lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | /* Copyright (C) 1998-2015 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. |
| 3 | Written by Per Bothner <bothner@cygnus.com>. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library; if not, see |
| 17 | <http://www.gnu.org/licenses/>. |
| 18 | |
| 19 | As a special exception, if you link the code in this file with |
| 20 | files compiled with a GNU compiler to produce an executable, |
| 21 | that does not cause the resulting executable to be covered by |
| 22 | the GNU Lesser General Public License. This exception does not |
| 23 | however invalidate any other reasons why the executable file |
| 24 | might be covered by the GNU Lesser General Public License. |
| 25 | This exception applies to code released by its copyright holders |
| 26 | in files containing the exception. */ |
| 27 | |
| 28 | #define _IO_USE_OLD_IO_FILE |
| 29 | #ifndef _POSIX_SOURCE |
| 30 | # define _POSIX_SOURCE |
| 31 | #endif |
| 32 | #include "libioP.h" |
| 33 | #include <signal.h> |
| 34 | #include <unistd.h> |
| 35 | #include <stdlib.h> |
| 36 | #ifdef _LIBC |
| 37 | # include <unistd.h> |
| 38 | #endif |
| 39 | #include <sys/types.h> |
| 40 | #include <sys/wait.h> |
| 41 | |
| 42 | #ifndef _IO_fork |
| 43 | #ifdef _LIBC |
| 44 | #define _IO_fork __fork |
| 45 | #else |
| 46 | #define _IO_fork fork /* defined in libiberty, if needed */ |
| 47 | #endif |
| 48 | extern _IO_pid_t _IO_fork (void) __THROW; |
| 49 | #endif |
| 50 | |
| 51 | #include <shlib-compat.h> |
| 52 | #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1) |
| 53 | |
| 54 | #ifndef _IO_pipe |
| 55 | #ifdef _LIBC |
| 56 | #define _IO_pipe __pipe |
| 57 | #else |
| 58 | #define _IO_pipe pipe |
| 59 | #endif |
| 60 | extern int _IO_pipe (int des[2]) __THROW; |
| 61 | #endif |
| 62 | |
| 63 | #ifndef _IO_dup2 |
| 64 | #ifdef _LIBC |
| 65 | #define _IO_dup2 __dup2 |
| 66 | #else |
| 67 | #define _IO_dup2 dup2 |
| 68 | #endif |
| 69 | extern int _IO_dup2 (int fd, int fd2) __THROW; |
| 70 | #endif |
| 71 | |
| 72 | #ifndef _IO_waitpid |
| 73 | #ifdef _LIBC |
| 74 | #define _IO_waitpid __waitpid |
| 75 | #else |
| 76 | #define _IO_waitpid waitpid |
| 77 | #endif |
| 78 | #endif |
| 79 | |
| 80 | #ifndef _IO_execl |
| 81 | #define _IO_execl execl |
| 82 | #endif |
| 83 | #ifndef _IO__exit |
| 84 | #define _IO__exit _exit |
| 85 | #endif |
| 86 | |
| 87 | #ifndef _IO_close |
| 88 | #ifdef _LIBC |
| 89 | #define _IO_close __close |
| 90 | #else |
| 91 | #define _IO_close close |
| 92 | #endif |
| 93 | #endif |
| 94 | |
| 95 | struct _IO_proc_file |
| 96 | { |
| 97 | struct _IO_FILE_complete_plus file; |
| 98 | /* Following fields must match those in class procbuf (procbuf.h) */ |
| 99 | _IO_pid_t pid; |
| 100 | struct _IO_proc_file *next; |
| 101 | }; |
| 102 | typedef struct _IO_proc_file _IO_proc_file; |
| 103 | |
| 104 | static struct _IO_proc_file *old_proc_file_chain; |
| 105 | |
| 106 | #ifdef _IO_MTSAFE_IO |
| 107 | static _IO_lock_t proc_file_chain_lock = _IO_lock_initializer; |
| 108 | |
| 109 | static void |
| 110 | unlock (void *not_used) |
| 111 | { |
| 112 | _IO_lock_unlock (proc_file_chain_lock); |
| 113 | } |
| 114 | #endif |
| 115 | |
| 116 | _IO_FILE * |
| 117 | attribute_compat_text_section |
| 118 | _IO_old_proc_open (fp, command, mode) |
| 119 | _IO_FILE *fp; |
| 120 | const char *command; |
| 121 | const char *mode; |
| 122 | { |
| 123 | volatile int read_or_write; |
| 124 | volatile int parent_end, child_end; |
| 125 | int pipe_fds[2]; |
| 126 | _IO_pid_t child_pid; |
| 127 | if (_IO_file_is_open (fp)) |
| 128 | return NULL; |
| 129 | if (_IO_pipe (pipe_fds) < 0) |
| 130 | return NULL; |
| 131 | if (mode[0] == 'r' && mode[1] == '\0') |
| 132 | { |
| 133 | parent_end = pipe_fds[0]; |
| 134 | child_end = pipe_fds[1]; |
| 135 | read_or_write = _IO_NO_WRITES; |
| 136 | } |
| 137 | else if (mode[0] == 'w' && mode[1] == '\0') |
| 138 | { |
| 139 | parent_end = pipe_fds[1]; |
| 140 | child_end = pipe_fds[0]; |
| 141 | read_or_write = _IO_NO_READS; |
| 142 | } |
| 143 | else |
| 144 | { |
| 145 | _IO_close (pipe_fds[0]); |
| 146 | _IO_close (pipe_fds[1]); |
| 147 | __set_errno (EINVAL); |
| 148 | return NULL; |
| 149 | } |
| 150 | ((_IO_proc_file *) fp)->pid = child_pid = _IO_fork (); |
| 151 | if (child_pid == 0) |
| 152 | { |
| 153 | int child_std_end = mode[0] == 'r' ? 1 : 0; |
| 154 | struct _IO_proc_file *p; |
| 155 | |
| 156 | _IO_close (parent_end); |
| 157 | if (child_end != child_std_end) |
| 158 | { |
| 159 | _IO_dup2 (child_end, child_std_end); |
| 160 | _IO_close (child_end); |
| 161 | } |
| 162 | /* POSIX.2: "popen() shall ensure that any streams from previous |
| 163 | popen() calls that remain open in the parent process are closed |
| 164 | in the new child process." */ |
| 165 | for (p = old_proc_file_chain; p; p = p->next) |
| 166 | _IO_close (_IO_fileno ((_IO_FILE *) p)); |
| 167 | |
| 168 | _IO_execl ("/bin/sh", "sh", "-c", command, (char *) 0); |
| 169 | _IO__exit (127); |
| 170 | } |
| 171 | _IO_close (child_end); |
| 172 | if (child_pid < 0) |
| 173 | { |
| 174 | _IO_close (parent_end); |
| 175 | return NULL; |
| 176 | } |
| 177 | _IO_fileno (fp) = parent_end; |
| 178 | |
| 179 | /* Link into old_proc_file_chain. */ |
| 180 | #ifdef _IO_MTSAFE_IO |
| 181 | _IO_cleanup_region_start_noarg (unlock); |
| 182 | _IO_lock_lock (proc_file_chain_lock); |
| 183 | #endif |
| 184 | ((_IO_proc_file *) fp)->next = old_proc_file_chain; |
| 185 | old_proc_file_chain = (_IO_proc_file *) fp; |
| 186 | #ifdef _IO_MTSAFE_IO |
| 187 | _IO_lock_unlock (proc_file_chain_lock); |
| 188 | _IO_cleanup_region_end (0); |
| 189 | #endif |
| 190 | |
| 191 | _IO_mask_flags (fp, read_or_write, _IO_NO_READS|_IO_NO_WRITES); |
| 192 | return fp; |
| 193 | } |
| 194 | |
| 195 | _IO_FILE * |
| 196 | attribute_compat_text_section |
| 197 | _IO_old_popen (command, mode) |
| 198 | const char *command; |
| 199 | const char *mode; |
| 200 | { |
| 201 | struct locked_FILE |
| 202 | { |
| 203 | struct _IO_proc_file fpx; |
| 204 | #ifdef _IO_MTSAFE_IO |
| 205 | _IO_lock_t lock; |
| 206 | #endif |
| 207 | } *new_f; |
| 208 | _IO_FILE *fp; |
| 209 | |
| 210 | new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE)); |
| 211 | if (new_f == NULL) |
| 212 | return NULL; |
| 213 | #ifdef _IO_MTSAFE_IO |
| 214 | new_f->fpx.file.file._file._lock = &new_f->lock; |
| 215 | #endif |
| 216 | fp = &new_f->fpx.file.file._file; |
| 217 | _IO_old_init (fp, 0); |
| 218 | _IO_JUMPS_FILE_plus (&new_f->fpx.file) = &_IO_old_proc_jumps; |
| 219 | _IO_old_file_init ((struct _IO_FILE_plus *) &new_f->fpx.file); |
| 220 | #if !_IO_UNIFIED_JUMPTABLES |
| 221 | new_f->fpx.file.vtable = NULL; |
| 222 | #endif |
| 223 | if (_IO_old_proc_open (fp, command, mode) != NULL) |
| 224 | return fp; |
| 225 | _IO_un_link ((struct _IO_FILE_plus *) &new_f->fpx.file); |
| 226 | free (new_f); |
| 227 | return NULL; |
| 228 | } |
| 229 | |
| 230 | int |
| 231 | attribute_compat_text_section |
| 232 | _IO_old_proc_close (fp) |
| 233 | _IO_FILE *fp; |
| 234 | { |
| 235 | /* This is not name-space clean. FIXME! */ |
| 236 | int wstatus; |
| 237 | _IO_proc_file **ptr = &old_proc_file_chain; |
| 238 | _IO_pid_t wait_pid; |
| 239 | int status = -1; |
| 240 | |
| 241 | /* Unlink from old_proc_file_chain. */ |
| 242 | #ifdef _IO_MTSAFE_IO |
| 243 | _IO_cleanup_region_start_noarg (unlock); |
| 244 | _IO_lock_lock (proc_file_chain_lock); |
| 245 | #endif |
| 246 | for ( ; *ptr != NULL; ptr = &(*ptr)->next) |
| 247 | { |
| 248 | if (*ptr == (_IO_proc_file *) fp) |
| 249 | { |
| 250 | *ptr = (*ptr)->next; |
| 251 | status = 0; |
| 252 | break; |
| 253 | } |
| 254 | } |
| 255 | #ifdef _IO_MTSAFE_IO |
| 256 | _IO_lock_unlock (proc_file_chain_lock); |
| 257 | _IO_cleanup_region_end (0); |
| 258 | #endif |
| 259 | |
| 260 | if (status < 0 || _IO_close (_IO_fileno(fp)) < 0) |
| 261 | return -1; |
| 262 | /* POSIX.2 Rationale: "Some historical implementations either block |
| 263 | or ignore the signals SIGINT, SIGQUIT, and SIGHUP while waiting |
| 264 | for the child process to terminate. Since this behavior is not |
| 265 | described in POSIX.2, such implementations are not conforming." */ |
| 266 | do |
| 267 | { |
| 268 | wait_pid = _IO_waitpid (((_IO_proc_file *) fp)->pid, &wstatus, 0); |
| 269 | } |
| 270 | while (wait_pid == -1 && errno == EINTR); |
| 271 | if (wait_pid == -1) |
| 272 | return -1; |
| 273 | return wstatus; |
| 274 | } |
| 275 | |
| 276 | const struct _IO_jump_t _IO_old_proc_jumps = { |
| 277 | JUMP_INIT_DUMMY, |
| 278 | JUMP_INIT(finish, _IO_old_file_finish), |
| 279 | JUMP_INIT(overflow, _IO_old_file_overflow), |
| 280 | JUMP_INIT(underflow, _IO_old_file_underflow), |
| 281 | JUMP_INIT(uflow, _IO_default_uflow), |
| 282 | JUMP_INIT(pbackfail, _IO_default_pbackfail), |
| 283 | JUMP_INIT(xsputn, _IO_old_file_xsputn), |
| 284 | JUMP_INIT(xsgetn, _IO_default_xsgetn), |
| 285 | JUMP_INIT(seekoff, _IO_old_file_seekoff), |
| 286 | JUMP_INIT(seekpos, _IO_default_seekpos), |
| 287 | JUMP_INIT(setbuf, _IO_old_file_setbuf), |
| 288 | JUMP_INIT(sync, _IO_old_file_sync), |
| 289 | JUMP_INIT(doallocate, _IO_file_doallocate), |
| 290 | JUMP_INIT(read, _IO_file_read), |
| 291 | JUMP_INIT(write, _IO_old_file_write), |
| 292 | JUMP_INIT(seek, _IO_file_seek), |
| 293 | JUMP_INIT(close, _IO_old_proc_close), |
| 294 | JUMP_INIT(stat, _IO_file_stat), |
| 295 | JUMP_INIT(showmanyc, _IO_default_showmanyc), |
| 296 | JUMP_INIT(imbue, _IO_default_imbue) |
| 297 | }; |
| 298 | |
| 299 | strong_alias (_IO_old_popen, __old_popen) |
| 300 | compat_symbol (libc, _IO_old_popen, _IO_popen, GLIBC_2_0); |
| 301 | compat_symbol (libc, __old_popen, popen, GLIBC_2_0); |
| 302 | compat_symbol (libc, _IO_old_proc_open, _IO_proc_open, GLIBC_2_0); |
| 303 | compat_symbol (libc, _IO_old_proc_close, _IO_proc_close, GLIBC_2_0); |
| 304 | |
| 305 | #endif |