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* inflow.c (new_tty_prefork, new_tty): New prefork routine

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modifies static state in the parent process; new_tty itself
        runs in the child and modifies the child's file descriptors
        to match the saved static state.
        * infrun.c (child_create_inferior):  Call new_tty_prefork,
        fork, then new_tty.
This commit is contained in:
John Gilmore 1991-08-14 00:09:58 +00:00
parent 8f1f2a72bd
commit 715d2e0649
1 changed files with 26 additions and 17 deletions
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43
gdb/inflow.c
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@ -3,19 +3,19 @@
This file is part of GDB.
GDB is free software; you can redistribute it and/or modify
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 1, or (at your option)
any later version.
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
GDB is distributed in the hope that it will be useful,
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GDB; see the file COPYING. If not, write to
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <stdio.h>
#include "defs.h"
@ -258,6 +258,7 @@ term_info (arg, from_tty)
target_terminal_info (arg, from_tty);
}
/* ARGSUSED */
void
child_terminal_info (args, from_tty)
char *args;
@ -304,21 +305,29 @@ child_terminal_info (args, from_tty)
#endif
}
/* NEW_TTY is called in new child processes under Unix, which will
become debugger target processes.
If the TTYNAME argument is non-null, we switch to that tty for further
input and output. In either case, we remember the setup. */
/* NEW_TTY_PREFORK is called before forking a new child process,
so we can record the state of ttys in the child to be formed.
TTYNAME is null if we are to share the terminal with gdb;
or points to a string containing the name of the desired tty.
void
new_tty (ttyname)
NEW_TTY is called in new child processes under Unix, which will
become debugger target processes. This actually switches to
the terminal specified in the NEW_TTY_PREFORK call. */
new_tty_prefork (ttyname)
char *ttyname;
{
register int tty;
/* Save the name for later, for determining whether we and the child
are sharing a tty. */
inferior_thisrun_terminal = ttyname;
if (ttyname == 0)
}
void
new_tty ()
{
register int tty;
if (inferior_thisrun_terminal == 0)
return;
#ifdef TIOCNOTTY
@ -333,10 +342,10 @@ new_tty (ttyname)
/* Now open the specified new terminal. */
tty = open(ttyname, O_RDWR);
tty = open(inferior_thisrun_terminal, O_RDWR);
if (tty == -1)
{
print_sys_errmsg (ttyname, errno);
print_sys_errmsg (inferior_thisrun_terminal, errno);
_exit(1);
}