| 1 | /*
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| 2 | * push - anyone remember TOPS-20?
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| 3 | *
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| 4 | */
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| 5 |
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| 6 | #include <config.h>
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| 7 | #include <stdio.h>
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| 8 | #include <errno.h>
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| 9 |
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| 10 | #include "builtins.h"
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| 11 | #include "shell.h"
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| 12 | #include "jobs.h"
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| 13 | #include "bashgetopt.h"
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| 14 |
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| 15 | #ifndef errno
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| 16 | extern int errno;
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| 17 | #endif
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| 18 |
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| 19 | extern int dollar_dollar_pid;
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| 20 | extern int last_command_exit_value;
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| 21 |
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| 22 | int
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| 23 | push_builtin (list)
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| 24 | WORD_LIST *list;
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| 25 | {
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| 26 | pid_t pid;
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| 27 | int xstatus, opt;
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| 28 |
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| 29 | xstatus = EXECUTION_SUCCESS;
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| 30 | reset_internal_getopt ();
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| 31 | while ((opt = internal_getopt (list, "")) != -1)
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| 32 | {
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| 33 | switch (opt)
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| 34 | {
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| 35 | default:
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| 36 | builtin_usage ();
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| 37 | return (EX_USAGE);
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| 38 | }
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| 39 | }
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| 40 | list = loptend;
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| 41 |
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| 42 | pid = make_child (savestring ("push"), 0);
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| 43 | if (pid == -1)
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| 44 | {
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| 45 | builtin_error ("cannot fork: %s", strerror (errno));
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| 46 | return (EXECUTION_FAILURE);
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| 47 | }
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| 48 | else if (pid == 0)
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| 49 | {
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| 50 | /* Shell variable adjustments: $SHLVL, $$, $PPID, $! */
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| 51 | adjust_shell_level (1);
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| 52 | dollar_dollar_pid = getpid ();
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| 53 | set_ppid ();
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| 54 |
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| 55 | /* Clean up job control stuff. */
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| 56 | stop_making_children ();
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| 57 | cleanup_the_pipeline ();
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| 58 | delete_all_jobs (0);
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| 59 |
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| 60 | last_asynchronous_pid = NO_PID;
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| 61 |
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| 62 | /* Make sure the job control code has the right values for
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| 63 | the shell's process group and tty process group, and that
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| 64 | the signals are set correctly for job control. */
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| 65 | initialize_job_control (0);
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| 66 | initialize_job_signals ();
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| 67 |
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| 68 | /* And read commands until exit. */
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| 69 | reader_loop ();
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| 70 | exit_shell (last_command_exit_value);
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| 71 | }
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| 72 | else
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| 73 | {
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| 74 | stop_pipeline (0, (COMMAND *)NULL);
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| 75 | xstatus = wait_for (pid);
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| 76 | return (xstatus);
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| 77 | }
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| 78 | }
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| 79 |
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| 80 | char *push_doc[] = {
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| 81 | "Create a child that is an exact duplicate of the running shell",
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| 82 | "and wait for it to exit. The $SHLVL, $!, $$, and $PPID variables",
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| 83 | "are adjusted in the child. The return value is the exit status",
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| 84 | "of the child.",
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| 85 | (char *)NULL
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| 86 | };
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| 87 |
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| 88 | struct builtin push_struct = {
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| 89 | "push",
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| 90 | push_builtin,
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| 91 | BUILTIN_ENABLED,
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| 92 | push_doc,
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| 93 | "push",
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| 94 | 0
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| 95 | };
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