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) 1996-2022 Free Software Foundation, Inc. 4 5This file is part of the libiberty library. 6Libiberty is free software; you can redistribute it and/or 7modify it under the terms of the GNU Library General Public 8License as published by the Free Software Foundation; either 9version 2 of the License, or (at your option) any later version. 10 11Libiberty is distributed in the hope that it will be useful, 12but WITHOUT ANY WARRANTY; without even the implied warranty of 13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14Library General Public License for more details. 15 16You should have received a copy of the GNU Library General Public 17License along with libiberty; see the file COPYING.LIB. If not, 18write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, 19Boston, MA 02110-1301, USA. */ 20 21#include "pex-common.h" 22 23#include <stdio.h> 24#include <errno.h> 25#ifdef NEED_DECLARATION_ERRNO 26extern 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 44struct 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 53static int pex_msdos_open (struct pex_obj *, const char *, int); 54static int pex_msdos_open (struct pex_obj *, const char *, int); 55static int pex_msdos_fdindex (struct pex_msdos *, int); 56static 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 *); 60static int pex_msdos_close (struct pex_obj *, int); 61static pid_t pex_msdos_wait (struct pex_obj *, pid_t, int *, struct pex_time *, 62 int, const char **, int *); 63static void pex_msdos_cleanup (struct pex_obj *); 64 65/* The list of functions we pass to the common routines. */ 66 67const 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 82struct pex_obj * 83pex_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 104static int 105pex_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 128static int 129pex_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 140static int 141pex_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 154static pid_t 155pex_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 284static pid_t 285pex_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 304static void 305pex_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} 317