[PATCH] uml: Lots of little fixes by Jeff Dike.

From: Jeff Dike <jdike@addtoit.com>

This is a large set of small fixes and other changes:

Fixed a file descriptor leak in the network driver when changing an IP
address.

The port channel now sets SO_REUSEADDR.

Added some initcall and exitcall definitions to arch/um/include/init.h
so that they can be used from userspace code.

Fixed the error handling in run_helper.

Added the log() facility to mem_user.c.

Fixed a problem with recursive segfaults not being handled correctly.

tty_log_fd and umid aren't added to the command line any more.

Fixed some prints.
Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade_spam@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/um/drivers/port_user.c

@@ -123,12 +123,18 @@ struct chan_ops port_ops = {
 int port_listen_fd(int port)
 {
 	struct sockaddr_in addr;
-	int fd, err;
+	int fd, err, arg;
 
 	fd = socket(PF_INET, SOCK_STREAM, 0);
 	if(fd == -1) 
 		return(-errno);
 
+	arg = 1;
+	if(setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &arg, sizeof(arg)) < 0){
+		err = -errno;
+		goto out;
+	}
+
 	addr.sin_family = AF_INET;
 	addr.sin_port = htons(port);
 	addr.sin_addr.s_addr = htonl(INADDR_ANY);

arch/um/kernel/mem_user.c

@@ -228,6 +228,39 @@ int protect_memory(unsigned long addr, unsigned long len, int r, int w, int x,
 	return(0);
 }
 
+#if 0
+/* Debugging facility for dumping stuff out to the host, avoiding the timing
+ * problems that come with printf and breakpoints.
+ * Enable in case of emergency.
+ */
+
+int logging = 1;
+int logging_fd = -1;
+
+int logging_line = 0;
+char logging_buf[512];
+
+void log(char *fmt, ...)
+{
+        va_list ap;
+        struct timeval tv;
+        struct openflags flags;
+
+        if(logging == 0) return;
+        if(logging_fd < 0){
+                flags = of_create(of_trunc(of_rdwr(OPENFLAGS())));
+                logging_fd = os_open_file("log", flags, 0644);
+        }
+        gettimeofday(&tv, NULL);
+        sprintf(logging_buf, "%d\t %u.%u  ", logging_line++, tv.tv_sec,
+                tv.tv_usec);
+        va_start(ap, fmt);
+        vsprintf(&logging_buf[strlen(logging_buf)], fmt, ap);
+        va_end(ap);
+        write(logging_fd, logging_buf, strlen(logging_buf));
+}
+#endif
+
 /*
  * Overrides for Emacs so that we follow Linus's tabbing style.
  * Emacs will notice this stuff at the end of the file and automatically

arch/um/kernel/skas/include/mode-skas.h

@@ -6,6 +6,8 @@
 #ifndef __MODE_SKAS_H__
 #define __MODE_SKAS_H__
 
+#include <sysdep/ptrace.h>
+
 extern unsigned long exec_regs[];
 extern unsigned long exec_fp_regs[];
 extern unsigned long exec_fpx_regs[];

arch/um/kernel/tt/trap_user.c

@@ -23,6 +23,13 @@ void sig_handler_common_tt(int sig, void *sc_ptr)
 
 	unprotect_kernel_mem();
 
+	/* This is done because to allow SIGSEGV to be delivered inside a SEGV
+	 * handler.  This can happen in copy_user, and if SEGV is disabled,
+	 * the process will die.
+	 */
+	if(sig == SIGSEGV)
+		change_sig(SIGSEGV, 1);
+
 	/* This is done because to allow SIGSEGV to be delivered inside a SEGV
 	 * handler.  This can happen in copy_user, and if SEGV is disabled,
 	 * the process will die.

arch/um/kernel/tty_log.c

@@ -205,6 +205,8 @@ static int __init set_tty_log_fd(char *name, int *add)
 		printf("set_tty_log_fd - strtoul failed on '%s'\n", name);
 		tty_log_fd = -1;
 	}
+
+	*add = 0;
 	return 0;
 }
 

arch/um/kernel/umid.c

@@ -54,6 +54,7 @@ static int __init set_umid(char *name, int is_random,
 
 static int __init set_umid_arg(char *name, int *add)
 {
+	*add = 0;
 	return(set_umid(name, 0, printf));
 }
 

arch/um/os-Linux/file.c

@@ -308,7 +308,8 @@ int os_seek_file(int fd, __u64 offset)
 	__u64 actual;
 
 	actual = lseek64(fd, offset, SEEK_SET);
-	if(actual != offset) return(-errno);
+	if(actual != offset)
+		return(-errno);
 	return(0);
 }