| 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 * |
| 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. This |
| 63 | is not necessary on NT, but on W9x, forward slashes causes failure |
| 64 | of spawn* and exec* functions (and probably any function that |
| 65 | calls CreateProcess) *iff* the executable pathname (argvec[0]) is |
| 66 | a quoted string. And quoting is necessary in case a pathname |
| 67 | contains embedded white space. You can't win. */ |
| 68 | for (; *command0 != '\0'; command0++) |
| 69 | if (*command0 == '/') |
| 70 | *command0 = '\\'; |
| 71 | |
| 72 | for (i = 1; argvec[i] != 0; i++) |
| 73 | { |
| 74 | int len, j; |
| 75 | char *temp, *newtemp; |
| 76 | |
| 77 | temp = argvec[i]; |
| 78 | len = strlen (temp); |
| 79 | for (j = 0; j < len; j++) |
| 80 | { |
| 81 | if (temp[j] == '"') |
| 82 | { |
| 83 | newtemp = xmalloc (len + 2); |
| 84 | strncpy (newtemp, temp, j); |
| 85 | newtemp [j] = '\\'; |
| 86 | strncpy (&newtemp [j+1], &temp [j], len-j); |
| 87 | newtemp [len+1] = 0; |
| 88 | temp = newtemp; |
| 89 | len++; |
| 90 | j++; |
| 91 | } |
| 92 | } |
| 93 | |
| 94 | argvec[i] = temp; |
| 95 | } |
| 96 | |
| 97 | for (i = 0; argvec[i] != 0; i++) |
| 98 | { |
| 99 | if (strpbrk (argvec[i], " \t")) |
| 100 | { |
| 101 | int len, trailing_backslash; |
| 102 | char *temp; |
| 103 | |
| 104 | len = strlen (argvec[i]); |
| 105 | trailing_backslash = 0; |
| 106 | |
| 107 | /* There is an added complication when an arg with embedded white |
| 108 | space ends in a backslash (such as in the case of -iprefix arg |
| 109 | passed to cpp). The resulting quoted strings gets misinterpreted |
| 110 | by the command interpreter -- it thinks that the ending quote |
| 111 | is escaped by the trailing backslash and things get confused. |
| 112 | We handle this case by escaping the trailing backslash, provided |
| 113 | it was not escaped in the first place. */ |
| 114 | if (len > 1 |
| 115 | && argvec[i][len-1] == '\\' |
| 116 | && argvec[i][len-2] != '\\') |
| 117 | { |
| 118 | trailing_backslash = 1; |
| 119 | ++len; /* to escape the final backslash. */ |
| 120 | } |
| 121 | |
| 122 | len += 2; /* and for the enclosing quotes. */ |
| 123 | |
| 124 | temp = xmalloc (len + 1); |
| 125 | temp[0] = '"'; |
| 126 | strcpy (temp + 1, argvec[i]); |
| 127 | if (trailing_backslash) |
| 128 | temp[len-2] = '\\'; |
| 129 | temp[len-1] = '"'; |
| 130 | temp[len] = '\0'; |
| 131 | |
| 132 | argvec[i] = temp; |
| 133 | } |
| 134 | } |
| 135 | |
| 136 | return (const char * const *) argvec; |
| 137 | } |
| 138 | |
| 139 | /* Win32 supports pipes */ |
| 140 | int |
| 141 | pexecute (program, argv, this_pname, temp_base, errmsg_fmt, errmsg_arg, flags) |
| 142 | const char *program; |
| 143 | char * const *argv; |
| 144 | const char *this_pname ATTRIBUTE_UNUSED; |
| 145 | const char *temp_base ATTRIBUTE_UNUSED; |
| 146 | char **errmsg_fmt, **errmsg_arg; |
| 147 | int flags; |
| 148 | { |
| 149 | int pid; |
| 150 | int pdes[2]; |
| 151 | int org_stdin = -1; |
| 152 | int org_stdout = -1; |
| 153 | int input_desc, output_desc; |
| 154 | |
| 155 | /* Pipe waiting from last process, to be used as input for the next one. |
| 156 | Value is STDIN_FILE_NO if no pipe is waiting |
| 157 | (i.e. the next command is the first of a group). */ |
| 158 | static int last_pipe_input; |
| 159 | |
| 160 | /* If this is the first process, initialize. */ |
| 161 | if (flags & PEXECUTE_FIRST) |
| 162 | last_pipe_input = STDIN_FILE_NO; |
| 163 | |
| 164 | input_desc = last_pipe_input; |
| 165 | |
| 166 | /* If this isn't the last process, make a pipe for its output, |
| 167 | and record it as waiting to be the input to the next process. */ |
| 168 | if (! (flags & PEXECUTE_LAST)) |
| 169 | { |
| 170 | if (_pipe (pdes, 256, O_BINARY) < 0) |
| 171 | { |
| 172 | *errmsg_fmt = "pipe"; |
| 173 | *errmsg_arg = NULL; |
| 174 | return -1; |
| 175 | } |
| 176 | output_desc = pdes[WRITE_PORT]; |
| 177 | last_pipe_input = pdes[READ_PORT]; |
| 178 | } |
| 179 | else |
| 180 | { |
| 181 | /* Last process. */ |
| 182 | output_desc = STDOUT_FILE_NO; |
| 183 | last_pipe_input = STDIN_FILE_NO; |
| 184 | } |
| 185 | |
| 186 | if (input_desc != STDIN_FILE_NO) |
| 187 | { |
| 188 | org_stdin = dup (STDIN_FILE_NO); |
| 189 | dup2 (input_desc, STDIN_FILE_NO); |
| 190 | close (input_desc); |
| 191 | } |
| 192 | |
| 193 | if (output_desc != STDOUT_FILE_NO) |
| 194 | { |
| 195 | org_stdout = dup (STDOUT_FILE_NO); |
| 196 | dup2 (output_desc, STDOUT_FILE_NO); |
| 197 | close (output_desc); |
| 198 | } |
| 199 | |
| 200 | pid = (flags & PEXECUTE_SEARCH ? _spawnvp : _spawnv) |
| 201 | (_P_NOWAIT, program, fix_argv(argv)); |
| 202 | |
| 203 | if (input_desc != STDIN_FILE_NO) |
| 204 | { |
| 205 | dup2 (org_stdin, STDIN_FILE_NO); |
| 206 | close (org_stdin); |
| 207 | } |
| 208 | |
| 209 | if (output_desc != STDOUT_FILE_NO) |
| 210 | { |
| 211 | dup2 (org_stdout, STDOUT_FILE_NO); |
| 212 | close (org_stdout); |
| 213 | } |
| 214 | |
| 215 | if (pid == -1) |
| 216 | { |
| 217 | *errmsg_fmt = install_error_msg; |
| 218 | *errmsg_arg = (char*) program; |
| 219 | return -1; |
| 220 | } |
| 221 | |
| 222 | return pid; |
| 223 | } |
| 224 | |
| 225 | /* MS CRTDLL doesn't return enough information in status to decide if the |
| 226 | child exited due to a signal or not, rather it simply returns an |
| 227 | integer with the exit code of the child; eg., if the child exited with |
| 228 | an abort() call and didn't have a handler for SIGABRT, it simply returns |
| 229 | with status = 3. We fix the status code to conform to the usual WIF* |
| 230 | macros. Note that WIFSIGNALED will never be true under CRTDLL. */ |
| 231 | |
| 232 | int |
| 233 | pwait (pid, status, flags) |
| 234 | int pid; |
| 235 | int *status; |
| 236 | int flags ATTRIBUTE_UNUSED; |
| 237 | { |
| 238 | int termstat; |
| 239 | |
| 240 | pid = _cwait (&termstat, pid, WAIT_CHILD); |
| 241 | |
| 242 | /* ??? Here's an opportunity to canonicalize the values in STATUS. |
| 243 | Needed? */ |
| 244 | |
| 245 | /* cwait returns the child process exit code in termstat. |
| 246 | A value of 3 indicates that the child caught a signal, but not |
| 247 | which one. Since only SIGABRT, SIGFPE and SIGINT do anything, we |
| 248 | report SIGABRT. */ |
| 249 | if (termstat == 3) |
| 250 | *status = SIGABRT; |
| 251 | else |
| 252 | *status = (((termstat) & 0xff) << 8); |
| 253 | |
| 254 | return pid; |
| 255 | } |