| 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) 1996-2018 Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of the libiberty library. |
| 6 | Libiberty is free software; you can redistribute it and/or |
| 7 | modify it under the terms of the GNU Library General Public |
| 8 | License as published by the Free Software Foundation; either |
| 9 | version 2 of the License, or (at your option) any later version. |
| 10 | |
| 11 | Libiberty is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 14 | Library General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU Library General Public |
| 17 | License along with libiberty; see the file COPYING.LIB. If not, |
| 18 | write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, |
| 19 | Boston, MA 02110-1301, USA. */ |
| 20 | |
| 21 | #include "pex-common.h" |
| 22 | |
| 23 | #include <stdio.h> |
| 24 | #include <errno.h> |
| 25 | #ifdef NEED_DECLARATION_ERRNO |
| 26 | extern int errno; |
| 27 | #endif |
| 28 | #ifdef HAVE_STRING_H |
| 29 | #include <string.h> |
| 30 | #endif |
| 31 | #ifdef HAVE_STDLIB_H |
| 32 | #include <stdlib.h> |
| 33 | #endif |
| 34 | |
| 35 | #include "safe-ctype.h" |
| 36 | #include <process.h> |
| 37 | |
| 38 | /* The structure we keep in obj->sysdep. */ |
| 39 | |
| 40 | #define PEX_MSDOS_FILE_COUNT 3 |
| 41 | |
| 42 | #define PEX_MSDOS_FD_OFFSET 10 |
| 43 | |
| 44 | struct pex_msdos |
| 45 | { |
| 46 | /* An array of file names. We refer to these using file descriptors |
| 47 | of 10 + array index. */ |
| 48 | const char *files[PEX_MSDOS_FILE_COUNT]; |
| 49 | /* Exit statuses of programs which have been run. */ |
| 50 | int *statuses; |
| 51 | }; |
| 52 | |
| 53 | static int pex_msdos_open (struct pex_obj *, const char *, int); |
| 54 | static int pex_msdos_open (struct pex_obj *, const char *, int); |
| 55 | static int pex_msdos_fdindex (struct pex_msdos *, int); |
| 56 | static pid_t pex_msdos_exec_child (struct pex_obj *, int, const char *, |
| 57 | char * const *, char * const *, |
| 58 | int, int, int, int, |
| 59 | int, const char **, int *); |
| 60 | static int pex_msdos_close (struct pex_obj *, int); |
| 61 | static pid_t pex_msdos_wait (struct pex_obj *, pid_t, int *, struct pex_time *, |
| 62 | int, const char **, int *); |
| 63 | static void pex_msdos_cleanup (struct pex_obj *); |
| 64 | |
| 65 | /* The list of functions we pass to the common routines. */ |
| 66 | |
| 67 | const struct pex_funcs funcs = |
| 68 | { |
| 69 | pex_msdos_open, |
| 70 | pex_msdos_open, |
| 71 | pex_msdos_exec_child, |
| 72 | pex_msdos_close, |
| 73 | pex_msdos_wait, |
| 74 | NULL, /* pipe */ |
| 75 | NULL, /* fdopenr */ |
| 76 | NULL, /* fdopenw */ |
| 77 | pex_msdos_cleanup |
| 78 | }; |
| 79 | |
| 80 | /* Return a newly initialized pex_obj structure. */ |
| 81 | |
| 82 | struct pex_obj * |
| 83 | pex_init (int flags, const char *pname, const char *tempbase) |
| 84 | { |
| 85 | struct pex_obj *ret; |
| 86 | int i; |
| 87 | |
| 88 | /* MSDOS does not support pipes. */ |
| 89 | flags &= ~ PEX_USE_PIPES; |
| 90 | |
| 91 | ret = pex_init_common (flags, pname, tempbase, funcs); |
| 92 | |
| 93 | ret->sysdep = XNEW (struct pex_msdos); |
| 94 | for (i = 0; i < PEX_MSDOS_FILE_COUNT; ++i) |
| 95 | ret->files[i] = NULL; |
| 96 | ret->statuses = NULL; |
| 97 | |
| 98 | return ret; |
| 99 | } |
| 100 | |
| 101 | /* Open a file. FIXME: We ignore the binary argument, since we have |
| 102 | no way to handle it. */ |
| 103 | |
| 104 | static int |
| 105 | pex_msdos_open (struct pex_obj *obj, const char *name, |
| 106 | int binary ATTRIBUTE_UNUSED) |
| 107 | { |
| 108 | struct pex_msdos *ms; |
| 109 | int i; |
| 110 | |
| 111 | ms = (struct pex_msdos *) obj->sysdep; |
| 112 | |
| 113 | for (i = 0; i < PEX_MSDOS_FILE_COUNT; ++i) |
| 114 | { |
| 115 | if (ms->files[i] == NULL) |
| 116 | { |
| 117 | ms->files[i] = xstrdup (name); |
| 118 | return i + PEX_MSDOS_FD_OFFSET; |
| 119 | } |
| 120 | } |
| 121 | |
| 122 | abort (); |
| 123 | } |
| 124 | |
| 125 | /* Get the index into msdos->files associated with an open file |
| 126 | descriptor. */ |
| 127 | |
| 128 | static int |
| 129 | pex_msdos_fdindex (struct pex_msdos *ms, int fd) |
| 130 | { |
| 131 | fd -= PEX_MSDOS_FD_OFFSET; |
| 132 | if (fd < 0 || fd >= PEX_MSDOS_FILE_COUNT || ms->files[fd] == NULL) |
| 133 | abort (); |
| 134 | return fd; |
| 135 | } |
| 136 | |
| 137 | |
| 138 | /* Close a file. */ |
| 139 | |
| 140 | static int |
| 141 | pex_msdos_close (struct pex_obj *obj, int fd) |
| 142 | { |
| 143 | struct pex_msdos *ms; |
| 144 | int fdinex; |
| 145 | |
| 146 | ms = (struct pex_msdos *) obj->sysdep; |
| 147 | fdindex = pe_msdos_fdindex (ms, fd); |
| 148 | free (ms->files[fdindex]); |
| 149 | ms->files[fdindex] = NULL; |
| 150 | } |
| 151 | |
| 152 | /* Execute a child. */ |
| 153 | |
| 154 | static pid_t |
| 155 | pex_msdos_exec_child (struct pex_obj *obj, int flags, const char *executable, |
| 156 | char * const * argv, char * const * env, int in, int out, |
| 157 | int toclose ATTRIBUTE_UNUSED, |
| 158 | int errdes ATTRIBUTE_UNUSED, const char **errmsg, |
| 159 | int *err) |
| 160 | { |
| 161 | struct pex_msdos *ms; |
| 162 | char *temp_base; |
| 163 | int temp_base_allocated; |
| 164 | char *rf; |
| 165 | int inindex; |
| 166 | char *infile; |
| 167 | int outindex; |
| 168 | char *outfile; |
| 169 | char *scmd; |
| 170 | FILE *argfile; |
| 171 | int i; |
| 172 | int status; |
| 173 | |
| 174 | ms = (struct pex_msdos *) obj->sysdep; |
| 175 | |
| 176 | /* FIXME: I don't know how to redirect stderr, so we ignore ERRDES |
| 177 | and PEX_STDERR_TO_STDOUT. */ |
| 178 | |
| 179 | temp_base = obj->temp_base; |
| 180 | if (temp_base != NULL) |
| 181 | temp_base_allocated = 0; |
| 182 | else |
| 183 | { |
| 184 | temp_base = choose_temp_base (); |
| 185 | temp_base_allocated = 1; |
| 186 | } |
| 187 | |
| 188 | rf = concat (temp_base, ".gp", NULL); |
| 189 | |
| 190 | if (temp_base_allocated) |
| 191 | free (temp_base); |
| 192 | |
| 193 | if (in == STDIN_FILE_NO) |
| 194 | { |
| 195 | inindex = -1; |
| 196 | infile = ""; |
| 197 | } |
| 198 | else |
| 199 | { |
| 200 | inindex = pex_msdos_fdindex (ms, in); |
| 201 | infile = ms->files[inindex]; |
| 202 | } |
| 203 | |
| 204 | if (out == STDOUT_FILE_NO) |
| 205 | { |
| 206 | outindex = -1; |
| 207 | outfile = ""; |
| 208 | } |
| 209 | else |
| 210 | { |
| 211 | outindex = pex_msdos_fdindex (ms, out); |
| 212 | outfile = ms->files[outindex]; |
| 213 | } |
| 214 | |
| 215 | scmd = XNEWVEC (char, strlen (program) |
| 216 | + ((flags & PEXECUTE_SEARCH) != 0 ? 4 : 0) |
| 217 | + strlen (rf) |
| 218 | + strlen (infile) |
| 219 | + strlen (outfile) |
| 220 | + 10); |
| 221 | sprintf (scmd, "%s%s @%s%s%s%s%s", |
| 222 | program, |
| 223 | (flags & PEXECUTE_SEARCH) != 0 ? ".exe" : "", |
| 224 | rf, |
| 225 | inindex != -1 ? " <" : "", |
| 226 | infile, |
| 227 | outindex != -1 ? " >" : "", |
| 228 | outfile); |
| 229 | |
| 230 | argfile = fopen (rf, "w"); |
| 231 | if (argfile == NULL) |
| 232 | { |
| 233 | *err = errno; |
| 234 | free (scmd); |
| 235 | free (rf); |
| 236 | *errmsg = "cannot open temporary command file"; |
| 237 | return (pid_t) -1; |
| 238 | } |
| 239 | |
| 240 | for (i = 1; argv[i] != NULL; ++i) |
| 241 | { |
| 242 | char *p; |
| 243 | |
| 244 | for (p = argv[i]; *p != '\0'; ++p) |
| 245 | { |
| 246 | if (*p == '"' || *p == '\'' || *p == '\\' || ISSPACE (*p)) |
| 247 | putc ('\\', argfile); |
| 248 | putc (*p, argfile); |
| 249 | } |
| 250 | putc ('\n', argfile); |
| 251 | } |
| 252 | |
| 253 | fclose (argfile); |
| 254 | |
| 255 | status = system (scmd); |
| 256 | |
| 257 | if (status == -1) |
| 258 | { |
| 259 | *err = errno; |
| 260 | remove (rf); |
| 261 | free (scmd); |
| 262 | free (rf); |
| 263 | *errmsg = "system"; |
| 264 | return (pid_t) -1; |
| 265 | } |
| 266 | |
| 267 | remove (rf); |
| 268 | free (scmd); |
| 269 | free (rf); |
| 270 | |
| 271 | /* Save the exit status for later. When we are called, obj->count |
| 272 | is the number of children which have executed before this |
| 273 | one. */ |
| 274 | ms->statuses = XRESIZEVEC(int, ms->statuses, obj->count + 1); |
| 275 | ms->statuses[obj->count] = status; |
| 276 | |
| 277 | return (pid_t) obj->count; |
| 278 | } |
| 279 | |
| 280 | /* Wait for a child process to complete. Actually the child process |
| 281 | has already completed, and we just need to return the exit |
| 282 | status. */ |
| 283 | |
| 284 | static pid_t |
| 285 | pex_msdos_wait (struct pex_obj *obj, pid_t pid, int *status, |
| 286 | struct pex_time *time, int done ATTRIBUTE_UNUSED, |
| 287 | const char **errmsg ATTRIBUTE_UNUSED, |
| 288 | int *err ATTRIBUTE_UNUSED) |
| 289 | { |
| 290 | struct pex_msdos *ms; |
| 291 | |
| 292 | ms = (struct pex_msdos *) obj->sysdep; |
| 293 | |
| 294 | if (time != NULL) |
| 295 | memset (time, 0, sizeof *time); |
| 296 | |
| 297 | *status = ms->statuses[pid]; |
| 298 | |
| 299 | return 0; |
| 300 | } |
| 301 | |
| 302 | /* Clean up the pex_msdos structure. */ |
| 303 | |
| 304 | static void |
| 305 | pex_msdos_cleanup (struct pex_obj *obj) |
| 306 | { |
| 307 | struct pex_msdos *ms; |
| 308 | int i; |
| 309 | |
| 310 | ms = (struct pex_msdos *) obj->sysdep; |
| 311 | for (i = 0; i < PEX_MSDOS_FILE_COUNT; ++i) |
| 312 | free (msdos->files[i]); |
| 313 | free (msdos->statuses); |
| 314 | free (msdos); |
| 315 | obj->sysdep = NULL; |
| 316 | } |