1 /* Utilities to execute a program in a subprocess (possibly linked by pipes
2 with other subprocesses), and wait for it. Generic Win32 specialization.
3 Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2004, 2005
4 Free Software Foundation, Inc.
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.
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.
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. */
22 #include "pex-common.h"
30 #ifdef HAVE_SYS_WAIT_H
39 /* mingw32 headers may not define the following. */
49 # define WAIT_GRANDCHILD 1
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. */
55 static const char * const *
56 fix_argv (char **argvec)
59 char * command0 = argvec[0];
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. */
67 for (; *command0 != '\0'; command0++)
71 for (i = 1; argvec[i] != 0; i++)
78 for (j = 0; j < len; j++)
82 newtemp = xmalloc (len + 2);
83 strncpy (newtemp, temp, j);
85 strncpy (&newtemp [j+1], &temp [j], len-j);
96 for (i = 0; argvec[i] != 0; i++)
98 if (strpbrk (argvec[i], " \t"))
100 int len, trailing_backslash;
103 len = strlen (argvec[i]);
104 trailing_backslash = 0;
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. */
114 && argvec[i][len-1] == '\\'
115 && argvec[i][len-2] != '\\')
117 trailing_backslash = 1;
118 ++len; /* to escape the final backslash. */
121 len += 2; /* and for the enclosing quotes. */
123 temp = xmalloc (len + 1);
125 strcpy (temp + 1, argvec[i]);
126 if (trailing_backslash)
135 return (const char * const *) argvec;
138 /* Win32 supports pipes */
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)
149 int input_desc, output_desc;
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;
156 /* If this is the first process, initialize. */
157 if (flags & PEXECUTE_FIRST)
158 last_pipe_input = STDIN_FILE_NO;
160 input_desc = last_pipe_input;
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))
166 if (_pipe (pdes, 256, O_BINARY) < 0)
168 *errmsg_fmt = "pipe";
172 output_desc = pdes[WRITE_PORT];
173 last_pipe_input = pdes[READ_PORT];
178 output_desc = STDOUT_FILE_NO;
179 last_pipe_input = STDIN_FILE_NO;
182 if (input_desc != STDIN_FILE_NO)
184 org_stdin = dup (STDIN_FILE_NO);
185 dup2 (input_desc, STDIN_FILE_NO);
189 if (output_desc != STDOUT_FILE_NO)
191 org_stdout = dup (STDOUT_FILE_NO);
192 dup2 (output_desc, STDOUT_FILE_NO);
196 pid = (flags & PEXECUTE_SEARCH ? _spawnvp : _spawnv)
197 (_P_NOWAIT, program, fix_argv(argv));
199 if (input_desc != STDIN_FILE_NO)
201 dup2 (org_stdin, STDIN_FILE_NO);
205 if (output_desc != STDOUT_FILE_NO)
207 dup2 (org_stdout, STDOUT_FILE_NO);
213 *errmsg_fmt = install_error_msg;
214 *errmsg_arg = (char*) program;
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. */
229 pwait (int pid, int *status, int flags ATTRIBUTE_UNUSED)
233 pid = _cwait (&termstat, pid, WAIT_CHILD);
235 /* ??? Here's an opportunity to canonicalize the values in STATUS.
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
245 *status = (((termstat) & 0xff) << 8);