erts: Refactor common parts out of run_erl and to_erl

This is in preperation for writing ose version of run_erl and to_erl

8 files changed, 1572 insertions, 11 deletions

diff --git a/erts/etc/common/Makefile.in b/erts/etc/common/Makefile.in
index d7fe75ce6f..f5df53ec01 100644
--- a/erts/etc/common/Makefile.in
+++ b/erts/etc/common/Makefile.in
@@ -254,7 +254,9 @@ endif
 	rm -f $(ERL_TOP)/erts/obj*/$(TARGET)/run_erl.o
 	rm -f $(ERL_TOP)/erts/obj*/$(TARGET)/to_erl.o
 	rm -f $(ERL_TOP)/erts/obj*/$(TARGET)/dyn_erl.o
-	rm -f $(ERL_TOP)/erts/obj*/$(TARGET)/safe_string.o	
+	rm -f $(ERL_TOP)/erts/obj*/$(TARGET)/safe_string.o
+	rm -f $(ERL_TOP)/erts/obj*/$(TARGET)/run_erl_common.o
+	rm -f $(ERL_TOP)/erts/obj*/$(TARGET)/to_erl_common.o
 	rm -f $(ERL_TOP)/erts/obj*/$(TARGET)/typer.o
 	rm -f $(ERL_TOP)/erts/obj*/$(TARGET)/ct_run.o
 	rm -f $(ERL_TOP)/erts/obj*/$(TARGET)/vxcall.o
@@ -399,24 +401,28 @@ $(BINDIR)/inet_gethost@EXEEXT@: $(OBJDIR)/inet_gethost.o $(ENTRY_OBJ) $(ERTS_LIB
 	$(ld_verbose)$(PURIFY) $(LD) $(LDFLAGS) $(ENTRY_LDFLAGS) -o $@ $(OBJDIR)/inet_gethost.o $(ENTRY_OBJ) $(LIBS) $(ERTS_INTERNAL_LIBS)
 
 # run_erl
-$(BINDIR)/run_erl: $(OBJDIR)/safe_string.o $(OBJDIR)/run_erl.o
-	$(V_LD) $(LDFLAGS) -o $@ $(OBJDIR)/safe_string.o $(OBJDIR)/run_erl.o $(LIBS) $(ERTS_INTERNAL_LIBS)
-$(OBJDIR)/run_erl.o: ../unix/run_erl.c $(RC_GENERATED)
-	$(V_CC) $(CFLAGS) -o $@ -c ../unix/run_erl.c
+$(BINDIR)/run_erl: $(OBJDIR)/safe_string.o $(OBJDIR)/run_erl.o $(OBJDIR)/run_erl_common.o
+	$(V_LD) $(LDFLAGS) -o $@ $^ $(LIBS)
+$(OBJDIR)/run_erl.o: ../unix/run_erl.c ../common/run_erl_common.h $(RC_GENERATED)
+	$(V_CC) $(CFLAGS) -I ../common/ -o $@ -c ../unix/run_erl.c
+$(OBJDIR)/run_erl_common.o: ../common/run_erl_common.c ../common/run_erl_common.h $(RC_GENERATED)
+	$(V_CC) $(CFLAGS) -o $@ -c $<
 
 # to_erl
-$(BINDIR)/to_erl: $(OBJDIR)/safe_string.o $(OBJDIR)/to_erl.o
-	$(V_LD) $(LDFLAGS) -o $@  $(OBJDIR)/safe_string.o $(OBJDIR)/to_erl.o
-$(OBJDIR)/to_erl.o: ../unix/to_erl.c $(RC_GENERATED)
-	$(V_CC) $(CFLAGS) -o $@ -c ../unix/to_erl.c
+$(BINDIR)/to_erl: $(OBJDIR)/safe_string.o $(OBJDIR)/to_erl.o $(OBJDIR)/to_erl_common.o
+	$(V_LD) $(LDFLAGS) -o $@  $^
+$(OBJDIR)/to_erl.o: ../unix/to_erl.c ../common/safe_string.h $(RC_GENERATED)
+	$(V_CC) $(CFLAGS) -I ../common/ -o $@ -c ../unix/to_erl.c
+$(OBJDIR)/to_erl_common.o: ../common/to_erl_common.c ../common/to_erl_common.h $(RC_GENERATED)
+	$(V_CC) $(CFLAGS) -o $@ -c $<
 
 # dyn_erl
 $(BINDIR)/dyn_erl: $(OBJDIR)/safe_string.o $(OBJDIR)/dyn_erl.o
 	$(V_LD) $(LDFLAGS) -o $@  $(OBJDIR)/safe_string.o $(OBJDIR)/dyn_erl.o
 $(OBJDIR)/dyn_erl.o: ../unix/dyn_erl.c $(RC_GENERATED)
 	$(V_CC) $(CFLAGS) -o $@ -c ../unix/dyn_erl.c
-$(OBJDIR)/safe_string.o: ../unix/safe_string.c $(RC_GENERATED)
-	$(V_CC) $(CFLAGS) -o $@ -c ../unix/safe_string.c
+$(OBJDIR)/safe_string.o: ../common/safe_string.c $(RC_GENERATED)
+	$(V_CC) $(CFLAGS) -o $@ -c ../common/safe_string.c
 
 ifneq ($(TARGET),win32)
 $(BINDIR)/$(ERLEXEC): $(OBJDIR)/$(ERLEXEC).o $(ERTS_LIB)
diff --git a/erts/etc/common/run_erl_common.c b/erts/etc/common/run_erl_common.c
new file mode 100644
index 0000000000..dc899c5349
--- /dev/null
+++ b/erts/etc/common/run_erl_common.c
@@ -0,0 +1,610 @@
+/*
+ * %CopyrightBegin%
+ *
+ * Copyright Ericsson AB 2014. All Rights Reserved.
+ *
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * %CopyrightEnd%
+ */
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#endif
+
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <time.h>
+#include <unistd.h>
+
+#ifdef HAVE_SYSLOG_H
+#  include <syslog.h>
+#endif
+
+#include "run_erl_common.h"
+#include "safe_string.h"
+
+#define DEFAULT_LOG_GENERATIONS 5
+#define LOG_MAX_GENERATIONS     1000      /* No more than 1000 log files */
+#define LOG_MIN_GENERATIONS     2         /* At least two to switch between */
+#define DEFAULT_LOG_MAXSIZE     100000
+#define LOG_MIN_MAXSIZE         1000      /* Smallast value for changing log file */
+#define LOG_STUBNAME            "erlang.log."
+#define LOG_PERM                0664
+#define DEFAULT_LOG_ACTIVITY_MINUTES    5
+#define DEFAULT_LOG_ALIVE_MINUTES       15
+#define DEFAULT_LOG_ALIVE_FORMAT        "%a %b %e %T %Z %Y"
+#define ALIVE_BUFFSIZ                   1024
+
+#define STATUSFILENAME  "/run_erl.log"
+
+#define PIPE_STUBNAME   "erlang.pipe"
+#define PIPE_STUBLEN    strlen(PIPE_STUBNAME)
+#define PERM            (S_IWUSR | S_IRUSR | S_IWOTH | S_IROTH | S_IWGRP | S_IRGRP)
+
+#if !defined(O_SYNC)
+#define O_SYNC 0
+#define USE_FSYNC 1
+#endif
+
+/* prototypes */
+
+static int next_log(int log_num);
+static int prev_log(int log_num);
+static int find_next_log_num(void);
+static int open_log(int log_num, int flags);
+
+/* static data */
+static char statusfile[FILENAME_BUFSIZ];
+static char log_dir[FILENAME_BUFSIZ];
+static FILE *stdstatus = NULL;
+static int log_generations = DEFAULT_LOG_GENERATIONS;
+static int log_maxsize     = DEFAULT_LOG_MAXSIZE;
+static int log_activity_minutes = DEFAULT_LOG_ACTIVITY_MINUTES;
+static int log_alive_in_gmt = 0;
+static char log_alive_format[ALIVE_BUFFSIZ+1];
+static int run_daemon = 0;
+static unsigned protocol_ver = RUN_ERL_LO_VER; /* assume lowest to begin with */
+
+int erts_run_erl_log_alive_minutes = DEFAULT_LOG_ALIVE_MINUTES;
+
+/*
+ * Current log number and log fd
+ */
+static int log_num;
+static int lfd=0;
+
+
+/*
+ * getenv_int:
+ */
+static char *getenv_int(const char *name) {
+   return getenv(name);
+}
+
+/*
+ * next_log:
+ * Returns the index number that follows the given index number.
+ * (Wrapping after log_generations)
+ */
+static int next_log(int log_num) {
+  return log_num>=log_generations?1:log_num+1;
+}
+
+/*
+ * prev_log:
+ * Returns the index number that precedes the given index number.
+ * (Wrapping after log_generations)
+ */
+static int prev_log(int log_num) {
+  return log_num<=1?log_generations:log_num-1;
+}
+
+/*
+ * find_next_log_num()
+ * Searches through the log directory to check which logs that already
+ * exist. It finds the "hole" in the sequence, and returns the index
+ * number for the last log in the log sequence. If there is no hole, index
+ * 1 is returned.
+ */
+static int find_next_log_num(void) {
+  int i, next_gen, log_gen;
+  DIR *dirp;
+  struct dirent *direntp;
+  int log_exists[LOG_MAX_GENERATIONS+1];
+  int stub_len = strlen(LOG_STUBNAME);
+
+  /* Initialize exiting log table */
+
+  for(i=log_generations; i>=0; i--)
+    log_exists[i] = 0;
+  dirp = opendir(log_dir);
+  if(!dirp) {
+    ERRNO_ERR1(LOG_ERR,"Can't access log directory '%s'", log_dir);
+    exit(1);
+  }
+
+  /* Check the directory for existing logs */
+
+  while((direntp=readdir(dirp)) != NULL) {
+    if(strncmp(direntp->d_name,LOG_STUBNAME,stub_len)==0) {
+      int num = atoi(direntp->d_name+stub_len);
+      if(num < 1 || num > log_generations)
+	continue;
+      log_exists[num] = 1;
+    }
+  }
+  closedir(dirp);
+
+  /* Find out the next available log file number */
+
+  next_gen = 0;
+  for(i=log_generations; i>=0; i--) {
+    if(log_exists[i])
+      if(next_gen)
+	break;
+      else
+	;
+    else
+      next_gen = i;
+  }
+
+  /* Find out the current log file number */
+
+  if(next_gen)
+    log_gen = prev_log(next_gen);
+  else
+    log_gen = 1;
+
+  return log_gen;
+} /* find_next_log_num() */
+
+static int open_log(int log_num, int flags)
+{
+  char buf[FILENAME_MAX];
+  time_t now;
+  struct tm *tmptr;
+  char log_buffer[ALIVE_BUFFSIZ+1];
+
+  /* Remove the next log (to keep a "hole" in the log sequence) */
+  sn_printf(buf, sizeof(buf), "%s/%s%d",
+	    log_dir, LOG_STUBNAME, next_log(log_num));
+  unlink(buf);
+
+  /* Create or continue on the current log file */
+  sn_printf(buf, sizeof(buf), "%s/%s%d", log_dir, LOG_STUBNAME, log_num);
+
+  do {
+    lfd = open(buf, flags, LOG_PERM);
+  } while (lfd < 0 && errno == EINTR);
+
+  if(lfd <0){
+      ERRNO_ERR1(LOG_ERR,"Can't open log file '%s'.", buf);
+    exit(1);
+  }
+
+  /* Write a LOGGING STARTED and time stamp into the log file */
+  time(&now);
+  if (log_alive_in_gmt) {
+      tmptr = gmtime(&now);
+  } else {
+      tmptr = localtime(&now);
+  }
+  if (!strftime(log_buffer, ALIVE_BUFFSIZ, log_alive_format,
+		tmptr)) {
+      strn_cpy(log_buffer, sizeof(log_buffer),
+	      "(could not format time in 256 positions "
+	      "with current format string.)");
+  }
+  log_buffer[ALIVE_BUFFSIZ] = '\0';
+
+  sn_printf(buf, sizeof(buf), "\n=====\n===== LOGGING STARTED %s\n=====\n",
+	    log_buffer);
+  if (erts_run_erl_write_all(lfd, buf, strlen(buf)) < 0)
+      erts_run_erl_log_status("Error in writing to log.\n");
+
+#if USE_FSYNC
+  fsync(lfd);
+#endif
+
+  return lfd;
+}
+
+/* Instead of making sure basename exists, we do our own */
+char *simple_basename(char *path)
+{
+    char *ptr;
+    for (ptr = path; *ptr != '\0'; ++ptr) {
+	if (*ptr == '/') {
+	    path = ptr + 1;
+	}
+    }
+    return path;
+}
+
+ssize_t sf_read(int fd, void *buffer, size_t len) {
+    ssize_t n = 0;
+
+    do { n = read(fd, buffer, len); } while (n < 0 && errno == EINTR);
+
+    return n;
+}
+
+ssize_t sf_write(int fd, const void *buffer, size_t len) {
+    ssize_t n = 0;
+
+    do { n = write(fd, buffer, len); } while (n < 0 && errno == EINTR);
+
+    return n;
+}
+
+int sf_open(const char *path, int type, mode_t mode) {
+    int fd = 0;
+
+    do { fd = open(path, type, mode); } while(fd < 0 && errno == EINTR);
+
+    return fd;
+}
+
+int sf_close(int fd) {
+    int res = 0;
+
+    do { res = close(fd); } while(res < 0 && errno == EINTR);
+
+    return res;
+}
+
+/* Call write() until entire buffer has been written or error.
+ * Return len or -1.
+ */
+int erts_run_erl_write_all(int fd, const char* buf, int len)
+{
+    int left = len;
+    int written;
+    for (;;) {
+        do {
+	  written = write(fd,buf,left);
+	} while (written < 0 && errno == EINTR);
+	if (written == left) {
+	    return len;
+	}
+	if (written < 0) {
+	    return -1;
+	}
+	left -= written;
+	buf += written;
+    }
+    return written;
+}
+
+/* erts_run_erl_log_status()
+ * Prints the arguments to a status file
+ * Works like printf (see vfrpintf)
+ */
+void erts_run_erl_log_status(const char *format,...)
+{
+  va_list args;
+  time_t now;
+
+  if (stdstatus == NULL)
+    stdstatus = fopen(statusfile, "w");
+  if (stdstatus == NULL)
+    return;
+  now = time(NULL);
+  fprintf(stdstatus, "run_erl [%d] %s",
+	  (int)getpid(),
+	  ctime(&now));
+  va_start(args, format);
+  vfprintf(stdstatus, format, args);
+  va_end(args);
+  fflush(stdstatus);
+  return;
+}
+
+/* error_logf()
+ * Prints the arguments to stderr or syslog
+ * Works like printf (see vfprintf)
+ */
+void erts_run_erl_log_error(int priority, int line, const char *format, ...)
+{
+    va_list args;
+    va_start(args, format);
+
+#ifdef HAVE_SYSLOG_H
+    if (run_daemon) {
+	vsyslog(priority,format,args);
+    }
+    else
+#endif
+    {
+	time_t now = time(NULL);
+	fprintf(stderr, "run_erl:%d [%d] %s", line,
+		(int)getpid(),
+		ctime(&now));
+	vfprintf(stderr, format, args);
+    }
+    va_end(args);
+}
+
+/* erts_run_erl_log_write()
+ * Writes a message to lfd. If the current log file is full,
+ * a new log file is opened.
+ */
+int erts_run_erl_log_write(char* buf, size_t len)
+{
+  int size;
+  ssize_t res;
+  /* Decide if new logfile needed, and open if so */
+
+  size = lseek(lfd,0,SEEK_END);
+  if(size+len > log_maxsize) {
+    int res;
+    do {
+      res = close(lfd);
+    } while (res < 0 && errno == EINTR);
+    log_num = next_log(log_num);
+    lfd = open_log(log_num, O_RDWR|O_CREAT|O_TRUNC|O_SYNC);
+  }
+
+  /* Write to log file */
+
+  if ((res = erts_run_erl_write_all(lfd, buf, len)) < 0) {
+    erts_run_erl_log_status("Error in writing to log.\n");
+  }
+
+#if USE_FSYNC
+  fsync(lfd);
+#endif
+  return res;
+}
+
+int erts_run_erl_log_activity(int timeout,time_t now,time_t last_activity) {
+  char log_alive_buffer[ALIVE_BUFFSIZ+1];
+  char buf[BUFSIZ];
+
+  if (timeout || now - last_activity > log_activity_minutes*60) {
+    /* Either a time out: 15 minutes without action, */
+    /* or something is coming in right now, but it's a long time */
+    /* since last time, so let's write a time stamp this message */
+    struct tm *tmptr;
+    if (log_alive_in_gmt) {
+      tmptr = gmtime(&now);
+    } else {
+      tmptr = localtime(&now);
+    }
+    if (!strftime(log_alive_buffer, ALIVE_BUFFSIZ, log_alive_format,
+		  tmptr)) {
+      strn_cpy(log_alive_buffer, sizeof(log_alive_buffer),
+	       "(could not format time in 256 positions "
+	       "with current format string.)");
+    }
+    log_alive_buffer[ALIVE_BUFFSIZ] = '\0';
+
+    sn_printf(buf, sizeof(buf), "\n===== %s%s\n",
+	      timeout?"ALIVE ":"", log_alive_buffer);
+    return erts_run_erl_log_write(buf, strlen(buf));
+  }
+  return 0;
+}
+
+int erts_run_erl_log_open() {
+
+  log_num = find_next_log_num();
+  lfd = open_log(log_num, O_RDWR|O_APPEND|O_CREAT|O_SYNC);
+  return 0;
+}
+
+int erts_run_erl_log_init(int daemon, char* logdir) {
+  char *p;
+
+  /* Get values for LOG file handling from the environment */
+  if ((p = getenv_int("RUN_ERL_LOG_ALIVE_MINUTES"))) {
+      erts_run_erl_log_alive_minutes = atoi(p);
+      if (!erts_run_erl_log_alive_minutes) {
+	  ERROR1(LOG_ERR,"Minimum value for RUN_ERL_LOG_ALIVE_MINUTES is 1 "
+		 "(current value is %s)",p);
+      }
+      log_activity_minutes = erts_run_erl_log_alive_minutes / 3;
+      if (!log_activity_minutes) {
+	  ++log_activity_minutes;
+      }
+  }
+  if ((p = getenv_int(
+		   "RUN_ERL_LOG_ACTIVITY_MINUTES"))) {
+     log_activity_minutes = atoi(p);
+      if (!log_activity_minutes) {
+	  ERROR1(LOG_ERR,"Minimum value for RUN_ERL_LOG_ACTIVITY_MINUTES is 1 "
+		 "(current value is %s)",p);
+      }
+  }
+  if ((p = getenv_int("RUN_ERL_LOG_ALIVE_FORMAT"))) {
+      if (strlen(p) > ALIVE_BUFFSIZ) {
+	  ERROR1(LOG_ERR, "RUN_ERL_LOG_ALIVE_FORMAT can contain a maximum of "
+		 "%d characters", ALIVE_BUFFSIZ);
+      }
+      strn_cpy(log_alive_format, sizeof(log_alive_format), p);
+  } else {
+      strn_cpy(log_alive_format, sizeof(log_alive_format),
+	       DEFAULT_LOG_ALIVE_FORMAT);
+  }
+  if ((p = getenv_int("RUN_ERL_LOG_ALIVE_IN_UTC"))
+      && strcmp(p,"0")) {
+      ++log_alive_in_gmt;
+  }
+  if ((p = getenv_int("RUN_ERL_LOG_GENERATIONS"))) {
+    log_generations = atoi(p);
+    if (log_generations < LOG_MIN_GENERATIONS)
+      ERROR1(LOG_ERR,"Minimum RUN_ERL_LOG_GENERATIONS is %d",
+	     LOG_MIN_GENERATIONS);
+    if (log_generations > LOG_MAX_GENERATIONS)
+      ERROR1(LOG_ERR,"Maximum RUN_ERL_LOG_GENERATIONS is %d",
+	     LOG_MAX_GENERATIONS);
+  }
+
+  if ((p = getenv_int("RUN_ERL_LOG_MAXSIZE"))) {
+    log_maxsize = atoi(p);
+    if (log_maxsize < LOG_MIN_MAXSIZE)
+      ERROR1(LOG_ERR,"Minimum RUN_ERL_LOG_MAXSIZE is %d", LOG_MIN_MAXSIZE);
+  }
+
+  run_daemon = daemon;
+
+  strn_cpy(log_dir, sizeof(log_dir), logdir);
+  strn_cpy(statusfile, sizeof(statusfile), log_dir);
+  strn_cat(statusfile, sizeof(statusfile), STATUSFILENAME);
+
+  return 0;
+}
+
+/* create_fifo()
+ * Creates a new fifo with the given name and permission.
+ */
+static int create_fifo(char *name, int perm)
+{
+  if ((mkfifo(name, perm) < 0) && (errno != EEXIST))
+    return -1;
+  return 0;
+}
+
+/*
+ * w- and r_pipename have to be pre-allocated of atleast FILENAME_MAX size
+ */
+int erts_run_erl_open_fifo(char *pipename,char *w_pipename,char *r_pipename) {
+  int calculated_pipename = 0;
+  int highest_pipe_num = 0;
+  int fd;
+
+  /*
+   * Create FIFOs and open them
+   */
+
+  if(*pipename && pipename[strlen(pipename)-1] == '/') {
+    /* The user wishes us to find a unique pipe name in the specified */
+    /* directory */
+    DIR *dirp;
+    struct dirent *direntp;
+
+    calculated_pipename = 1;
+    dirp = opendir(pipename);
+    if(!dirp) {
+      ERRNO_ERR1(LOG_ERR,"Can't access pipe directory '%s'.", pipename);
+      return 1;
+    }
+
+    /* Check the directory for existing pipes */
+
+    while((direntp=readdir(dirp)) != NULL) {
+      if(strncmp(direntp->d_name,PIPE_STUBNAME,PIPE_STUBLEN)==0) {
+	int num = atoi(direntp->d_name+PIPE_STUBLEN+1);
+	if(num > highest_pipe_num)
+	  highest_pipe_num = num;
+      }
+    }
+    closedir(dirp);
+    strn_catf(pipename, BUFSIZ, "%s.%d",
+	      PIPE_STUBNAME, highest_pipe_num+1);
+  } /* if */
+
+  for(;;) {
+      /* write FIFO - is read FIFO for `to_erl' program */
+      strn_cpy(w_pipename, BUFSIZ, pipename);
+      strn_cat(w_pipename, BUFSIZ, ".r");
+      if (create_fifo(w_pipename, PERM) < 0) {
+	  ERRNO_ERR1(LOG_ERR,"Cannot create FIFO %s for writing.",
+		     w_pipename);
+	  return 1;
+      }
+
+      /* read FIFO - is write FIFO for `to_erl' program */
+      strn_cpy(r_pipename, BUFSIZ, pipename);
+      strn_cat(r_pipename, BUFSIZ, ".w");
+
+      /* Check that nobody is running run_erl already */
+      if ((fd = sf_open(r_pipename, O_WRONLY|DONT_BLOCK_PLEASE, 0)) >= 0) {
+	  /* Open as client succeeded -- run_erl is already running! */
+	  sf_close(fd);
+	  if (calculated_pipename) {
+	      ++highest_pipe_num;
+	      strn_catf(pipename, BUFSIZ, "%s.%d",
+			PIPE_STUBNAME, highest_pipe_num+1);
+	      continue;
+	  }
+	  fprintf(stderr, "Erlang already running on pipe %s.\n", pipename);
+	  return 1;
+      }
+      if (create_fifo(r_pipename, PERM) < 0) {
+	  ERRNO_ERR1(LOG_ERR,"Cannot create FIFO %s for reading.",
+		     r_pipename);
+	  return 1;
+      }
+      break;
+  }
+  return 0;
+}
+
+/* Extract any control sequences that are ment only for run_erl
+ * and should not be forwarded to the pty.
+ */
+int erts_run_erl_extract_ctrl_seq(char* buf, int len)
+{
+    static const char prefix[] = "\033_";
+    static const char suffix[] = "\033\\";
+    char* bufend = buf + len;
+    char* start = buf;
+    char* command;
+    char* end;
+
+    for (;;) {
+	start = find_str(start, bufend-start, prefix);
+	if (!start) break;
+
+	command = start + strlen(prefix);
+	end = find_str(command, bufend-command, suffix);
+	if (end) {
+	    unsigned col, row;
+	    if (sscanf(command,"version=%u", &PROTOCOL_VER)==1) {
+		/*fprintf(stderr,"to_erl v%u\n", protocol_ver);*/
+	    }
+	    else if (sscanf(command,"winsize=%u,%u", &col, &row)==2) {
+#ifdef TIOCSWINSZ
+	      struct winsize ws;
+	      ws.ws_col = col;
+	      ws.ws_row = row;
+	      if (ioctl(MFD, TIOCSWINSZ, &ws) < 0) {
+		ERRNO_ERR0(LOG_ERR,"Failed to set window size");
+	      }
+#endif
+	    }
+	    else {
+		ERROR2(LOG_ERR, "Ignoring unknown ctrl command '%.*s'\n",
+		       (int)(end-command), command);
+	    }
+
+	    /* Remove ctrl sequence from buf */
+	    end += strlen(suffix);
+	    memmove(start, end, bufend-end);
+	    bufend -= end - start;
+	}
+	else {
+	    ERROR2(LOG_ERR, "Missing suffix in ctrl sequence '%.*s'\n",
+		   (int)(bufend-start), start);
+	    break;
+	}
+    }
+    return bufend - buf;
+}
diff --git a/erts/etc/common/run_erl_common.h b/erts/etc/common/run_erl_common.h
new file mode 100644
index 0000000000..dca1af93f2
--- /dev/null
+++ b/erts/etc/common/run_erl_common.h
@@ -0,0 +1,95 @@
+/*
+ * %CopyrightBegin%
+ *
+ * Copyright Ericsson AB 2013. All Rights Reserved.
+ *
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * %CopyrightEnd%
+ */
+/*
+ * Functions that are common to both OSE and unix implementations of run_erl
+ */
+#ifndef ERL_RUN_ERL_LOG_H
+#define ERL_RUN_ERL_LOG_H
+
+#include <stdio.h>
+#include <time.h>
+#include <unistd.h>
+
+#include "run_erl_vsn.h"
+
+/* Log handling */
+int erts_run_erl_log_init(int run_daemon, char* logdir);
+int erts_run_erl_log_open(void);
+int erts_run_erl_log_close(void);
+int erts_run_erl_log_write(char *buff, size_t len);
+int erts_run_erl_log_activity(int timeout, time_t now, time_t last_activity);
+
+void erts_run_erl_log_status(const char *format,...);
+void erts_run_erl_log_error(int priority, int line, const char *format,...);
+
+int erts_run_erl_open_fifo(char *pipename,char *w_pipename,char *r_pipename);
+int erts_run_erl_log_alive_minutes(void);
+int erts_run_erl_extract_ctrl_seq(char* buf, int len);
+
+/* File operations */
+ssize_t sf_read(int fd, void *buffer, size_t len);
+ssize_t sf_write(int fd, const void *buffer, size_t len);
+int sf_open(const char *path, int type, mode_t mode);
+int sf_close(int fd);
+int erts_run_erl_write_all(int fd, const char* buf, int len);
+char *simple_basename(char *path);
+
+#ifndef LOG_ERR
+#define LOG_ERR NULL
+#endif
+
+#define ERROR0(Prio,Format) erts_run_erl_log_error(Prio,__LINE__,Format"\n")
+#define ERROR1(Prio,Format,A1) erts_run_erl_log_error(Prio,__LINE__,Format"\n",A1)
+#define ERROR2(Prio,Format,A1,A2) erts_run_erl_log_error(Prio,__LINE__,Format"\n",A1,A2)
+
+#ifdef HAVE_STRERROR
+#    define ADD_ERRNO(Format) "errno=%d '%s'\n"Format"\n",errno,strerror(errno)
+#else
+#    define ADD_ERRNO(Format) "errno=%d\n"Format"\n",errno
+#endif
+#define ERRNO_ERR0(Prio,Format) erts_run_erl_log_error(Prio,__LINE__,ADD_ERRNO(Format))
+#define ERRNO_ERR1(Prio,Format,A1) erts_run_erl_log_error(Prio,__LINE__,ADD_ERRNO(Format),A1)
+#define ERRNO_ERR2(Prio,Format,A1,A2) erts_run_erl_log_error(Prio,__LINE__,ADD_ERRNO(Format),A1,A2)
+
+/* defined in run_common.c */
+extern int erts_run_erl_log_alive_minutes;
+
+#define RUN_ERL_USAGE \
+  "%s (pipe_name|pipe_dir/) log_dir \"command [parameters ...]\"" \
+  "\n\nDESCRIPTION:\n"							\
+  "You may also set the environment variables RUN_ERL_LOG_GENERATIONS\n" \
+  "and RUN_ERL_LOG_MAXSIZE to the number of log files to use and the\n"	\
+  "size of the log file when to switch to the next log file\n"
+
+#ifndef FILENAME_MAX
+#define FILENAME_MAX 250
+#endif
+
+#define FILENAME_BUFSIZ FILENAME_MAX
+
+#ifdef O_NONBLOCK
+#  define DONT_BLOCK_PLEASE O_NONBLOCK
+#else
+#  define DONT_BLOCK_PLEASE O_NDELAY
+#  ifndef EAGAIN
+#    define EAGAIN -3898734
+#  endif
+#endif
+
+#endif
diff --git a/erts/etc/common/run_erl_vsn.h b/erts/etc/common/run_erl_vsn.h
new file mode 100644
index 0000000000..f6ac753bde
--- /dev/null
+++ b/erts/etc/common/run_erl_vsn.h
@@ -0,0 +1,29 @@
+/*
+ * %CopyrightBegin%
+ *
+ * Copyright Ericsson AB 2008-2009. All Rights Reserved.
+ *
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * %CopyrightEnd%
+ */
+
+/*
+ * The protocol version number used between to_erl and run_erl.
+ */
+#define RUN_ERL_HI_VER 1  /* My preferred protocol version */
+#define RUN_ERL_LO_VER 0  /* The lowest version I accept to talk with */
+
+/* Version history:
+ * 0: Older, without version handshake
+ * 1: R12B-3, version handshake + window size ctrl
+ */
diff --git a/erts/etc/common/safe_string.c b/erts/etc/common/safe_string.c
new file mode 100644
index 0000000000..b2f8814408
--- /dev/null
+++ b/erts/etc/common/safe_string.c
@@ -0,0 +1,122 @@
+/*
+ * %CopyrightBegin%
+ *
+ * Copyright Ericsson AB 2008-2009. All Rights Reserved.
+ *
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * %CopyrightEnd%
+ */
+/*
+ * Module: safe_string.c
+ *
+ * This is a bunch of generic string operation
+ * that are safe regarding buffer overflow.
+ *
+ * All string functions terminate the process with an error message
+ * on buffer overflow.
+ */
+
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#endif
+#include "safe_string.h"
+#include <stdio.h>
+#include <string.h>
+#include <stdarg.h>
+#include <stdlib.h>
+
+
+static void string_overflow_handler(const char* format, ...)
+{
+    va_list args;
+    va_start(args, format);
+    vfprintf(stderr,format,args);
+    va_end(args);
+    exit(1);
+}
+
+int vsn_printf(char* dst, size_t size, const char* format, va_list args)
+{
+    int ret = vsnprintf(dst, size, format, args);
+    if (ret >= size || ret < 0) {
+	string_overflow_handler("Buffer truncated '%s'\n",dst);
+    }
+    return ret;
+}
+
+int sn_printf(char* dst, size_t size, const char* format, ...)
+{
+    va_list args;
+    int ret;
+    va_start(args, format);
+    ret = vsn_printf(dst,size,format,args);
+    va_end(args);
+    return ret;
+}
+
+int strn_cpy(char* dst, size_t size, const char* src)
+{
+    return sn_printf(dst,size,"%s",src);
+}
+
+int strn_cat(char* dst, size_t size, const char* src)
+{
+    return strn_catf(dst,size,"%s",src);
+}
+
+int strn_catf(char* dst, size_t size, const char* format, ...)
+{
+    int ret;
+    va_list args;
+#ifdef _GNU_SOURCE
+    int len = strnlen(dst,size);
+#else
+    int len = strlen(dst);
+#endif
+
+    if (len >= size) {
+	string_overflow_handler("Buffer already overflowed '%.*s'\n",
+				size, dst);
+    }
+    va_start(args, format);
+    ret = vsn_printf(dst+len, size-len, format, args);
+    va_end(args);
+    return len+ret;
+}
+
+char* find_str(const char* haystack, int hsize, const char* needle)
+{
+    int i = 0;
+    int nsize = strlen(needle);
+    hsize -= nsize - 1;
+    for (i=0; i<hsize; i++) {
+	if (haystack[i]==needle[0] && strncmp(haystack+i,needle,nsize)==0) {
+	    return (char*)(haystack+i);
+	}
+    }
+    return NULL;
+}
+
+#ifndef HAVE_MEMMOVE
+void* memmove(void *dest, const void *src, size_t n)
+{
+    int i;
+    if (src > dest) {
+	for (i=0; i<n; i++) ((char*)dest)[i] = ((char*)src)[i];
+    }
+    else {
+	for (i=(int)(n-1); i>=0; i--) ((char*)dest)[i] = ((char*)src)[i];
+    }
+    return dest;
+}
+#endif /* HAVE_MEMMOVE */
diff --git a/erts/etc/common/safe_string.h b/erts/etc/common/safe_string.h
new file mode 100644
index 0000000000..ff063fe641
--- /dev/null
+++ b/erts/etc/common/safe_string.h
@@ -0,0 +1,64 @@
+/*
+ * %CopyrightBegin%
+ *
+ * Copyright Ericsson AB 2008-2009. All Rights Reserved.
+ *
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * %CopyrightEnd%
+ */
+/*
+ * Module: safe_string.h
+ *
+ * This is an interface to a bunch of generic string operation
+ * that are safe regarding buffer overflow.
+ *
+ * All string functions terminate the process with an error message
+ * on buffer overflow.
+ */
+
+#include <stdio.h>
+#include <stdarg.h>
+
+/* Like vsnprintf()
+ */
+int vsn_printf(char* dst, size_t size, const char* format, va_list args);
+
+/* Like snprintf()
+ */
+int sn_printf(char* dst, size_t size, const char* format, ...);
+
+/* Like strncpy()
+ * Returns length of copied string.
+ */
+int strn_cpy(char* dst, size_t size, const char* src);
+
+/* Almost like strncat()
+ * size is sizeof entire dst buffer.
+ * Returns length of resulting string.
+ */
+int strn_cat(char* dst, size_t size, const char* src);
+
+/* Combination of strncat() and snprintf()
+ * size is sizeof entire dst buffer.
+ * Returns length of resulting string.
+ */
+int strn_catf(char* dst, size_t size, const char* format, ...);
+
+/* Simular to strstr() but search size bytes of haystack
+ * without regard to '\0' characters.
+ */
+char* find_str(const char* haystack, int size, const char* needle);
+
+#ifndef HAVE_MEMMOVE
+void* memmove(void *dest, const void *src, size_t n);
+#endif
diff --git a/erts/etc/common/to_erl_common.c b/erts/etc/common/to_erl_common.c
new file mode 100644
index 0000000000..4c38877277
--- /dev/null
+++ b/erts/etc/common/to_erl_common.c
@@ -0,0 +1,607 @@
+/*
+ * %CopyrightBegin%
+ *
+ * Copyright Ericsson AB 1996-2013. All Rights Reserved.
+ *
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * %CopyrightEnd%
+ */
+/*
+ * Module: to_erl.c
+ *
+ * This module implements a process that opens two specified FIFOs, one
+ * for reading and one for writing; reads from its stdin, and writes what
+ * it has read to the write FIF0; reads from the read FIFO, and writes to
+ * its stdout.
+ *
+  ________                            _________
+ |        |--<-- pipe.r (fifo1) --<--|         |
+ | to_erl |                          | run_erl | (parent)
+ |________|-->-- pipe.w (fifo2) -->--|_________|
+                                          ^ master pty
+                                          |
+                                          | slave pty
+                                      ____V____
+                                     |         |
+                                     |  "erl"  | (child)
+                                     |_________|
+ */
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#endif
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <termios.h>
+#include <dirent.h>
+#include <signal.h>
+#include <errno.h>
+#ifdef HAVE_SYS_IOCTL_H
+#  include <sys/ioctl.h>
+#endif
+
+#include "to_erl_common.h"
+#include "run_erl_vsn.h"
+#include "safe_string.h"   /* strn_cpy, strn_catf, sn_printf, etc. */
+
+#if defined(O_NONBLOCK)
+# define DONT_BLOCK_PLEASE O_NONBLOCK
+#else
+# define DONT_BLOCK_PLEASE O_NDELAY
+# if !defined(EAGAIN)
+#  define EAGAIN -3898734
+# endif
+#endif
+
+#ifdef HAVE_STRERROR
+#  define STRERROR(x) strerror(x)
+#else
+#  define STRERROR(x) ""
+#endif
+
+#define noDEBUG
+
+#define PIPE_DIR        "/tmp/"
+#define PIPE_STUBNAME   "erlang.pipe"
+#define PIPE_STUBLEN    strlen(PIPE_STUBNAME)
+
+#ifdef DEBUG
+#define STATUS(s)  { fprintf(stderr, (s)); fflush(stderr); }
+#else
+#define STATUS(s)
+#endif
+
+#ifndef FILENAME_MAX
+#define FILENAME_MAX 250
+#endif
+
+static struct termios tty_smode, tty_rmode;
+static int tty_eof = 0;
+static int recv_sig = 0;
+static int protocol_ver = RUN_ERL_LO_VER; /* assume lowest to begin with */
+
+static int write_all(int fd, const char* buf, int len);
+static int window_size_seq(char* buf, size_t bufsz);
+static int version_handshake(char* buf, int len, int wfd);
+#ifdef DEBUG
+static void show_terminal_settings(struct termios *);
+#endif
+
+static void handle_ctrlc(int sig)
+{
+    /* Reinstall the handler, and signal break flag */
+    signal(SIGINT,handle_ctrlc);
+    recv_sig = SIGINT;
+}
+
+static void handle_sigwinch(int sig)
+{
+    recv_sig = SIGWINCH;
+}
+
+static void usage(char *pname)
+{
+    fprintf(stderr, "Usage: ");
+    fprintf(stderr,TO_ERL_USAGE,pname);
+}
+
+int to_erl(int argc, char **argv)
+{
+    char  FIFO1[FILENAME_MAX], FIFO2[FILENAME_MAX];
+    int i, len, wfd, rfd;
+    fd_set readfds;
+    char buf[BUFSIZ];
+    char pipename[FILENAME_MAX];
+    int pipeIx = 1;
+    int force_lock = 0;
+    int got_some = 0;
+
+    if (argc >= 2 && argv[1][0]=='-') {
+	switch (argv[1][1]) {
+	case 'h':
+	    usage(argv[0]);
+	    exit(1);
+	case 'F':
+	    force_lock = 1;
+	    break;
+	default:
+	    fprintf(stderr,"Invalid option '%s'\n",argv[1]);
+	    exit(1);
+	}
+	pipeIx = 2;
+    }
+
+#ifdef DEBUG
+    fprintf(stderr, "%s: pid is : %d\n", argv[0], (int)getpid());
+#endif
+
+    strn_cpy(pipename, sizeof(pipename),
+	     (argv[pipeIx] ? argv[pipeIx] : PIPE_DIR));
+
+    if(*pipename && pipename[strlen(pipename)-1] == '/') {
+	/* The user wishes us to find a pipe name in the specified */
+	/* directory */
+	int highest_pipe_num = 0;
+	DIR *dirp;
+	struct dirent *direntp;
+
+	dirp = opendir(pipename);
+	if(!dirp) {
+	    fprintf(stderr, "Can't access pipe directory %s: %s\n", pipename, strerror(errno));
+	    exit(1);
+	}
+
+	/* Check the directory for existing pipes */
+
+	while((direntp=readdir(dirp)) != NULL) {
+	    if(strncmp(direntp->d_name,PIPE_STUBNAME,PIPE_STUBLEN)==0) {
+		int num = atoi(direntp->d_name+PIPE_STUBLEN+1);
+		if(num > highest_pipe_num)
+		    highest_pipe_num = num;
+	    }
+	}
+	closedir(dirp);
+	strn_catf(pipename, sizeof(pipename), (highest_pipe_num?"%s.%d":"%s"),
+		  PIPE_STUBNAME, highest_pipe_num);
+    } /* if */
+
+    /* read FIFO */
+    sn_printf(FIFO1,sizeof(FIFO1),"%s.r",pipename);
+    /* write FIFO */
+    sn_printf(FIFO2,sizeof(FIFO2),"%s.w",pipename);
+
+    /* Check that nobody is running to_erl on this pipe already */
+    if ((wfd = open (FIFO1, O_WRONLY|DONT_BLOCK_PLEASE, 0)) >= 0) {
+	/* Open as server succeeded -- to_erl is already running! */
+	close(wfd);
+	fprintf(stderr, "Another to_erl process already attached to pipe "
+			"%s.\n", pipename);
+	if (force_lock) {
+	    fprintf(stderr, "But we proceed anyway by force (-F).\n");
+	}
+	else {
+	    exit(1);
+	}
+    }
+
+    if ((rfd = open (FIFO1, O_RDONLY|DONT_BLOCK_PLEASE, 0)) < 0) {
+#ifdef DEBUG
+	fprintf(stderr, "Could not open FIFO %s for reading.\n", FIFO1);
+#endif
+	fprintf(stderr, "No running Erlang on pipe %s: %s\n", pipename, strerror(errno));
+	exit(1);
+    }
+#ifdef DEBUG
+    fprintf(stderr, "to_erl: %s opened for reading\n", FIFO1);
+#endif
+
+    if ((wfd = open (FIFO2, O_WRONLY|DONT_BLOCK_PLEASE, 0)) < 0) {
+#ifdef DEBUG
+	fprintf(stderr, "Could not open FIFO %s for writing.\n", FIFO2);
+#endif
+	fprintf(stderr, "No running Erlang on pipe %s: %s\n", pipename, strerror(errno));
+	close(rfd);
+	exit(1);
+    }
+#ifdef DEBUG
+    fprintf(stderr, "to_erl: %s opened for writing\n", FIFO2);
+#endif
+
+    fprintf(stderr, "Attaching to %s (^D to exit)\n\n", pipename);
+
+    /* Set break handler to our handler */
+    signal(SIGINT,handle_ctrlc);
+
+    /*
+     * Save the current state of the terminal, and set raw mode.
+     */
+    if (tcgetattr(0, &tty_rmode) , 0) {
+	fprintf(stderr, "Cannot get terminals current mode\n");
+	exit(-1);
+    }
+    tty_smode = tty_rmode;
+    tty_eof = '\004'; /* Ctrl+D to exit */
+#ifdef DEBUG
+    show_terminal_settings(&tty_rmode);
+#endif
+    tty_smode.c_iflag =
+	1*BRKINT |/*Signal interrupt on break.*/
+	    1*IGNPAR |/*Ignore characters with parity errors.*/
+		1*ISTRIP |/*Strip character.*/
+		    0;
+
+#if 0
+0*IGNBRK |/*Ignore break condition.*/
+0*PARMRK |/*Mark parity errors.*/
+0*INPCK  |/*Enable input parity check.*/
+0*INLCR  |/*Map NL to CR on input.*/
+0*IGNCR  |/*Ignore CR.*/
+0*ICRNL  |/*Map CR to NL on input.*/
+0*IUCLC  |/*Map upper-case to lower-case on input.*/
+0*IXON   |/*Enable start/stop output control.*/
+0*IXANY  |/*Enable any character to restart output.*/
+0*IXOFF  |/*Enable start/stop input control.*/
+0*IMAXBEL|/*Echo BEL on input line too long.*/
+#endif
+
+    tty_smode.c_oflag =
+	1*OPOST  |/*Post-process output.*/
+	    1*ONLCR  |/*Map NL to CR-NL on output.*/
+#ifdef XTABS
+		1*XTABS  |/*Expand tabs to spaces. (Linux)*/
+#endif
+#ifdef OXTABS
+		    1*OXTABS  |/*Expand tabs to spaces. (FreeBSD)*/
+#endif
+#ifdef NL0
+			1*NL0    |/*Select newline delays*/
+#endif
+#ifdef CR0
+			    1*CR0    |/*Select carriage-return delays*/
+#endif
+#ifdef TAB0
+				1*TAB0   |/*Select horizontal tab delays*/
+#endif
+#ifdef BS0
+				    1*BS0    |/*Select backspace delays*/
+#endif
+#ifdef VT0
+					1*VT0    |/*Select vertical tab delays*/
+#endif
+#ifdef FF0
+					    1*FF0    |/*Select form feed delays*/
+#endif
+											    0;
+
+#if 0
+0*OLCUC  |/*Map lower case to upper on output.*/
+0*OCRNL  |/*Map CR to NL on output.*/
+0*ONOCR  |/*No CR output at column 0.*/
+0*ONLRET |/*NL performs CR function.*/
+0*OFILL  |/*Use fill characters for delay.*/
+0*OFDEL  |/*Fill is DEL, else NULL.*/
+0*NL1    |
+0*CR1    |
+0*CR2    |
+0*CR3    |
+0*TAB1   |
+0*TAB2   |
+0*TAB3   |/*Expand tabs to spaces.*/
+0*BS1    |
+0*VT1    |
+0*FF1    |
+#endif
+
+    /* JALI: removed setting the tty_smode.c_cflag flags, since this is not */
+    /* advisable if this is a *real* terminal, such as the console. In fact */
+    /* this may hang the entire machine, deep, deep down (signalling break */
+    /* or toggling the abort switch doesn't help) */
+
+    tty_smode.c_lflag =
+									0;
+
+#if 0
+0*ISIG   |/*Enable signals.*/
+0*ICANON |/*Canonical input (erase and kill processing).*/
+0*XCASE  |/*Canonical upper/lower presentation.*/
+0*ECHO   |/*Enable echo.*/
+0*ECHOE  |/*Echo erase character as BS-SP-BS.*/
+0*ECHOK  |/*Echo NL after kill character.*/
+0*ECHONL |/*Echo NL.*/
+0*NOFLSH |/*Disable flush after interrupt or quit.*/
+0*TOSTOP |/*Send SIGTTOU for background output.*/
+0*ECHOCTL|/*Echo control characters as ^char, delete as ^?.*/
+0*ECHOPRT|/*Echo erase character as character erased.*/
+0*ECHOKE |/*BS-SP-BS erase entire line on line kill.*/
+0*FLUSHO |/*Output is being flushed.*/
+0*PENDIN |/*Retype pending input at next read or input character.*/
+0*IEXTEN |/*Enable extended (implementation-defined) functions.*/
+#endif
+
+    tty_smode.c_cc[VMIN]      =0;/* Note that VMIN is the same as VEOF! */
+    tty_smode.c_cc[VTIME]     =0;/* Note that VTIME is the same as VEOL! */
+    tty_smode.c_cc[VINTR]     =3;
+
+    tcsetattr(0, TCSADRAIN, &tty_smode);
+
+#ifdef DEBUG
+    show_terminal_settings(&tty_smode);
+#endif
+    /*
+     * 	 "Write a ^L to the FIFO which causes the other end to redisplay
+     *    the input line."
+     * This does not seem to work as was intended in old comment above.
+     * However, this control character is now (R12B-3) used by run_erl
+     * to trigger the version handshaking between to_erl and run_erl
+     * at the start of every new to_erl-session.
+     */
+
+    if (write(wfd, "\014", 1) < 0) {
+	fprintf(stderr, "Error in writing ^L to FIFO.\n");
+    }
+
+    /*
+     * read and write
+     */
+    while (1) {
+	FD_ZERO(&readfds);
+	FD_SET(0, &readfds);
+	FD_SET(rfd, &readfds);
+	if (select(rfd + 1, &readfds, NULL, NULL, NULL) < 0) {
+	    if (recv_sig) {
+		FD_ZERO(&readfds);
+	    }
+	    else {
+		fprintf(stderr, "Error in select.\n");
+		break;
+	    }
+	}
+	len = 0;
+
+	/*
+	 * Read from terminal and write to FIFO
+         */
+	if (recv_sig) {
+	    switch (recv_sig) {
+	    case SIGINT:
+		fprintf(stderr, "[Break]\n\r");
+		buf[0] = '\003';
+		len = 1;
+		break;
+	    case SIGWINCH:
+		len = window_size_seq(buf,sizeof(buf));
+		break;
+	    default:
+		fprintf(stderr,"Unexpected signal: %u\n",recv_sig);
+	    }
+	    recv_sig = 0;
+	}
+	else if (FD_ISSET(0, &readfds)) {
+	    len = read(0, buf, sizeof(buf));
+	    if (len <= 0) {
+		close(rfd);
+		close(wfd);
+		if (len < 0) {
+		    fprintf(stderr, "Error in reading from stdin.\n");
+		} else {
+		    fprintf(stderr, "[EOF]\n\r");
+		}
+		break;
+	    }
+	    /* check if there is an eof character in input */
+	    for (i = 0; i < len && buf[i] != tty_eof; i++);
+	    if (buf[i] == tty_eof) {
+		fprintf(stderr, "[Quit]\n\r");
+		break;
+	    }
+	}
+
+	if (len) {
+#ifdef DEBUG
+	    if(write(1, buf, len));
+#endif
+	    if (write_all(wfd, buf, len) != len) {
+		fprintf(stderr, "Error in writing to FIFO.\n");
+		close(rfd);
+		close(wfd);
+		break;
+	    }
+	    STATUS("\" OK\r\n");
+	}
+
+	/*
+	 * Read from FIFO, write to terminal.
+	 */
+	if (FD_ISSET(rfd, &readfds)) {
+	    STATUS("FIFO read: ");
+	    len = read(rfd, buf, BUFSIZ);
+	    if (len < 0 && errno == EAGAIN) {
+		/*
+		 * No data this time, but the writing end of the FIFO is still open.
+		 * Do nothing.
+		 */
+		;
+	    } else if (len <= 0) {
+		/*
+		 * Either an error or end of file. In either case, break out
+		 * of the loop.
+		 */
+		close(rfd);
+		close(wfd);
+		if (len < 0) {
+		    fprintf(stderr, "Error in reading from FIFO.\n");
+		} else
+		    fprintf(stderr, "[End]\n\r");
+		break;
+	    } else {
+		if (!got_some) {
+		    if ((len=version_handshake(buf,len,wfd)) < 0) {
+			close(rfd);
+			close(wfd);
+			break;
+		    }
+		    if (protocol_ver >= 1) {
+			/* Tell run_erl size of terminal window */
+			signal(SIGWINCH, handle_sigwinch);
+			raise(SIGWINCH);
+		    }
+		    got_some = 1;
+		}
+
+		/*
+		 * We successfully read at least one character. Write what we got.
+		 */
+		STATUS("Terminal write: \"");
+		if (write_all(1, buf, len) != len) {
+		    fprintf(stderr, "Error in writing to terminal.\n");
+		    close(rfd);
+		    close(wfd);
+		    break;
+		}
+		STATUS("\" OK\r\n");
+	    }
+	}
+    }
+
+    /*
+     * Reset terminal characterstics
+     * XXX
+     */
+    tcsetattr(0, TCSADRAIN, &tty_rmode);
+    return 0;
+}
+
+/* Call write() until entire buffer has been written or error.
+ * Return len or -1.
+ */
+static int write_all(int fd, const char* buf, int len)
+{
+    int left = len;
+    int written;
+    while (left) {
+	written = write(fd,buf,left);
+	if (written < 0) {
+	    return -1;
+	}
+	left -= written;
+	buf += written;
+    }
+    return len;
+}
+
+static int window_size_seq(char* buf, size_t bufsz)
+{
+#ifdef TIOCGWINSZ
+    struct winsize ws;
+    static const char prefix[] = "\033_";
+    static const char suffix[] = "\033\\";
+    /* This Esc sequence is called "Application Program Command"
+       and seems suitable to use for our own customized stuff. */
+
+    if (ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == 0) {
+	int len = sn_printf(buf, bufsz, "%swinsize=%u,%u%s",
+			    prefix, ws.ws_col, ws.ws_row, suffix);
+	return len;
+    }
+#endif /* TIOCGWINSZ */
+    return 0;
+}
+
+/*   to_erl                     run_erl
+ *     |                           |
+ *     |---------- '\014' -------->| (session start)
+ *     |                           |
+ *     |<---- "[run_erl v1-0]" ----| (version interval)
+ *     |                           |
+ *     |--- Esc_"version=1"Esc\ -->| (common version)
+ *     |                           |
+ */
+static int version_handshake(char* buf, int len, int wfd)
+{
+    unsigned re_high=0, re_low;
+    char *end = find_str(buf,len,"]\n");
+
+    if (end && sscanf(buf,"[run_erl v%u-%u",&re_high,&re_low)==2) {
+	char wbuf[30];
+	int wlen;
+
+	if (re_low > RUN_ERL_HI_VER || re_high < RUN_ERL_LO_VER) {
+	    fprintf(stderr,"Incompatible versions: to_erl=v%u-%u run_erl=v%u-%u\n",
+		    RUN_ERL_HI_VER, RUN_ERL_LO_VER, re_high, re_low);
+	    return -1;
+	}
+	/* Choose highest common version */
+	protocol_ver = re_high < RUN_ERL_HI_VER ? re_high : RUN_ERL_HI_VER;
+
+	wlen = sn_printf(wbuf, sizeof(wbuf), "\033_version=%u\033\\",
+			 protocol_ver);
+	if (write_all(wfd, wbuf, wlen) < 0) {
+	    fprintf(stderr,"Failed to send version handshake\n");
+	    return -1;
+	}
+	end += 2;
+	len -= (end-buf);
+	memmove(buf,end,len);
+
+    }
+    else {  /* we assume old run_erl without version handshake */
+	protocol_ver = 0;
+    }
+
+    if (re_high != RUN_ERL_HI_VER) {
+	fprintf(stderr,"run_erl has different version, "
+		"using common protocol level %u\n", protocol_ver);
+    }
+
+    return len;
+}
+
+
+#ifdef DEBUG
+#define S(x)  ((x) > 0 ? 1 : 0)
+
+static void show_terminal_settings(struct termios *t)
+{
+  fprintf(stderr,"c_iflag:\n");
+  fprintf(stderr,"Signal interrupt on break:   BRKINT  %d\n", S(t->c_iflag & BRKINT));
+  fprintf(stderr,"Map CR to NL on input:       ICRNL   %d\n", S(t->c_iflag & ICRNL));
+  fprintf(stderr,"Ignore break condition:      IGNBRK  %d\n", S(t->c_iflag & IGNBRK));
+  fprintf(stderr,"Ignore CR:                   IGNCR   %d\n", S(t->c_iflag & IGNCR));
+  fprintf(stderr,"Ignore char with par. err's: IGNPAR  %d\n", S(t->c_iflag & IGNPAR));
+  fprintf(stderr,"Map NL to CR on input:       INLCR   %d\n", S(t->c_iflag & INLCR));
+  fprintf(stderr,"Enable input parity check:   INPCK   %d\n", S(t->c_iflag & INPCK));
+  fprintf(stderr,"Strip character              ISTRIP  %d\n", S(t->c_iflag & ISTRIP));
+  fprintf(stderr,"Enable start/stop input ctrl IXOFF   %d\n", S(t->c_iflag & IXOFF));
+  fprintf(stderr,"ditto output ctrl            IXON    %d\n", S(t->c_iflag & IXON));
+  fprintf(stderr,"Mark parity errors           PARMRK  %d\n", S(t->c_iflag & PARMRK));
+  fprintf(stderr,"\n");
+  fprintf(stderr,"c_oflag:\n");
+  fprintf(stderr,"Perform output processing    OPOST   %d\n", S(t->c_oflag & OPOST));
+  fprintf(stderr,"\n");
+  fprintf(stderr,"c_cflag:\n");
+  fprintf(stderr,"Ignore modem status lines    CLOCAL  %d\n", S(t->c_cflag & CLOCAL));
+  fprintf(stderr,"\n");
+  fprintf(stderr,"c_local:\n");
+  fprintf(stderr,"Enable echo                  ECHO    %d\n", S(t->c_lflag & ECHO));
+  fprintf(stderr,"\n");
+  fprintf(stderr,"c_cc:\n");
+  fprintf(stderr,"c_cc[VEOF]                           %d\n", t->c_cc[VEOF]);
+}
+#endif
diff --git a/erts/etc/common/to_erl_common.h b/erts/etc/common/to_erl_common.h
new file mode 100644
index 0000000000..9967db94b8
--- /dev/null
+++ b/erts/etc/common/to_erl_common.h
@@ -0,0 +1,28 @@
+/*
+ * %CopyrightBegin%
+ *
+ * Copyright Ericsson AB 2013. All Rights Reserved.
+ *
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * %CopyrightEnd%
+ */
+#ifndef ERL_TO_ERL_H
+#define ERL_TO_ERL_H
+
+#define TO_ERL_USAGE "to_erl [-h|-F] %s\n"			\
+  "\t-h\tThis help text.\n"						\
+  "\t-f\tForce connection even though pipe is locked by other to_erl process."
+
+int to_erl(int argc, char **argv);
+
+#endif