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-rw-r--r--examples/loadables/push.c117
1 files changed, 117 insertions, 0 deletions
diff --git a/examples/loadables/push.c b/examples/loadables/push.c
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--- /dev/null
+++ b/examples/loadables/push.c
@@ -0,0 +1,117 @@
+/*
+ * 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
+};