| 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) 1996-2019 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_STDLIB_H |
| 29 | #include <stdlib.h> |
| 30 | #endif |
| 31 | #include <string.h> |
| 32 | #include <fcntl.h> |
| 33 | #include <unistd.h> |
| 34 | #include <sys/stat.h> |
| 35 | #include <process.h> |
| 36 | |
| 37 | /* Use ECHILD if available, otherwise use EINVAL. */ |
| 38 | #ifdef ECHILD |
| 39 | #define PWAIT_ERROR ECHILD |
| 40 | #else |
| 41 | #define PWAIT_ERROR EINVAL |
| 42 | #endif |
| 43 | |
| 44 | static int pex_djgpp_open_read (struct pex_obj *, const char *, int); |
| 45 | static int pex_djgpp_open_write (struct pex_obj *, const char *, int, int); |
| 46 | static pid_t pex_djgpp_exec_child (struct pex_obj *, int, const char *, |
| 47 | char * const *, char * const *, |
| 48 | int, int, int, int, |
| 49 | const char **, int *); |
| 50 | static int pex_djgpp_close (struct pex_obj *, int); |
| 51 | static pid_t pex_djgpp_wait (struct pex_obj *, pid_t, int *, struct pex_time *, |
| 52 | int, const char **, int *); |
| 53 | |
| 54 | /* The list of functions we pass to the common routines. */ |
| 55 | |
| 56 | const 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 | |
| 71 | struct pex_obj * |
| 72 | pex_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 | |
| 81 | static int |
| 82 | pex_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 | |
| 90 | static int |
| 91 | pex_djgpp_open_write (struct pex_obj *obj ATTRIBUTE_UNUSED, |
| 92 | const char *name, int binary, int append) |
| 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 | if (append) |
| 97 | return -1; |
| 98 | return open (name, |
| 99 | (O_WRONLY | O_CREAT | O_TRUNC |
| 100 | | (binary ? O_BINARY : O_TEXT)), |
| 101 | S_IRUSR | S_IWUSR); |
| 102 | } |
| 103 | |
| 104 | /* Close a file. */ |
| 105 | |
| 106 | static int |
| 107 | pex_djgpp_close (struct pex_obj *obj ATTRIBUTE_UNUSED, int fd) |
| 108 | { |
| 109 | return close (fd); |
| 110 | } |
| 111 | |
| 112 | /* Execute a child. */ |
| 113 | |
| 114 | static pid_t |
| 115 | pex_djgpp_exec_child (struct pex_obj *obj, int flags, const char *executable, |
| 116 | char * const * argv, char * const * env, |
| 117 | int in, int out, int errdes, |
| 118 | int toclose ATTRIBUTE_UNUSED, const char **errmsg, |
| 119 | int *err) |
| 120 | { |
| 121 | int org_in, org_out, org_errdes; |
| 122 | int status; |
| 123 | int *statuses; |
| 124 | |
| 125 | org_in = -1; |
| 126 | org_out = -1; |
| 127 | org_errdes = -1; |
| 128 | |
| 129 | if (in != STDIN_FILE_NO) |
| 130 | { |
| 131 | org_in = dup (STDIN_FILE_NO); |
| 132 | if (org_in < 0) |
| 133 | { |
| 134 | *err = errno; |
| 135 | *errmsg = "dup"; |
| 136 | return (pid_t) -1; |
| 137 | } |
| 138 | if (dup2 (in, STDIN_FILE_NO) < 0) |
| 139 | { |
| 140 | *err = errno; |
| 141 | *errmsg = "dup2"; |
| 142 | return (pid_t) -1; |
| 143 | } |
| 144 | if (close (in) < 0) |
| 145 | { |
| 146 | *err = errno; |
| 147 | *errmsg = "close"; |
| 148 | return (pid_t) -1; |
| 149 | } |
| 150 | } |
| 151 | |
| 152 | if (out != STDOUT_FILE_NO) |
| 153 | { |
| 154 | org_out = dup (STDOUT_FILE_NO); |
| 155 | if (org_out < 0) |
| 156 | { |
| 157 | *err = errno; |
| 158 | *errmsg = "dup"; |
| 159 | return (pid_t) -1; |
| 160 | } |
| 161 | if (dup2 (out, STDOUT_FILE_NO) < 0) |
| 162 | { |
| 163 | *err = errno; |
| 164 | *errmsg = "dup2"; |
| 165 | return (pid_t) -1; |
| 166 | } |
| 167 | if (close (out) < 0) |
| 168 | { |
| 169 | *err = errno; |
| 170 | *errmsg = "close"; |
| 171 | return (pid_t) -1; |
| 172 | } |
| 173 | } |
| 174 | |
| 175 | if (errdes != STDERR_FILE_NO |
| 176 | || (flags & PEX_STDERR_TO_STDOUT) != 0) |
| 177 | { |
| 178 | org_errdes = dup (STDERR_FILE_NO); |
| 179 | if (org_errdes < 0) |
| 180 | { |
| 181 | *err = errno; |
| 182 | *errmsg = "dup"; |
| 183 | return (pid_t) -1; |
| 184 | } |
| 185 | if (dup2 ((flags & PEX_STDERR_TO_STDOUT) != 0 ? STDOUT_FILE_NO : errdes, |
| 186 | STDERR_FILE_NO) < 0) |
| 187 | { |
| 188 | *err = errno; |
| 189 | *errmsg = "dup2"; |
| 190 | return (pid_t) -1; |
| 191 | } |
| 192 | if (errdes != STDERR_FILE_NO) |
| 193 | { |
| 194 | if (close (errdes) < 0) |
| 195 | { |
| 196 | *err = errno; |
| 197 | *errmsg = "close"; |
| 198 | return (pid_t) -1; |
| 199 | } |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | if (env) |
| 204 | status = (((flags & PEX_SEARCH) != 0 ? spawnvpe : spawnve) |
| 205 | (P_WAIT, executable, argv, env)); |
| 206 | else |
| 207 | status = (((flags & PEX_SEARCH) != 0 ? spawnvp : spawnv) |
| 208 | (P_WAIT, executable, argv)); |
| 209 | |
| 210 | if (status == -1) |
| 211 | { |
| 212 | *err = errno; |
| 213 | *errmsg = ((flags & PEX_SEARCH) != 0) ? "spawnvp" : "spawnv"; |
| 214 | } |
| 215 | |
| 216 | if (in != STDIN_FILE_NO) |
| 217 | { |
| 218 | if (dup2 (org_in, STDIN_FILE_NO) < 0) |
| 219 | { |
| 220 | *err = errno; |
| 221 | *errmsg = "dup2"; |
| 222 | return (pid_t) -1; |
| 223 | } |
| 224 | if (close (org_in) < 0) |
| 225 | { |
| 226 | *err = errno; |
| 227 | *errmsg = "close"; |
| 228 | return (pid_t) -1; |
| 229 | } |
| 230 | } |
| 231 | |
| 232 | if (out != STDOUT_FILE_NO) |
| 233 | { |
| 234 | if (dup2 (org_out, STDOUT_FILE_NO) < 0) |
| 235 | { |
| 236 | *err = errno; |
| 237 | *errmsg = "dup2"; |
| 238 | return (pid_t) -1; |
| 239 | } |
| 240 | if (close (org_out) < 0) |
| 241 | { |
| 242 | *err = errno; |
| 243 | *errmsg = "close"; |
| 244 | return (pid_t) -1; |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | if (errdes != STDERR_FILE_NO |
| 249 | || (flags & PEX_STDERR_TO_STDOUT) != 0) |
| 250 | { |
| 251 | if (dup2 (org_errdes, STDERR_FILE_NO) < 0) |
| 252 | { |
| 253 | *err = errno; |
| 254 | *errmsg = "dup2"; |
| 255 | return (pid_t) -1; |
| 256 | } |
| 257 | if (close (org_errdes) < 0) |
| 258 | { |
| 259 | *err = errno; |
| 260 | *errmsg = "close"; |
| 261 | return (pid_t) -1; |
| 262 | } |
| 263 | } |
| 264 | |
| 265 | /* Save the exit status for later. When we are called, obj->count |
| 266 | is the number of children which have executed before this |
| 267 | one. */ |
| 268 | statuses = (int *) obj->sysdep; |
| 269 | statuses = XRESIZEVEC (int, statuses, obj->count + 1); |
| 270 | statuses[obj->count] = status; |
| 271 | obj->sysdep = (void *) statuses; |
| 272 | |
| 273 | return (pid_t) obj->count; |
| 274 | } |
| 275 | |
| 276 | /* Wait for a child process to complete. Actually the child process |
| 277 | has already completed, and we just need to return the exit |
| 278 | status. */ |
| 279 | |
| 280 | static pid_t |
| 281 | pex_djgpp_wait (struct pex_obj *obj, pid_t pid, int *status, |
| 282 | struct pex_time *time, int done ATTRIBUTE_UNUSED, |
| 283 | const char **errmsg ATTRIBUTE_UNUSED, |
| 284 | int *err ATTRIBUTE_UNUSED) |
| 285 | { |
| 286 | int *statuses; |
| 287 | |
| 288 | if (time != NULL) |
| 289 | memset (time, 0, sizeof *time); |
| 290 | |
| 291 | statuses = (int *) obj->sysdep; |
| 292 | *status = statuses[pid]; |
| 293 | |
| 294 | return 0; |
| 295 | } |