1 files changed, 93 insertions, 0 deletions

diff --git a/arch/um/drivers/xterm_kern.c b/arch/um/drivers/xterm_kern.c
new file mode 100644
index 000000000000..7917b9d1cec8
--- /dev/null
+++ b/arch/um/drivers/xterm_kern.c
@@ -0,0 +1,93 @@
+/* 
+ * Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
+ * Licensed under the GPL
+ */
+
+#include "linux/errno.h"
+#include "linux/slab.h"
+#include "linux/signal.h"
+#include "linux/interrupt.h"
+#include "asm/semaphore.h"
+#include "asm/irq.h"
+#include "irq_user.h"
+#include "irq_kern.h"
+#include "kern_util.h"
+#include "os.h"
+#include "xterm.h"
+
+struct xterm_wait {
+        struct completion ready;
+        int fd;
+        int pid;
+        int new_fd;
+};
+
+static irqreturn_t xterm_interrupt(int irq, void *data, struct pt_regs *regs)
+{
+        struct xterm_wait *xterm = data;
+        int fd;
+
+        fd = os_rcv_fd(xterm->fd, &xterm->pid);
+        if(fd == -EAGAIN)
+                return(IRQ_NONE);
+
+        xterm->new_fd = fd;
+        complete(&xterm->ready);
+        return(IRQ_HANDLED);
+}
+
+int xterm_fd(int socket, int *pid_out)
+{
+        struct xterm_wait *data;
+        int err, ret;
+
+        data = kmalloc(sizeof(*data), GFP_KERNEL);
+        if(data == NULL){
+                printk(KERN_ERR "xterm_fd : failed to allocate xterm_wait\n");
+                return(-ENOMEM);
+        }
+
+        /* This is a locked semaphore... */
+        *data = ((struct xterm_wait) 
+                { .fd           = socket,
+                  .pid          = -1,
+                  .new_fd       = -1 });
+        init_completion(&data->ready);
+
+        err = um_request_irq(XTERM_IRQ, socket, IRQ_READ, xterm_interrupt, 
+                             SA_INTERRUPT | SA_SHIRQ | SA_SAMPLE_RANDOM, 
+                             "xterm", data);
+        if (err){
+                printk(KERN_ERR "xterm_fd : failed to get IRQ for xterm, "
+                       "err = %d\n",  err);
+                ret = err;
+                goto out;
+        }
+
+        /* ... so here we wait for an xterm interrupt.
+         *
+         * XXX Note, if the xterm doesn't work for some reason (eg. DISPLAY
+         * isn't set) this will hang... */
+        wait_for_completion(&data->ready);
+
+        free_irq_by_irq_and_dev(XTERM_IRQ, data);
+        free_irq(XTERM_IRQ, data);
+
+        ret = data->new_fd;
+        *pid_out = data->pid;
+ out:
+        kfree(data);
+
+        return(ret);
+}
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only.  This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */