[thirdparty/gcc.git] / libiberty / pex-win32.c

/* Utilities to execute a program in a subprocess (possibly linked by pipes
   with other subprocesses), and wait for it.  Generic Win32 specialization.
   Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005
   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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.  */

#include "pex-common.h"

#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif

#include <process.h>
#include <io.h>
#include <fcntl.h>
#include <signal.h>

/* mingw32 headers may not define the following.  */

#ifndef _P_WAIT
#  define _P_WAIT	0
#  define _P_NOWAIT	1
#  define _P_OVERLAY	2
#  define _P_NOWAITO	3
#  define _P_DETACH	4

#  define WAIT_CHILD		0
#  define WAIT_GRANDCHILD	1
#endif

/* This is a kludge to get around the Microsoft C spawn functions' propensity
   to remove the outermost set of double quotes from all arguments.  */

static const char * const *
fix_argv (char **argvec)
{
  int i;
  char * command0 = argvec[0];

  /* Ensure that the executable pathname uses Win32 backslashes. This
     is not necessary on NT, but on W9x, forward slashes causes failure
     of spawn* and exec* functions (and probably any function that
     calls CreateProcess) *iff* the executable pathname (argvec[0]) is
     a quoted string.  And quoting is necessary in case a pathname
     contains  embedded white space. You can't win.  */
  for (; *command0 != '\0'; command0++)
    if (*command0 == '/')
      *command0 = '\\';
 
  for (i = 1; argvec[i] != 0; i++)
    {
      int len, j;
      char *temp, *newtemp;

      temp = argvec[i];
      len = strlen (temp);
      for (j = 0; j < len; j++)
        {
          if (temp[j] == '"')
            {
              newtemp = xmalloc (len + 2);
              strncpy (newtemp, temp, j);
              newtemp [j] = '\\';
              strncpy (&newtemp [j+1], &temp [j], len-j);
              newtemp [len+1] = 0;
              temp = newtemp;
              len++;
              j++;
            }
        }

        argvec[i] = temp;
      }

  for (i = 0; argvec[i] != 0; i++)
    {
      if (strpbrk (argvec[i], " \t"))
        {
	  int len, trailing_backslash;
	  char *temp;

	  len = strlen (argvec[i]);
	  trailing_backslash = 0;

	  /* There is an added complication when an arg with embedded white
	     space ends in a backslash (such as in the case of -iprefix arg
	     passed to cpp). The resulting quoted strings gets misinterpreted
	     by the command interpreter -- it thinks that the ending quote
	     is escaped by the trailing backslash and things get confused. 
	     We handle this case by escaping the trailing backslash, provided
	     it was not escaped in the first place.  */
	  if (len > 1 
	      && argvec[i][len-1] == '\\' 
	      && argvec[i][len-2] != '\\')
	    {
	      trailing_backslash = 1;
	      ++len;			/* to escape the final backslash. */
	    }

	  len += 2;			/* and for the enclosing quotes. */

	  temp = xmalloc (len + 1);
	  temp[0] = '"';
	  strcpy (temp + 1, argvec[i]);
	  if (trailing_backslash)
	    temp[len-2] = '\\';
	  temp[len-1] = '"';
	  temp[len] = '\0';

	  argvec[i] = temp;
	}
    }

  return (const char * const *) argvec;
}

/* Win32 supports pipes */
int
pexecute (const char *program, char * const *argv,
          const char *this_pname ATTRIBUTE_UNUSED,
          const char *temp_base ATTRIBUTE_UNUSED,
          char **errmsg_fmt, char **errmsg_arg, int flags)
{
  int pid;
  int pdes[2];
  int org_stdin = -1;
  int org_stdout = -1;
  int input_desc, output_desc;

  /* Pipe waiting from last process, to be used as input for the next one.
     Value is STDIN_FILE_NO if no pipe is waiting
     (i.e. the next command is the first of a group).  */
  static int last_pipe_input;

  /* If this is the first process, initialize.  */
  if (flags & PEXECUTE_FIRST)
    last_pipe_input = STDIN_FILE_NO;

  input_desc = last_pipe_input;

  /* If this isn't the last process, make a pipe for its output,
     and record it as waiting to be the input to the next process.  */
  if (! (flags & PEXECUTE_LAST))
    {
      if (_pipe (pdes, 256, O_BINARY) < 0)
	{
	  *errmsg_fmt = "pipe";
	  *errmsg_arg = NULL;
	  return -1;
	}
      output_desc = pdes[WRITE_PORT];
      last_pipe_input = pdes[READ_PORT];
    }
  else
    {
      /* Last process.  */
      output_desc = STDOUT_FILE_NO;
      last_pipe_input = STDIN_FILE_NO;
    }

  if (input_desc != STDIN_FILE_NO)
    {
      org_stdin = dup (STDIN_FILE_NO);
      dup2 (input_desc, STDIN_FILE_NO);
      close (input_desc); 
    }

  if (output_desc != STDOUT_FILE_NO)
    {
      org_stdout = dup (STDOUT_FILE_NO);
      dup2 (output_desc, STDOUT_FILE_NO);
      close (output_desc);
    }

  pid = (flags & PEXECUTE_SEARCH ? _spawnvp : _spawnv)
    (_P_NOWAIT, program, fix_argv(argv));

  if (input_desc != STDIN_FILE_NO)
    {
      dup2 (org_stdin, STDIN_FILE_NO);
      close (org_stdin);
    }

  if (output_desc != STDOUT_FILE_NO)
    {
      dup2 (org_stdout, STDOUT_FILE_NO);
      close (org_stdout);
    }

  if (pid == -1)
    {
      *errmsg_fmt = install_error_msg;
      *errmsg_arg = (char*) program;
      return -1;
    }

  return pid;
}

/* MS CRTDLL doesn't return enough information in status to decide if the
   child exited due to a signal or not, rather it simply returns an
   integer with the exit code of the child; eg., if the child exited with 
   an abort() call and didn't have a handler for SIGABRT, it simply returns
   with status = 3. We fix the status code to conform to the usual WIF*
   macros. Note that WIFSIGNALED will never be true under CRTDLL. */

int
pwait (int pid, int *status, int flags ATTRIBUTE_UNUSED)
{
  int termstat;

  pid = _cwait (&termstat, pid, WAIT_CHILD);

  /* ??? Here's an opportunity to canonicalize the values in STATUS.
     Needed?  */

  /* cwait returns the child process exit code in termstat.
     A value of 3 indicates that the child caught a signal, but not
     which one.  Since only SIGABRT, SIGFPE and SIGINT do anything, we
     report SIGABRT.  */
  if (termstat == 3)
    *status = SIGABRT;
  else
    *status = (((termstat) & 0xff) << 8);

  return pid;
}
Commit	Line	Data
55d0e5e0 ZW	1	/* Utilities to execute a program in a subprocess (possibly linked by pipes
55d0e5e0 ZW	2	with other subprocesses), and wait for it. Generic Win32 specialization.
885f2199	3	Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005
55d0e5e0 ZW	4	Free Software Foundation, Inc.
	5
	6	This file is part of the libiberty library.
	7	Libiberty is free software; you can redistribute it and/or
	8	modify it under the terms of the GNU Library General Public
	9	License as published by the Free Software Foundation; either
	10	version 2 of the License, or (at your option) any later version.
	11
	12	Libiberty is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	Library General Public License for more details.
	16
	17	You should have received a copy of the GNU Library General Public
	18	License along with libiberty; see the file COPYING.LIB. If not,
	19	write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
	20	Boston, MA 02111-1307, USA. */
	21
	22	#include "pex-common.h"
	23
	24	#ifdef HAVE_STRING_H
	25	#include <string.h>
	26	#endif
	27	#ifdef HAVE_UNISTD_H
	28	#include <unistd.h>
	29	#endif
	30	#ifdef HAVE_SYS_WAIT_H
	31	#include <sys/wait.h>
	32	#endif
	33
	34	#include <process.h>
	35	#include <io.h>
	36	#include <fcntl.h>
	37	#include <signal.h>
	38
	39	/* mingw32 headers may not define the following. */
	40
	41	#ifndef _P_WAIT
	42	# define _P_WAIT 0
	43	# define _P_NOWAIT 1
	44	# define _P_OVERLAY 2
	45	# define _P_NOWAITO 3
	46	# define _P_DETACH 4
	47
	48	# define WAIT_CHILD 0
	49	# define WAIT_GRANDCHILD 1
	50	#endif
	51
	52	/* This is a kludge to get around the Microsoft C spawn functions' propensity
	53	to remove the outermost set of double quotes from all arguments. */
	54
	55	static const char * const *
885f2199	56	fix_argv (char **argvec)
55d0e5e0 ZW	57	{
55d0e5e0 ZW	58	int i;
bacb96b2	59	char * command0 = argvec[0];
55d0e5e0	60
b47785f4 DS	61	/* Ensure that the executable pathname uses Win32 backslashes. This
	62	is not necessary on NT, but on W9x, forward slashes causes failure
	63	of spawn* and exec* functions (and probably any function that
	64	calls CreateProcess) iff the executable pathname (argvec[0]) is
	65	a quoted string. And quoting is necessary in case a pathname
	66	contains embedded white space. You can't win. */
bacb96b2 DS	67	for (; *command0 != '\0'; command0++)
	68	if (*command0 == '/')
	69	*command0 = '\\';
	70
55d0e5e0 ZW	71	for (i = 1; argvec[i] != 0; i++)
	72	{
	73	int len, j;
	74	char temp, newtemp;
	75
	76	temp = argvec[i];
	77	len = strlen (temp);
	78	for (j = 0; j < len; j++)
	79	{
	80	if (temp[j] == '"')
	81	{
	82	newtemp = xmalloc (len + 2);
	83	strncpy (newtemp, temp, j);
	84	newtemp [j] = '\\';
	85	strncpy (&newtemp [j+1], &temp [j], len-j);
	86	newtemp [len+1] = 0;
	87	temp = newtemp;
	88	len++;
	89	j++;
	90	}
	91	}
	92
	93	argvec[i] = temp;
	94	}
	95
	96	for (i = 0; argvec[i] != 0; i++)
	97	{
	98	if (strpbrk (argvec[i], " \t"))
	99	{
	100	int len, trailing_backslash;
	101	char *temp;
	102
	103	len = strlen (argvec[i]);
	104	trailing_backslash = 0;
	105
	106	/* There is an added complication when an arg with embedded white
	107	space ends in a backslash (such as in the case of -iprefix arg
	108	passed to cpp). The resulting quoted strings gets misinterpreted
	109	by the command interpreter -- it thinks that the ending quote
	110	is escaped by the trailing backslash and things get confused.
	111	We handle this case by escaping the trailing backslash, provided
	112	it was not escaped in the first place. */
	113	if (len > 1
	114	&& argvec[i][len-1] == '\\'
	115	&& argvec[i][len-2] != '\\')
	116	{
	117	trailing_backslash = 1;
	118	++len; /* to escape the final backslash. */
	119	}
	120
	121	len += 2; /* and for the enclosing quotes. */
	122
	123	temp = xmalloc (len + 1);
	124	temp[0] = '"';
	125	strcpy (temp + 1, argvec[i]);
	126	if (trailing_backslash)
	127	temp[len-2] = '\\';
	128	temp[len-1] = '"';
	129	temp[len] = '\0';
	130
	131	argvec[i] = temp;
	132	}
	133	}
	134
135	return (const char * const *) argvec;
136	}
137
138	/* Win32 supports pipes */
139	int
885f2199 GDR	140	pexecute (const char program, char const *argv,
	141	const char *this_pname ATTRIBUTE_UNUSED,
	142	const char *temp_base ATTRIBUTE_UNUSED,
	143	char errmsg_fmt, char errmsg_arg, int flags)
55d0e5e0 ZW	144	{
55d0e5e0 ZW	145	int pid;
7b96f3e4 DS	146	int pdes[2];
	147	int org_stdin = -1;
	148	int org_stdout = -1;
55d0e5e0	149	int input_desc, output_desc;
55d0e5e0 ZW	150
	151	/* Pipe waiting from last process, to be used as input for the next one.
	152	Value is STDIN_FILE_NO if no pipe is waiting
	153	(i.e. the next command is the first of a group). */
	154	static int last_pipe_input;
	155
	156	/* If this is the first process, initialize. */
	157	if (flags & PEXECUTE_FIRST)
	158	last_pipe_input = STDIN_FILE_NO;
	159
	160	input_desc = last_pipe_input;
	161
	162	/* If this isn't the last process, make a pipe for its output,
	163	and record it as waiting to be the input to the next process. */
	164	if (! (flags & PEXECUTE_LAST))
	165	{
	166	if (_pipe (pdes, 256, O_BINARY) < 0)
	167	{
	168	*errmsg_fmt = "pipe";
	169	*errmsg_arg = NULL;
	170	return -1;
	171	}
	172	output_desc = pdes[WRITE_PORT];
	173	last_pipe_input = pdes[READ_PORT];
	174	}
	175	else
	176	{
	177	/* Last process. */
	178	output_desc = STDOUT_FILE_NO;
	179	last_pipe_input = STDIN_FILE_NO;
	180	}
	181
	182	if (input_desc != STDIN_FILE_NO)
	183	{
	184	org_stdin = dup (STDIN_FILE_NO);
	185	dup2 (input_desc, STDIN_FILE_NO);
	186	close (input_desc);
	187	}
	188
	189	if (output_desc != STDOUT_FILE_NO)
	190	{
	191	org_stdout = dup (STDOUT_FILE_NO);
	192	dup2 (output_desc, STDOUT_FILE_NO);
	193	close (output_desc);
	194	}
	195
	196	pid = (flags & PEXECUTE_SEARCH ? _spawnvp : _spawnv)
	197	(_P_NOWAIT, program, fix_argv(argv));
	198
	199	if (input_desc != STDIN_FILE_NO)
	200	{
	201	dup2 (org_stdin, STDIN_FILE_NO);
	202	close (org_stdin);
	203	}
	204
	205	if (output_desc != STDOUT_FILE_NO)
	206	{
	207	dup2 (org_stdout, STDOUT_FILE_NO);
	208	close (org_stdout);
	209	}
	210
	211	if (pid == -1)
	212	{
	213	*errmsg_fmt = install_error_msg;
bacb96b2	214	errmsg_arg = (char) program;
55d0e5e0 ZW	215	return -1;
	216	}
	217
	218	return pid;
	219	}
	220
	221	/* MS CRTDLL doesn't return enough information in status to decide if the
	222	child exited due to a signal or not, rather it simply returns an
	223	integer with the exit code of the child; eg., if the child exited with
	224	an abort() call and didn't have a handler for SIGABRT, it simply returns
	225	with status = 3. We fix the status code to conform to the usual WIF*
	226	macros. Note that WIFSIGNALED will never be true under CRTDLL. */
	227
	228	int
885f2199	229	pwait (int pid, int *status, int flags ATTRIBUTE_UNUSED)
55d0e5e0 ZW	230	{
	231	int termstat;
	232
	233	pid = _cwait (&termstat, pid, WAIT_CHILD);
	234
	235	/* ??? Here's an opportunity to canonicalize the values in STATUS.
	236	Needed? */
	237
	238	/* cwait returns the child process exit code in termstat.
	239	A value of 3 indicates that the child caught a signal, but not
	240	which one. Since only SIGABRT, SIGFPE and SIGINT do anything, we
	241	report SIGABRT. */
	242	if (termstat == 3)
	243	*status = SIGABRT;
	244	else
	245	*status = (((termstat) & 0xff) << 8);
	246
	247	return pid;
	248	}