--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/fixincludes/procopen.c	Fri Jul 17 14:47:48 2009 +0900
@@ -0,0 +1,218 @@
+
+/*
+ *  server.c  Set up and handle communications with a server process.
+ *
+ *  Server Handling copyright 1992-1999, 2004 The Free Software Foundation
+ *
+ *  Server Handling is free software.
+ *  You may redistribute it and/or modify it under the terms of the
+ *  GNU General Public License, as published by the Free Software
+ *  Foundation; either version 2, or (at your option) any later version.
+ *
+ *  Server Handling is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with Server Handling.  See the file "COPYING".  If not,
+ *  write to:  The Free Software Foundation, Inc.,
+ *             51 Franklin Street, Fifth Floor,
+ *             Boston,  MA  02110-1301, USA.
+ *
+ * As a special exception, The Free Software Foundation gives
+ * permission for additional uses of the text contained in his release
+ * of ServerHandler.
+ *
+ * The exception is that, if you link the ServerHandler library with other
+ * files to produce an executable, this does not by itself cause the
+ * resulting executable to be covered by the GNU General Public License.
+ * Your use of that executable is in no way restricted on account of
+ * linking the ServerHandler library code into it.
+ *
+ * This exception does not however invalidate any other reasons why
+ * the executable file might be covered by the GNU General Public License.
+ *
+ * This exception applies only to the code released by The Free
+ * Software Foundation under the name ServerHandler.  If you copy code
+ * from other sources under the General Public License into a copy of
+ * ServerHandler, as the General Public License permits, the exception
+ * does not apply to the code that you add in this way.  To avoid
+ * misleading anyone as to the status of such modified files, you must
+ * delete this exception notice from them.
+ *
+ * If you write modifications of your own for ServerHandler, it is your
+ * choice whether to permit this exception to apply to your modifications.
+ * If you do not wish that, delete this exception notice.
+ */
+
+#include "fixlib.h"
+#include "server.h"
+
+STATIC const char* def_args[] =
+{ (char *) NULL, (char *) NULL };
+
+/*
+ *  chain_open
+ *
+ *  Given an FD for an inferior process to use as stdin,
+ *  start that process and return a NEW FD that that process
+ *  will use for its stdout.  Requires the argument vector
+ *  for the new process and, optionally, a pointer to a place
+ *  to store the child's process id.
+ */
+int
+chain_open (int stdin_fd, tCC** pp_args, pid_t* p_child)
+{
+  t_fd_pair stdout_pair;
+  pid_t ch_id;
+  tCC *pz_cmd;
+
+  stdout_pair.read_fd = stdout_pair.write_fd = -1;
+
+  /*
+   *  Create a pipe it will be the child process' stdout,
+   *  and the parent will read from it.
+   */
+  if (pipe ((int *) &stdout_pair) < 0)
+    {
+      if (p_child != (pid_t *) NULL)
+        *p_child = NOPROCESS;
+      return -1;
+    }
+
+  /*
+   *  If we did not get an arg list, use the default
+   */
+  if (pp_args == (tCC **) NULL)
+    pp_args = def_args;
+
+  /*
+   *  If the arg list does not have a program,
+   *  assume the "SHELL" from the environment, or, failing
+   *  that, then sh.  Set argv[0] to whatever we decided on.
+   */
+  if (pz_cmd = *pp_args,
+      (pz_cmd == (char *) NULL) || (*pz_cmd == '\0'))
+    {
+
+      pz_cmd = getenv ("SHELL");
+      if (pz_cmd == (char *) NULL)
+        pz_cmd = "sh";
+    }
+
+#ifdef DEBUG_PRINT
+  printf ("START:  %s\n", pz_cmd);
+  {
+    int idx = 0;
+    
+    while (pp_args[++idx] != (char *) NULL)
+      printf ("  ARG %2d:  %s\n", idx, pp_args[idx]);
+  }
+#endif
+
+  /*
+   *  Call fork() and see which process we become
+   */
+  ch_id = fork ();
+  switch (ch_id)
+    {
+    case NOPROCESS:             /* parent - error in call */
+      close (stdout_pair.read_fd);
+      close (stdout_pair.write_fd);
+      if (p_child != (pid_t *) NULL)
+        *p_child = NOPROCESS;
+      return -1;
+
+    default:                    /* parent - return opposite FD's */
+      if (p_child != (pid_t *) NULL)
+        *p_child = ch_id;
+#ifdef DEBUG_PRINT
+      printf ("for pid %d:  stdin from %d, stdout to %d\n"
+              "for parent:  read from %d\n",
+              ch_id, stdin_fd, stdout_pair.write_fd, stdout_pair.read_fd);
+#endif
+      close (stdin_fd);
+      close (stdout_pair.write_fd);
+      return stdout_pair.read_fd;
+
+    case NULLPROCESS:           /* child - continue processing */
+      break;
+    }
+
+  /*
+   *  Close the pipe end handed back to the parent process
+   */
+  close (stdout_pair.read_fd);
+
+  /*
+   *  Close our current stdin and stdout
+   */
+  close (STDIN_FILENO);
+  close (STDOUT_FILENO);
+
+  /*
+   *  Make the fd passed in the stdin, and the write end of
+   *  the new pipe become the stdout.
+   */
+  dup2 (stdout_pair.write_fd, STDOUT_FILENO);
+  dup2 (stdin_fd, STDIN_FILENO);
+
+  if (*pp_args == (char *) NULL)
+    *pp_args = pz_cmd;
+
+  execvp (pz_cmd, (char**)pp_args);
+  fprintf (stderr, "Error %d:  Could not execvp( '%s', ... ):  %s\n",
+           errno, pz_cmd, xstrerror (errno));
+  exit (EXIT_PANIC);
+}
+
+
+/*
+ *  proc2_open
+ *
+ *  Given a pointer to an argument vector, start a process and
+ *  place its stdin and stdout file descriptors into an fd pair
+ *  structure.  The "write_fd" connects to the inferior process
+ *  stdin, and the "read_fd" connects to its stdout.  The calling
+ *  process should write to "write_fd" and read from "read_fd".
+ *  The return value is the process id of the created process.
+ */
+pid_t
+proc2_open (t_fd_pair* p_pair, tCC** pp_args)
+{
+  pid_t ch_id;
+
+  /*  Create a bi-directional pipe.  Writes on 0 arrive on 1 and vice
+     versa, so the parent and child processes will read and write to
+     opposite FD's.  */
+  if (pipe ((int *) p_pair) < 0)
+    return NOPROCESS;
+
+  p_pair->read_fd = chain_open (p_pair->read_fd, pp_args, &ch_id);
+  if (ch_id == NOPROCESS)
+    close (p_pair->write_fd);
+
+  return ch_id;
+}
+
+
+/*
+ *  proc2_fopen
+ *
+ *  Identical to "proc2_open()", except that the "fd"'s are
+ *  "fdopen(3)"-ed into file pointers instead.
+ */
+pid_t
+proc2_fopen (t_pf_pair* pf_pair, tCC** pp_args)
+{
+  t_fd_pair fd_pair;
+  pid_t ch_id = proc2_open (&fd_pair, pp_args);
+
+  if (ch_id == NOPROCESS)
+    return ch_id;
+
+  pf_pair->pf_read = fdopen (fd_pair.read_fd, "r");
+  pf_pair->pf_write = fdopen (fd_pair.write_fd, "w");
+  return ch_id;
+}