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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/um/drivers/slirp_user.c
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/um/drivers/slirp_user.c')
-rw-r--r--arch/um/drivers/slirp_user.c201
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 00000000000..c322515c71c
--- /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:
+ */