1 files changed, 201 insertions, 0 deletions

diff --git a/arch/um/drivers/slirp_user.c b/arch/um/drivers/slirp_user.c
new file mode 100644
index 000000000000..c322515c71cc
--- /dev/null
+++ b/arch/um/drivers/slirp_user.c
@@ -0,0 +1,201 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stddef.h>
+#include <sched.h>
+#include <string.h>
+#include <errno.h>
+#include <sys/wait.h>
+#include <sys/signal.h>
+#include "user_util.h"
+#include "kern_util.h"
+#include "user.h"
+#include "net_user.h"
+#include "slirp.h"
+#include "slip_proto.h"
+#include "helper.h"
+#include "os.h"
+
+void slirp_user_init(void *data, void *dev)
+{
+	struct slirp_data *pri = data;
+
+	pri->dev = dev;
+}
+
+struct slirp_pre_exec_data {
+	int stdin;
+	int stdout;
+};
+
+static void slirp_pre_exec(void *arg)
+{
+	struct slirp_pre_exec_data *data = arg;
+
+	if(data->stdin != -1) dup2(data->stdin, 0);
+	if(data->stdout != -1) dup2(data->stdout, 1);
+}
+
+static int slirp_tramp(char **argv, int fd)
+{
+	struct slirp_pre_exec_data pe_data;
+	int pid;
+
+	pe_data.stdin = fd;
+	pe_data.stdout = fd;
+	pid = run_helper(slirp_pre_exec, &pe_data, argv, NULL);
+
+	return(pid);
+}
+
+/* XXX This is just a trivial wrapper around os_pipe */
+static int slirp_datachan(int *mfd, int *sfd)
+{
+	int fds[2], err;
+
+	err = os_pipe(fds, 1, 1);
+	if(err < 0){
+		printk("slirp_datachan: Failed to open pipe, err = %d\n", -err);
+		return(err);
+	}
+
+	*mfd = fds[0];
+	*sfd = fds[1];
+	return(0);
+}
+
+static int slirp_open(void *data)
+{
+	struct slirp_data *pri = data;
+	int sfd, mfd, pid, err;
+
+	err = slirp_datachan(&mfd, &sfd);
+	if(err)
+		return(err);
+
+	pid = slirp_tramp(pri->argw.argv, sfd);
+
+	if(pid < 0){
+		printk("slirp_tramp failed - errno = %d\n", -pid);
+		os_close_file(sfd);	
+		os_close_file(mfd);	
+		return(pid);
+	}
+
+	pri->slave = sfd;
+	pri->pos = 0;
+	pri->esc = 0;
+
+	pri->pid = pid;
+
+	return(mfd);
+}
+
+static void slirp_close(int fd, void *data)
+{
+	struct slirp_data *pri = data;
+	int status,err;
+
+	os_close_file(fd);
+	os_close_file(pri->slave);
+
+	pri->slave = -1;
+
+	if(pri->pid<1) {
+		printk("slirp_close: no child process to shut down\n");
+		return;
+	}
+
+#if 0
+	if(kill(pri->pid, SIGHUP)<0) {
+		printk("slirp_close: sending hangup to %d failed (%d)\n",
+			pri->pid, errno);
+	}
+#endif
+
+	CATCH_EINTR(err = waitpid(pri->pid, &status, WNOHANG));
+	if(err < 0) {
+		printk("slirp_close: waitpid returned %d\n", errno);
+		return;
+	}
+
+	if(err == 0) {
+		printk("slirp_close: process %d has not exited\n");
+		return;
+	}
+
+	pri->pid = -1;
+}
+
+int slirp_user_read(int fd, void *buf, int len, struct slirp_data *pri)
+{
+	int i, n, size, start;
+
+	if(pri->more>0) {
+		i = 0;
+		while(i < pri->more) {
+			size = slip_unesc(pri->ibuf[i++],
+					pri->ibuf,&pri->pos,&pri->esc);
+			if(size){
+				memcpy(buf, pri->ibuf, size);
+				memmove(pri->ibuf, &pri->ibuf[i], pri->more-i);
+				pri->more=pri->more-i; 
+				return(size);
+			}
+		}
+		pri->more=0;
+	}
+
+	n = net_read(fd, &pri->ibuf[pri->pos], sizeof(pri->ibuf) - pri->pos);
+	if(n <= 0) return(n);
+
+	start = pri->pos;
+	for(i = 0; i < n; i++){
+		size = slip_unesc(pri->ibuf[start + i],
+				pri->ibuf,&pri->pos,&pri->esc);
+		if(size){
+			memcpy(buf, pri->ibuf, size);
+			memmove(pri->ibuf, &pri->ibuf[start+i+1], n-(i+1));
+			pri->more=n-(i+1); 
+			return(size);
+		}
+	}
+	return(0);
+}
+
+int slirp_user_write(int fd, void *buf, int len, struct slirp_data *pri)
+{
+	int actual, n;
+
+	actual = slip_esc(buf, pri->obuf, len);
+	n = net_write(fd, pri->obuf, actual);
+	if(n < 0) return(n);
+	else return(len);
+}
+
+static int slirp_set_mtu(int mtu, void *data)
+{
+	return(mtu);
+}
+
+struct net_user_info slirp_user_info = {
+	.init		= slirp_user_init,
+	.open		= slirp_open,
+	.close	 	= slirp_close,
+	.remove	 	= NULL,
+	.set_mtu	= slirp_set_mtu,
+	.add_address	= NULL,
+	.delete_address = NULL,
+	.max_packet	= BUF_SIZE
+};
+
+/*
+ * 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:
+ */