libio/oldiopopen.c

   1 /* Copyright (C) 1998,99,2000 Free Software Foundation, Inc.
   2    This file is part of the GNU IO Library.
   3    Written by Per Bothner <bothner@cygnus.com>.
   4
   5    This library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU General Public License as
   7    published by the Free Software Foundation; either version 2, or (at
   8    your option) any later version.
   9
  10    This library is distributed in the hope that it will be useful, but
  11    WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this library; see the file COPYING.  If not, write to
  17    the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
  18    MA 02111-1307, USA.
  19
  20    As a special exception, if you link this library with files
  21    compiled with a GNU compiler to produce an executable, this does
  22    not cause the resulting executable to be covered by the GNU General
  23    Public License.  This exception does not however invalidate any
  24    other reasons why the executable file might be covered by the GNU
  25    General Public License.  */
  26
  27 #include <shlib-compat.h>
  28 #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1)
  29
  30 #define _IO_USE_OLD_IO_FILE
  31 #ifndef _POSIX_SOURCE
  32 # define _POSIX_SOURCE
  33 #endif
  34 #include "libioP.h"
  35 #if _IO_HAVE_SYS_WAIT
  36 #include <signal.h>
  37 #include <unistd.h>
  38 #ifdef __STDC__
  39 #include <stdlib.h>
  40 #endif
  41 #ifdef _LIBC
  42 # include <unistd.h>
  43 #endif
  44 #include <sys/types.h>
  45 #include <sys/wait.h>
  46
  47 #ifndef _IO_fork
  48 #ifdef _LIBC
  49 #define _IO_fork __vfork
  50 #else
  51 #define _IO_fork vfork /* defined in libiberty, if needed */
  52 #endif
  53 extern _IO_pid_t _IO_fork __P ((void));
  54 #endif
  55
  56 #endif /* _IO_HAVE_SYS_WAIT */
  57
  58 #ifndef _IO_pipe
  59 #ifdef _LIBC
  60 #define _IO_pipe __pipe
  61 #else
  62 #define _IO_pipe pipe
  63 #endif
  64 extern int _IO_pipe __P ((int des[2]));
  65 #endif
  66
  67 #ifndef _IO_dup2
  68 #ifdef _LIBC
  69 #define _IO_dup2 __dup2
  70 #else
  71 #define _IO_dup2 dup2
  72 #endif
  73 extern int _IO_dup2 __P ((int fd, int fd2));
  74 #endif
  75
  76 #ifndef _IO_waitpid
  77 #ifdef _LIBC
  78 #define _IO_waitpid __waitpid
  79 #else
  80 #define _IO_waitpid waitpid
  81 #endif
  82 #endif
  83
  84 #ifndef _IO_execl
  85 #define _IO_execl execl
  86 #endif
  87 #ifndef _IO__exit
  88 #define _IO__exit _exit
  89 #endif
  90
  91 #ifndef _IO_close
  92 #ifdef _LIBC
  93 #define _IO_close __close
  94 #else
  95 #define _IO_close close
  96 #endif
  97 #endif
  98
  99 struct _IO_proc_file
 100 {
 101   struct _IO_FILE_plus file;
 102   /* Following fields must match those in class procbuf (procbuf.h) */
 103   _IO_pid_t pid;
 104   struct _IO_proc_file *next;
 105 };
 106 typedef struct _IO_proc_file _IO_proc_file;
 107
 108 static struct _IO_proc_file *old_proc_file_chain;
 109
 110 _IO_FILE *
 111 _IO_old_proc_open (fp, command, mode)
 112      _IO_FILE *fp;
 113      const char *command;
 114      const char *mode;
 115 {
 116 #if _IO_HAVE_SYS_WAIT
 117   volatile int read_or_write;
 118   volatile int parent_end, child_end;
 119   int pipe_fds[2];
 120   _IO_pid_t child_pid;
 121   if (_IO_file_is_open (fp))
 122     return NULL;
 123   if (_IO_pipe (pipe_fds) < 0)
 124     return NULL;
 125   if (mode[0] == 'r' && mode[1] == '\0')
 126     {
 127       parent_end = pipe_fds[0];
 128       child_end = pipe_fds[1];
 129       read_or_write = _IO_NO_WRITES;
 130     }
 131   else if (mode[0] == 'w' && mode[1] == '\0')
 132     {
 133       parent_end = pipe_fds[1];
 134       child_end = pipe_fds[0];
 135       read_or_write = _IO_NO_READS;
 136     }
 137   else
 138     {
 139       __set_errno (EINVAL);
 140       return NULL;
 141     }
 142   ((_IO_proc_file *) fp)->pid = child_pid = _IO_fork ();
 143   if (child_pid == 0)
 144     {
 145       int child_std_end = mode[0] == 'r' ? 1 : 0;
 146       struct _IO_proc_file *p;
 147
 148       _IO_close (parent_end);
 149       if (child_end != child_std_end)
 150         {
 151           _IO_dup2 (child_end, child_std_end);
 152           _IO_close (child_end);
 153         }
 154       /* POSIX.2:  "popen() shall ensure that any streams from previous
 155          popen() calls that remain open in the parent process are closed
 156          in the new child process." */
 157       for (p = old_proc_file_chain; p; p = p->next)
 158         _IO_close (_IO_fileno ((_IO_FILE *) p));
 159
 160       _IO_execl ("/bin/sh", "sh", "-c", command, (char *) 0);
 161       _IO__exit (127);
 162     }
 163   _IO_close (child_end);
 164   if (child_pid < 0)
 165     {
 166       _IO_close (parent_end);
 167       return NULL;
 168     }
 169   _IO_fileno (fp) = parent_end;
 170
 171   /* Link into old_proc_file_chain. */
 172   ((_IO_proc_file *) fp)->next = old_proc_file_chain;
 173   old_proc_file_chain = (_IO_proc_file *) fp;
 174
 175   _IO_mask_flags (fp, read_or_write, _IO_NO_READS|_IO_NO_WRITES);
 176   return fp;
 177 #else /* !_IO_HAVE_SYS_WAIT */
 178   return NULL;
 179 #endif
 180 }
 181
 182 _IO_FILE *
 183 _IO_old_popen (command, mode)
 184      const char *command;
 185      const char *mode;
 186 {
 187   struct locked_FILE
 188   {
 189     struct _IO_proc_file fpx;
 190 #ifdef _IO_MTSAFE_IO
 191     _IO_lock_t lock;
 192 #endif
 193   } *new_f;
 194   _IO_FILE *fp;
 195
 196   new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE));
 197   if (new_f == NULL)
 198     return NULL;
 199 #ifdef _IO_MTSAFE_IO
 200   new_f->fpx.file.file._lock = &new_f->lock;
 201 #endif
 202   fp = &new_f->fpx.file.file;
 203   _IO_init (fp, 0);
 204   _IO_JUMPS (fp) = &_IO_old_proc_jumps;
 205   _IO_old_file_init (fp);
 206 #if  !_IO_UNIFIED_JUMPTABLES
 207   new_f->fpx.file.vtable = NULL;
 208 #endif
 209   if (_IO_old_proc_open (fp, command, mode) != NULL)
 210     return fp;
 211   _IO_un_link (fp);
 212   free (new_f);
 213   return NULL;
 214 }
 215
 216 int
 217 _IO_old_proc_close (fp)
 218      _IO_FILE *fp;
 219 {
 220   /* This is not name-space clean. FIXME! */
 221 #if _IO_HAVE_SYS_WAIT
 222   int wstatus;
 223   _IO_proc_file **ptr = &old_proc_file_chain;
 224   _IO_pid_t wait_pid;
 225   int status = -1;
 226
 227   /* Unlink from old_proc_file_chain. */
 228   for ( ; *ptr != NULL; ptr = &(*ptr)->next)
 229     {
 230       if (*ptr == (_IO_proc_file *) fp)
 231         {
 232           *ptr = (*ptr)->next;
 233           status = 0;
 234           break;
 235         }
 236     }
 237
 238   if (status < 0 || _IO_close (_IO_fileno(fp)) < 0)
 239     return -1;
 240   /* POSIX.2 Rationale:  "Some historical implementations either block
 241      or ignore the signals SIGINT, SIGQUIT, and SIGHUP while waiting
 242      for the child process to terminate.  Since this behavior is not
 243      described in POSIX.2, such implementations are not conforming." */
 244   do
 245     {
 246       wait_pid = _IO_waitpid (((_IO_proc_file *) fp)->pid, &wstatus, 0);
 247     }
 248   while (wait_pid == -1 && errno == EINTR);
 249   if (wait_pid == -1)
 250     return -1;
 251   return wstatus;
 252 #else /* !_IO_HAVE_SYS_WAIT */
 253   return -1;
 254 #endif
 255 }
 256
 257 struct _IO_jump_t _IO_old_proc_jumps = {
 258   JUMP_INIT_DUMMY,
 259   JUMP_INIT(finish, _IO_old_file_finish),
 260   JUMP_INIT(overflow, _IO_old_file_overflow),
 261   JUMP_INIT(underflow, _IO_old_file_underflow),
 262   JUMP_INIT(uflow, _IO_default_uflow),
 263   JUMP_INIT(pbackfail, _IO_default_pbackfail),
 264   JUMP_INIT(xsputn, _IO_old_file_xsputn),
 265   JUMP_INIT(xsgetn, _IO_default_xsgetn),
 266   JUMP_INIT(seekoff, _IO_old_file_seekoff),
 267   JUMP_INIT(seekpos, _IO_default_seekpos),
 268   JUMP_INIT(setbuf, _IO_old_file_setbuf),
 269   JUMP_INIT(sync, _IO_old_file_sync),
 270   JUMP_INIT(doallocate, _IO_file_doallocate),
 271   JUMP_INIT(read, _IO_file_read),
 272   JUMP_INIT(write, _IO_old_file_write),
 273   JUMP_INIT(seek, _IO_file_seek),
 274   JUMP_INIT(close, _IO_old_proc_close),
 275   JUMP_INIT(stat, _IO_file_stat),
 276   JUMP_INIT(showmanyc, _IO_default_showmanyc),
 277   JUMP_INIT(imbue, _IO_default_imbue)
 278 };
 279
 280 strong_alias (_IO_old_popen, __old_popen)
 281 compat_symbol (libc, _IO_old_popen, _IO_popen, GLIBC_2_0);
 282 compat_symbol (libc, __old_popen, popen, GLIBC_2_0);
 283 compat_symbol (libc, _IO_old_proc_open, _IO_proc_open, GLIBC_2_0);
 284 compat_symbol (libc, _IO_old_proc_close, _IO_proc_close, GLIBC_2_0);
 285
 286 #endif