diff --git a/adb/Android.mk b/adb/Android.mk
index b34a49f..543f1eb 100644
--- a/adb/Android.mk
+++ b/adb/Android.mk
@@ -129,6 +129,8 @@
 LOCAL_SRC_FILES := \
     $(LIBADB_TEST_SRCS) \
     $(LIBADB_TEST_linux_SRCS) \
+    shell_service_protocol.cpp \
+    shell_service_protocol_test.cpp \
 
 LOCAL_SANITIZE := $(adb_target_sanitize)
 LOCAL_STATIC_LIBRARIES := libadbd
@@ -143,7 +145,12 @@
 LOCAL_CFLAGS := -DADB_HOST=1 $(LIBADB_CFLAGS)
 LOCAL_CFLAGS_windows := $(LIBADB_windows_CFLAGS)
 LOCAL_CFLAGS_linux := $(LIBADB_linux_CFLAGS)
-LOCAL_SRC_FILES := $(LIBADB_TEST_SRCS) services.cpp
+LOCAL_SRC_FILES := \
+    $(LIBADB_TEST_SRCS) \
+    services.cpp \
+    shell_service_protocol.cpp \
+    shell_service_protocol_test.cpp \
+
 LOCAL_SRC_FILES_linux := $(LIBADB_TEST_linux_SRCS)
 LOCAL_SRC_FILES_darwin := $(LIBADB_TEST_darwin_SRCS)
 LOCAL_SANITIZE := $(adb_host_sanitize)
@@ -199,6 +206,7 @@
     adb_client.cpp \
     services.cpp \
     file_sync_client.cpp \
+    shell_service_protocol.cpp \
 
 LOCAL_CFLAGS += \
     $(ADB_COMMON_CFLAGS) \
@@ -247,6 +255,7 @@
     remount_service.cpp \
     set_verity_enable_state_service.cpp \
     shell_service.cpp \
+    shell_service_protocol.cpp \
 
 LOCAL_CFLAGS := \
     $(ADB_COMMON_CFLAGS) \
diff --git a/adb/shell_service.h b/adb/shell_service.h
index c2a048c..81d7036 100644
--- a/adb/shell_service.h
+++ b/adb/shell_service.h
@@ -14,9 +14,109 @@
  * limitations under the License.
  */
 
+// This file contains classes and functionality to launch shell subprocesses
+// in adbd and communicate between those subprocesses and the adb client.
+//
+// The main features exposed here are:
+//   1. A ShellPacket class to wrap data in a simple protocol. Both adbd and
+//      the adb client use this class to transmit data between them.
+//   2. Functions to launch a subprocess on the adbd side.
+
 #ifndef SHELL_SERVICE_H_
 #define SHELL_SERVICE_H_
 
+#include <stdint.h>
+
+#include <base/macros.h>
+
+#include "adb.h"
+
+// Class to send and receive shell protocol packets.
+//
+// To keep things simple and predictable, reads and writes block until an entire
+// packet is complete.
+//
+// Example: read raw data from |fd| and send it in a packet.
+//   ShellProtocol* p = new ShellProtocol(protocol_fd);
+//   int len = adb_read(stdout_fd, p->data(), p->data_capacity());
+//   packet->WritePacket(ShellProtocol::kIdStdout, len);
+//
+// Example: read a packet and print it to |stdout|.
+//   ShellProtocol* p = new ShellProtocol(protocol_fd);
+//   if (p->ReadPacket() && p->id() == kIdStdout) {
+//       fwrite(p->data(), 1, p->data_length(), stdout);
+//   }
+class ShellProtocol {
+  public:
+    // This is an unscoped enum to make it easier to compare against raw bytes.
+    enum Id : uint8_t {
+        kIdStdin  = 0,
+        kIdStdout = 1,
+        kIdStderr = 2,
+        kIdExit   = 3,
+        kIdInvalid  = 255,  // Indicates an invalid or unknown packet.
+    };
+
+    // ShellPackets will probably be too large to allocate on the stack so they
+    // should be dynamically allocated on the heap instead.
+    //
+    // |fd| is an open file descriptor to be used to send or receive packets.
+    explicit ShellProtocol(int fd);
+    virtual ~ShellProtocol();
+
+    // Returns a pointer to the data buffer.
+    const char* data() const { return buffer_ + kHeaderSize; }
+    char* data() { return buffer_ + kHeaderSize; }
+
+    // Returns the total capacity of the data buffer.
+    size_t data_capacity() const { return buffer_end_ - data(); }
+
+    // Reads a packet from the FD.
+    //
+    // If a packet is too big to fit in the buffer then Read() will split the
+    // packet across multiple calls. For example, reading a 50-byte packet into
+    // a 20-byte buffer would read 20 bytes, 20 bytes, then 10 bytes.
+    //
+    // Returns false if the FD closed or errored.
+    bool Read();
+
+    // Returns the ID of the packet in the buffer.
+    int id() const { return buffer_[0]; }
+
+    // Returns the number of bytes that have been read into the data buffer.
+    size_t data_length() const { return data_length_; }
+
+    // Writes the packet currently in the buffer to the FD.
+    //
+    // Returns false if the FD closed or errored.
+    bool Write(Id id, size_t length);
+
+  private:
+    // Packets support 4-byte lengths.
+    typedef uint32_t length_t;
+
+    enum {
+        // It's OK if MAX_PAYLOAD doesn't match on the sending and receiving
+        // end, reading will split larger packets into multiple smaller ones.
+        kBufferSize = MAX_PAYLOAD,
+
+        // Header is 1 byte ID + 4 bytes length.
+        kHeaderSize = sizeof(Id) + sizeof(length_t)
+    };
+
+    int fd_;
+    char buffer_[kBufferSize];
+    size_t data_length_ = 0, bytes_left_ = 0;
+
+    // We need to be able to modify this value for testing purposes, but it
+    // will stay constant during actual program use.
+    char* buffer_end_ = buffer_ + sizeof(buffer_);
+
+    friend class ShellProtocolTest;
+
+    DISALLOW_COPY_AND_ASSIGN(ShellProtocol);
+};
+
 #if !ADB_HOST
 
 enum class SubprocessType {
diff --git a/adb/shell_service_protocol.cpp b/adb/shell_service_protocol.cpp
new file mode 100644
index 0000000..623629c
--- /dev/null
+++ b/adb/shell_service_protocol.cpp
@@ -0,0 +1,62 @@
+/*
+ * Copyright (C) 2015 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 "shell_service.h"
+
+#include <string.h>
+
+#include <algorithm>
+
+#include "adb_io.h"
+
+ShellProtocol::ShellProtocol(int fd) : fd_(fd) {
+    buffer_[0] = kIdInvalid;
+}
+
+ShellProtocol::~ShellProtocol() {
+}
+
+bool ShellProtocol::Read() {
+    // Only read a new header if we've finished the last packet.
+    if (!bytes_left_) {
+        if (!ReadFdExactly(fd_, buffer_, kHeaderSize)) {
+            return false;
+        }
+
+        length_t packet_length;
+        memcpy(&packet_length, &buffer_[1], sizeof(packet_length));
+        bytes_left_ = packet_length;
+        data_length_ = 0;
+    }
+
+    size_t read_length = std::min(bytes_left_, data_capacity());
+    if (read_length && !ReadFdExactly(fd_, data(), read_length)) {
+        return false;
+    }
+
+    bytes_left_ -= read_length;
+    data_length_ = read_length;
+
+    return true;
+}
+
+bool ShellProtocol::Write(Id id, size_t length) {
+    buffer_[0] = id;
+    length_t typed_length = length;
+    memcpy(&buffer_[1], &typed_length, sizeof(typed_length));
+
+    return WriteFdExactly(fd_, buffer_, kHeaderSize + length);
+}
diff --git a/adb/shell_service_protocol_test.cpp b/adb/shell_service_protocol_test.cpp
new file mode 100644
index 0000000..85b2f91
--- /dev/null
+++ b/adb/shell_service_protocol_test.cpp
@@ -0,0 +1,192 @@
+/*
+ * Copyright (C) 2015 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 "shell_service.h"
+
+#include <gtest/gtest.h>
+
+#include <signal.h>
+#include <string.h>
+
+#include "sysdeps.h"
+
+class ShellProtocolTest : public ::testing::Test {
+  public:
+    static void SetUpTestCase() {
+#if !defined(_WIN32)
+        // This is normally done in main.cpp.
+        saved_sigpipe_handler_ = signal(SIGPIPE, SIG_IGN);
+#endif
+    }
+
+    static void TearDownTestCase() {
+#if !defined(_WIN32)
+        signal(SIGPIPE, saved_sigpipe_handler_);
+#endif
+    }
+
+    // Initializes the socketpair and ShellProtocols needed for testing.
+    void SetUp() {
+        int fds[2];
+        ASSERT_EQ(0, adb_socketpair(fds));
+        read_fd_ = fds[0];
+        write_fd_ = fds[1];
+
+        write_protocol_ = new ShellProtocol(write_fd_);
+        ASSERT_TRUE(write_protocol_ != nullptr);
+
+        read_protocol_ = new ShellProtocol(read_fd_);
+        ASSERT_TRUE(read_protocol_ != nullptr);
+    }
+
+    // Cleans up FDs and ShellProtocols. If an FD is closed manually during a
+    // test, set it to -1 to prevent TearDown() trying to close it again.
+    void TearDown() {
+        for (int fd : {read_fd_, write_fd_}) {
+            if (fd >= 0) {
+                adb_close(fd);
+            }
+        }
+        for (ShellProtocol* protocol : {read_protocol_, write_protocol_}) {
+            if (protocol) {
+                delete protocol;
+            }
+        }
+    }
+
+    // Fakes the buffer size so we can test filling buffers.
+    void SetReadDataCapacity(size_t size) {
+        read_protocol_->buffer_end_ = read_protocol_->data() + size;
+    }
+
+    static sig_t saved_sigpipe_handler_;
+
+    int read_fd_ = -1, write_fd_ = -1;
+    ShellProtocol *read_protocol_ = nullptr, *write_protocol_ = nullptr;
+};
+
+sig_t ShellProtocolTest::saved_sigpipe_handler_ = nullptr;
+
+namespace {
+
+// Returns true if the packet contains the given values.
+bool PacketEquals(const ShellProtocol* protocol, ShellProtocol::Id id,
+                    const void* data, size_t data_length) {
+    return (protocol->id() == id &&
+            protocol->data_length() == data_length &&
+            !memcmp(data, protocol->data(), data_length));
+}
+
+}  // namespace
+
+// Tests data that can fit in a single packet.
+TEST_F(ShellProtocolTest, FullPacket) {
+    ShellProtocol::Id id = ShellProtocol::kIdStdout;
+    char data[] = "abc 123 \0\r\n";
+
+    memcpy(write_protocol_->data(), data, sizeof(data));
+    ASSERT_TRUE(write_protocol_->Write(id, sizeof(data)));
+
+    ASSERT_TRUE(read_protocol_->Read());
+    ASSERT_TRUE(PacketEquals(read_protocol_, id, data, sizeof(data)));
+}
+
+// Tests data that has to be read multiple times due to smaller read buffer.
+TEST_F(ShellProtocolTest, ReadBufferOverflow) {
+    ShellProtocol::Id id = ShellProtocol::kIdStdin;
+
+    memcpy(write_protocol_->data(), "1234567890", 10);
+    ASSERT_TRUE(write_protocol_->Write(id, 10));
+
+    SetReadDataCapacity(4);
+    ASSERT_TRUE(read_protocol_->Read());
+    ASSERT_TRUE(PacketEquals(read_protocol_, id, "1234", 4));
+    ASSERT_TRUE(read_protocol_->Read());
+    ASSERT_TRUE(PacketEquals(read_protocol_, id, "5678", 4));
+    ASSERT_TRUE(read_protocol_->Read());
+    ASSERT_TRUE(PacketEquals(read_protocol_, id, "90", 2));
+}
+
+// Tests a zero length packet.
+TEST_F(ShellProtocolTest, ZeroLengthPacket) {
+    ShellProtocol::Id id = ShellProtocol::kIdStderr;
+
+    ASSERT_TRUE(write_protocol_->Write(id, 0));
+    ASSERT_TRUE(read_protocol_->Read());
+    ASSERT_TRUE(PacketEquals(read_protocol_, id, nullptr, 0));
+}
+
+// Tests exit code packets.
+TEST_F(ShellProtocolTest, ExitCodePacket) {
+    write_protocol_->data()[0] = 20;
+    ASSERT_TRUE(write_protocol_->Write(ShellProtocol::kIdExit, 1));
+
+    ASSERT_TRUE(read_protocol_->Read());
+    ASSERT_EQ(ShellProtocol::kIdExit, read_protocol_->id());
+    ASSERT_EQ(20, read_protocol_->data()[0]);
+}
+
+// Tests writing to a closed pipe.
+TEST_F(ShellProtocolTest, WriteToClosedPipeFail) {
+    adb_close(read_fd_);
+    read_fd_ = -1;
+
+    ASSERT_FALSE(write_protocol_->Write(ShellProtocol::kIdStdout, 0));
+}
+
+// Tests writing to a closed FD.
+TEST_F(ShellProtocolTest, WriteToClosedFdFail) {
+    adb_close(write_fd_);
+    write_fd_ = -1;
+
+    ASSERT_FALSE(write_protocol_->Write(ShellProtocol::kIdStdout, 0));
+}
+
+// Tests reading from a closed pipe.
+TEST_F(ShellProtocolTest, ReadFromClosedPipeFail) {
+    adb_close(write_fd_);
+    write_fd_ = -1;
+
+    ASSERT_FALSE(read_protocol_->Read());
+}
+
+// Tests reading from a closed FD.
+TEST_F(ShellProtocolTest, ReadFromClosedFdFail) {
+    adb_close(read_fd_);
+    read_fd_ = -1;
+
+    ASSERT_FALSE(read_protocol_->Read());
+}
+
+// Tests reading from a closed pipe that has a packet waiting. This checks that
+// even if the pipe closes before we can fully read its contents we will still
+// be able to access the last packets.
+TEST_F(ShellProtocolTest, ReadPacketFromClosedPipe) {
+    ShellProtocol::Id id = ShellProtocol::kIdStdout;
+    char data[] = "foo bar";
+
+    memcpy(write_protocol_->data(), data, sizeof(data));
+    ASSERT_TRUE(write_protocol_->Write(id, sizeof(data)));
+    adb_close(write_fd_);
+    write_fd_ = -1;
+
+    // First read should grab the packet.
+    ASSERT_TRUE(read_protocol_->Read());
+    ASSERT_TRUE(PacketEquals(read_protocol_, id, data, sizeof(data)));
+
+    // Second read should fail.
+    ASSERT_FALSE(read_protocol_->Read());
+}
diff --git a/base/Android.mk b/base/Android.mk
index cb04927..ebc2e07 100644
--- a/base/Android.mk
+++ b/base/Android.mk
@@ -26,6 +26,7 @@
 libbase_test_src_files := \
     file_test.cpp \
     logging_test.cpp \
+    parseint_test.cpp \
     stringprintf_test.cpp \
     strings_test.cpp \
     test_main.cpp \
diff --git a/base/include/base/parseint.h b/base/include/base/parseint.h
new file mode 100644
index 0000000..9ecbfbc
--- /dev/null
+++ b/base/include/base/parseint.h
@@ -0,0 +1,71 @@
+/*
+ * Copyright (C) 2015 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.
+ */
+
+#ifndef BASE_PARSEINT_H
+#define BASE_PARSEINT_H
+
+#include <errno.h>
+#include <stdlib.h>
+
+#include <limits>
+
+namespace android {
+namespace base {
+
+// Parses the unsigned decimal integer in the string 's' and sets 'out' to
+// that value. Optionally allows the caller to define a 'max' beyond which
+// otherwise valid values will be rejected. Returns boolean success.
+template <typename T>
+bool ParseUint(const char* s, T* out,
+               T max = std::numeric_limits<T>::max()) {
+  errno = 0;
+  char* end;
+  unsigned long long int result = strtoull(s, &end, 10);
+  if (errno != 0 || s == end || *end != '\0') {
+    return false;
+  }
+  if (max < result) {
+    return false;
+  }
+  *out = static_cast<T>(result);
+  return true;
+}
+
+// Parses the signed decimal integer in the string 's' and sets 'out' to
+// that value. Optionally allows the caller to define a 'min' and 'max
+// beyond which otherwise valid values will be rejected. Returns boolean
+// success.
+template <typename T>
+bool ParseInt(const char* s, T* out,
+              T min = std::numeric_limits<T>::min(),
+              T max = std::numeric_limits<T>::max()) {
+  errno = 0;
+  char* end;
+  long long int result = strtoll(s, &end, 10);
+  if (errno != 0 || s == end || *end != '\0') {
+    return false;
+  }
+  if (result < min || max < result) {
+    return false;
+  }
+  *out = static_cast<T>(result);
+  return true;
+}
+
+}  // namespace base
+}  // namespace android
+
+#endif  // BASE_PARSEINT_H
diff --git a/base/parseint_test.cpp b/base/parseint_test.cpp
new file mode 100644
index 0000000..6a109f4
--- /dev/null
+++ b/base/parseint_test.cpp
@@ -0,0 +1,68 @@
+/*
+ * Copyright (C) 2015 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 "base/parseint.h"
+
+#include <gtest/gtest.h>
+
+TEST(parseint, signed_smoke) {
+  int i;
+  ASSERT_EQ(false, android::base::ParseInt("x", &i));
+  ASSERT_EQ(false, android::base::ParseInt("123x", &i));
+
+  ASSERT_EQ(true, android::base::ParseInt("123", &i));
+  ASSERT_EQ(123, i);
+  ASSERT_EQ(true, android::base::ParseInt("-123", &i));
+  ASSERT_EQ(-123, i);
+
+  short s;
+  ASSERT_EQ(true, android::base::ParseInt("1234", &s));
+  ASSERT_EQ(1234, s);
+
+  ASSERT_EQ(true, android::base::ParseInt("12", &i, 0, 15));
+  ASSERT_EQ(12, i);
+  ASSERT_EQ(false, android::base::ParseInt("-12", &i, 0, 15));
+  ASSERT_EQ(false, android::base::ParseInt("16", &i, 0, 15));
+}
+
+TEST(parseint, unsigned_smoke) {
+  unsigned int i;
+  ASSERT_EQ(false, android::base::ParseUint("x", &i));
+  ASSERT_EQ(false, android::base::ParseUint("123x", &i));
+
+  ASSERT_EQ(true, android::base::ParseUint("123", &i));
+  ASSERT_EQ(123u, i);
+  ASSERT_EQ(false, android::base::ParseUint("-123", &i));
+
+  unsigned short s;
+  ASSERT_EQ(true, android::base::ParseUint("1234", &s));
+  ASSERT_EQ(1234u, s);
+
+  ASSERT_EQ(true, android::base::ParseUint("12", &i, 15u));
+  ASSERT_EQ(12u, i);
+  ASSERT_EQ(false, android::base::ParseUint("-12", &i, 15u));
+  ASSERT_EQ(false, android::base::ParseUint("16", &i, 15u));
+}
+
+TEST(parseint, no_implicit_octal) {
+  int i;
+  ASSERT_EQ(true, android::base::ParseInt("0123", &i));
+  ASSERT_EQ(123, i);
+
+  unsigned int u;
+  ASSERT_EQ(true, android::base::ParseUint("0123", &u));
+  ASSERT_EQ(123u, u);
+}
diff --git a/toolbox/Android.mk b/toolbox/Android.mk
index 1d3605e..f4a03fe 100644
--- a/toolbox/Android.mk
+++ b/toolbox/Android.mk
@@ -43,7 +43,6 @@
     iftop \
     ioctl \
     log \
-    lsof \
     nandread \
     newfs_msdos \
     ps \
diff --git a/toolbox/lsof.c b/toolbox/lsof.c
deleted file mode 100644
index 198ca52..0000000
--- a/toolbox/lsof.c
+++ /dev/null
@@ -1,296 +0,0 @@
-/*
- * Copyright (c) 2010, The Android Open Source Project
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *  * Redistributions of source code must retain the above copyright
- *    notice, this list of conditions and the following disclaimer.
- *  * Redistributions in binary form must reproduce the above copyright
- *    notice, this list of conditions and the following disclaimer in
- *    the documentation and/or other materials provided with the
- *    distribution.
- *  * Neither the name of Google, Inc. nor the names of its contributors
- *    may be used to endorse or promote products derived from this
- *    software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#include <ctype.h>
-#include <dirent.h>
-#include <errno.h>
-#include <fcntl.h>
-#include <libgen.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-
-#include <pwd.h>
-#include <sys/stat.h>
-
-#define BUF_MAX 1024
-#define CMD_DISPLAY_MAX (9 + 1)
-#define USER_DISPLAY_MAX (10 + 1)
-
-struct pid_info_t {
-    pid_t pid;
-    char user[USER_DISPLAY_MAX];
-
-    char cmdline[CMD_DISPLAY_MAX];
-
-    char path[PATH_MAX];
-    ssize_t parent_length;
-};
-
-static void print_header()
-{
-    printf("%-9s %5s %10s %4s   %9s %18s %9s %10s %s\n",
-            "COMMAND",
-            "PID",
-            "USER",
-            "FD",
-            "TYPE",
-            "DEVICE",
-            "SIZE/OFF",
-            "NODE",
-            "NAME");
-}
-
-static void print_symlink(const char* name, const char* path, struct pid_info_t* info)
-{
-    static ssize_t link_dest_size;
-    static char link_dest[PATH_MAX];
-
-    strlcat(info->path, path, sizeof(info->path));
-    if ((link_dest_size = readlink(info->path, link_dest, sizeof(link_dest)-1)) < 0) {
-        if (errno == ENOENT)
-            goto out;
-
-        snprintf(link_dest, sizeof(link_dest), "%s (readlink: %s)", info->path, strerror(errno));
-    } else {
-        link_dest[link_dest_size] = '\0';
-    }
-
-    // Things that are just the root filesystem are uninteresting (we already know)
-    if (!strcmp(link_dest, "/"))
-        goto out;
-
-    const char* fd = name;
-    char rw = ' ';
-    char locks = ' '; // TODO: read /proc/locks
-
-    const char* type = "unknown";
-    char device[32] = "?";
-    char size_off[32] = "?";
-    char node[32] = "?";
-
-    struct stat sb;
-    if (lstat(link_dest, &sb) != -1) {
-        switch ((sb.st_mode & S_IFMT)) {
-          case S_IFSOCK: type = "sock"; break; // TODO: what domain?
-          case S_IFLNK: type = "LINK"; break;
-          case S_IFREG: type = "REG"; break;
-          case S_IFBLK: type = "BLK"; break;
-          case S_IFDIR: type = "DIR"; break;
-          case S_IFCHR: type = "CHR"; break;
-          case S_IFIFO: type = "FIFO"; break;
-        }
-        snprintf(device, sizeof(device), "%d,%d", (int) sb.st_dev, (int) sb.st_rdev);
-        snprintf(node, sizeof(node), "%d", (int) sb.st_ino);
-        snprintf(size_off, sizeof(size_off), "%d", (int) sb.st_size);
-    }
-
-    if (!name) {
-        // We're looking at an fd, so read its flags.
-        fd = path;
-        char fdinfo_path[PATH_MAX];
-        snprintf(fdinfo_path, sizeof(fdinfo_path), "/proc/%d/fdinfo/%s", info->pid, path);
-        FILE* fp = fopen(fdinfo_path, "r");
-        if (fp != NULL) {
-            int pos;
-            unsigned flags;
-
-            if (fscanf(fp, "pos: %d flags: %o", &pos, &flags) == 2) {
-                flags &= O_ACCMODE;
-                if (flags == O_RDONLY) rw = 'r';
-                else if (flags == O_WRONLY) rw = 'w';
-                else rw = 'u';
-            }
-            fclose(fp);
-        }
-    }
-
-    printf("%-9s %5d %10s %4s%c%c %9s %18s %9s %10s %s\n",
-            info->cmdline, info->pid, info->user, fd, rw, locks, type, device, size_off, node, link_dest);
-
-out:
-    info->path[info->parent_length] = '\0';
-}
-
-// Prints out all file that have been memory mapped
-static void print_maps(struct pid_info_t* info)
-{
-    FILE *maps;
-    size_t offset;
-    char device[10];
-    long int inode;
-    char file[PATH_MAX];
-
-    strlcat(info->path, "maps", sizeof(info->path));
-
-    maps = fopen(info->path, "r");
-    if (!maps)
-        goto out;
-
-    while (fscanf(maps, "%*x-%*x %*s %zx %s %ld %s\n", &offset, device, &inode, file) == 4) {
-        // We don't care about non-file maps
-        if (inode == 0 || !strcmp(device, "00:00"))
-            continue;
-
-        printf("%-9s %5d %10s %4s   %9s %18s %9zd %10ld %s\n",
-                info->cmdline, info->pid, info->user, "mem",
-                "REG", device, offset, inode, file);
-    }
-
-    fclose(maps);
-
-out:
-    info->path[info->parent_length] = '\0';
-}
-
-// Prints out all open file descriptors
-static void print_fds(struct pid_info_t* info)
-{
-    static char* fd_path = "fd/";
-    strlcat(info->path, fd_path, sizeof(info->path));
-
-    int previous_length = info->parent_length;
-    info->parent_length += strlen(fd_path);
-
-    DIR *dir = opendir(info->path);
-    if (dir == NULL) {
-        char msg[BUF_MAX];
-        snprintf(msg, sizeof(msg), "%s (opendir: %s)", info->path, strerror(errno));
-        printf("%-9s %5d %10s %4s   %9s %18s %9s %10s %s\n",
-                info->cmdline, info->pid, info->user, "FDS",
-                "", "", "", "", msg);
-        goto out;
-    }
-
-    struct dirent* de;
-    while ((de = readdir(dir))) {
-        if (!strcmp(de->d_name, ".") || !strcmp(de->d_name, ".."))
-            continue;
-
-        print_symlink(NULL, de->d_name, info);
-    }
-    closedir(dir);
-
-out:
-    info->parent_length = previous_length;
-    info->path[info->parent_length] = '\0';
-}
-
-static void lsof_dumpinfo(pid_t pid)
-{
-    int fd;
-    struct pid_info_t info;
-    struct stat pidstat;
-    struct passwd *pw;
-
-    info.pid = pid;
-    snprintf(info.path, sizeof(info.path), "/proc/%d/", pid);
-    info.parent_length = strlen(info.path);
-
-    // Get the UID by calling stat on the proc/pid directory.
-    if (!stat(info.path, &pidstat)) {
-        pw = getpwuid(pidstat.st_uid);
-        if (pw) {
-            strlcpy(info.user, pw->pw_name, sizeof(info.user));
-        } else {
-            snprintf(info.user, USER_DISPLAY_MAX, "%d", (int)pidstat.st_uid);
-        }
-    } else {
-        strcpy(info.user, "???");
-    }
-
-    // Read the command line information; each argument is terminated with NULL.
-    strlcat(info.path, "cmdline", sizeof(info.path));
-    fd = open(info.path, O_RDONLY);
-    if (fd < 0) {
-        fprintf(stderr, "Couldn't read %s\n", info.path);
-        return;
-    }
-
-    char cmdline[PATH_MAX];
-    int numRead = read(fd, cmdline, sizeof(cmdline) - 1);
-    close(fd);
-
-    if (numRead < 0) {
-        fprintf(stderr, "Error reading cmdline: %s: %s\n", info.path, strerror(errno));
-        return;
-    }
-
-    cmdline[numRead] = '\0';
-
-    // We only want the basename of the cmdline
-    strlcpy(info.cmdline, basename(cmdline), sizeof(info.cmdline));
-
-    // Read each of these symlinks
-    print_symlink("cwd", "cwd", &info);
-    print_symlink("txt", "exe", &info);
-    print_symlink("rtd", "root", &info);
-    print_fds(&info);
-    print_maps(&info);
-}
-
-int lsof_main(int argc, char *argv[])
-{
-    long int pid = 0;
-    char* endptr;
-    if (argc == 2) {
-        pid = strtol(argv[1], &endptr, 10);
-    }
-
-    print_header();
-
-    if (pid) {
-        lsof_dumpinfo(pid);
-    } else {
-        DIR *dir = opendir("/proc");
-        if (dir == NULL) {
-            fprintf(stderr, "Couldn't open /proc\n");
-            return -1;
-        }
-
-        struct dirent* de;
-        while ((de = readdir(dir))) {
-            if (!strcmp(de->d_name, ".") || !strcmp(de->d_name, ".."))
-                continue;
-
-            // Only inspect directories that are PID numbers
-            pid = strtol(de->d_name, &endptr, 10);
-            if (*endptr != '\0')
-                continue;
-
-            lsof_dumpinfo(pid);
-        }
-        closedir(dir);
-    }
-
-    return 0;
-}