249 lines
6.3 KiB
C
249 lines
6.3 KiB
C
/* Copyright (C) 1993, 1997 Free Software Foundation, Inc.
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This file is part of the GNU IO Library.
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Written by Per Bothner <bothner@cygnus.com>.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2, or (at
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your option) any later version.
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This library is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this library; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, USA.
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As a special exception, if you link this library with files
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compiled with a GNU compiler to produce an executable, this does
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not cause the resulting executable to be covered by the GNU General
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Public License. This exception does not however invalidate any
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other reasons why the executable file might be covered by the GNU
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General Public License. */
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#include "libioP.h"
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#if _IO_HAVE_SYS_WAIT
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#include <signal.h>
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#include <unistd.h>
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#ifdef __STDC__
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#include <stdlib.h>
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#endif
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#ifdef _LIBC
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# include <unistd.h>
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#endif
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#include <sys/types.h>
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#include <sys/wait.h>
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#ifndef _IO_fork
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#define _IO_fork vfork /* defined in libiberty, if needed */
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extern _IO_pid_t _IO_fork __P ((void));
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#endif
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#endif /* _IO_HAVE_SYS_WAIT */
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#ifndef _IO_pipe
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#define _IO_pipe pipe
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extern int _IO_pipe __P ((int des[2]));
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#endif
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#ifndef _IO_dup2
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#define _IO_dup2 dup2
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extern int _IO_dup2 __P ((int fd, int fd2));
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#endif
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#ifndef _IO_waitpid
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#define _IO_waitpid waitpid
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#endif
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#ifndef _IO_execl
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#define _IO_execl execl
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#endif
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#ifndef _IO__exit
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#define _IO__exit _exit
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#endif
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#ifndef _IO_close
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#define _IO_close close
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#endif
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struct _IO_proc_file
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{
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struct _IO_FILE_plus file;
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/* Following fields must match those in class procbuf (procbuf.h) */
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_IO_pid_t pid;
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struct _IO_proc_file *next;
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};
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typedef struct _IO_proc_file _IO_proc_file;
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static struct _IO_proc_file *proc_file_chain = NULL;
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_IO_FILE *
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_IO_proc_open (fp, command, mode)
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_IO_FILE *fp;
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const char *command;
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const char *mode;
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{
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#if _IO_HAVE_SYS_WAIT
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volatile int read_or_write;
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volatile int parent_end, child_end;
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int pipe_fds[2];
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_IO_pid_t child_pid;
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if (_IO_file_is_open (fp))
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return NULL;
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if (_IO_pipe (pipe_fds) < 0)
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return NULL;
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if (mode[0] == 'r')
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{
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parent_end = pipe_fds[0];
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child_end = pipe_fds[1];
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read_or_write = _IO_NO_WRITES;
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}
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else
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{
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parent_end = pipe_fds[1];
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child_end = pipe_fds[0];
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read_or_write = _IO_NO_READS;
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}
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((_IO_proc_file *) fp)->pid = child_pid = _IO_fork ();
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if (child_pid == 0)
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{
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int child_std_end = mode[0] == 'r' ? 1 : 0;
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_IO_close (parent_end);
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if (child_end != child_std_end)
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{
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_IO_dup2 (child_end, child_std_end);
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_IO_close (child_end);
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}
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/* POSIX.2: "popen() shall ensure that any streams from previous
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popen() calls that remain open in the parent process are closed
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in the new child process." */
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while (proc_file_chain)
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{
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_IO_close (_IO_fileno ((_IO_FILE *) proc_file_chain));
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proc_file_chain = proc_file_chain->next;
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}
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_IO_execl ("/bin/sh", "sh", "-c", command, (char *) 0);
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_IO__exit (127);
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}
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_IO_close (child_end);
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if (child_pid < 0)
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{
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_IO_close (parent_end);
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return NULL;
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}
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_IO_fileno (fp) = parent_end;
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/* Link into proc_file_chain. */
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((_IO_proc_file *) fp)->next = proc_file_chain;
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proc_file_chain = (_IO_proc_file *) fp;
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_IO_mask_flags (fp, read_or_write, _IO_NO_READS|_IO_NO_WRITES);
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return fp;
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#else /* !_IO_HAVE_SYS_WAIT */
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return NULL;
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#endif
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}
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_IO_FILE *
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_IO_popen (command, mode)
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const char *command;
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const char *mode;
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{
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struct locked_FILE
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{
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struct _IO_proc_file fpx;
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#ifdef _IO_MTSAFE_IO
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_IO_lock_t lock;
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#endif
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} *new_f;
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_IO_FILE *fp;
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new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE));
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if (new_f == NULL)
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return NULL;
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#ifdef _IO_MTSAFE_IO
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new_f->fpx.file.file._lock = &new_f->lock;
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#endif
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fp = (_IO_FILE*)&new_f->fpx;
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_IO_init (fp, 0);
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_IO_JUMPS (fp) = &_IO_proc_jumps;
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_IO_file_init (fp);
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#if !_IO_UNIFIED_JUMPTABLES
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((struct _IO_FILE_plus *) fp)->vtable = NULL;
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#endif
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if (_IO_proc_open (fp, command, mode) != NULL)
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return fp;
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free (new_f);
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return NULL;
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}
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#ifdef strong_alias
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strong_alias (_IO_popen, popen);
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#endif
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int
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_IO_proc_close (fp)
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_IO_FILE *fp;
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{
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/* This is not name-space clean. FIXME! */
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#if _IO_HAVE_SYS_WAIT
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int wstatus;
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_IO_proc_file **ptr = &proc_file_chain;
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_IO_pid_t wait_pid;
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int status = -1;
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/* Unlink from proc_file_chain. */
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for ( ; *ptr != NULL; ptr = &(*ptr)->next)
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{
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if (*ptr == (_IO_proc_file *) fp)
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{
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*ptr = (*ptr)->next;
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status = 0;
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break;
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}
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}
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if (status < 0 || _IO_close (_IO_fileno(fp)) < 0)
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return -1;
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/* POSIX.2 Rationale: "Some historical implementations either block
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or ignore the signals SIGINT, SIGQUIT, and SIGHUP while waiting
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for the child process to terminate. Since this behavior is not
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described in POSIX.2, such implementations are not conforming." */
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do
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{
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wait_pid = _IO_waitpid (((_IO_proc_file *) fp)->pid, &wstatus, 0);
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}
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while (wait_pid == -1 && errno == EINTR);
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if (wait_pid == -1)
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return -1;
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return wstatus;
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#else /* !_IO_HAVE_SYS_WAIT */
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return -1;
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#endif
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}
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struct _IO_jump_t _IO_proc_jumps = {
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JUMP_INIT_DUMMY,
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JUMP_INIT(finish, _IO_file_finish),
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JUMP_INIT(overflow, _IO_file_overflow),
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JUMP_INIT(underflow, _IO_file_underflow),
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JUMP_INIT(uflow, _IO_default_uflow),
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JUMP_INIT(pbackfail, _IO_default_pbackfail),
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JUMP_INIT(xsputn, _IO_file_xsputn),
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JUMP_INIT(xsgetn, _IO_default_xsgetn),
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JUMP_INIT(seekoff, _IO_file_seekoff),
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JUMP_INIT(seekpos, _IO_default_seekpos),
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JUMP_INIT(setbuf, _IO_file_setbuf),
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JUMP_INIT(sync, _IO_file_sync),
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JUMP_INIT(doallocate, _IO_file_doallocate),
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JUMP_INIT(read, _IO_file_read),
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JUMP_INIT(write, _IO_file_write),
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JUMP_INIT(seek, _IO_file_seek),
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JUMP_INIT(close, _IO_proc_close),
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JUMP_INIT(stat, _IO_file_stat)
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};
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