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 6This file is part of the libiberty library. 7Libiberty is free software; you can redistribute it and/or 8modify it under the terms of the GNU Library General Public 9License as published by the Free Software Foundation; either 10version 2 of the License, or (at your option) any later version. 11 12Libiberty is distributed in the hope that it will be useful, 13but WITHOUT ANY WARRANTY; without even the implied warranty of 14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15Library General Public License for more details. 16 17You should have received a copy of the GNU Library General Public 18License along with libiberty; see the file COPYING.LIB. If not, 19write to the Free Software Foundation, Inc., 51 Franklin Street - Fifth Floor, 20Boston, MA 02110-1301, USA. */ 21 22#include "pex-common.h" 23 24#include <stdio.h> 25#include <errno.h> 26#ifdef NEED_DECLARATION_ERRNO 27extern 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 45static int pex_djgpp_open_read (struct pex_obj *, const char *, int); 46static int pex_djgpp_open_write (struct pex_obj *, const char *, int); 47static long pex_djgpp_exec_child (struct pex_obj *, int, const char *, 48 char * const *, int, int, int, 49 const char **, int *); 50static int pex_djgpp_close (struct pex_obj *, int); 51static int pex_djgpp_wait (struct pex_obj *, long, int *, struct pex_time *, 52 int, const char **, int *); 53 54/* The list of functions we pass to the common routines. */ 55 56const struct pex_funcs funcs = 57{ 58 pex_djgpp_open_read, 59 pex_djgpp_open_write, 60 pex_djgpp_exec_child, 61 pex_djgpp_close, 62 pex_djgpp_wait, 63 NULL, /* pipe */ 64 NULL, /* fdopenr */ 65 NULL, /* fdopenw */ 66 NULL /* cleanup */ 67}; 68 69/* Return a newly initialized pex_obj structure. */ 70 71struct pex_obj * 72pex_init (int flags, const char *pname, const char *tempbase) 73{ 74 /* DJGPP does not support pipes. */ 75 flags &= ~ PEX_USE_PIPES; 76 return pex_init_common (flags, pname, tempbase, &funcs); 77} 78 79/* Open a file for reading. */ 80 81static int 82pex_djgpp_open_read (struct pex_obj *obj ATTRIBUTE_UNUSED, 83 const char *name, int binary) 84{ 85 return open (name, O_RDONLY | (binary ? O_BINARY : O_TEXT)); 86} 87 88/* Open a file for writing. */ 89 90static int 91pex_djgpp_open_write (struct pex_obj *obj ATTRIBUTE_UNUSED, 92 const char *name, int binary) 93{ 94 /* Note that we can't use O_EXCL here because gcc may have already 95 created the temporary file via make_temp_file. */ 96 return open (name, 97 (O_WRONLY | O_CREAT | O_TRUNC 98 | (binary ? O_BINARY : O_TEXT)), 99 S_IRUSR | S_IWUSR); 100} 101 102/* Close a file. */ 103 104static int 105pex_djgpp_close (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd) 106{ 107 return close (fd); 108} 109 110/* Execute a child. */ 111 112static long 113pex_djgpp_exec_child (struct pex_obj *obj, int flags, const char *executable, 114 char * const * argv, int in, int out, int errdes, 115 const char **errmsg, int *err) 116{ 117 int org_in, org_out, org_errdes; 118 int status; 119 int *statuses; 120 121 org_in = -1; 122 org_out = -1; 123 org_errdes = -1; 124 125 if (in != STDIN_FILE_NO) 126 { 127 org_in = dup (STDIN_FILE_NO); 128 if (org_in < 0) 129 { 130 *err = errno; 131 *errmsg = "dup"; 132 return -1; 133 } 134 if (dup2 (in, STDIN_FILE_NO) < 0) 135 { 136 *err = errno; 137 *errmsg = "dup2"; 138 return -1; 139 } 140 if (close (in) < 0) 141 { 142 *err = errno; 143 *errmsg = "close"; 144 return -1; 145 } 146 } 147 148 if (out != STDOUT_FILE_NO) 149 { 150 org_out = dup (STDOUT_FILE_NO); 151 if (org_out < 0) 152 { 153 *err = errno; 154 *errmsg = "dup"; 155 return -1; 156 } 157 if (dup2 (out, STDOUT_FILE_NO) < 0) 158 { 159 *err = errno; 160 *errmsg = "dup2"; 161 return -1; 162 } 163 if (close (out) < 0) 164 { 165 *err = errno; 166 *errmsg = "close"; 167 return -1; 168 } 169 } 170 171 if (errdes != STDERR_FILE_NO 172 || (flags & PEX_STDERR_TO_STDOUT) != 0) 173 { 174 org_errdes = dup (STDERR_FILE_NO); 175 if (org_errdes < 0) 176 { 177 *err = errno; 178 *errmsg = "dup"; 179 return -1; 180 } 181 if (dup2 ((flags & PEX_STDERR_TO_STDOUT) != 0 ? STDOUT_FILE_NO : errdes, 182 STDERR_FILE_NO) < 0) 183 { 184 *err = errno; 185 *errmsg = "dup2"; 186 return -1; 187 } 188 if (errdes != STDERR_FILE_NO) 189 { 190 if (close (errdes) < 0) 191 { 192 *err = errno; 193 *errmsg = "close"; 194 return -1; 195 } 196 } 197 } 198 199 status = (((flags & PEX_SEARCH) != 0 ? spawnvp : spawnv) 200 (P_WAIT, executable, (char * const *) argv)); 201 202 if (status == -1) 203 { 204 *err = errno; 205 *errmsg = ((flags & PEX_SEARCH) != 0) ? "spawnvp" : "spawnv"; 206 } 207 208 if (in != STDIN_FILE_NO) 209 { 210 if (dup2 (org_in, STDIN_FILE_NO) < 0) 211 { 212 *err = errno; 213 *errmsg = "dup2"; 214 return -1; 215 } 216 if (close (org_in) < 0) 217 { 218 *err = errno; 219 *errmsg = "close"; 220 return -1; 221 } 222 } 223 224 if (out != STDOUT_FILE_NO) 225 { 226 if (dup2 (org_out, STDOUT_FILE_NO) < 0) 227 { 228 *err = errno; 229 *errmsg = "dup2"; 230 return -1; 231 } 232 if (close (org_out) < 0) 233 { 234 *err = errno; 235 *errmsg = "close"; 236 return -1; 237 } 238 } 239 240 if (errdes != STDERR_FILE_NO 241 || (flags & PEX_STDERR_TO_STDOUT) != 0) 242 { 243 if (dup2 (org_errdes, STDERR_FILE_NO) < 0) 244 { 245 *err = errno; 246 *errmsg = "dup2"; 247 return -1; 248 } 249 if (close (org_errdes) < 0) 250 { 251 *err = errno; 252 *errmsg = "close"; 253 return -1; 254 } 255 } 256 257 /* Save the exit status for later. When we are called, obj->count 258 is the number of children which have executed before this 259 one. */ 260 statuses = (int *) obj->sysdep; 261 statuses = XRESIZEVEC (int, statuses, obj->count + 1); 262 statuses[obj->count] = status; 263 obj->sysdep = (void *) statuses; 264 265 return obj->count; 266} 267 268/* Wait for a child process to complete. Actually the child process 269 has already completed, and we just need to return the exit 270 status. */ 271 272static int 273pex_djgpp_wait (struct pex_obj *obj, long pid, int *status, 274 struct pex_time *time, int done ATTRIBUTE_UNUSED, 275 const char **errmsg ATTRIBUTE_UNUSED, 276 int *err ATTRIBUTE_UNUSED) 277{ 278 int *statuses; 279 280 if (time != NULL) 281 memset (time, 0, sizeof *time); 282 283 statuses = (int *) obj->sysdep; 284 *status = statuses[pid]; 285 286 return 0; 287} 288