1 /* Utilities to execute a program in a subprocess (possibly linked by pipes 2 with other subprocesses), and wait for it. Generic MSDOS specialization. 3 Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2003, 2005 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., 51 Franklin Street - Fifth Floor, 20 Boston, MA 02110-1301, USA. */ 21 22 #include "pex-common.h" 23 24 #include <stdio.h> 25 #include <errno.h> 26 #ifdef NEED_DECLARATION_ERRNO 27 extern int errno; 28 #endif 29 #ifdef HAVE_STRING_H 30 #include <string.h> 31 #endif 32 #ifdef HAVE_STDLIB_H 33 #include <stdlib.h> 34 #endif 35 36 #include "safe-ctype.h" 37 #include <process.h> 38 39 /* The structure we keep in obj->sysdep. */ 40 41 #define PEX_MSDOS_FILE_COUNT 3 42 43 #define PEX_MSDOS_FD_OFFSET 10 44 45 struct pex_msdos 46 { 47 /* An array of file names. We refer to these using file descriptors 48 of 10 + array index. */ 49 const char *files[PEX_MSDOS_FILE_COUNT]; 50 /* Exit statuses of programs which have been run. */ 51 int *statuses; 52 }; 53 54 static int pex_msdos_open (struct pex_obj *, const char *, int); 55 static int pex_msdos_open (struct pex_obj *, const char *, int); 56 static int pex_msdos_fdindex (struct pex_msdos *, int); 57 static pid_t pex_msdos_exec_child (struct pex_obj *, int, const char *, 58 char * const *, char * const *, 59 int, int, int, int, 60 int, const char **, int *); 61 static int pex_msdos_close (struct pex_obj *, int); 62 static pid_t pex_msdos_wait (struct pex_obj *, pid_t, int *, struct pex_time *, 63 int, const char **, int *); 64 static void pex_msdos_cleanup (struct pex_obj *); 65 66 /* The list of functions we pass to the common routines. */ 67 68 const struct pex_funcs funcs = 69 { 70 pex_msdos_open, 71 pex_msdos_open, 72 pex_msdos_exec_child, 73 pex_msdos_close, 74 pex_msdos_wait, 75 NULL, /* pipe */ 76 NULL, /* fdopenr */ 77 NULL, /* fdopenw */ 78 pex_msdos_cleanup 79 }; 80 81 /* Return a newly initialized pex_obj structure. */ 82 83 struct pex_obj * 84 pex_init (int flags, const char *pname, const char *tempbase) 85 { 86 struct pex_obj *ret; 87 int i; 88 89 /* MSDOS does not support pipes. */ 90 flags &= ~ PEX_USE_PIPES; 91 92 ret = pex_init_common (flags, pname, tempbase, funcs); 93 94 ret->sysdep = XNEW (struct pex_msdos); 95 for (i = 0; i < PEX_MSDOS_FILE_COUNT; ++i) 96 ret->files[i] = NULL; 97 ret->statuses = NULL; 98 99 return ret; 100 } 101 102 /* Open a file. FIXME: We ignore the binary argument, since we have 103 no way to handle it. */ 104 105 static int 106 pex_msdos_open (struct pex_obj *obj, const char *name, 107 int binary ATTRIBUTE_UNUSED) 108 { 109 struct pex_msdos *ms; 110 int i; 111 112 ms = (struct pex_msdos *) obj->sysdep; 113 114 for (i = 0; i < PEX_MSDOS_FILE_COUNT; ++i) 115 { 116 if (ms->files[i] == NULL) 117 { 118 ms->files[i] = xstrdup (name); 119 return i + PEX_MSDOS_FD_OFFSET; 120 } 121 } 122 123 abort (); 124 } 125 126 /* Get the index into msdos->files associated with an open file 127 descriptor. */ 128 129 static int 130 pex_msdos_fdindex (struct pex_msdos *ms, int fd) 131 { 132 fd -= PEX_MSDOS_FD_OFFSET; 133 if (fd < 0 || fd >= PEX_MSDOS_FILE_COUNT || ms->files[fd] == NULL) 134 abort (); 135 return fd; 136 } 137 138 139 /* Close a file. */ 140 141 static int 142 pex_msdos_close (struct pex_obj *obj, int fd) 143 { 144 struct pex_msdos *ms; 145 int fdinex; 146 147 ms = (struct pex_msdos *) obj->sysdep; 148 fdindex = pe_msdos_fdindex (ms, fd); 149 free (ms->files[fdindex]); 150 ms->files[fdindex] = NULL; 151 } 152 153 /* Execute a child. */ 154 155 static pid_t 156 pex_msdos_exec_child (struct pex_obj *obj, int flags, const char *executable, 157 char * const * argv, char * const * env, int in, int out, 158 int toclose ATTRIBUTE_UNUSED, 159 int errdes ATTRIBUTE_UNUSED, const char **errmsg, 160 int *err) 161 { 162 struct pex_msdos *ms; 163 char *temp_base; 164 int temp_base_allocated; 165 char *rf; 166 int inindex; 167 char *infile; 168 int outindex; 169 char *outfile; 170 char *scmd; 171 FILE *argfile; 172 int i; 173 int status; 174 175 ms = (struct pex_msdos *) obj->sysdep; 176 177 /* FIXME: I don't know how to redirect stderr, so we ignore ERRDES 178 and PEX_STDERR_TO_STDOUT. */ 179 180 temp_base = obj->temp_base; 181 if (temp_base != NULL) 182 temp_base_allocated = 0; 183 else 184 { 185 temp_base = choose_temp_base (); 186 temp_base_allocated = 1; 187 } 188 189 rf = concat (temp_base, ".gp", NULL); 190 191 if (temp_base_allocated) 192 free (temp_base); 193 194 if (in == STDIN_FILE_NO) 195 { 196 inindex = -1; 197 infile = ""; 198 } 199 else 200 { 201 inindex = pex_msdos_fdindex (ms, in); 202 infile = ms->files[inindex]; 203 } 204 205 if (out == STDOUT_FILE_NO) 206 { 207 outindex = -1; 208 outfile = ""; 209 } 210 else 211 { 212 outindex = pex_msdos_fdindex (ms, out); 213 outfile = ms->files[outindex]; 214 } 215 216 scmd = XNEWVEC (char, strlen (program) 217 + ((flags & PEXECUTE_SEARCH) != 0 ? 4 : 0) 218 + strlen (rf) 219 + strlen (infile) 220 + strlen (outfile) 221 + 10); 222 sprintf (scmd, "%s%s @%s%s%s%s%s", 223 program, 224 (flags & PEXECUTE_SEARCH) != 0 ? ".exe" : "", 225 rf, 226 inindex != -1 ? " <" : "", 227 infile, 228 outindex != -1 ? " >" : "", 229 outfile); 230 231 argfile = fopen (rf, "w"); 232 if (argfile == NULL) 233 { 234 *err = errno; 235 free (scmd); 236 free (rf); 237 *errmsg = "cannot open temporary command file"; 238 return (pid_t) -1; 239 } 240 241 for (i = 1; argv[i] != NULL; ++i) 242 { 243 char *p; 244 245 for (p = argv[i]; *p != '\0'; ++p) 246 { 247 if (*p == '"' || *p == '\'' || *p == '\\' || ISSPACE (*p)) 248 putc ('\\', argfile); 249 putc (*p, argfile); 250 } 251 putc ('\n', argfile); 252 } 253 254 fclose (argfile); 255 256 status = system (scmd); 257 258 if (status == -1) 259 { 260 *err = errno; 261 remove (rf); 262 free (scmd); 263 free (rf); 264 *errmsg = "system"; 265 return (pid_t) -1; 266 } 267 268 remove (rf); 269 free (scmd); 270 free (rf); 271 272 /* Save the exit status for later. When we are called, obj->count 273 is the number of children which have executed before this 274 one. */ 275 ms->statuses = XRESIZEVEC(int, ms->statuses, obj->count + 1); 276 ms->statuses[obj->count] = status; 277 278 return (pid_t) obj->count; 279 } 280 281 /* Wait for a child process to complete. Actually the child process 282 has already completed, and we just need to return the exit 283 status. */ 284 285 static pid_t 286 pex_msdos_wait (struct pex_obj *obj, pid_t pid, int *status, 287 struct pex_time *time, int done ATTRIBUTE_UNUSED, 288 const char **errmsg ATTRIBUTE_UNUSED, 289 int *err ATTRIBUTE_UNUSED) 290 { 291 struct pex_msdos *ms; 292 293 ms = (struct pex_msdos *) obj->sysdep; 294 295 if (time != NULL) 296 memset (time, 0, sizeof *time); 297 298 *status = ms->statuses[pid]; 299 300 return 0; 301 } 302 303 /* Clean up the pex_msdos structure. */ 304 305 static void 306 pex_msdos_cleanup (struct pex_obj *obj) 307 { 308 struct pex_msdos *ms; 309 int i; 310 311 ms = (struct pex_msdos *) obj->sysdep; 312 for (i = 0; i < PEX_MSDOS_FILE_COUNT; ++i) 313 free (msdos->files[i]); 314 free (msdos->statuses); 315 free (msdos); 316 obj->sysdep = NULL; 317 } 318
