2 Copyright (C) 1993 Free Software Foundation
4 This file is part of the GNU IO Library. This library is free
5 software; you can redistribute it and/or modify it under the
6 terms of the GNU General Public License as published by the
7 Free Software Foundation; either version 2, or (at your option)
10 This 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
13 GNU General Public License for more details.
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 the Free
17 Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
19 As a special exception, if you link this library with files
20 compiled with a GNU compiler to produce an executable, this does not cause
21 the resulting executable to be covered by the GNU General Public License.
22 This exception does not however invalidate any other reasons why
23 the executable file might be covered by the GNU General Public License. */
25 /* written by Per Bothner (bothner@cygnus.com) */
28 # define _POSIX_SOURCE
40 #include <sys/types.h>
44 #define _IO_fork vfork /* defined in libiberty, if needed */
45 extern _IO_pid_t _IO_fork
__P ((void));
48 #endif /* _IO_HAVE_SYS_WAIT */
52 extern int _IO_pipe
__P ((int des
[2]));
57 extern int _IO_dup2
__P ((int fd
, int fd2
));
61 #define _IO_waitpid waitpid
65 #define _IO_execl execl
68 #define _IO__exit _exit
73 struct _IO_FILE_plus file
;
74 /* Following fields must match those in class procbuf (procbuf.h) */
76 struct _IO_proc_file
*next
;
78 typedef struct _IO_proc_file _IO_proc_file
;
80 static struct _IO_proc_file
*proc_file_chain
= NULL
;
83 DEFUN(_IO_proc_open
, (fp
, command
, mode
),
84 _IO_FILE
* fp AND
const char *command AND
const char *mode
)
87 volatile int read_or_write
;
88 volatile int parent_end
, child_end
;
91 if (_IO_file_is_open(fp
))
93 if (_IO_pipe(pipe_fds
) < 0)
97 parent_end
= pipe_fds
[0];
98 child_end
= pipe_fds
[1];
99 read_or_write
= _IO_NO_WRITES
;
103 parent_end
= pipe_fds
[1];
104 child_end
= pipe_fds
[0];
105 read_or_write
= _IO_NO_READS
;
107 ((_IO_proc_file
*)fp
)->pid
= child_pid
= _IO_fork();
110 int child_std_end
= mode
[0] == 'r' ? 1 : 0;
111 _IO_close(parent_end
);
112 if (child_end
!= child_std_end
)
114 _IO_dup2(child_end
, child_std_end
);
115 _IO_close(child_end
);
117 /* Posix.2: "popen() shall ensure that any streams from previous
118 popen() calls that remain open in the parent process are closed
119 in the new child process." */
120 while (proc_file_chain
)
122 _IO_close (_IO_fileno ((_IO_FILE
*) proc_file_chain
));
123 proc_file_chain
= proc_file_chain
->next
;
126 _IO_execl("/bin/sh", "sh", "-c", command
, NULL
);
129 _IO_close(child_end
);
132 _IO_close(parent_end
);
135 _IO_fileno(fp
) = parent_end
;
137 /* Link into proc_file_chain. */
138 ((_IO_proc_file
*)fp
)->next
= proc_file_chain
;
139 proc_file_chain
= (_IO_proc_file
*)fp
;
141 _IO_mask_flags (fp
, read_or_write
, _IO_NO_READS
|_IO_NO_WRITES
);
143 #else /* !_IO_HAVE_SYS_WAIT */
149 DEFUN(_IO_popen
, (command
, mode
),
150 const char *command AND
const char *mode
)
152 _IO_proc_file
*fpx
= (_IO_proc_file
*)malloc(sizeof(_IO_proc_file
));
153 _IO_FILE
*fp
= (_IO_FILE
*)fpx
;
157 _IO_JUMPS(fp
) = &_IO_proc_jumps
;
159 #if !_IO_UNIFIED_JUMPTABLES
160 ((struct _IO_FILE_plus
*)fp
)->vtable
= NULL
;
162 if (_IO_proc_open (fp
, command
, mode
) != NULL
)
168 strong_alias (_IO_popen
, popen
);
171 DEFUN(_IO_proc_close
, (fp
),
174 /* This is not name-space clean. FIXME! */
175 #if _IO_HAVE_SYS_WAIT
177 _IO_proc_file
**ptr
= &proc_file_chain
;
181 /* Unlink from proc_file_chain. */
182 for ( ; *ptr
!= NULL
; ptr
= &(*ptr
)->next
)
184 if (*ptr
== (_IO_proc_file
*)fp
)
192 if (status
< 0 || _IO_close(_IO_fileno(fp
)) < 0)
194 /* POSIX.2 Rationale: "Some historical implementations either block
195 or ignore the signals SIGINT, SIGQUIT, and SIGHUP while waiting
196 for the child process to terminate. Since this behavior is not
197 described in POSIX.2, such implementations are not conforming." */
200 wait_pid
= _IO_waitpid (((_IO_proc_file
*)fp
)->pid
, &wstatus
, 0);
201 } while (wait_pid
== -1 && errno
== EINTR
);
205 #else /* !_IO_HAVE_SYS_WAIT */
210 struct _IO_jump_t _IO_proc_jumps
= {
212 JUMP_INIT(finish
, _IO_file_finish
),
213 JUMP_INIT(overflow
, _IO_file_overflow
),
214 JUMP_INIT(underflow
, _IO_file_underflow
),
215 JUMP_INIT(uflow
, _IO_default_uflow
),
216 JUMP_INIT(pbackfail
, _IO_default_pbackfail
),
217 JUMP_INIT(xsputn
, _IO_file_xsputn
),
218 JUMP_INIT(xsgetn
, _IO_default_xsgetn
),
219 JUMP_INIT(seekoff
, _IO_file_seekoff
),
220 JUMP_INIT(seekpos
, _IO_default_seekpos
),
221 JUMP_INIT(setbuf
, _IO_file_setbuf
),
222 JUMP_INIT(sync
, _IO_file_sync
),
223 JUMP_INIT(doallocate
, _IO_file_doallocate
),
224 JUMP_INIT(read
, _IO_file_read
),
225 JUMP_INIT(write
, _IO_file_write
),
226 JUMP_INIT(seek
, _IO_file_seek
),
227 JUMP_INIT(close
, _IO_proc_close
),
228 JUMP_INIT(stat
, _IO_file_stat
)