Initial checkin from CRI-O repo

Signed-off-by: Matthew Heon <matthew.heon@gmail.com>

4 files changed, 1673 insertions, 0 deletions

diff --git a/conmon/Makefile b/conmon/Makefile
new file mode 100644
index 000000000..b75605d94
--- /dev/null
+++ b/conmon/Makefile
@@ -0,0 +1,12 @@
+src = $(wildcard *.c)
+obj = $(src:.c=.o)
+
+override LIBS += $(shell pkg-config --libs glib-2.0)
+override CFLAGS += -std=c99 -Os -Wall -Wextra $(shell pkg-config --cflags glib-2.0)
+
+conmon: $(obj)
+	$(CC) -o ../bin/$@ $^ $(CFLAGS) $(LIBS)
+
+.PHONY: clean
+clean:
+	rm -f $(obj) ../bin/conmon
diff --git a/conmon/cmsg.c b/conmon/cmsg.c
new file mode 100644
index 000000000..c44db2ef1
--- /dev/null
+++ b/conmon/cmsg.c
@@ -0,0 +1,149 @@
+/*
+ * Copyright 2016 SUSE LLC
+ *
+ * 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.
+ */
+
+/* NOTE: This code comes directly from runc/libcontainer/utils/cmsg.c. */
+
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "cmsg.h"
+
+#define error(fmt, ...)							\
+	({								\
+		fprintf(stderr, "nsenter: " fmt ": %m\n", ##__VA_ARGS__); \
+		errno = ECOMM;						\
+		goto err; /* return value */				\
+	})
+
+/*
+ * Sends a file descriptor along the sockfd provided. Returns the return
+ * value of sendmsg(2). Any synchronisation and preparation of state
+ * should be done external to this (we expect the other side to be in
+ * recvfd() in the code).
+ */
+ssize_t sendfd(int sockfd, struct file_t file)
+{
+	struct msghdr msg = {0};
+	struct iovec iov[1] = {0};
+	struct cmsghdr *cmsg;
+	int *fdptr;
+
+	union {
+		char buf[CMSG_SPACE(sizeof(file.fd))];
+		struct cmsghdr align;
+	} u;
+
+	/*
+	 * We need to send some other data along with the ancillary data,
+	 * otherwise the other side won't recieve any data. This is very
+	 * well-hidden in the documentation (and only applies to
+	 * SOCK_STREAM). See the bottom part of unix(7).
+	 */
+	iov[0].iov_base = file.name;
+	iov[0].iov_len = strlen(file.name) + 1;
+
+	msg.msg_name = NULL;
+	msg.msg_namelen = 0;
+	msg.msg_iov = iov;
+	msg.msg_iovlen = 1;
+	msg.msg_control = u.buf;
+	msg.msg_controllen = sizeof(u.buf);
+
+	cmsg = CMSG_FIRSTHDR(&msg);
+	cmsg->cmsg_level = SOL_SOCKET;
+	cmsg->cmsg_type = SCM_RIGHTS;
+	cmsg->cmsg_len = CMSG_LEN(sizeof(int));
+
+	fdptr = (int *) CMSG_DATA(cmsg);
+	memcpy(fdptr, &file.fd, sizeof(int));
+
+	return sendmsg(sockfd, &msg, 0);
+}
+
+/*
+ * Receives a file descriptor from the sockfd provided. Returns the file
+ * descriptor as sent from sendfd(). It will return the file descriptor
+ * or die (literally) trying. Any synchronisation and preparation of
+ * state should be done external to this (we expect the other side to be
+ * in sendfd() in the code).
+ */
+struct file_t recvfd(int sockfd)
+{
+	struct msghdr msg = {0};
+	struct iovec iov[1] = {0};
+	struct cmsghdr *cmsg;
+	struct file_t file = {0};
+	int *fdptr;
+	int olderrno;
+
+	union {
+		char buf[CMSG_SPACE(sizeof(file.fd))];
+		struct cmsghdr align;
+	} u;
+
+	/* Allocate a buffer. */
+	/* TODO: Make this dynamic with MSG_PEEK. */
+	file.name = malloc(TAG_BUFFER);
+	if (!file.name)
+		error("recvfd: failed to allocate file.tag buffer\n");
+
+	/*
+	 * We need to "recieve" the non-ancillary data even though we don't
+	 * plan to use it at all. Otherwise, things won't work as expected.
+	 * See unix(7) and other well-hidden documentation.
+	 */
+	iov[0].iov_base = file.name;
+	iov[0].iov_len = TAG_BUFFER;
+
+	msg.msg_name = NULL;
+	msg.msg_namelen = 0;
+	msg.msg_iov = iov;
+	msg.msg_iovlen = 1;
+	msg.msg_control = u.buf;
+	msg.msg_controllen = sizeof(u.buf);
+
+	ssize_t ret = recvmsg(sockfd, &msg, 0);
+	if (ret < 0)
+		goto err;
+
+	cmsg = CMSG_FIRSTHDR(&msg);
+	if (!cmsg)
+		error("recvfd: got NULL from CMSG_FIRSTHDR");
+	if (cmsg->cmsg_level != SOL_SOCKET)
+		error("recvfd: expected SOL_SOCKET in cmsg: %d", cmsg->cmsg_level);
+	if (cmsg->cmsg_type != SCM_RIGHTS)
+		error("recvfd: expected SCM_RIGHTS in cmsg: %d", cmsg->cmsg_type);
+	if (cmsg->cmsg_len != CMSG_LEN(sizeof(int)))
+		error("recvfd: expected correct CMSG_LEN in cmsg: %lu", cmsg->cmsg_len);
+
+	fdptr = (int *) CMSG_DATA(cmsg);
+	if (!fdptr || *fdptr < 0)
+		error("recvfd: recieved invalid pointer");
+
+	file.fd = *fdptr;
+	return file;
+
+err:
+	olderrno = errno;
+	free(file.name);
+	errno = olderrno;
+	return (struct file_t){0};
+}
diff --git a/conmon/cmsg.h b/conmon/cmsg.h
new file mode 100644
index 000000000..7c7aefe6e
--- /dev/null
+++ b/conmon/cmsg.h
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2016 SUSE LLC
+ *
+ * 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.
+ */
+
+/* NOTE: This code comes directly from runc/libcontainer/utils/cmsg.h. */
+
+#pragma once
+
+#if !defined(CMSG_H)
+#define CMSG_H
+
+#include <sys/types.h>
+
+/* TODO: Implement this properly with MSG_PEEK. */
+#define TAG_BUFFER 4096
+
+/* This mirrors Go's (*os.File). */
+struct file_t {
+	char *name;
+	int fd;
+};
+
+struct file_t recvfd(int sockfd);
+ssize_t sendfd(int sockfd, struct file_t file);
+
+#endif /* !defined(CMSG_H) */
diff --git a/conmon/conmon.c b/conmon/conmon.c
new file mode 100644
index 000000000..66d1bbe08
--- /dev/null
+++ b/conmon/conmon.c
@@ -0,0 +1,1474 @@
+#define _GNU_SOURCE
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+#include <sys/prctl.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <sys/un.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <sys/eventfd.h>
+#include <sys/stat.h>
+#include <sys/uio.h>
+#include <sys/ioctl.h>
+#include <termios.h>
+#include <syslog.h>
+#include <unistd.h>
+#include <inttypes.h>
+
+#include <glib.h>
+#include <glib-unix.h>
+
+#include "cmsg.h"
+
+#define pexit(fmt, ...)                                                          \
+	do {                                                                     \
+		fprintf(stderr, "[conmon:e]: " fmt " %m\n", ##__VA_ARGS__);      \
+		syslog(LOG_ERR, "conmon <error>: " fmt ": %m\n", ##__VA_ARGS__); \
+		exit(EXIT_FAILURE);                                              \
+	} while (0)
+
+#define nexit(fmt, ...)                                                       \
+	do {                                                                  \
+		fprintf(stderr, "[conmon:e]: " fmt "\n", ##__VA_ARGS__);      \
+		syslog(LOG_ERR, "conmon <error>: " fmt " \n", ##__VA_ARGS__); \
+		exit(EXIT_FAILURE);                                           \
+	} while (0)
+
+#define nwarn(fmt, ...)                                                        \
+	do {                                                                   \
+		fprintf(stderr, "[conmon:w]: " fmt "\n", ##__VA_ARGS__);       \
+		syslog(LOG_INFO, "conmon <nwarn>: " fmt " \n", ##__VA_ARGS__); \
+	} while (0)
+
+#define ninfo(fmt, ...)                                                        \
+	do {                                                                   \
+		fprintf(stderr, "[conmon:i]: " fmt "\n", ##__VA_ARGS__);       \
+		syslog(LOG_INFO, "conmon <ninfo>: " fmt " \n", ##__VA_ARGS__); \
+	} while (0)
+
+#define _cleanup_(x) __attribute__((cleanup(x)))
+
+static inline void freep(void *p)
+{
+	free(*(void **)p);
+}
+
+static inline void closep(int *fd)
+{
+	if (*fd >= 0)
+		close(*fd);
+	*fd = -1;
+}
+
+static inline void fclosep(FILE **fp) {
+	if (*fp)
+		fclose(*fp);
+	*fp = NULL;
+}
+
+static inline void gstring_free_cleanup(GString **string)
+{
+	if (*string)
+		g_string_free(*string, TRUE);
+}
+
+static inline void strv_cleanup(char ***strv)
+{
+	if (strv)
+		g_strfreev (*strv);
+}
+
+#define _cleanup_free_ _cleanup_(freep)
+#define _cleanup_close_ _cleanup_(closep)
+#define _cleanup_fclose_ _cleanup_(fclosep)
+#define _cleanup_gstring_ _cleanup_(gstring_free_cleanup)
+#define _cleanup_strv_ _cleanup_(strv_cleanup)
+
+#define BUF_SIZE 8192
+#define CMD_SIZE 1024
+#define MAX_EVENTS 10
+
+#define DEFAULT_SOCKET_PATH "/var/lib/crio"
+
+static bool opt_terminal = false;
+static bool opt_stdin = false;
+static char *opt_cid = NULL;
+static char *opt_cuuid = NULL;
+static char *opt_runtime_path = NULL;
+static char *opt_bundle_path = NULL;
+static char *opt_pid_file = NULL;
+static bool opt_systemd_cgroup = false;
+static bool opt_no_pivot = false;
+static char *opt_exec_process_spec = NULL;
+static bool opt_exec = false;
+static char *opt_log_path = NULL;
+static char *opt_exit_dir = NULL;
+static int opt_timeout = 0;
+static int64_t opt_log_size_max = -1;
+static char *opt_socket_path = DEFAULT_SOCKET_PATH;
+static GOptionEntry opt_entries[] =
+{
+  { "terminal", 't', 0, G_OPTION_ARG_NONE, &opt_terminal, "Terminal", NULL },
+  { "stdin", 'i', 0, G_OPTION_ARG_NONE, &opt_stdin, "Stdin", NULL },
+  { "cid", 'c', 0, G_OPTION_ARG_STRING, &opt_cid, "Container ID", NULL },
+  { "cuuid", 'u', 0, G_OPTION_ARG_STRING, &opt_cuuid, "Container UUID", NULL },
+  { "runtime", 'r', 0, G_OPTION_ARG_STRING, &opt_runtime_path, "Runtime path", NULL },
+  { "no-pivot", 0, 0, G_OPTION_ARG_NONE, &opt_no_pivot, "do not use pivot_root", NULL },
+  { "bundle", 'b', 0, G_OPTION_ARG_STRING, &opt_bundle_path, "Bundle path", NULL },
+  { "pidfile", 'p', 0, G_OPTION_ARG_STRING, &opt_pid_file, "PID file", NULL },
+  { "systemd-cgroup", 's', 0, G_OPTION_ARG_NONE, &opt_systemd_cgroup, "Enable systemd cgroup manager", NULL },
+  { "exec", 'e', 0, G_OPTION_ARG_NONE, &opt_exec, "Exec a command in a running container", NULL },
+  { "exec-process-spec", 0, 0, G_OPTION_ARG_STRING, &opt_exec_process_spec, "Path to the process spec for exec", NULL },
+  { "exit-dir", 0, 0, G_OPTION_ARG_STRING, &opt_exit_dir, "Path to the directory where exit files are written", NULL },
+  { "log-path", 'l', 0, G_OPTION_ARG_STRING, &opt_log_path, "Log file path", NULL },
+  { "timeout", 'T', 0, G_OPTION_ARG_INT, &opt_timeout, "Timeout in seconds", NULL },
+  { "log-size-max", 0, 0, G_OPTION_ARG_INT64, &opt_log_size_max, "Maximum size of log file", NULL },
+  { "socket-dir-path", 0, 0, G_OPTION_ARG_STRING, &opt_socket_path, "Location of container attach sockets", NULL },
+  { NULL }
+};
+
+/* strlen("1997-03-25T13:20:42.999999999+01:00 stdout ") + 1 */
+#define TSBUFLEN 44
+
+#define CGROUP_ROOT "/sys/fs/cgroup"
+
+static int log_fd = -1;
+
+static ssize_t write_all(int fd, const void *buf, size_t count)
+{
+	size_t remaining = count;
+	const char *p = buf;
+	ssize_t res;
+
+	while (remaining > 0) {
+		do {
+			res = write(fd, p, remaining);
+		} while (res == -1 && errno == EINTR);
+
+		if (res <= 0)
+			return -1;
+
+		remaining -= res;
+		p += res;
+	}
+
+	return count;
+}
+
+#define WRITEV_BUFFER_N_IOV 128
+
+typedef struct {
+	int iovcnt;
+	struct iovec iov[WRITEV_BUFFER_N_IOV];
+} writev_buffer_t;
+
+static ssize_t writev_buffer_flush (int fd, writev_buffer_t *buf)
+{
+	size_t count = 0;
+	ssize_t res;
+	struct iovec *iov;
+	int iovcnt;
+
+	iovcnt = buf->iovcnt;
+	iov = buf->iov;
+
+	while (iovcnt > 0) {
+		do {
+			res = writev(fd, iov, iovcnt);
+		} while (res == -1 && errno == EINTR);
+
+		if (res <= 0)
+			return -1;
+
+		count += res;
+
+		while (res > 0) {
+			size_t from_this = MIN((size_t)res, iov->iov_len);
+			iov->iov_len -= from_this;
+			res -= from_this;
+
+			if (iov->iov_len == 0) {
+				iov++;
+				iovcnt--;
+			}
+		}
+	}
+
+	buf->iovcnt = 0;
+
+	return count;
+}
+
+ssize_t writev_buffer_append_segment(int fd, writev_buffer_t *buf, const void *data, ssize_t len)
+{
+	if (data == NULL)
+		return 1;
+
+	if (len < 0)
+		len = strlen ((char *)data);
+
+	if (buf->iovcnt == WRITEV_BUFFER_N_IOV &&
+	    writev_buffer_flush (fd, buf) < 0)
+		return -1;
+
+	if (len > 0) {
+		buf->iov[buf->iovcnt].iov_base = (void *)data;
+		buf->iov[buf->iovcnt].iov_len = (size_t)len;
+		buf->iovcnt++;
+	}
+
+	return 1;
+}
+
+int set_k8s_timestamp(char *buf, ssize_t buflen, const char *pipename)
+{
+	struct tm *tm;
+	struct timespec ts;
+	char off_sign = '+';
+	int off, len, err = -1;
+
+	if (clock_gettime(CLOCK_REALTIME, &ts) < 0) {
+		/* If CLOCK_REALTIME is not supported, we set nano seconds to 0 */
+		if (errno == EINVAL) {
+			ts.tv_nsec = 0;
+		} else {
+			return err;
+		}
+	}
+
+	if ((tm = localtime(&ts.tv_sec)) == NULL)
+		return err;
+
+
+	off = (int) tm->tm_gmtoff;
+	if (tm->tm_gmtoff < 0) {
+		off_sign = '-';
+		off = -off;
+	}
+
+	len = snprintf(buf, buflen, "%d-%02d-%02dT%02d:%02d:%02d.%09ld%c%02d:%02d %s ",
+		       tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
+		       tm->tm_hour, tm->tm_min, tm->tm_sec, ts.tv_nsec,
+		       off_sign, off / 3600, off % 3600, pipename);
+
+	if (len < buflen)
+		err = 0;
+	return err;
+}
+
+/* stdpipe_t represents one of the std pipes (or NONE).
+ * Sync with const in container_attach.go */
+typedef enum {
+	NO_PIPE,
+	STDIN_PIPE, /* unused */
+	STDOUT_PIPE,
+	STDERR_PIPE,
+} stdpipe_t;
+
+const char *stdpipe_name(stdpipe_t pipe)
+{
+	switch (pipe) {
+	case STDIN_PIPE:
+		return "stdin";
+	case STDOUT_PIPE:
+		return "stdout";
+	case STDERR_PIPE:
+		return "stderr";
+	default:
+		return "NONE";
+	}
+}
+
+/*
+ * The CRI requires us to write logs with a (timestamp, stream, line) format
+ * for every newline-separated line. write_k8s_log writes said format for every
+ * line in buf, and will partially write the final line of the log if buf is
+ * not terminated by a newline.
+ */
+static int write_k8s_log(int fd, stdpipe_t pipe, const char *buf, ssize_t buflen)
+{
+	char tsbuf[TSBUFLEN];
+	static stdpipe_t trailing_line = NO_PIPE;
+	writev_buffer_t bufv = {0};
+	static int64_t bytes_written = 0;
+	int64_t bytes_to_be_written = 0;
+
+	/*
+	 * Use the same timestamp for every line of the log in this buffer.
+	 * There is no practical difference in the output since write(2) is
+	 * fast.
+	 */
+	if (set_k8s_timestamp(tsbuf, sizeof tsbuf, stdpipe_name(pipe)))
+		/* TODO: We should handle failures much more cleanly than this. */
+		return -1;
+
+	while (buflen > 0) {
+		const char *line_end = NULL;
+		ptrdiff_t line_len = 0;
+		bool insert_newline = FALSE;
+		bool insert_timestamp = FALSE;
+
+		/* Find the end of the line, or alternatively the end of the buffer. */
+		line_end = memchr(buf, '\n', buflen);
+		if (line_end == NULL)
+			line_end = &buf[buflen-1];
+		line_len = line_end - buf + 1;
+
+		bytes_to_be_written = line_len;
+		if (trailing_line != pipe) {
+			/*
+			 * Write the (timestamp, stream) tuple if there isn't any trailing
+			 * output from the previous line (or if there is trailing output but
+			 * the current buffer being printed is from a different pipe).
+			 */
+			insert_timestamp = TRUE;
+			bytes_to_be_written += (TSBUFLEN - 1);
+			/*
+			 * If there was a trailing line from a different pipe, prepend a
+			 * newline to split it properly. This technically breaks the flow
+			 * of the previous line (adding a newline in the log where there
+			 * wasn't one output) but without modifying the file in a
+			 * non-append-only way there's not much we can do.
+			 */
+			if (trailing_line != NO_PIPE) {
+				insert_newline = TRUE;
+				bytes_to_be_written += 1;
+			}
+		}
+
+		/*
+		 * We re-open the log file if writing out the bytes will exceed the max
+		 * log size. We also reset the state so that the new file is started with
+		 * a timestamp.
+		 */
+		if ((opt_log_size_max > 0) && (bytes_written + bytes_to_be_written) > opt_log_size_max) {
+			ninfo("Creating new log file");
+			insert_newline = FALSE;
+			insert_timestamp = TRUE;
+			bytes_written = 0;
+
+			/* Close the existing fd */
+			close(fd);
+
+			/* Unlink the file */
+			if (unlink(opt_log_path) < 0) {
+				pexit("Failed to unlink log file");
+			}
+
+			/* Open the log path file again */
+			log_fd = open(opt_log_path, O_WRONLY | O_APPEND | O_CREAT | O_CLOEXEC, 0600);
+			if (log_fd < 0)
+				pexit("Failed to open log file");
+			fd = log_fd;
+		}
+
+		/* Output a newline */
+		if (insert_newline) {
+			if (writev_buffer_append_segment(fd, &bufv, "\n", -1) < 0) {
+				nwarn("failed to write newline to log");
+				goto next;
+			}
+		}
+
+		/* Output a timestamp */
+		if (insert_timestamp) {
+			if (writev_buffer_append_segment(fd, &bufv, tsbuf, -1) < 0) {
+				nwarn("failed to write (timestamp, stream) to log");
+				goto next;
+			}
+		}
+
+		/* Output the actual contents. */
+		if (writev_buffer_append_segment(fd, &bufv, buf, line_len) < 0) {
+			nwarn("failed to write buffer to log");
+			goto next;
+		}
+
+		bytes_written += bytes_to_be_written;
+
+		/* If we did not output a full line, then we are a trailing_line. */
+		trailing_line = (*line_end == '\n') ? NO_PIPE : pipe;
+
+next:
+		/* Update the head of the buffer remaining to output. */
+		buf += line_len;
+		buflen -= line_len;
+	}
+
+	if (writev_buffer_flush (fd, &bufv) < 0) {
+		nwarn("failed to flush buffer to log");
+	}
+
+	ninfo("Total bytes written: %"PRId64"", bytes_written);
+
+	return 0;
+}
+
+/*
+ * Returns the path for specified controller name for a pid.
+ * Returns NULL on error.
+ */
+static char *process_cgroup_subsystem_path(int pid, const char *subsystem) {
+	_cleanup_free_ char *cgroups_file_path = g_strdup_printf("/proc/%d/cgroup", pid);
+	_cleanup_fclose_ FILE *fp = NULL;
+	fp = fopen(cgroups_file_path, "re");
+	if (fp == NULL) {
+		nwarn("Failed to open cgroups file: %s", cgroups_file_path);
+		return NULL;
+	}
+
+	_cleanup_free_ char *line = NULL;
+	ssize_t read;
+	size_t len = 0;
+	char *ptr, *path;
+	char *subsystem_path = NULL;
+	int i;
+	while ((read = getline(&line, &len, fp)) != -1) {
+		_cleanup_strv_ char **subsystems = NULL;
+		ptr = strchr(line, ':');
+		if (ptr == NULL) {
+			nwarn("Error parsing cgroup, ':' not found: %s", line);
+			return NULL;
+		}
+		ptr++;
+		path = strchr(ptr, ':');
+		if (path == NULL) {
+			nwarn("Error parsing cgroup, second ':' not found: %s", line);
+			return NULL;
+		}
+		*path = 0;
+		path++;
+		subsystems = g_strsplit (ptr, ",", -1);
+		for (i = 0; subsystems[i] != NULL; i++) {
+			if (strcmp (subsystems[i], subsystem) == 0) {
+				char *subpath = strchr(subsystems[i], '=');
+				if (subpath == NULL) {
+					subpath = ptr;
+				} else {
+					*subpath = 0;
+				}
+
+				subsystem_path = g_strdup_printf("%s/%s%s", CGROUP_ROOT, subpath, path);
+				subsystem_path[strlen(subsystem_path) - 1] = '\0';
+				return subsystem_path;
+			}
+		}
+	}
+
+	return NULL;
+}
+
+static char *escape_json_string(const char *str)
+{
+	GString *escaped;
+	const char *p;
+
+	p = str;
+	escaped = g_string_sized_new(strlen(str));
+
+	while (*p != 0) {
+		char c = *p++;
+		if (c == '\\' || c == '"') {
+			g_string_append_c(escaped, '\\');
+			g_string_append_c(escaped, c);
+		} else if (c == '\n') {
+			g_string_append_printf (escaped, "\\n");
+		} else if (c == '\t') {
+			g_string_append_printf (escaped, "\\t");
+		} else if ((c > 0 && c < 0x1f) || c == 0x7f) {
+			g_string_append_printf (escaped, "\\u00%02x", (guint)c);
+		} else {
+			g_string_append_c (escaped, c);
+		}
+	}
+
+	return g_string_free (escaped, FALSE);
+}
+
+static int get_pipe_fd_from_env(const char *envname)
+{
+	char *pipe_str, *endptr;
+	int pipe_fd;
+
+	pipe_str = getenv(envname);
+	if (pipe_str == NULL)
+		return -1;
+
+	errno = 0;
+	pipe_fd = strtol(pipe_str, &endptr, 10);
+	if (errno != 0 || *endptr != '\0')
+		pexit("unable to parse %s", envname);
+	if (fcntl(pipe_fd, F_SETFD, FD_CLOEXEC) == -1)
+		pexit("unable to make %s CLOEXEC", envname);
+
+	return pipe_fd;
+}
+
+static void add_argv(GPtrArray *argv_array, ...)  G_GNUC_NULL_TERMINATED;
+
+static void add_argv(GPtrArray *argv_array, ...)
+{
+	va_list args;
+	char *arg;
+
+	va_start (args, argv_array);
+	while ((arg = va_arg (args, char *)))
+		g_ptr_array_add (argv_array, arg);
+	va_end (args);
+}
+
+static void end_argv(GPtrArray *argv_array)
+{
+	g_ptr_array_add(argv_array, NULL);
+}
+
+/* Global state */
+
+static int runtime_status = -1;
+static int container_status = -1;
+
+static int masterfd_stdin = -1;
+static int masterfd_stdout = -1;
+static int masterfd_stderr = -1;
+
+/* Used for attach */
+static int conn_sock = -1;
+static int conn_sock_readable;
+static int conn_sock_writable;
+
+static int oom_event_fd = -1;
+static int attach_socket_fd = -1;
+static int console_socket_fd = -1;
+static int terminal_ctrl_fd = -1;
+
+static bool timed_out = FALSE;
+
+static GMainLoop *main_loop = NULL;
+
+static void conn_sock_shutdown(int how)
+{
+	if (conn_sock == -1)
+		return;
+	shutdown(conn_sock, how);
+	if (how & SHUT_RD)
+		conn_sock_readable = false;
+	if (how & SHUT_WR)
+		conn_sock_writable = false;
+	if (!conn_sock_writable && !conn_sock_readable) {
+		close(conn_sock);
+		conn_sock = -1;
+	}
+}
+
+static gboolean stdio_cb(int fd, GIOCondition condition, gpointer user_data);
+
+static gboolean tty_hup_timeout_scheduled = false;
+
+static gboolean tty_hup_timeout_cb (G_GNUC_UNUSED gpointer user_data)
+{
+	tty_hup_timeout_scheduled = false;
+	g_unix_fd_add (masterfd_stdout, G_IO_IN, stdio_cb, GINT_TO_POINTER(STDOUT_PIPE));
+	return G_SOURCE_REMOVE;
+}
+
+static bool read_stdio(int fd, stdpipe_t pipe, bool *eof)
+{
+	#define STDIO_BUF_SIZE 8192 /* Sync with redirectResponseToOutputStreams() */
+	/* We use one extra byte at the start, which we don't read into, instead
+	   we use that for marking the pipe when we write to the attached socket */
+	char real_buf[STDIO_BUF_SIZE + 1];
+        char *buf = real_buf + 1;
+	ssize_t num_read = 0;
+
+	if (eof)
+		*eof = false;
+
+	num_read = read(fd, buf, STDIO_BUF_SIZE);
+	if (num_read == 0) {
+		if (eof)
+			*eof = true;
+		return false;
+	} else if (num_read < 0) {
+		nwarn("stdio_input read failed %s", strerror(errno));
+		return false;
+	} else {
+		if (write_k8s_log(log_fd, pipe, buf, num_read) < 0) {
+			nwarn("write_k8s_log failed");
+			return G_SOURCE_CONTINUE;
+		}
+
+		real_buf[0] = pipe;
+		if (conn_sock_writable && write_all(conn_sock, real_buf, num_read+1) < 0) {
+			nwarn("Failed to write to socket");
+			conn_sock_shutdown(SHUT_WR);
+		}
+		return true;
+	}
+}
+
+static void on_sigchld(G_GNUC_UNUSED int signal)
+{
+	raise (SIGUSR1);
+}
+
+static void check_child_processes(GHashTable *pid_to_handler)
+{
+	void (*cb) (GPid, int, gpointer);
+
+        for (;;) {
+		int status;
+		pid_t pid = waitpid(-1, &status, WNOHANG);
+
+		if (pid < 0 && errno == EINTR)
+			continue;
+		if (pid < 0 && errno == ECHILD) {
+			g_main_loop_quit (main_loop);
+			return;
+		}
+		if (pid < 0)
+			pexit("Failed to read child process status");
+
+		if (pid == 0)
+			return;
+
+		/* If we got here, pid > 0, so we have a valid pid to check.  */
+		cb = g_hash_table_lookup(pid_to_handler, &pid);
+		if (cb)
+			cb(pid, status, 0);
+	}
+}
+
+static gboolean on_sigusr1_cb(gpointer user_data)
+{
+	GHashTable *pid_to_handler = (GHashTable *) user_data;
+	check_child_processes (pid_to_handler);
+        return G_SOURCE_CONTINUE;
+}
+
+static gboolean stdio_cb(int fd, GIOCondition condition, gpointer user_data)
+{
+	stdpipe_t pipe = GPOINTER_TO_INT(user_data);
+	bool read_eof = false;
+	bool has_input = (condition & G_IO_IN) != 0;
+	bool has_hup = (condition & G_IO_HUP) != 0;
+
+	/* When we get here, condition can be G_IO_IN and/or G_IO_HUP.
+	   IN means there is some data to read.
+	   HUP means the other side closed the fd. In the case of a pine
+	   this in final, and we will never get more data. However, in the
+	   terminal case this just means that nobody has the terminal
+	   open at this point, and this can be change whenever someone
+	   opens the tty */
+
+	/* Read any data before handling hup */
+	if (has_input) {
+		read_stdio(fd, pipe, &read_eof);
+	}
+
+	if (has_hup && opt_terminal && pipe == STDOUT_PIPE) {
+		/* We got a HUP from the terminal master this means there
+		   are no open slaves ptys atm, and we will get a lot
+		   of wakeups until we have one, switch to polling
+		   mode. */
+
+		/* If we read some data this cycle, wait one more, maybe there
+		   is more in the buffer before we handle the hup */
+		if (has_input && !read_eof) {
+			return G_SOURCE_CONTINUE;
+		}
+
+		if (!tty_hup_timeout_scheduled) {
+			g_timeout_add (100, tty_hup_timeout_cb, NULL);
+		}
+		tty_hup_timeout_scheduled = true;
+		return G_SOURCE_REMOVE;
+	}
+
+	if (read_eof || (has_hup && !has_input)) {
+		/* End of input */
+		if (pipe == STDOUT_PIPE)
+			masterfd_stdout = -1;
+		if (pipe == STDERR_PIPE)
+			masterfd_stderr = -1;
+
+		close (fd);
+		return G_SOURCE_REMOVE;
+	}
+
+	return G_SOURCE_CONTINUE;
+}
+
+static gboolean timeout_cb (G_GNUC_UNUSED gpointer user_data)
+{
+	timed_out = TRUE;
+	ninfo ("Timed out, killing main loop");
+	g_main_loop_quit (main_loop);
+	return G_SOURCE_REMOVE;
+}
+
+static gboolean oom_cb(int fd, GIOCondition condition, G_GNUC_UNUSED gpointer user_data)
+{
+	uint64_t oom_event;
+	ssize_t num_read = 0;
+
+	if ((condition & G_IO_IN) != 0) {
+		num_read = read(fd, &oom_event, sizeof(uint64_t));
+		if (num_read < 0) {
+			nwarn("Failed to read oom event from eventfd");
+			return G_SOURCE_CONTINUE;
+		}
+
+		if (num_read > 0) {
+			if (num_read != sizeof(uint64_t))
+				nwarn("Failed to read full oom event from eventfd");
+			ninfo("OOM received");
+			if (open("oom", O_CREAT, 0666) < 0) {
+				nwarn("Failed to write oom file");
+			}
+			return G_SOURCE_CONTINUE;
+		}
+	}
+
+	/* End of input */
+	close (fd);
+	oom_event_fd = -1;
+	return G_SOURCE_REMOVE;
+}
+
+static gboolean conn_sock_cb(int fd, GIOCondition condition, G_GNUC_UNUSED gpointer user_data)
+{
+        #define CONN_SOCK_BUF_SIZE 32*1024 /* Match the write size in CopyDetachable */
+	char buf[CONN_SOCK_BUF_SIZE];
+	ssize_t num_read = 0;
+
+	if ((condition & G_IO_IN) != 0) {
+		num_read = read(fd, buf, CONN_SOCK_BUF_SIZE);
+		if (num_read < 0)
+			return G_SOURCE_CONTINUE;
+
+		if (num_read > 0 && masterfd_stdin >= 0) {
+			if (write_all(masterfd_stdin, buf, num_read) < 0) {
+				nwarn("Failed to write to container stdin");
+			}
+			return G_SOURCE_CONTINUE;
+		}
+	}
+
+	/* End of input */
+	conn_sock_shutdown(SHUT_RD);
+	if (masterfd_stdin >= 0 && opt_stdin) {
+		close(masterfd_stdin);
+		masterfd_stdin = -1;
+	}
+	return G_SOURCE_REMOVE;
+}
+
+static gboolean attach_cb(int fd, G_GNUC_UNUSED GIOCondition condition, G_GNUC_UNUSED gpointer user_data)
+{
+	conn_sock = accept(fd, NULL, NULL);
+	if (conn_sock == -1) {
+		if (errno != EWOULDBLOCK)
+			nwarn("Failed to accept client connection on attach socket");
+	} else {
+		conn_sock_readable = true;
+		conn_sock_writable = true;
+		g_unix_fd_add (conn_sock, G_IO_IN|G_IO_HUP|G_IO_ERR, conn_sock_cb, GINT_TO_POINTER(STDOUT_PIPE));
+		ninfo("Accepted connection %d", conn_sock);
+	}
+
+	return G_SOURCE_CONTINUE;
+}
+
+static gboolean ctrl_cb(int fd, G_GNUC_UNUSED GIOCondition condition, G_GNUC_UNUSED gpointer user_data)
+{
+	#define CTLBUFSZ 200
+	static char ctlbuf[CTLBUFSZ];
+	static int readsz = CTLBUFSZ - 1;
+	static char *readptr = ctlbuf;
+	ssize_t num_read = 0;
+	int ctl_msg_type = -1;
+	int height = -1;
+	int width = -1;
+	struct winsize ws;
+	int ret;
+
+	num_read = read(fd, readptr, readsz);
+	if (num_read <= 0) {
+		nwarn("Failed to read from control fd");
+		return G_SOURCE_CONTINUE;
+	}
+
+	readptr[num_read] = '\0';
+	ninfo("Got ctl message: %s\n", ctlbuf);
+
+	char *beg = ctlbuf;
+	char *newline = strchrnul(beg, '\n');
+	/* Process each message which ends with a line */
+	while (*newline != '\0') {
+		ret = sscanf(ctlbuf, "%d %d %d\n", &ctl_msg_type, &height, &width);
+		if (ret != 3) {
+			nwarn("Failed to sscanf message");
+			return G_SOURCE_CONTINUE;
+		}
+		ninfo("Message type: %d, Height: %d, Width: %d", ctl_msg_type, height, width);
+		ret = ioctl(masterfd_stdout, TIOCGWINSZ, &ws);
+		ninfo("Existing size: %d %d", ws.ws_row, ws.ws_col);
+		ws.ws_row = height;
+		ws.ws_col = width;
+		ret = ioctl(masterfd_stdout, TIOCSWINSZ, &ws);
+		if (ret == -1) {
+			nwarn("Failed to set process pty terminal size");
+		}
+		beg = newline + 1;
+		newline = strchrnul(beg, '\n');
+	}
+	if (num_read == (CTLBUFSZ - 1) && beg == ctlbuf) {
+		/*
+		 * We did not find a newline in the entire buffer.
+		 * This shouldn't happen as our buffer is larger than
+		 * the message that we expect to receive.
+		 */
+		nwarn("Could not find newline in entire buffer\n");
+	} else if (*beg == '\0') {
+		/* We exhausted all messages that were complete */
+		readptr = ctlbuf;
+		readsz = CTLBUFSZ - 1;
+	} else {
+		/*
+		 * We copy remaining data to beginning of buffer
+		 * and advance readptr after that.
+		 */
+		int cp_rem = 0;
+		do {
+			ctlbuf[cp_rem++] = *beg++;
+		} while (*beg != '\0');
+		readptr = ctlbuf + cp_rem;
+		readsz = CTLBUFSZ - 1 - cp_rem;
+	}
+
+	return G_SOURCE_CONTINUE;
+}
+
+static gboolean terminal_accept_cb(int fd, G_GNUC_UNUSED GIOCondition condition, G_GNUC_UNUSED gpointer user_data)
+{
+	const char *csname = user_data;
+	struct file_t console;
+	int connfd = -1;
+	struct termios tset;
+
+	ninfo("about to accept from console_socket_fd: %d", fd);
+	connfd = accept4(fd, NULL, NULL, SOCK_CLOEXEC);
+	if (connfd < 0) {
+		nwarn("Failed to accept console-socket connection");
+		return G_SOURCE_CONTINUE;
+	}
+
+	/* Not accepting anything else. */
+	close(fd);
+	unlink(csname);
+
+	/* We exit if this fails. */
+	ninfo("about to recvfd from connfd: %d", connfd);
+	console = recvfd(connfd);
+
+	ninfo("console = {.name = '%s'; .fd = %d}", console.name, console.fd);
+	free(console.name);
+
+	/* We change the terminal settings to match kube settings */
+	if (tcgetattr(console.fd, &tset) == -1)
+		pexit("Failed to get console terminal settings");
+
+	tset.c_oflag |= ONLCR;
+
+	if (tcsetattr(console.fd, TCSANOW, &tset) == -1)
+		pexit("Failed to set console terminal settings");
+
+	/* We only have a single fd for both pipes, so we just treat it as
+	 * stdout. stderr is ignored. */
+	masterfd_stdin = console.fd;
+	masterfd_stdout = console.fd;
+
+	/* Clean up everything */
+	close(connfd);
+
+	return G_SOURCE_CONTINUE;
+}
+
+static void
+runtime_exit_cb (G_GNUC_UNUSED GPid pid, int status, G_GNUC_UNUSED gpointer user_data)
+{
+	runtime_status = status;
+	g_main_loop_quit (main_loop);
+}
+
+static void
+container_exit_cb (G_GNUC_UNUSED GPid pid, int status, G_GNUC_UNUSED gpointer user_data)
+{
+	ninfo("container %d exited with status %d\n", pid, status);
+	container_status = status;
+	g_main_loop_quit (main_loop);
+}
+
+static void write_sync_fd(int sync_pipe_fd, int res, const char *message)
+{
+	_cleanup_free_ char *escaped_message = NULL;
+	_cleanup_free_ char *json = NULL;
+	const char *res_key;
+	ssize_t len;
+
+	if (sync_pipe_fd == -1)
+		return;
+
+	if (opt_exec)
+		res_key = "exit_code";
+	else
+		res_key = "pid";
+
+	if (message) {
+		escaped_message = escape_json_string(message);
+		json = g_strdup_printf ("{\"%s\": %d, \"message\": \"%s\"}\n", res_key, res, escaped_message);
+	} else {
+		json = g_strdup_printf ("{\"%s\": %d}\n", res_key, res);
+	}
+
+	len = strlen(json);
+	if (write_all(sync_pipe_fd, json, len) != len) {
+		pexit("Unable to send container stderr message to parent");
+	}
+}
+
+static char *setup_console_socket(void)
+{
+	struct sockaddr_un addr = {0};
+	_cleanup_free_ const char *tmpdir = g_get_tmp_dir();
+	_cleanup_free_ char *csname = g_build_filename(tmpdir, "conmon-term.XXXXXX", NULL);
+	/*
+	 * Generate a temporary name. Is this unsafe? Probably, but we can
+	 * replace it with a rename(2) setup if necessary.
+	 */
+
+	int unusedfd = g_mkstemp(csname);
+	if (unusedfd < 0)
+		pexit("Failed to generate random path for console-socket");
+	close(unusedfd);
+
+	addr.sun_family = AF_UNIX;
+	strncpy(addr.sun_path, csname, sizeof(addr.sun_path)-1);
+
+	ninfo("addr{sun_family=AF_UNIX, sun_path=%s}", addr.sun_path);
+
+	/* Bind to the console socket path. */
+	console_socket_fd = socket(AF_UNIX, SOCK_STREAM|SOCK_CLOEXEC, 0);
+	if (console_socket_fd < 0)
+		pexit("Failed to create console-socket");
+	if (fchmod(console_socket_fd, 0700))
+		pexit("Failed to change console-socket permissions");
+	/* XXX: This should be handled with a rename(2). */
+	if (unlink(csname) < 0)
+		pexit("Failed to unlink temporary random path");
+	if (bind(console_socket_fd, (struct sockaddr *) &addr, sizeof(addr)) < 0)
+		pexit("Failed to bind to console-socket");
+	if (listen(console_socket_fd, 128) < 0)
+		pexit("Failed to listen on console-socket");
+
+	return g_strdup(csname);
+}
+
+static char *setup_attach_socket(void)
+{
+	_cleanup_free_ char *attach_sock_path = NULL;
+	char *attach_symlink_dir_path;
+	struct sockaddr_un attach_addr = {0};
+	attach_addr.sun_family = AF_UNIX;
+
+	/*
+	 * Create a symlink so we don't exceed unix domain socket
+	 * path length limit.
+	 */
+	attach_symlink_dir_path = g_build_filename(opt_socket_path, opt_cuuid, NULL);
+	if (unlink(attach_symlink_dir_path) == -1 && errno != ENOENT)
+		pexit("Failed to remove existing symlink for attach socket directory");
+
+	if (symlink(opt_bundle_path, attach_symlink_dir_path) == -1)
+		pexit("Failed to create symlink for attach socket");
+
+	attach_sock_path = g_build_filename(opt_socket_path, opt_cuuid, "attach", NULL);
+	ninfo("attach sock path: %s", attach_sock_path);
+
+	strncpy(attach_addr.sun_path, attach_sock_path, sizeof(attach_addr.sun_path) - 1);
+	ninfo("addr{sun_family=AF_UNIX, sun_path=%s}", attach_addr.sun_path);
+
+	/*
+	 * We make the socket non-blocking to avoid a race where client aborts connection
+	 * before the server gets a chance to call accept. In that scenario, the server
+	 * accept blocks till a new client connection comes in.
+	 */
+	attach_socket_fd = socket(AF_UNIX, SOCK_SEQPACKET|SOCK_NONBLOCK|SOCK_CLOEXEC, 0);
+	if (attach_socket_fd == -1)
+		pexit("Failed to create attach socket");
+
+	if (fchmod(attach_socket_fd, 0700))
+		pexit("Failed to change attach socket permissions");
+
+	if (bind(attach_socket_fd, (struct sockaddr *)&attach_addr, sizeof(struct sockaddr_un)) == -1)
+		pexit("Failed to bind attach socket: %s", attach_sock_path);
+
+	if (listen(attach_socket_fd, 10) == -1)
+		pexit("Failed to listen on attach socket: %s", attach_sock_path);
+
+	g_unix_fd_add (attach_socket_fd, G_IO_IN, attach_cb, NULL);
+
+	return attach_symlink_dir_path;
+}
+
+static void setup_terminal_control_fifo()
+{
+	_cleanup_free_ char *ctl_fifo_path = g_build_filename(opt_bundle_path, "ctl", NULL);
+	ninfo("ctl fifo path: %s", ctl_fifo_path);
+
+	/* Setup fifo for reading in terminal resize and other stdio control messages */
+
+	if (mkfifo(ctl_fifo_path, 0666) == -1)
+		pexit("Failed to mkfifo at %s", ctl_fifo_path);
+
+	terminal_ctrl_fd = open(ctl_fifo_path, O_RDONLY|O_NONBLOCK|O_CLOEXEC);
+	if (terminal_ctrl_fd == -1)
+		pexit("Failed to open control fifo");
+
+	/*
+	 * Open a dummy writer to prevent getting flood of POLLHUPs when
+	 * last writer closes.
+	 */
+	int dummyfd = open(ctl_fifo_path, O_WRONLY|O_CLOEXEC);
+	if (dummyfd == -1)
+		pexit("Failed to open dummy writer for fifo");
+
+	g_unix_fd_add (terminal_ctrl_fd, G_IO_IN, ctrl_cb, NULL);
+
+	ninfo("terminal_ctrl_fd: %d", terminal_ctrl_fd);
+}
+
+static void setup_oom_handling(int container_pid)
+{
+	/* Setup OOM notification for container process */
+	_cleanup_free_ char *memory_cgroup_path = process_cgroup_subsystem_path(container_pid, "memory");
+	_cleanup_close_ int cfd = -1;
+	int ofd = -1; /* Not closed */
+	if (!memory_cgroup_path) {
+		nexit("Failed to get memory cgroup path");
+	}
+
+	_cleanup_free_ char *memory_cgroup_file_path = g_build_filename(memory_cgroup_path, "cgroup.event_control", NULL);
+
+	if ((cfd = open(memory_cgroup_file_path, O_WRONLY | O_CLOEXEC)) == -1) {
+		nwarn("Failed to open %s", memory_cgroup_file_path);
+		return;
+	}
+
+	_cleanup_free_ char *memory_cgroup_file_oom_path = g_build_filename(memory_cgroup_path, "memory.oom_control", NULL);
+	if ((ofd = open(memory_cgroup_file_oom_path, O_RDONLY | O_CLOEXEC)) == -1)
+		pexit("Failed to open %s", memory_cgroup_file_oom_path);
+
+	if ((oom_event_fd = eventfd(0, EFD_CLOEXEC)) == -1)
+		pexit("Failed to create eventfd");
+
+	_cleanup_free_ char *data = g_strdup_printf("%d %d", oom_event_fd, ofd);
+	if (write_all(cfd, data, strlen(data)) < 0)
+		pexit("Failed to write to cgroup.event_control");
+
+	g_unix_fd_add (oom_event_fd, G_IO_IN, oom_cb, NULL);
+}
+
+int main(int argc, char *argv[])
+{
+	int ret;
+	char cwd[PATH_MAX];
+	_cleanup_free_ char *default_pid_file = NULL;
+	_cleanup_free_ char *csname = NULL;
+	GError *err = NULL;
+	_cleanup_free_ char *contents = NULL;
+	int container_pid = -1;
+	pid_t main_pid, create_pid;
+	/* Used for !terminal cases. */
+	int slavefd_stdin = -1;
+	int slavefd_stdout = -1;
+	int slavefd_stderr = -1;
+	char buf[BUF_SIZE];
+	int num_read;
+	int sync_pipe_fd = -1;
+	int start_pipe_fd = -1;
+	GError *error = NULL;
+	GOptionContext *context;
+        GPtrArray *runtime_argv = NULL;
+	_cleanup_close_ int dev_null_r = -1;
+	_cleanup_close_ int dev_null_w = -1;
+	int fds[2];
+
+	main_loop = g_main_loop_new (NULL, FALSE);
+
+	/* Command line parameters */
+	context = g_option_context_new("- conmon utility");
+	g_option_context_add_main_entries(context, opt_entries, "conmon");
+	if (!g_option_context_parse(context, &argc, &argv, &error)) {
+	        g_print("option parsing failed: %s\n", error->message);
+	        exit(1);
+	}
+
+	if (opt_cid == NULL)
+		nexit("Container ID not provided. Use --cid");
+
+	if (!opt_exec && opt_cuuid == NULL)
+		nexit("Container UUID not provided. Use --cuuid");
+
+	if (opt_runtime_path == NULL)
+		nexit("Runtime path not provided. Use --runtime");
+
+	if (!opt_exec && opt_exit_dir == NULL)
+		nexit("Container exit directory not provided. Use --exit-dir");
+
+	if (opt_bundle_path == NULL && !opt_exec) {
+		if (getcwd(cwd, sizeof(cwd)) == NULL) {
+			nexit("Failed to get working directory");
+		}
+		opt_bundle_path = cwd;
+	}
+
+	dev_null_r = open("/dev/null", O_RDONLY | O_CLOEXEC);
+	if (dev_null_r < 0)
+		pexit("Failed to open /dev/null");
+
+	dev_null_w = open("/dev/null", O_WRONLY | O_CLOEXEC);
+	if (dev_null_w < 0)
+		pexit("Failed to open /dev/null");
+
+	if (opt_exec && opt_exec_process_spec == NULL) {
+		nexit("Exec process spec path not provided. Use --exec-process-spec");
+	}
+
+	if (opt_pid_file == NULL) {
+		default_pid_file = g_strdup_printf ("%s/pidfile-%s", cwd, opt_cid);
+		opt_pid_file = default_pid_file;
+	}
+
+	if (opt_log_path == NULL)
+		nexit("Log file path not provided. Use --log-path");
+
+	start_pipe_fd = get_pipe_fd_from_env("_OCI_STARTPIPE");
+	if (start_pipe_fd >= 0) {
+		/* Block for an initial write to the start pipe before
+		   spawning any childred or exiting, to ensure the
+		   parent can put us in the right cgroup. */
+		read(start_pipe_fd, buf, BUF_SIZE);
+		close(start_pipe_fd);
+	}
+
+	/* In the create-container case we double-fork in
+	   order to disconnect from the parent, as we want to
+	   continue in a daemon-like way */
+	main_pid = fork();
+	if (main_pid < 0) {
+		pexit("Failed to fork the create command");
+	} else if (main_pid != 0) {
+		exit(0);
+	}
+
+	/* Disconnect stdio from parent. We need to do this, because
+	   the parent is waiting for the stdout to end when the intermediate
+	   child dies */
+	if (dup2(dev_null_r, STDIN_FILENO) < 0)
+		pexit("Failed to dup over stdin");
+	if (dup2(dev_null_w, STDOUT_FILENO) < 0)
+		pexit("Failed to dup over stdout");
+	if (dup2(dev_null_w, STDERR_FILENO) < 0)
+		pexit("Failed to dup over stderr");
+
+	/* Create a new session group */
+	setsid();
+
+	/* Environment variables */
+	sync_pipe_fd = get_pipe_fd_from_env("_OCI_SYNCPIPE");
+
+	/* Open the log path file. */
+	log_fd = open(opt_log_path, O_WRONLY | O_APPEND | O_CREAT | O_CLOEXEC, 0600);
+	if (log_fd < 0)
+		pexit("Failed to open log file");
+
+	/*
+	 * Set self as subreaper so we can wait for container process
+	 * and return its exit code.
+	 */
+	ret = prctl(PR_SET_CHILD_SUBREAPER, 1, 0, 0, 0);
+	if (ret != 0) {
+		pexit("Failed to set as subreaper");
+	}
+
+	if (opt_terminal) {
+		csname = setup_console_socket();
+	} else {
+
+		/*
+		 * Create a "fake" master fd so that we can use the same epoll code in
+		 * both cases. The slavefd_*s will be closed after we dup over
+		 * everything.
+		 *
+		 * We use pipes here because open(/dev/std{out,err}) will fail if we
+		 * used anything else (and it wouldn't be a good idea to create a new
+		 * pty pair in the host).
+		 */
+
+		if (opt_stdin) {
+			if (pipe2(fds, O_CLOEXEC) < 0)
+				pexit("Failed to create !terminal stdin pipe");
+
+			masterfd_stdin = fds[1];
+			slavefd_stdin = fds[0];
+		}
+
+		if (pipe2(fds, O_CLOEXEC) < 0)
+			pexit("Failed to create !terminal stdout pipe");
+
+		masterfd_stdout = fds[0];
+		slavefd_stdout = fds[1];
+	}
+
+	/* We always create a stderr pipe, because that way we can capture
+	   runc stderr messages before the tty is created */
+	if (pipe2(fds, O_CLOEXEC) < 0)
+		pexit("Failed to create stderr pipe");
+
+	masterfd_stderr = fds[0];
+	slavefd_stderr = fds[1];
+
+	runtime_argv = g_ptr_array_new();
+	add_argv(runtime_argv,
+		 opt_runtime_path,
+		 NULL);
+
+	/* Generate the cmdline. */
+	if (!opt_exec && opt_systemd_cgroup)
+		add_argv(runtime_argv,
+			 "--systemd-cgroup",
+			 NULL);
+
+	if (opt_exec) {
+		add_argv(runtime_argv,
+			 "exec", "-d",
+			 "--pid-file", opt_pid_file,
+			 NULL);
+        } else {
+		add_argv(runtime_argv,
+			 "create",
+			 "--bundle", opt_bundle_path,
+			 "--pid-file", opt_pid_file,
+			 NULL);
+	}
+
+	if (!opt_exec && opt_no_pivot) {
+		add_argv(runtime_argv,
+			"--no-pivot",
+			NULL);
+	}
+
+	if (csname != NULL) {
+		add_argv(runtime_argv,
+			 "--console-socket", csname,
+			 NULL);
+	}
+
+	/* Set the exec arguments. */
+	if (opt_exec) {
+		add_argv(runtime_argv,
+			 "--process", opt_exec_process_spec,
+			 NULL);
+	}
+
+	/* Container name comes last. */
+	add_argv(runtime_argv, opt_cid, NULL);
+	end_argv(runtime_argv);
+
+	/*
+	 * We have to fork here because the current runC API dups the stdio of the
+	 * calling process over the container's fds. This is actually *very bad*
+	 * but is currently being discussed for change in
+	 * https://github.com/opencontainers/runtime-spec/pull/513. Hopefully this
+	 * won't be the case for very long.
+	 */
+
+	/* Create our container. */
+	create_pid = fork();
+	if (create_pid < 0) {
+		pexit("Failed to fork the create command");
+	} else if (!create_pid) {
+		/* FIXME: This results in us not outputting runc error messages to crio's log. */
+		if (slavefd_stdin < 0)
+			slavefd_stdin = dev_null_r;
+		if (dup2(slavefd_stdin, STDIN_FILENO) < 0)
+			pexit("Failed to dup over stdout");
+
+		if (slavefd_stdout < 0)
+			slavefd_stdout = dev_null_w;
+		if (dup2(slavefd_stdout, STDOUT_FILENO) < 0)
+			pexit("Failed to dup over stdout");
+
+		if (slavefd_stderr < 0)
+			slavefd_stderr = slavefd_stdout;
+		if (dup2(slavefd_stderr, STDERR_FILENO) < 0)
+			pexit("Failed to dup over stderr");
+
+		execv(g_ptr_array_index(runtime_argv,0), (char **)runtime_argv->pdata);
+		exit(127);
+	}
+
+	g_ptr_array_free (runtime_argv, TRUE);
+
+	/* The runtime has that fd now. We don't need to touch it anymore. */
+	close(slavefd_stdin);
+	close(slavefd_stdout);
+	close(slavefd_stderr);
+
+	/* Map pid to its handler.  */
+	GHashTable *pid_to_handler = g_hash_table_new (g_int_hash, g_int_equal);
+	g_hash_table_insert (pid_to_handler, &create_pid, runtime_exit_cb);
+
+	/*
+	 * Glib does not support SIGCHLD so use SIGUSR1 with the same semantic.  We will
+         * catch SIGCHLD and raise(SIGUSR1) in the signal handler.
+	 */
+	g_unix_signal_add (SIGUSR1, on_sigusr1_cb, pid_to_handler);
+
+	if (signal(SIGCHLD, on_sigchld) == SIG_ERR)
+		pexit("Failed to set handler for SIGCHLD");
+
+	ninfo("about to waitpid: %d", create_pid);
+	if (csname != NULL) {
+		guint terminal_watch = g_unix_fd_add (console_socket_fd, G_IO_IN, terminal_accept_cb, csname);
+		/* Process any SIGCHLD we may have missed before the signal handler was in place.  */
+		check_child_processes (pid_to_handler);
+		g_main_loop_run (main_loop);
+		g_source_remove (terminal_watch);
+	} else {
+		int ret;
+		/* Wait for our create child to exit with the return code. */
+		do
+			ret = waitpid(create_pid, &runtime_status, 0);
+		while (ret < 0 && errno == EINTR);
+		if (ret < 0) {
+			int old_errno = errno;
+			kill(create_pid, SIGKILL);
+			errno = old_errno;
+			pexit("Failed to wait for `runtime %s`", opt_exec ? "exec" : "create");
+		}
+
+	}
+
+	if (!WIFEXITED(runtime_status) || WEXITSTATUS(runtime_status) != 0) {
+		if (sync_pipe_fd > 0) {
+			/*
+			 * Read from container stderr for any error and send it to parent
+			 * We send -1 as pid to signal to parent that create container has failed.
+			 */
+			num_read = read(masterfd_stderr, buf, BUF_SIZE);
+			if (num_read > 0) {
+				buf[num_read] = '\0';
+				write_sync_fd(sync_pipe_fd, -1, buf);
+			}
+		}
+		nexit("Failed to create container: exit status %d", WEXITSTATUS(runtime_status));
+	}
+
+	if (opt_terminal && masterfd_stdout == -1)
+		nexit("Runtime did not set up terminal");
+
+	/* Read the pid so we can wait for the process to exit */
+	g_file_get_contents(opt_pid_file, &contents, NULL, &err);
+	if (err) {
+		nwarn("Failed to read pidfile: %s", err->message);
+		g_error_free(err);
+		exit(1);
+	}
+
+	container_pid = atoi(contents);
+	ninfo("container PID: %d", container_pid);
+
+	g_hash_table_insert (pid_to_handler, &container_pid, container_exit_cb);
+
+	/* Setup endpoint for attach */
+	_cleanup_free_ char *attach_symlink_dir_path = NULL;
+	if (!opt_exec) {
+		attach_symlink_dir_path = setup_attach_socket();
+	}
+
+	if (!opt_exec) {
+		setup_terminal_control_fifo();
+	}
+
+	/* Send the container pid back to parent */
+	if (!opt_exec) {
+		write_sync_fd(sync_pipe_fd, container_pid, NULL);
+	}
+
+	setup_oom_handling(container_pid);
+
+	if (masterfd_stdout >= 0) {
+		g_unix_fd_add (masterfd_stdout, G_IO_IN, stdio_cb, GINT_TO_POINTER(STDOUT_PIPE));
+	}
+	if (masterfd_stderr >= 0) {
+		g_unix_fd_add (masterfd_stderr, G_IO_IN, stdio_cb, GINT_TO_POINTER(STDERR_PIPE));
+	}
+
+	if (opt_timeout > 0) {
+		g_timeout_add_seconds (opt_timeout, timeout_cb, NULL);
+	}
+
+	check_child_processes(pid_to_handler);
+
+	g_main_loop_run (main_loop);
+
+	/* Drain stdout and stderr */
+	if (masterfd_stdout != -1) {
+		g_unix_set_fd_nonblocking(masterfd_stdout, TRUE, NULL);
+		while (read_stdio(masterfd_stdout, STDOUT_PIPE, NULL))
+			;
+	}
+	if (masterfd_stderr != -1) {
+		g_unix_set_fd_nonblocking(masterfd_stderr, TRUE, NULL);
+		while (read_stdio(masterfd_stderr, STDERR_PIPE, NULL))
+			;
+	}
+
+	int exit_status = -1;
+	const char *exit_message = NULL;
+
+	if (timed_out) {
+		kill(container_pid, SIGKILL);
+		exit_message = "command timed out";
+	} else {
+		exit_status = WEXITSTATUS(container_status);
+	}
+
+	if (!opt_exec) {
+		_cleanup_free_ char *status_str = g_strdup_printf("%d", exit_status);
+		_cleanup_free_ char *exit_file_path = g_build_filename(opt_exit_dir, opt_cid, NULL);
+		if (!g_file_set_contents(exit_file_path, status_str, -1, &err))
+			nexit("Failed to write %s to exit file: %s\n",
+			      status_str, err->message);
+	} else {
+		/* Send the command exec exit code back to the parent */
+		write_sync_fd(sync_pipe_fd, exit_status, exit_message);
+	}
+
+	if (attach_symlink_dir_path != NULL &&
+	    unlink(attach_symlink_dir_path) == -1 && errno != ENOENT) {
+		pexit("Failed to remove symlink for attach socket directory");
+	}
+
+	return EXIT_SUCCESS;
+}