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); 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 int 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) 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 return open (name, 98 (O_WRONLY | O_CREAT | O_TRUNC 99 | (binary ? O_BINARY : O_TEXT)), 100 S_IRUSR | S_IWUSR); 101 } 102 103 /* Close a file. */ 104 105 static int 106 pex_djgpp_close (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd) 107 { 108 return close (fd); 109 } 110 111 /* Execute a child. */ 112 113 static pid_t 114 pex_djgpp_exec_child (struct pex_obj *obj, int flags, const char *executable, 115 char * const * argv, char * const * env, 116 int in, int out, int errdes, 117 int toclose ATTRIBUTE_UNUSED, const char **errmsg, 118 int *err) 119 { 120 int org_in, org_out, org_errdes; 121 int status; 122 int *statuses; 123 124 org_in = -1; 125 org_out = -1; 126 org_errdes = -1; 127 128 if (in != STDIN_FILE_NO) 129 { 130 org_in = dup (STDIN_FILE_NO); 131 if (org_in < 0) 132 { 133 *err = errno; 134 *errmsg = "dup"; 135 return (pid_t) -1; 136 } 137 if (dup2 (in, STDIN_FILE_NO) < 0) 138 { 139 *err = errno; 140 *errmsg = "dup2"; 141 return (pid_t) -1; 142 } 143 if (close (in) < 0) 144 { 145 *err = errno; 146 *errmsg = "close"; 147 return (pid_t) -1; 148 } 149 } 150 151 if (out != STDOUT_FILE_NO) 152 { 153 org_out = dup (STDOUT_FILE_NO); 154 if (org_out < 0) 155 { 156 *err = errno; 157 *errmsg = "dup"; 158 return (pid_t) -1; 159 } 160 if (dup2 (out, STDOUT_FILE_NO) < 0) 161 { 162 *err = errno; 163 *errmsg = "dup2"; 164 return (pid_t) -1; 165 } 166 if (close (out) < 0) 167 { 168 *err = errno; 169 *errmsg = "close"; 170 return (pid_t) -1; 171 } 172 } 173 174 if (errdes != STDERR_FILE_NO 175 || (flags & PEX_STDERR_TO_STDOUT) != 0) 176 { 177 org_errdes = dup (STDERR_FILE_NO); 178 if (org_errdes < 0) 179 { 180 *err = errno; 181 *errmsg = "dup"; 182 return (pid_t) -1; 183 } 184 if (dup2 ((flags & PEX_STDERR_TO_STDOUT) != 0 ? STDOUT_FILE_NO : errdes, 185 STDERR_FILE_NO) < 0) 186 { 187 *err = errno; 188 *errmsg = "dup2"; 189 return (pid_t) -1; 190 } 191 if (errdes != STDERR_FILE_NO) 192 { 193 if (close (errdes) < 0) 194 { 195 *err = errno; 196 *errmsg = "close"; 197 return (pid_t) -1; 198 } 199 } 200 } 201 202 if (env) 203 status = (((flags & PEX_SEARCH) != 0 ? spawnvpe : spawnve) 204 (P_WAIT, executable, argv, env)); 205 else 206 status = (((flags & PEX_SEARCH) != 0 ? spawnvp : spawnv) 207 (P_WAIT, executable, argv)); 208 209 if (status == -1) 210 { 211 *err = errno; 212 *errmsg = ((flags & PEX_SEARCH) != 0) ? "spawnvp" : "spawnv"; 213 } 214 215 if (in != STDIN_FILE_NO) 216 { 217 if (dup2 (org_in, STDIN_FILE_NO) < 0) 218 { 219 *err = errno; 220 *errmsg = "dup2"; 221 return (pid_t) -1; 222 } 223 if (close (org_in) < 0) 224 { 225 *err = errno; 226 *errmsg = "close"; 227 return (pid_t) -1; 228 } 229 } 230 231 if (out != STDOUT_FILE_NO) 232 { 233 if (dup2 (org_out, STDOUT_FILE_NO) < 0) 234 { 235 *err = errno; 236 *errmsg = "dup2"; 237 return (pid_t) -1; 238 } 239 if (close (org_out) < 0) 240 { 241 *err = errno; 242 *errmsg = "close"; 243 return (pid_t) -1; 244 } 245 } 246 247 if (errdes != STDERR_FILE_NO 248 || (flags & PEX_STDERR_TO_STDOUT) != 0) 249 { 250 if (dup2 (org_errdes, STDERR_FILE_NO) < 0) 251 { 252 *err = errno; 253 *errmsg = "dup2"; 254 return (pid_t) -1; 255 } 256 if (close (org_errdes) < 0) 257 { 258 *err = errno; 259 *errmsg = "close"; 260 return (pid_t) -1; 261 } 262 } 263 264 /* Save the exit status for later. When we are called, obj->count 265 is the number of children which have executed before this 266 one. */ 267 statuses = (int *) obj->sysdep; 268 statuses = XRESIZEVEC (int, statuses, obj->count + 1); 269 statuses[obj->count] = status; 270 obj->sysdep = (void *) statuses; 271 272 return (pid_t) obj->count; 273 } 274 275 /* Wait for a child process to complete. Actually the child process 276 has already completed, and we just need to return the exit 277 status. */ 278 279 static int 280 pex_djgpp_wait (struct pex_obj *obj, pid_t pid, int *status, 281 struct pex_time *time, int done ATTRIBUTE_UNUSED, 282 const char **errmsg ATTRIBUTE_UNUSED, 283 int *err ATTRIBUTE_UNUSED) 284 { 285 int *statuses; 286 287 if (time != NULL) 288 memset (time, 0, sizeof *time); 289 290 statuses = (int *) obj->sysdep; 291 *status = statuses[pid]; 292 293 return 0; 294 } 295