720 lines
17 KiB
C
720 lines
17 KiB
C
/* Utilities to execute a program in a subprocess (possibly linked by pipes
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with other subprocesses), and wait for it. Generic Win32 specialization.
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Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005
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Free Software Foundation, Inc.
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This file is part of the libiberty library.
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Libiberty is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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Libiberty is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with libiberty; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor,
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Boston, MA 02110-1301, USA. */
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#include "pex-common.h"
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#include <windows.h>
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_SYS_WAIT_H
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#include <sys/wait.h>
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#endif
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#include <process.h>
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#include <io.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <sys/stat.h>
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/* mingw32 headers may not define the following. */
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#ifndef _P_WAIT
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# define _P_WAIT 0
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# define _P_NOWAIT 1
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# define _P_OVERLAY 2
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# define _P_NOWAITO 3
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# define _P_DETACH 4
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# define WAIT_CHILD 0
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# define WAIT_GRANDCHILD 1
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#endif
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#define MINGW_NAME "Minimalist GNU for Windows"
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#define MINGW_NAME_LEN (sizeof(MINGW_NAME) - 1)
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/* Ensure that the executable pathname uses Win32 backslashes. This
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is not necessary on NT, but on W9x, forward slashes causes
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failure of spawn* and exec* functions (and probably any function
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that calls CreateProcess) *iff* the executable pathname (argv[0])
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is a quoted string. And quoting is necessary in case a pathname
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contains embedded white space. You can't win. */
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static void
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backslashify (char *s)
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{
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while ((s = strchr (s, '/')) != NULL)
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*s = '\\';
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return;
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}
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/* This is a kludge to get around the Microsoft C spawn functions' propensity
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to remove the outermost set of double quotes from all arguments. */
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static const char * const *
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fix_argv (char * const *argvec)
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{
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char **argv;
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int i;
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char *command0;
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/* See whether we need to change anything. */
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for (command0 = argvec[0]; *command0 != '\0'; command0++)
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if (*command0 == '/')
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break;
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if (*command0 == '\0')
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{
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for (i = 1; argvec[i] != NULL; i++)
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if (strpbrk (argvec[i], "\" \t") != NULL)
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break;
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if (argvec[i] == NULL)
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return (const char * const *) argvec;
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}
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for (i = 0; argvec[i] != NULL; i++)
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;
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argv = XNEWVEC (char *, i + 2);
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argv++; /* Leave space at the beginning of argv
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for potential #! handling */
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for (i = 0; argvec[i] != NULL; i++)
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argv[i] = xstrdup (argvec[i]);
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argv[i] = NULL;
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backslashify (argv[0]);
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for (i = 1; argv[i] != 0; i++)
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{
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int len, j;
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char *temp, *newtemp;
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temp = argv[i];
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len = strlen (temp);
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for (j = 0; j < len; j++)
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{
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if (temp[j] == '"')
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{
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newtemp = XNEWVEC (char, len + 2);
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strncpy (newtemp, temp, j);
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newtemp [j] = '\\';
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strncpy (&newtemp [j+1], &temp [j], len-j);
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newtemp [len+1] = 0;
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temp = newtemp;
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len++;
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j++;
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}
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}
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if (argv[i] != temp)
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{
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free (argv[i]);
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argv[i] = temp;
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}
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}
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for (i = 0; argv[i] != 0; i++)
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{
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if (strpbrk (argv[i], " \t"))
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{
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int len, trailing_backslash;
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char *temp;
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len = strlen (argv[i]);
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trailing_backslash = 0;
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/* There is an added complication when an arg with embedded white
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space ends in a backslash (such as in the case of -iprefix arg
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passed to cpp). The resulting quoted strings gets misinterpreted
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by the command interpreter -- it thinks that the ending quote
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is escaped by the trailing backslash and things get confused.
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We handle this case by escaping the trailing backslash, provided
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it was not escaped in the first place. */
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if (len > 1
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&& argv[i][len-1] == '\\'
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&& argv[i][len-2] != '\\')
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{
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trailing_backslash = 1;
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++len; /* to escape the final backslash. */
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}
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len += 2; /* and for the enclosing quotes. */
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temp = XNEWVEC (char, len + 1);
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temp[0] = '"';
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strcpy (temp + 1, argv[i]);
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if (trailing_backslash)
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temp[len - 2] = '\\';
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temp[len - 1] = '"';
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temp[len] = '\0';
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free (argv[i]);
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argv[i] = temp;
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}
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}
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return (const char * const *) argv;
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}
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static int pex_win32_open_read (struct pex_obj *, const char *, int);
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static int pex_win32_open_write (struct pex_obj *, const char *, int);
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static long pex_win32_exec_child (struct pex_obj *, int, const char *,
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char * const *, int, int, int, int,
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const char **, int *);
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static int pex_win32_close (struct pex_obj *, int);
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static int pex_win32_wait (struct pex_obj *, long, int *,
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struct pex_time *, int, const char **, int *);
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static int pex_win32_pipe (struct pex_obj *, int *, int);
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static FILE *pex_win32_fdopenr (struct pex_obj *, int, int);
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/* The list of functions we pass to the common routines. */
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const struct pex_funcs funcs =
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{
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pex_win32_open_read,
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pex_win32_open_write,
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pex_win32_exec_child,
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pex_win32_close,
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pex_win32_wait,
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pex_win32_pipe,
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pex_win32_fdopenr,
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NULL /* cleanup */
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};
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/* Return a newly initialized pex_obj structure. */
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struct pex_obj *
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pex_init (int flags, const char *pname, const char *tempbase)
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{
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return pex_init_common (flags, pname, tempbase, &funcs);
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}
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/* Open a file for reading. */
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static int
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pex_win32_open_read (struct pex_obj *obj ATTRIBUTE_UNUSED, const char *name,
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int binary)
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{
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return _open (name, _O_RDONLY | (binary ? _O_BINARY : _O_TEXT));
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}
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/* Open a file for writing. */
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static int
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pex_win32_open_write (struct pex_obj *obj ATTRIBUTE_UNUSED, const char *name,
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int binary)
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{
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/* Note that we can't use O_EXCL here because gcc may have already
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created the temporary file via make_temp_file. */
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return _open (name,
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(_O_WRONLY | _O_CREAT | _O_TRUNC
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| (binary ? _O_BINARY : _O_TEXT)),
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_S_IREAD | _S_IWRITE);
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}
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/* Close a file. */
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static int
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pex_win32_close (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd)
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{
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return _close (fd);
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}
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#ifdef USE_MINGW_MSYS
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static const char *mingw_keys[] = {"SOFTWARE", "Microsoft", "Windows", "CurrentVersion", "Uninstall", NULL};
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/* Tack the executable on the end of a (possibly slash terminated) buffer
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and convert everything to \. */
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static const char *
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tack_on_executable (char *buf, const char *executable)
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{
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char *p = strchr (buf, '\0');
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if (p > buf && (p[-1] == '\\' || p[-1] == '/'))
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p[-1] = '\0';
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backslashify (strcat (buf, executable));
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return buf;
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}
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/* Walk down a registry hierarchy until the end. Return the key. */
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static HKEY
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openkey (HKEY hStart, const char *keys[])
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{
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HKEY hKey, hTmp;
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for (hKey = hStart; *keys; keys++)
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{
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LONG res;
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hTmp = hKey;
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res = RegOpenKey (hTmp, *keys, &hKey);
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if (hTmp != HKEY_LOCAL_MACHINE)
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RegCloseKey (hTmp);
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if (res != ERROR_SUCCESS)
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return NULL;
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}
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return hKey;
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}
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/* Return the "mingw root" as derived from the mingw uninstall information. */
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static const char *
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mingw_rootify (const char *executable)
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{
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HKEY hKey, hTmp;
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DWORD maxlen;
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char *namebuf, *foundbuf;
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DWORD i;
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LONG res;
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/* Open the uninstall "directory". */
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hKey = openkey (HKEY_LOCAL_MACHINE, mingw_keys);
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/* Not found. */
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if (!hKey)
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return executable;
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/* Need to enumerate all of the keys here looking for one the most recent
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one for MinGW. */
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if (RegQueryInfoKey (hKey, NULL, NULL, NULL, NULL, &maxlen, NULL, NULL,
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NULL, NULL, NULL, NULL) != ERROR_SUCCESS)
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{
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RegCloseKey (hKey);
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return executable;
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}
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namebuf = XNEWVEC (char, ++maxlen);
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foundbuf = XNEWVEC (char, maxlen);
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foundbuf[0] = '\0';
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if (!namebuf || !foundbuf)
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{
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RegCloseKey (hKey);
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if (namebuf)
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free (namebuf);
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if (foundbuf)
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free (foundbuf);
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return executable;
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}
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/* Look through all of the keys for one that begins with Minimal GNU...
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Try to get the latest version by doing a string compare although that
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string never really works with version number sorting. */
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for (i = 0; RegEnumKey (hKey, i, namebuf, maxlen) == ERROR_SUCCESS; i++)
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{
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int match = strcasecmp (namebuf, MINGW_NAME);
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if (match < 0)
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continue;
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if (match > 0 && strncasecmp (namebuf, MINGW_NAME, MINGW_NAME_LEN) > 0)
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continue;
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if (strcasecmp (namebuf, foundbuf) > 0)
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strcpy (foundbuf, namebuf);
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}
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free (namebuf);
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/* If foundbuf is empty, we didn't find anything. Punt. */
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if (!foundbuf[0])
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{
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free (foundbuf);
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RegCloseKey (hKey);
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return executable;
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}
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/* Open the key that we wanted */
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res = RegOpenKey (hKey, foundbuf, &hTmp);
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RegCloseKey (hKey);
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free (foundbuf);
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/* Don't know why this would fail, but you gotta check */
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if (res != ERROR_SUCCESS)
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return executable;
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maxlen = 0;
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/* Get the length of the value pointed to by InstallLocation */
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if (RegQueryValueEx (hTmp, "InstallLocation", 0, NULL, NULL,
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&maxlen) != ERROR_SUCCESS || maxlen == 0)
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{
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RegCloseKey (hTmp);
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return executable;
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}
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/* Allocate space for the install location */
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foundbuf = XNEWVEC (char, maxlen + strlen (executable));
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if (!foundbuf)
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{
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free (foundbuf);
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RegCloseKey (hTmp);
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}
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/* Read the install location into the buffer */
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res = RegQueryValueEx (hTmp, "InstallLocation", 0, NULL, (LPBYTE) foundbuf,
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&maxlen);
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RegCloseKey (hTmp);
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if (res != ERROR_SUCCESS)
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{
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free (foundbuf);
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return executable;
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}
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/* Concatenate the install location and the executable, turn all slashes
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to backslashes, and return that. */
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return tack_on_executable (foundbuf, executable);
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}
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/* Read the install location of msys from it's installation file and
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rootify the executable based on that. */
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static const char *
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msys_rootify (const char *executable)
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{
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size_t bufsize = 64;
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size_t execlen = strlen (executable) + 1;
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char *buf;
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DWORD res = 0;
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for (;;)
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{
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buf = XNEWVEC (char, bufsize + execlen);
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if (!buf)
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break;
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res = GetPrivateProfileString ("InstallSettings", "InstallPath", NULL,
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buf, bufsize, "msys.ini");
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if (!res)
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break;
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if (strlen (buf) < bufsize)
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break;
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res = 0;
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free (buf);
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bufsize *= 2;
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if (bufsize > 65536)
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{
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buf = NULL;
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break;
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}
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}
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if (res)
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return tack_on_executable (buf, executable);
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/* failed */
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if (buf)
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free (buf);
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return executable;
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}
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#endif
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static long
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spawn_script (const char *executable, const char * const * argv)
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{
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int pid = -1;
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int save_errno = errno;
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int fd = _open (executable, _O_RDONLY);
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if (fd >= 0)
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{
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char buf[MAX_PATH + 5];
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int len = _read (fd, buf, sizeof (buf) - 1);
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_close (fd);
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if (len > 3)
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{
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char *eol;
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buf[len] = '\0';
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eol = strchr (buf, '\n');
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if (eol && strncmp (buf, "#!", 2) == 0)
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{
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char *executable1;
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const char ** avhere = (const char **) --argv;
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do
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*eol = '\0';
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while (*--eol == '\r' || *eol == ' ' || *eol == '\t');
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for (executable1 = buf + 2; *executable1 == ' ' || *executable1 == '\t'; executable1++)
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continue;
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backslashify (executable1);
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*avhere = executable1;
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#ifndef USE_MINGW_MSYS
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executable = strrchr (executable1, '\\') + 1;
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if (!executable)
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executable = executable1;
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pid = _spawnvp (_P_NOWAIT, executable, argv);
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#else
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if (strchr (executable1, '\\') == NULL)
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pid = _spawnvp (_P_NOWAIT, executable1, argv);
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else if (executable1[0] != '\\')
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pid = _spawnv (_P_NOWAIT, executable1, argv);
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else
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{
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const char *newex = mingw_rootify (executable1);
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*avhere = newex;
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pid = _spawnv (_P_NOWAIT, newex, argv);
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if (executable1 != newex)
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free ((char *) newex);
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if (pid < 0)
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{
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newex = msys_rootify (executable1);
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if (newex != executable1)
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{
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*avhere = newex;
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pid = _spawnv (_P_NOWAIT, newex, argv);
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free ((char *) newex);
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}
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}
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}
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#endif
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}
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}
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}
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if (pid < 0)
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errno = save_errno;
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return pid;
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}
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/* Execute a child. */
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static long
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pex_win32_exec_child (struct pex_obj *obj ATTRIBUTE_UNUSED, int flags,
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const char *executable, char * const * argv,
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int in, int out, int errdes,
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int toclose ATTRIBUTE_UNUSED,
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const char **errmsg,
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int *err)
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{
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int org_in, org_out, org_errdes;
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long pid;
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const char * const * newargv;
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org_in = -1;
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org_out = -1;
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org_errdes = -1;
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if (in != STDIN_FILE_NO)
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{
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org_in = _dup (STDIN_FILE_NO);
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if (org_in < 0)
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{
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*err = errno;
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*errmsg = "_dup";
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return -1;
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}
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if (_dup2 (in, STDIN_FILE_NO) < 0)
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{
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*err = errno;
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*errmsg = "_dup2";
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return -1;
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}
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if (_close (in) < 0)
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{
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*err = errno;
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*errmsg = "_close";
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return -1;
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}
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}
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if (out != STDOUT_FILE_NO)
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{
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org_out = _dup (STDOUT_FILE_NO);
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if (org_out < 0)
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{
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*err = errno;
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*errmsg = "_dup";
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return -1;
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}
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if (_dup2 (out, STDOUT_FILE_NO) < 0)
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{
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*err = errno;
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*errmsg = "_dup2";
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return -1;
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}
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|
if (_close (out) < 0)
|
|
{
|
|
*err = errno;
|
|
*errmsg = "_close";
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
if (errdes != STDERR_FILE_NO
|
|
|| (flags & PEX_STDERR_TO_STDOUT) != 0)
|
|
{
|
|
org_errdes = _dup (STDERR_FILE_NO);
|
|
if (org_errdes < 0)
|
|
{
|
|
*err = errno;
|
|
*errmsg = "_dup";
|
|
return -1;
|
|
}
|
|
if (_dup2 ((flags & PEX_STDERR_TO_STDOUT) != 0 ? STDOUT_FILE_NO : errdes,
|
|
STDERR_FILE_NO) < 0)
|
|
{
|
|
*err = errno;
|
|
*errmsg = "_dup2";
|
|
return -1;
|
|
}
|
|
if (errdes != STDERR_FILE_NO)
|
|
{
|
|
if (_close (errdes) < 0)
|
|
{
|
|
*err = errno;
|
|
*errmsg = "_close";
|
|
return -1;
|
|
}
|
|
}
|
|
}
|
|
|
|
newargv = fix_argv (argv);
|
|
pid = (((flags & PEX_SEARCH) != 0 ? _spawnvp : _spawnv)
|
|
(_P_NOWAIT, executable, newargv));
|
|
|
|
if (pid == -1)
|
|
pid = spawn_script (executable, newargv);
|
|
|
|
if (pid == -1)
|
|
{
|
|
*err = errno;
|
|
*errmsg = ((flags & PEX_SEARCH) != 0) ? "_spawnvp" : "_spawnv";
|
|
}
|
|
|
|
if (in != STDIN_FILE_NO)
|
|
{
|
|
if (_dup2 (org_in, STDIN_FILE_NO) < 0)
|
|
{
|
|
*err = errno;
|
|
*errmsg = "_dup2";
|
|
return -1;
|
|
}
|
|
if (_close (org_in) < 0)
|
|
{
|
|
*err = errno;
|
|
*errmsg = "_close";
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
if (out != STDOUT_FILE_NO)
|
|
{
|
|
if (_dup2 (org_out, STDOUT_FILE_NO) < 0)
|
|
{
|
|
*err = errno;
|
|
*errmsg = "_dup2";
|
|
return -1;
|
|
}
|
|
if (_close (org_out) < 0)
|
|
{
|
|
*err = errno;
|
|
*errmsg = "_close";
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
if (errdes != STDERR_FILE_NO
|
|
|| (flags & PEX_STDERR_TO_STDOUT) != 0)
|
|
{
|
|
if (_dup2 (org_errdes, STDERR_FILE_NO) < 0)
|
|
{
|
|
*err = errno;
|
|
*errmsg = "_dup2";
|
|
return -1;
|
|
}
|
|
if (_close (org_errdes) < 0)
|
|
{
|
|
*err = errno;
|
|
*errmsg = "_close";
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
return pid;
|
|
}
|
|
|
|
/* Wait for a child process to complete. 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. */
|
|
|
|
static int
|
|
pex_win32_wait (struct pex_obj *obj ATTRIBUTE_UNUSED, long pid,
|
|
int *status, struct pex_time *time, int done ATTRIBUTE_UNUSED,
|
|
const char **errmsg, int *err)
|
|
{
|
|
int termstat;
|
|
|
|
if (time != NULL)
|
|
memset (time, 0, sizeof *time);
|
|
|
|
/* FIXME: If done is non-zero, we should probably try to kill the
|
|
process. */
|
|
|
|
if (_cwait (&termstat, pid, WAIT_CHILD) < 0)
|
|
{
|
|
*err = errno;
|
|
*errmsg = "_cwait";
|
|
return -1;
|
|
}
|
|
|
|
/* 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 0;
|
|
}
|
|
|
|
/* Create a pipe. */
|
|
|
|
static int
|
|
pex_win32_pipe (struct pex_obj *obj ATTRIBUTE_UNUSED, int *p,
|
|
int binary)
|
|
{
|
|
return _pipe (p, 256, binary ? _O_BINARY : _O_TEXT);
|
|
}
|
|
|
|
/* Get a FILE pointer to read from a file descriptor. */
|
|
|
|
static FILE *
|
|
pex_win32_fdopenr (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd,
|
|
int binary)
|
|
{
|
|
return fdopen (fd, binary ? "rb" : "r");
|
|
}
|
|
|
|
#ifdef MAIN
|
|
#include <stdio.h>
|
|
|
|
int
|
|
main (int argc ATTRIBUTE_UNUSED, char **argv)
|
|
{
|
|
char const *errmsg;
|
|
int err;
|
|
argv++;
|
|
printf ("%ld\n", pex_win32_exec_child (NULL, PEX_SEARCH, argv[0], argv, 0, 1, 2, &errmsg, &err));
|
|
exit (0);
|
|
}
|
|
#endif
|