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/*
* push - anyone remember TOPS-20?
*
*/
/*
Copyright (C) 1999-2020 Free Software Foundation, Inc.
This file is part of GNU Bash.
Bash 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 3 of the License, or
(at your option) any later version.
Bash 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 Bash. If not, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include <stdio.h>
#include <errno.h>
#include "builtins.h"
#include "shell.h"
#include "jobs.h"
#include "bashgetopt.h"
#include "common.h"
#ifndef errno
extern int errno;
#endif
extern pid_t dollar_dollar_pid;
extern int last_command_exit_value;
int
push_builtin (list)
WORD_LIST *list;
{
pid_t pid;
int xstatus, opt;
xstatus = EXECUTION_SUCCESS;
reset_internal_getopt ();
while ((opt = internal_getopt (list, "")) != -1)
{
switch (opt)
{
CASE_HELPOPT;
default:
builtin_usage ();
return (EX_USAGE);
}
}
list = loptend;
pid = make_child (savestring ("push"), 0);
if (pid == -1)
{
builtin_error ("cannot fork: %s", strerror (errno));
return (EXECUTION_FAILURE);
}
else if (pid == 0)
{
/* Shell variable adjustments: $SHLVL, $$, $PPID, $! */
adjust_shell_level (1);
dollar_dollar_pid = getpid ();
set_ppid ();
/* Clean up job control stuff. */
stop_making_children ();
cleanup_the_pipeline ();
delete_all_jobs (0);
last_asynchronous_pid = NO_PID;
/* Make sure the job control code has the right values for
the shell's process group and tty process group, and that
the signals are set correctly for job control. */
initialize_job_control (0);
initialize_job_signals ();
/* And read commands until exit. */
reader_loop ();
exit_shell (last_command_exit_value);
}
else
{
stop_pipeline (0, (COMMAND *)NULL);
xstatus = wait_for (pid, 0);
return (xstatus);
}
}
char *push_doc[] = {
"Create child shell.",
"",
"Create a child that is an exact duplicate of the running shell",
"and wait for it to exit. The $SHLVL, $!, $$, and $PPID variables",
"are adjusted in the child. The return value is the exit status",
"of the child.",
(char *)NULL
};
struct builtin push_struct = {
"push",
push_builtin,
BUILTIN_ENABLED,
push_doc,
"push",
0
};
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