1 /* Utilities to execute a program in a subprocess (possibly linked by pipes 2 with other subprocesses), and wait for it. DJGPP 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_STDLIB_H 30 #include <stdlib.h> 31 #endif 32 #include <string.h> 33 #include <fcntl.h> 34 #include <unistd.h> 35 #include <sys/stat.h> 36 #include <process.h> 37 38 /* Use ECHILD if available, otherwise use EINVAL. */ 39 #ifdef ECHILD 40 #define PWAIT_ERROR ECHILD 41 #else 42 #define PWAIT_ERROR EINVAL 43 #endif 44 45 static int pex_djgpp_open_read (struct pex_obj *, const char *, int); 46 static int pex_djgpp_open_write (struct pex_obj *, const char *, int, int); 47 static pid_t pex_djgpp_exec_child (struct pex_obj *, int, const char *, 48 char * const *, char * const *, 49 int, int, int, int, 50 const char **, int *); 51 static int pex_djgpp_close (struct pex_obj *, int); 52 static pid_t pex_djgpp_wait (struct pex_obj *, pid_t, int *, struct pex_time *, 53 int, const char **, int *); 54 55 /* The list of functions we pass to the common routines. */ 56 57 const struct pex_funcs funcs = 58 { 59 pex_djgpp_open_read, 60 pex_djgpp_open_write, 61 pex_djgpp_exec_child, 62 pex_djgpp_close, 63 pex_djgpp_wait, 64 NULL, /* pipe */ 65 NULL, /* fdopenr */ 66 NULL, /* fdopenw */ 67 NULL /* cleanup */ 68 }; 69 70 /* Return a newly initialized pex_obj structure. */ 71 72 struct pex_obj * 73 pex_init (int flags, const char *pname, const char *tempbase) 74 { 75 /* DJGPP does not support pipes. */ 76 flags &= ~ PEX_USE_PIPES; 77 return pex_init_common (flags, pname, tempbase, &funcs); 78 } 79 80 /* Open a file for reading. */ 81 82 static int 83 pex_djgpp_open_read (struct pex_obj *obj ATTRIBUTE_UNUSED, 84 const char *name, int binary) 85 { 86 return open (name, O_RDONLY | (binary ? O_BINARY : O_TEXT)); 87 } 88 89 /* Open a file for writing. */ 90 91 static int 92 pex_djgpp_open_write (struct pex_obj *obj ATTRIBUTE_UNUSED, 93 const char *name, int binary, int append) 94 { 95 /* Note that we can't use O_EXCL here because gcc may have already 96 created the temporary file via make_temp_file. */ 97 if (append) 98 return -1; 99 return open (name, 100 (O_WRONLY | O_CREAT | O_TRUNC 101 | (binary ? O_BINARY : O_TEXT)), 102 S_IRUSR | S_IWUSR); 103 } 104 105 /* Close a file. */ 106 107 static int 108 pex_djgpp_close (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd) 109 { 110 return close (fd); 111 } 112 113 /* Execute a child. */ 114 115 static pid_t 116 pex_djgpp_exec_child (struct pex_obj *obj, int flags, const char *executable, 117 char * const * argv, char * const * env, 118 int in, int out, int errdes, 119 int toclose ATTRIBUTE_UNUSED, const char **errmsg, 120 int *err) 121 { 122 int org_in, org_out, org_errdes; 123 int status; 124 int *statuses; 125 126 org_in = -1; 127 org_out = -1; 128 org_errdes = -1; 129 130 if (in != STDIN_FILE_NO) 131 { 132 org_in = dup (STDIN_FILE_NO); 133 if (org_in < 0) 134 { 135 *err = errno; 136 *errmsg = "dup"; 137 return (pid_t) -1; 138 } 139 if (dup2 (in, STDIN_FILE_NO) < 0) 140 { 141 *err = errno; 142 *errmsg = "dup2"; 143 return (pid_t) -1; 144 } 145 if (close (in) < 0) 146 { 147 *err = errno; 148 *errmsg = "close"; 149 return (pid_t) -1; 150 } 151 } 152 153 if (out != STDOUT_FILE_NO) 154 { 155 org_out = dup (STDOUT_FILE_NO); 156 if (org_out < 0) 157 { 158 *err = errno; 159 *errmsg = "dup"; 160 return (pid_t) -1; 161 } 162 if (dup2 (out, STDOUT_FILE_NO) < 0) 163 { 164 *err = errno; 165 *errmsg = "dup2"; 166 return (pid_t) -1; 167 } 168 if (close (out) < 0) 169 { 170 *err = errno; 171 *errmsg = "close"; 172 return (pid_t) -1; 173 } 174 } 175 176 if (errdes != STDERR_FILE_NO 177 || (flags & PEX_STDERR_TO_STDOUT) != 0) 178 { 179 org_errdes = dup (STDERR_FILE_NO); 180 if (org_errdes < 0) 181 { 182 *err = errno; 183 *errmsg = "dup"; 184 return (pid_t) -1; 185 } 186 if (dup2 ((flags & PEX_STDERR_TO_STDOUT) != 0 ? STDOUT_FILE_NO : errdes, 187 STDERR_FILE_NO) < 0) 188 { 189 *err = errno; 190 *errmsg = "dup2"; 191 return (pid_t) -1; 192 } 193 if (errdes != STDERR_FILE_NO) 194 { 195 if (close (errdes) < 0) 196 { 197 *err = errno; 198 *errmsg = "close"; 199 return (pid_t) -1; 200 } 201 } 202 } 203 204 if (env) 205 status = (((flags & PEX_SEARCH) != 0 ? spawnvpe : spawnve) 206 (P_WAIT, executable, argv, env)); 207 else 208 status = (((flags & PEX_SEARCH) != 0 ? spawnvp : spawnv) 209 (P_WAIT, executable, argv)); 210 211 if (status == -1) 212 { 213 *err = errno; 214 *errmsg = ((flags & PEX_SEARCH) != 0) ? "spawnvp" : "spawnv"; 215 } 216 217 if (in != STDIN_FILE_NO) 218 { 219 if (dup2 (org_in, STDIN_FILE_NO) < 0) 220 { 221 *err = errno; 222 *errmsg = "dup2"; 223 return (pid_t) -1; 224 } 225 if (close (org_in) < 0) 226 { 227 *err = errno; 228 *errmsg = "close"; 229 return (pid_t) -1; 230 } 231 } 232 233 if (out != STDOUT_FILE_NO) 234 { 235 if (dup2 (org_out, STDOUT_FILE_NO) < 0) 236 { 237 *err = errno; 238 *errmsg = "dup2"; 239 return (pid_t) -1; 240 } 241 if (close (org_out) < 0) 242 { 243 *err = errno; 244 *errmsg = "close"; 245 return (pid_t) -1; 246 } 247 } 248 249 if (errdes != STDERR_FILE_NO 250 || (flags & PEX_STDERR_TO_STDOUT) != 0) 251 { 252 if (dup2 (org_errdes, STDERR_FILE_NO) < 0) 253 { 254 *err = errno; 255 *errmsg = "dup2"; 256 return (pid_t) -1; 257 } 258 if (close (org_errdes) < 0) 259 { 260 *err = errno; 261 *errmsg = "close"; 262 return (pid_t) -1; 263 } 264 } 265 266 /* Save the exit status for later. When we are called, obj->count 267 is the number of children which have executed before this 268 one. */ 269 statuses = (int *) obj->sysdep; 270 statuses = XRESIZEVEC (int, statuses, obj->count + 1); 271 statuses[obj->count] = status; 272 obj->sysdep = (void *) statuses; 273 274 return (pid_t) obj->count; 275 } 276 277 /* Wait for a child process to complete. Actually the child process 278 has already completed, and we just need to return the exit 279 status. */ 280 281 static pid_t 282 pex_djgpp_wait (struct pex_obj *obj, pid_t pid, int *status, 283 struct pex_time *time, int done ATTRIBUTE_UNUSED, 284 const char **errmsg ATTRIBUTE_UNUSED, 285 int *err ATTRIBUTE_UNUSED) 286 { 287 int *statuses; 288 289 if (time != NULL) 290 memset (time, 0, sizeof *time); 291 292 statuses = (int *) obj->sysdep; 293 *status = statuses[pid]; 294 295 return 0; 296 } 297
