Add forkpty function

Change-Id: I2eaac8c2c5c50f870a5a56806d0fd19dc5f386a1

3 files changed, 106 insertions, 1 deletions

diff --git a/jni/Android.mk b/jni/Android.mk
index 3c8e5f3..808b4c4 100644
--- a/jni/Android.mk
+++ b/jni/Android.mk
@@ -4,7 +4,8 @@ include $(CLEAR_VARS)
 
 LOCAL_SRC_FILES := \
     jni_init.cpp \
-    com_android_terminal_Terminal.cpp
+    com_android_terminal_Terminal.cpp \
+	forkpty.cpp
 
 LOCAL_C_INCLUDES += \
     external/libvterm/include \
diff --git a/jni/forkpty.cpp b/jni/forkpty.cpp
new file mode 100644
index 0000000..7feb307
--- /dev/null
+++ b/jni/forkpty.cpp
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "forkpty"
+
+#include <utils/Log.h>
+
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/ioctl.h>
+#include <termios.h>
+#include <unistd.h>
+
+#include "forkpty.h"
+
+pid_t forkpty(int *master, int *slave, const struct termios *termp,
+        const struct winsize *winp) {
+    int ptm = open("/dev/ptmx", O_RDWR);
+    if (ptm < 0) {
+        ALOGE("cannot open /dev/ptmx - %s", strerror(errno));
+        return -1;
+    }
+    fcntl(ptm, F_SETFD, FD_CLOEXEC);
+
+    char *devname;
+    if (grantpt(ptm) || unlockpt(ptm) || ((devname = (char *) ptsname(ptm)) == 0)) {
+        ALOGE("error opening pty - %s", strerror(errno));
+        return -1;
+    }
+
+    int pts = open(devname, O_RDWR);
+    if (pts < 0) {
+        ALOGE("unable to open slave pty - %s", strerror(errno));
+        return -1;
+    }
+
+    if (termp) {
+        tcsetattr(pts, TCSAFLUSH, termp);
+    }
+
+    if (winp) {
+        ioctl(pts, TIOCSWINSZ, winp);
+    }
+
+    pid_t pid = fork();
+
+    if (pid < 0) {
+        ALOGE("fork failed - %s", strerror(errno));
+        return -1;
+    }
+
+    if (pid == 0) {
+        setsid();
+        if (ioctl(pts, TIOCSCTTY, (char *)NULL) == -1) exit(-1);
+        dup2(pts, STDIN_FILENO);
+        dup2(pts, STDOUT_FILENO);
+        dup2(pts, STDERR_FILENO);
+        if (pts > 2) {
+            close(pts);
+        }
+    } else {
+        *master = ptm;
+        if (slave) {
+            *slave = pts;
+        }
+    }
+    return pid;
+}
+
diff --git a/jni/forkpty.h b/jni/forkpty.h
new file mode 100644
index 0000000..6b4da38
--- /dev/null
+++ b/jni/forkpty.h
@@ -0,0 +1,21 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <termios.h>
+#include <unistd.h>
+
+pid_t forkpty(int *master, int *slave, const struct termios *termp,
+        const struct winsize *winp);