", fd, errno);
 		return err;
 	}
-#ifdef notdef
-	if(fcntl(fd, F_SETFD, 1) < 0){
-		printk("os_set_fd_async : Setting FD_CLOEXEC failed, "
-		       "errno = %d\n", errno);
-	}
-#endif
 
-	if((fcntl(fd, F_SETSIG, SIGIO) < 0) ||
-	   (fcntl(fd, F_SETOWN, owner) < 0)){
+	if ((fcntl(fd, F_SETSIG, SIGIO) < 0) ||
+	    (fcntl(fd, F_SETOWN, os_getpid()) < 0)) {
 		err = -errno;
 		printk("os_set_fd_async : Failed to fcntl F_SETOWN "
-		       "(or F_SETSIG) fd %d to pid %d, errno = %d\n", fd,
-		       owner, errno);
+		       "(or F_SETSIG) fd %d, errno = %d\n", fd, errno);
 		return err;
 	}
 
diff --git a/arch/um/os-Linux/start_up.c b/arch/um/os-Linux/start_up.c
index 6d56d15..bcf0c9b 100644
--- a/arch/um/os-Linux/start_up.c
+++ b/arch/um/os-Linux/start_up.c
@@ -60,7 +60,8 @@ static int ptrace_child(void)
 		 * the UML code itself.
 		 */
 		ret = 2;
-	_exit(ret);
+
+	exit(ret);
 }
 
 static void fatal_perror(const char *str)