From 6beb7818efb57851a042953937af72163f1bde6c Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Wed, 9 Apr 2014 00:11:10 -0400
Subject: spawn a shell process and run it on a pty

not at all convinced that this is correct, but it at least does things
---
 Makefile   |  2 +-
 events.c   |  2 +-
 pty-unix.c | 91 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 pty-unix.h | 23 ++++++++++++++++
 runes.h    |  3 +++
 term.c     |  5 ++++
 term.h     |  1 +
 7 files changed, 125 insertions(+), 2 deletions(-)
 create mode 100644 pty-unix.c
 create mode 100644 pty-unix.h

diff --git a/Makefile b/Makefile
index edbc068..397dd7f 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 OUT      = runes
-OBJ      = runes.o display.o term.o events.o window-xlib.o
+OBJ      = runes.o display.o term.o events.o window-xlib.o pty-unix.o
 LIBS     = cairo cairo-xlib libuv
 CFLAGS  ?= -g -Wall -Wextra -Werror
 LDFLAGS ?= -g -Wall -Wextra -Werror
diff --git a/events.c b/events.c
index 7112b17..e721518 100644
--- a/events.c
+++ b/events.c
@@ -2,7 +2,7 @@
 
 void runes_handle_keyboard_event(RunesTerm *t, char *buf, size_t len)
 {
-    runes_display_glyph(t, buf, len);
+    runes_pty_backend_write(t, buf, len);
 }
 
 void runes_handle_close_window(RunesTerm *t)
diff --git a/pty-unix.c b/pty-unix.c
new file mode 100644
index 0000000..71fde3a
--- /dev/null
+++ b/pty-unix.c
@@ -0,0 +1,91 @@
+#define _XOPEN_SOURCE 600
+#include <fcntl.h>
+#include <stdlib.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+
+#include "runes.h"
+
+void runes_pty_backend_init(RunesTerm *t)
+{
+    RunesPtyBackend *pty;
+
+    pty = &t->pty;
+    pty->master = posix_openpt(O_RDWR);
+    grantpt(pty->master);
+    unlockpt(pty->master);
+    pty->slave = open(ptsname(pty->master), O_RDWR);
+
+    pty->child_pid = fork();
+    if (pty->child_pid) {
+        close(pty->slave);
+        pty->slave = -1;
+    }
+    else {
+        char *shell;
+
+        setsid();
+        ioctl(pty->slave, TIOCSCTTY, NULL);
+
+        close(pty->master);
+
+        dup2(pty->slave, 0);
+        dup2(pty->slave, 1);
+        dup2(pty->slave, 2);
+
+        close(pty->slave);
+
+        shell = getenv("SHELL");
+        if (!shell) {
+            shell = "/bin/sh";
+        }
+
+        execl(shell, shell, (char *)NULL);
+    }
+}
+
+static void runes_read_pty(uv_work_t *req)
+{
+    RunesPtyLoopData *data;
+
+    data = (RunesPtyLoopData *)req->data;
+    data->len = read(data->data.t->pty.master, data->buf, RUNES_PTY_BUFFER_LENGTH);
+}
+
+static void runes_got_pty_data(uv_work_t *req, int status)
+{
+    RunesTerm *t;
+    RunesPtyLoopData *data;
+
+    UNUSED(status);
+    data = (RunesPtyLoopData *)req->data;
+    t = data->data.t;
+
+    runes_display_glyph(data->data.t, data->buf, data->len);
+
+    uv_queue_work(t->loop, req, runes_read_pty, runes_got_pty_data);
+}
+
+void runes_pty_backend_loop_init(RunesTerm *t)
+{
+    void *data;
+
+    data = malloc(sizeof(RunesPtyLoopData));
+    ((RunesLoopData *)data)->req.data = data;
+    ((RunesLoopData *)data)->t = t;
+
+    uv_queue_work(t->loop, data, runes_read_pty, runes_got_pty_data);
+}
+
+void runes_pty_backend_write(RunesTerm *t, char *buf, size_t len)
+{
+    write(t->pty.master, buf, len);
+}
+
+void runes_pty_backend_cleanup(RunesTerm *t)
+{
+    RunesPtyBackend *pty;
+
+    pty = &t->pty;
+    close(pty->master);
+}
diff --git a/pty-unix.h b/pty-unix.h
new file mode 100644
index 0000000..ab5acc2
--- /dev/null
+++ b/pty-unix.h
@@ -0,0 +1,23 @@
+#ifndef _RUNES_PTY_H
+#define _RUNES_PTY_H
+
+#define RUNES_PTY_BUFFER_LENGTH 4096
+
+struct runes_pty {
+    int master;
+    int slave;
+    pid_t child_pid;
+};
+
+typedef struct {
+    RunesLoopData data;
+    size_t len;
+    char buf[RUNES_PTY_BUFFER_LENGTH];
+} RunesPtyLoopData;
+
+void runes_pty_backend_init(RunesTerm *t);
+void runes_pty_backend_loop_init(RunesTerm *t);
+void runes_pty_backend_write(RunesTerm *t, char *buf, size_t len);
+void runes_pty_backend_cleanup(RunesTerm *t);
+
+#endif
diff --git a/runes.h b/runes.h
index bf51186..9b90b84 100644
--- a/runes.h
+++ b/runes.h
@@ -6,15 +6,18 @@
 
 struct runes_term;
 struct runes_window;
+struct runes_pty;
 struct runes_loop_data;
 
 typedef struct runes_term RunesTerm;
 typedef struct runes_window RunesWindowBackend;
+typedef struct runes_pty RunesPtyBackend;
 typedef struct runes_loop_data RunesLoopData;
 
 #include "events.h"
 
 #include "window-xlib.h"
+#include "pty-unix.h"
 
 #include "term.h"
 #include "display.h"
diff --git a/term.c b/term.c
index 1335678..bf1f078 100644
--- a/term.c
+++ b/term.c
@@ -4,8 +4,12 @@
 
 void runes_term_init(RunesTerm *t, int argc, char *argv[])
 {
+    runes_pty_backend_init(t);
+
     t->loop = uv_default_loop();
 
+    runes_pty_backend_loop_init(t);
+
     runes_window_backend_init(t, argc, argv);
     t->cr = cairo_create(runes_window_backend_surface_create(t));
 }
@@ -14,4 +18,5 @@ void runes_term_cleanup(RunesTerm *t)
 {
     cairo_destroy(t->cr);
     runes_window_backend_cleanup(t);
+    runes_pty_backend_cleanup(t);
 }
diff --git a/term.h b/term.h
index dc00387..3993edf 100644
--- a/term.h
+++ b/term.h
@@ -3,6 +3,7 @@
 
 struct runes_term {
     RunesWindowBackend w;
+    RunesPtyBackend pty;
 
     cairo_t *cr;
     uv_loop_t *loop;
-- 
cgit v1.2.3-54-g00ecf