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
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 *
fix_argv(argvec)56 fix_argv (argvec)
57 char **argvec;
58 {
59 int i;
60 char * command0 = argvec[0];
61
62 /* Ensure that the executable pathname uses Win32 backslashes. */
63 for (; *command0 != '\0'; command0++)
64 if (*command0 == '/')
65 *command0 = '\\';
66
67 for (i = 1; argvec[i] != 0; i++)
68 {
69 int len, j;
70 char *temp, *newtemp;
71
72 temp = argvec[i];
73 len = strlen (temp);
74 for (j = 0; j < len; j++)
75 {
76 if (temp[j] == '"')
77 {
78 newtemp = xmalloc (len + 2);
79 strncpy (newtemp, temp, j);
80 newtemp [j] = '\\';
81 strncpy (&newtemp [j+1], &temp [j], len-j);
82 newtemp [len+1] = 0;
83 temp = newtemp;
84 len++;
85 j++;
86 }
87 }
88
89 argvec[i] = temp;
90 }
91
92 for (i = 0; argvec[i] != 0; i++)
93 {
94 if (strpbrk (argvec[i], " \t"))
95 {
96 int len, trailing_backslash;
97 char *temp;
98
99 len = strlen (argvec[i]);
100 trailing_backslash = 0;
101
102 /* There is an added complication when an arg with embedded white
103 space ends in a backslash (such as in the case of -iprefix arg
104 passed to cpp). The resulting quoted strings gets misinterpreted
105 by the command interpreter -- it thinks that the ending quote
106 is escaped by the trailing backslash and things get confused.
107 We handle this case by escaping the trailing backslash, provided
108 it was not escaped in the first place. */
109 if (len > 1
110 && argvec[i][len-1] == '\\'
111 && argvec[i][len-2] != '\\')
112 {
113 trailing_backslash = 1;
114 ++len; /* to escape the final backslash. */
115 }
116
117 len += 2; /* and for the enclosing quotes. */
118
119 temp = xmalloc (len + 1);
120 temp[0] = '"';
121 strcpy (temp + 1, argvec[i]);
122 if (trailing_backslash)
123 temp[len-2] = '\\';
124 temp[len-1] = '"';
125 temp[len] = '\0';
126
127 argvec[i] = temp;
128 }
129 }
130
131 return (const char * const *) argvec;
132 }
133
134 /* Win32 supports pipes */
135 int
pexecute(program,argv,this_pname,temp_base,errmsg_fmt,errmsg_arg,flags)136 pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags)
137 const char *program;
138 char * const *argv;
139 const char *this_pname ATTRIBUTE_UNUSED;
140 const char *temp_base ATTRIBUTE_UNUSED;
141 char **errmsg_fmt, **errmsg_arg;
142 int flags;
143 {
144 int pid;
145 int pdes[2];
146 int org_stdin = -1;
147 int org_stdout = -1;
148 int input_desc, output_desc;
149
150 /* Pipe waiting from last process, to be used as input for the next one.
151 Value is STDIN_FILE_NO if no pipe is waiting
152 (i.e. the next command is the first of a group). */
153 static int last_pipe_input;
154
155 /* If this is the first process, initialize. */
156 if (flags & PEXECUTE_FIRST)
157 last_pipe_input = STDIN_FILE_NO;
158
159 input_desc = last_pipe_input;
160
161 /* If this isn't the last process, make a pipe for its output,
162 and record it as waiting to be the input to the next process. */
163 if (! (flags & PEXECUTE_LAST))
164 {
165 if (_pipe (pdes, 256, O_BINARY) < 0)
166 {
167 *errmsg_fmt = "pipe";
168 *errmsg_arg = NULL;
169 return -1;
170 }
171 output_desc = pdes[WRITE_PORT];
172 last_pipe_input = pdes[READ_PORT];
173 }
174 else
175 {
176 /* Last process. */
177 output_desc = STDOUT_FILE_NO;
178 last_pipe_input = STDIN_FILE_NO;
179 }
180
181 if (input_desc != STDIN_FILE_NO)
182 {
183 org_stdin = dup (STDIN_FILE_NO);
184 dup2 (input_desc, STDIN_FILE_NO);
185 close (input_desc);
186 }
187
188 if (output_desc != STDOUT_FILE_NO)
189 {
190 org_stdout = dup (STDOUT_FILE_NO);
191 dup2 (output_desc, STDOUT_FILE_NO);
192 close (output_desc);
193 }
194
195 pid = (flags & PEXECUTE_SEARCH ? _spawnvp : _spawnv)
196 (_P_NOWAIT, program, fix_argv(argv));
197
198 if (input_desc != STDIN_FILE_NO)
199 {
200 dup2 (org_stdin, STDIN_FILE_NO);
201 close (org_stdin);
202 }
203
204 if (output_desc != STDOUT_FILE_NO)
205 {
206 dup2 (org_stdout, STDOUT_FILE_NO);
207 close (org_stdout);
208 }
209
210 if (pid == -1)
211 {
212 *errmsg_fmt = install_error_msg;
213 *errmsg_arg = (char*) program;
214 return -1;
215 }
216
217 return pid;
218 }
219
220 /* MS CRTDLL doesn't return enough information in status to decide if the
221 child exited due to a signal or not, rather it simply returns an
222 integer with the exit code of the child; eg., if the child exited with
223 an abort() call and didn't have a handler for SIGABRT, it simply returns
224 with status = 3. We fix the status code to conform to the usual WIF*
225 macros. Note that WIFSIGNALED will never be true under CRTDLL. */
226
227 int
pwait(pid,status,flags)228 pwait (pid, status, flags)
229 int pid;
230 int *status;
231 int flags ATTRIBUTE_UNUSED;
232 {
233 int termstat;
234
235 pid = _cwait (&termstat, pid, WAIT_CHILD);
236
237 /* ??? Here's an opportunity to canonicalize the values in STATUS.
238 Needed? */
239
240 /* cwait returns the child process exit code in termstat.
241 A value of 3 indicates that the child caught a signal, but not
242 which one. Since only SIGABRT, SIGFPE and SIGINT do anything, we
243 report SIGABRT. */
244 if (termstat == 3)
245 *status = SIGABRT;
246 else
247 *status = (((termstat) & 0xff) << 8);
248
249 return pid;
250 }
251