--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libiberty/pex-common.h	Fri Jul 17 14:47:48 2009 +0900
@@ -0,0 +1,153 @@
+/* Utilities to execute a program in a subprocess (possibly linked by pipes
+   with other subprocesses), and wait for it.  Shared logic.
+   Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004
+   Free Software Foundation, Inc.
+
+This file is part of the libiberty library.
+Libiberty is free software; you can redistribute it and/or
+modify it under the terms of the GNU Library General Public
+License as published by the Free Software Foundation; either
+version 2 of the License, or (at your option) any later version.
+
+Libiberty 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
+Library General Public License for more details.
+
+You should have received a copy of the GNU Library General Public
+License along with libiberty; see the file COPYING.LIB.  If not,
+write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
+Boston, MA 02110-1301, USA.  */
+
+#ifndef PEX_COMMON_H
+#define PEX_COMMON_H
+
+#include "config.h"
+#include "libiberty.h"
+#include <stdio.h>
+
+/* pid_t is may defined by config.h or sys/types.h needs to be
+   included.  */
+#if !defined(pid_t) && defined(HAVE_SYS_TYPES_H)
+#include <sys/types.h>
+#endif
+
+#define install_error_msg "installation problem, cannot exec `%s'"
+
+/* stdin file number.  */
+#define STDIN_FILE_NO 0
+
+/* stdout file number.  */
+#define STDOUT_FILE_NO 1
+
+/* stderr file number.  */
+#define STDERR_FILE_NO 2
+
+/* value of `pipe': port index for reading.  */
+#define READ_PORT 0
+
+/* value of `pipe': port index for writing.  */
+#define WRITE_PORT 1
+
+/* The structure used by pex_init and friends.  */
+
+struct pex_obj
+{
+  /* Flags.  */
+  int flags;
+  /* Name of calling program, for error messages.  */
+  const char *pname;
+  /* Base name to use for temporary files.  */
+  const char *tempbase;
+  /* Pipe to use as stdin for next process.  */
+  int next_input;
+  /* File name to use as stdin for next process.  */
+  char *next_input_name;
+  /* Whether next_input_name was allocated using malloc.  */
+  int next_input_name_allocated;
+  /* If not -1, stderr pipe from the last process.  */
+  int stderr_pipe;
+  /* Number of child processes.  */
+  int count;
+  /* PIDs of child processes; array allocated using malloc.  */
+  long *children;
+  /* Exit statuses of child processes; array allocated using malloc.  */
+  int *status;
+  /* Time used by child processes; array allocated using malloc.  */
+  struct pex_time *time;
+  /* Number of children we have already waited for.  */
+  int number_waited;
+  /* FILE created by pex_input_file.  */
+  FILE *input_file;
+  /* FILE created by pex_read_output.  */
+  FILE *read_output;
+  /* FILE created by pex_read_err.  */
+  FILE *read_err;
+  /* Number of temporary files to remove.  */
+  int remove_count;
+  /* List of temporary files to remove; array allocated using malloc
+     of strings allocated using malloc.  */
+  char **remove;
+  /* Pointers to system dependent functions.  */
+  const struct pex_funcs *funcs;
+  /* For use by system dependent code.  */
+  void *sysdep;
+};
+
+/* Functions passed to pex_run_common.  */
+
+struct pex_funcs
+{
+  /* Open file NAME for reading.  If BINARY is non-zero, open in
+     binary mode.  Return >= 0 on success, -1 on error.  */
+  int (*open_read) (struct pex_obj *, const char */* name */, int /* binary */);
+  /* Open file NAME for writing.  If BINARY is non-zero, open in
+     binary mode.  Return >= 0 on success, -1 on error.  */
+  int (*open_write) (struct pex_obj *, const char */* name */,
+                     int /* binary */);
+  /* Execute a child process.  FLAGS, EXECUTABLE, ARGV, ERR are from
+     pex_run.  IN, OUT, ERRDES, TOCLOSE are all descriptors, from
+     open_read, open_write, or pipe, or they are one of STDIN_FILE_NO,
+     STDOUT_FILE_NO or STDERR_FILE_NO; if IN, OUT, and ERRDES are not
+     STD*_FILE_NO, they should be closed.  If the descriptor TOCLOSE
+     is not -1, and the system supports pipes, TOCLOSE should be
+     closed in the child process.  The function should handle the
+     PEX_STDERR_TO_STDOUT flag.  Return >= 0 on success, or -1 on
+     error and set *ERRMSG and *ERR.  */
+  pid_t (*exec_child) (struct pex_obj *, int /* flags */,
+                      const char */* executable */, char * const * /* argv */,
+                      char * const * /* env */,
+                      int /* in */, int /* out */, int /* errdes */,
+		      int /* toclose */, const char **/* errmsg */,
+		      int */* err */);
+  /* Close a descriptor.  Return 0 on success, -1 on error.  */
+  int (*close) (struct pex_obj *, int);
+  /* Wait for a child to complete, returning exit status in *STATUS
+     and time in *TIME (if it is not null).  CHILD is from fork.  DONE
+     is 1 if this is called via pex_free.  ERRMSG and ERR are as in
+     fork.  Return 0 on success, -1 on error.  */
+  int (*wait) (struct pex_obj *, pid_t /* child */, int * /* status */,
+               struct pex_time * /* time */, int /* done */,
+               const char ** /* errmsg */, int * /* err */);
+  /* Create a pipe (only called if PEX_USE_PIPES is set) storing two
+     descriptors in P[0] and P[1].  If BINARY is non-zero, open in
+     binary mode.  Return 0 on success, -1 on error.  */
+  int (*pipe) (struct pex_obj *, int * /* p */, int /* binary */);
+  /* Get a FILE pointer to read from a file descriptor (only called if
+     PEX_USE_PIPES is set).  If BINARY is non-zero, open in binary
+     mode.  Return pointer on success, NULL on error.  */
+  FILE * (*fdopenr) (struct pex_obj *, int /* fd */, int /* binary */);
+  /* Get a FILE pointer to write to the file descriptor FD (only
+     called if PEX_USE_PIPES is set).  If BINARY is non-zero, open in
+     binary mode.  Arrange for FD not to be inherited by the child
+     processes.  Return pointer on success, NULL on error.  */
+  FILE * (*fdopenw) (struct pex_obj *, int /* fd */, int /* binary */);
+  /* Free any system dependent data associated with OBJ.  May be
+     NULL if there is nothing to do.  */
+  void (*cleanup) (struct pex_obj *);
+};
+
+extern struct pex_obj *pex_init_common (int, const char *, const char *,
+					const struct pex_funcs *);
+
+#endif