A number of small fixes.

The port and xterm drivers handle -EAGAIN from os_rcv_fd gracefully,
fixing a crash in the xterm driver.
The ubd driver handles devfs_register failures better.
More symbols were exported.

arch/um/Makefile

 ARCH_DIR = arch/um
 OS := $(shell uname -s)
 
-EXTRAVERSION := $(EXTRAVERSION)-1um
+EXTRAVERSION := $(EXTRAVERSION)-3um
 include/linux/version.h: arch/$(ARCH)/Makefile
 
 # Recalculate MODLIB to reflect the EXTRAVERSION changes (via KERNELRELEASE)

arch/um/drivers/Makefile

@@ -15,7 +15,7 @@ CHAN_OBJS := chan_kern.o chan_user.o line.o
 # So, what this does is figure out by hand (crudely) what file -lpcap really 
 # is and just use it.
 
-PCAP = $(shell for f in echo {/lib,/usr/lib}/libpcap.{a,so}; do \
+PCAP = $(shell for f in echo {/lib,/usr/lib}/libpcap.a; do \
        [ -f $$f ] && echo $$f ; done | head -1)
 
 slip-objs := slip_kern.o slip_user.o

arch/um/drivers/port_kern.c

@@ -50,13 +50,17 @@ static void pipe_interrupt(int irq, void *data, struct pt_regs *regs)
 	struct connection *conn = data;
 	int fd;
 
-	list_del(&conn->list);
-
  	fd = os_rcv_fd(conn->socket[0], &conn->helper_pid);
 	if(fd < 0){
+		if(fd == -EAGAIN)
+			return;
+
 		printk("os_rcv_fd returned %d\n", -fd);
 		os_close_file(conn->fd);
 	}
+
+	list_del(&conn->list);
+
 	conn->fd = fd;
 	list_add(&conn->list, &conn->port->connections);
 

arch/um/drivers/ubd_kern.c

@@ -423,7 +423,6 @@ devfs_handle_t ubd_fake_dir_handle;
 
 static int ubd_add(int n)
 {
- 	devfs_handle_t real, fake;
 	char name[sizeof("nnnnnn\0")];
 	struct ubd *dev = &ubd_dev[n];
 	struct gendisk *disk, *fake_disk = NULL;
@@ -465,24 +464,18 @@ static int ubd_add(int n)
 	}
  
 	sprintf(name, "%d", n);
-	real = devfs_register(ubd_dir_handle, name, DEVFS_FL_REMOVABLE, 
-			      MAJOR_NR, n << UBD_SHIFT,
-			      S_IFBLK | S_IRUSR | S_IWUSR | S_IRGRP |S_IWGRP,
-			      &ubd_blops, NULL);
- 	if(real == NULL) 
- 		goto out;
- 	ubd_dev[n].real = real;
+	dev->real = devfs_register(ubd_dir_handle, name, DEVFS_FL_REMOVABLE, 
+				   MAJOR_NR, n << UBD_SHIFT, S_IFBLK | 
+				   S_IRUSR | S_IWUSR | S_IRGRP |S_IWGRP,
+				   &ubd_blops, NULL);
 
 	if (fake_major) {
-		fake = devfs_register(ubd_fake_dir_handle, name, 
-				      DEVFS_FL_REMOVABLE, fake_major,
-				      n << UBD_SHIFT, 
-				      S_IFBLK | S_IRUSR | S_IWUSR | S_IRGRP |
-				      S_IWGRP, &ubd_blops, NULL);
- 		if(fake == NULL)
-			goto out_unregister;
-
- 		ubd_dev[n].fake = fake;
+		dev->fake = devfs_register(ubd_fake_dir_handle, name, 
+					   DEVFS_FL_REMOVABLE, fake_major,
+					   n << UBD_SHIFT, 
+					   S_IFBLK | S_IRUSR | S_IWUSR | 
+					   S_IRGRP | S_IWGRP, &ubd_blops,
+					   NULL);
 		add_disk(fake_disk);
 	}
  
@@ -490,9 +483,6 @@ static int ubd_add(int n)
 	make_ide_entries(disk->disk_name);
 	return(0);
 
- out_unregister:
-	devfs_unregister(real);
-	ubd_dev[n].real = NULL;
  out:
 	return(-1);
 }
@@ -700,11 +690,12 @@ static int ubd_open(struct inode *inode, struct file *filp)
 {
 	int n = DEVICE_NR(inode->i_rdev);
 	struct ubd *dev = &ubd_dev[n];
-	int err = 0;
+	int err = -EISDIR;
 
 	if(dev->is_dir == 1)
 		goto out;
 
+	err = 0;
 	if(dev->count == 0){
 		dev->openflags = dev->boot_openflags;
 

arch/um/drivers/xterm_kern.c

@@ -8,6 +8,7 @@
 #include "asm/semaphore.h"
 #include "asm/irq.h"
 #include "irq_user.h"
+#include "kern_util.h"
 #include "os.h"
 #include "xterm.h"
 
@@ -23,6 +24,9 @@ static void xterm_interrupt(int irq, void *data, struct pt_regs *regs)
 	struct xterm_wait *xterm = data;
 
 	xterm->new_fd = os_rcv_fd(xterm->fd, &xterm->pid);
+	if(xterm->new_fd == -EAGAIN)
+		return;
+
 	up(&xterm->sem);
 }
 
@@ -52,6 +56,8 @@ int xterm_fd(int socket, int *pid_out)
 	}
 	down(&data->sem);
 
+	free_irq(XTERM_IRQ, data);
+
 	ret = data->new_fd;
 	*pid_out = data->pid;
 	kfree(data);

arch/um/kernel/ksyms.c

@@ -39,12 +39,15 @@ EXPORT_SYMBOL(page_mem_map);
 EXPORT_SYMBOL(get_signals);
 EXPORT_SYMBOL(page_to_phys);
 EXPORT_SYMBOL(phys_to_page);
+EXPORT_SYMBOL(high_physmem);
 
 EXPORT_SYMBOL(os_open_file);
 EXPORT_SYMBOL(os_read_file);
 EXPORT_SYMBOL(os_write_file);
 EXPORT_SYMBOL(os_seek_file);
 EXPORT_SYMBOL(os_pipe);
+EXPORT_SYMBOL(os_file_type);
+EXPORT_SYMBOL(os_close_file);
 EXPORT_SYMBOL(helper_wait);
 EXPORT_SYMBOL(os_shutdown_socket);
 EXPORT_SYMBOL(os_connect_socket);
@@ -71,4 +74,6 @@ EXPORT_SYMBOL_NOVERS(__write_lock_failed);
 extern void FASTCALL( __read_lock_failed(rwlock_t *rw));
 EXPORT_SYMBOL_NOVERS(__read_lock_failed);
 
+EXPORT_SYMBOL(smp_num_cpus);
+
 #endif

arch/um/kernel/sysrq.c

@@ -76,6 +76,16 @@ void show_trace(unsigned long * stack)
         printk("\n");
 }
 
+/*
+ * The architecture-independent dump_stack generator
+ */
+void dump_stack(void)
+{
+	unsigned long stack;
+
+	show_trace(&stack);
+}
+
 void show_trace_task(struct task_struct *tsk)
 {
 	unsigned long esp = PT_REGS_SP(&tsk->thread.regs);

arch/um/os-Linux/file.c

@@ -283,10 +283,9 @@ int os_rcv_fd(int fd, int *helper_pid_out)
 	msg.msg_flags = 0;
 
 	n = recvmsg(fd, &msg, 0);
-	if(n < 0){
-		printk("rcv_fd : recvmsg failed - errno = %d\n", errno);
-		return(-1);
-	}
+	if(n < 0)
+		return(-errno);
+
 	else if(n != sizeof(iov.iov_len))
 		*helper_pid_out = -1;