1 /* Copyright (C) 1993, 1997 Free Software Foundation, Inc.
2 This file is part of the GNU IO Library.
3 Written by Per Bothner <bothner@cygnus.com>.
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.
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.
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,
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. */
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 _IO_proc_open (fp, command, mode)
89 volatile int read_or_write;
90 volatile int parent_end, child_end;
93 if (_IO_file_is_open (fp))
95 if (_IO_pipe (pipe_fds) < 0)
99 parent_end = pipe_fds[0];
100 child_end = pipe_fds[1];
101 read_or_write = _IO_NO_WRITES;
105 parent_end = pipe_fds[1];
106 child_end = pipe_fds[0];
107 read_or_write = _IO_NO_READS;
109 ((_IO_proc_file *) fp)->pid = child_pid = _IO_fork ();
112 int child_std_end = mode[0] == 'r' ? 1 : 0;
113 _IO_close (parent_end);
114 if (child_end != child_std_end)
116 _IO_dup2 (child_end, child_std_end);
117 _IO_close (child_end);
119 /* POSIX.2: "popen() shall ensure that any streams from previous
120 popen() calls that remain open in the parent process are closed
121 in the new child process." */
122 while (proc_file_chain)
124 _IO_close (_IO_fileno ((_IO_FILE *) proc_file_chain));
125 proc_file_chain = proc_file_chain->next;
128 _IO_execl ("/bin/sh", "sh", "-c", command, (char *) 0);
131 _IO_close (child_end);
134 _IO_close (parent_end);
137 _IO_fileno (fp) = parent_end;
139 /* Link into proc_file_chain. */
140 ((_IO_proc_file *) fp)->next = proc_file_chain;
141 proc_file_chain = (_IO_proc_file *) fp;
143 _IO_mask_flags (fp, read_or_write, _IO_NO_READS|_IO_NO_WRITES);
145 #else /* !_IO_HAVE_SYS_WAIT */
151 _IO_popen (command, mode)
157 struct _IO_proc_file fpx;
164 new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE));
168 new_f->fpx.file.file._lock = &new_f->lock;
170 fp = (_IO_FILE*)&new_f->fpx;
172 _IO_JUMPS (fp) = &_IO_proc_jumps;
174 #if !_IO_UNIFIED_JUMPTABLES
175 ((struct _IO_FILE_plus *) fp)->vtable = NULL;
177 if (_IO_proc_open (fp, command, mode) != NULL)
184 strong_alias (_IO_popen, popen);
191 /* This is not name-space clean. FIXME! */
192 #if _IO_HAVE_SYS_WAIT
194 _IO_proc_file **ptr = &proc_file_chain;
198 /* Unlink from proc_file_chain. */
199 for ( ; *ptr != NULL; ptr = &(*ptr)->next)
201 if (*ptr == (_IO_proc_file *) fp)
209 if (status < 0 || _IO_close (_IO_fileno(fp)) < 0)
211 /* POSIX.2 Rationale: "Some historical implementations either block
212 or ignore the signals SIGINT, SIGQUIT, and SIGHUP while waiting
213 for the child process to terminate. Since this behavior is not
214 described in POSIX.2, such implementations are not conforming." */
217 wait_pid = _IO_waitpid (((_IO_proc_file *) fp)->pid, &wstatus, 0);
219 while (wait_pid == -1 && errno == EINTR);
223 #else /* !_IO_HAVE_SYS_WAIT */
228 struct _IO_jump_t _IO_proc_jumps = {
230 JUMP_INIT(finish, _IO_file_finish),
231 JUMP_INIT(overflow, _IO_file_overflow),
232 JUMP_INIT(underflow, _IO_file_underflow),
233 JUMP_INIT(uflow, _IO_default_uflow),
234 JUMP_INIT(pbackfail, _IO_default_pbackfail),
235 JUMP_INIT(xsputn, _IO_file_xsputn),
236 JUMP_INIT(xsgetn, _IO_default_xsgetn),
237 JUMP_INIT(seekoff, _IO_file_seekoff),
238 JUMP_INIT(seekpos, _IO_default_seekpos),
239 JUMP_INIT(setbuf, _IO_file_setbuf),
240 JUMP_INIT(sync, _IO_file_sync),
241 JUMP_INIT(doallocate, _IO_file_doallocate),
242 JUMP_INIT(read, _IO_file_read),
243 JUMP_INIT(write, _IO_file_write),
244 JUMP_INIT(seek, _IO_file_seek),
245 JUMP_INIT(close, _IO_proc_close),
246 JUMP_INIT(stat, _IO_file_stat)