hush: make job control and interactiveness configurable, part 2
This commit is contained in:
Denis Vlasenko
parent
b81b3df1fa
commit
e3f2f89891
@ -181,9 +181,21 @@ config HUSH_INTERACTIVE
|
||||
default y
|
||||
depends on HUSH
|
||||
help
|
||||
Enable interactive mode (Ctrl-Z, Ctrl-C, command editing)
|
||||
in the hush shell. Without this, hush reads and executes
|
||||
stdin just like a shell script from the file.
|
||||
Enable interactive mode (prompt and command editing).
|
||||
Without this, hush simply reads and executes commands
|
||||
from stdin just like a shell script from the file.
|
||||
No prompt, no PS1/PS2 magic shell variables.
|
||||
|
||||
config HUSH_JOB
|
||||
bool "Job control"
|
||||
default n
|
||||
depends on HUSH_INTERACTIVE
|
||||
help
|
||||
Enable job control: Ctrl-Z backgrounds, Ctrl-C interrupts current
|
||||
command (not entire shell), fg/bg builtins work. Without this option,
|
||||
"cmd &" still works by simply spawning a process and immediately
|
||||
prompting for next command (or executing next command in a script),
|
||||
but no separate process group is formed.
|
||||
|
||||
|
||||
config LASH
|
||||
|
||||
131
shell/hush.c
131
shell/hush.c
@ -86,10 +86,6 @@
|
||||
/* Finer-grained debug switch */
|
||||
//#define DEBUG_SHELL_JOBS
|
||||
|
||||
//TODO: rename HUSH_INTERACTIVE -> HUSH_JOB,
|
||||
//create HUSH_INTERACTIVE which controls only prompt + line editing,
|
||||
//make HUSH_JOB dependent on it
|
||||
|
||||
#if !ENABLE_HUSH_INTERACTIVE
|
||||
#undef ENABLE_FEATURE_EDITING
|
||||
#define ENABLE_FEATURE_EDITING 0
|
||||
@ -204,7 +200,7 @@ struct pipe {
|
||||
int num_progs; /* total number of programs in job */
|
||||
int running_progs; /* number of programs running (not exited) */
|
||||
char *cmdbuf; /* buffer various argv's point into */
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
#if ENABLE_HUSH_JOB
|
||||
int jobid; /* job number */
|
||||
char *cmdtext; /* name of job */
|
||||
pid_t pgrp; /* process group ID for the job */
|
||||
@ -243,25 +239,26 @@ static int fake_mode;
|
||||
static struct close_me *close_me_head;
|
||||
static const char *cwd;
|
||||
static unsigned last_bg_pid;
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
static int last_jobid;
|
||||
static struct pipe *job_list;
|
||||
#if !ENABLE_HUSH_INTERACTIVE
|
||||
enum { interactive_fd = 0 };
|
||||
#else
|
||||
/* 'interactive_fd' is a fd# open to ctty, if we have one
|
||||
* _AND_ if we decided to mess with job control */
|
||||
static int interactive_fd;
|
||||
#if ENABLE_HUSH_JOB
|
||||
static pid_t saved_task_pgrp;
|
||||
static pid_t saved_tty_pgrp;
|
||||
#else
|
||||
enum { interactive_fd = 0 };
|
||||
static int last_jobid;
|
||||
static struct pipe *job_list;
|
||||
#endif
|
||||
|
||||
static const char *PS1;
|
||||
static const char *PS2;
|
||||
#endif
|
||||
|
||||
static struct variables shell_ver = { NULL, "HUSH_VERSION", "0.01", 1, 1 };
|
||||
static struct variables *top_vars = &shell_ver;
|
||||
|
||||
|
||||
#define B_CHUNK (100)
|
||||
#define B_CHUNK 100
|
||||
#define B_NOSPAC 1
|
||||
|
||||
typedef struct {
|
||||
@ -280,8 +277,10 @@ typedef struct {
|
||||
struct in_str {
|
||||
const char *p;
|
||||
char peek_buf[2];
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
int __promptme;
|
||||
int promptmode;
|
||||
#endif
|
||||
FILE *file;
|
||||
int (*get) (struct in_str *);
|
||||
int (*peek) (struct in_str *);
|
||||
@ -323,12 +322,11 @@ static char *indenter(int i)
|
||||
|
||||
#define final_printf debug_printf
|
||||
|
||||
static void __syntax(const char *file, int line)
|
||||
static void __syntax(int line)
|
||||
{
|
||||
bb_error_msg("syntax error %s:%d", file, line);
|
||||
bb_error_msg("syntax error hush.c:%d", line);
|
||||
}
|
||||
/* NB: was __FILE__, but that produces full path sometimes, so... */
|
||||
#define syntax() __syntax("hush.c", __LINE__)
|
||||
#define syntax() __syntax(__LINE__)
|
||||
|
||||
/* Index of subroutines: */
|
||||
/* function prototypes for builtins */
|
||||
@ -338,7 +336,7 @@ static int builtin_eval(char **argv);
|
||||
static int builtin_exec(char **argv);
|
||||
static int builtin_exit(char **argv);
|
||||
static int builtin_export(char **argv);
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
#if ENABLE_HUSH_JOB
|
||||
static int builtin_fg_bg(char **argv);
|
||||
static int builtin_jobs(char **argv);
|
||||
#endif
|
||||
@ -405,7 +403,7 @@ static int parse_string_outer(const char *s, int flag);
|
||||
static int parse_file_outer(FILE *f);
|
||||
/* job management: */
|
||||
static int checkjobs(struct pipe* fg_pipe);
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
#if ENABLE_HUSH_JOB
|
||||
static int checkjobs_and_fg_shell(struct pipe* fg_pipe);
|
||||
static void insert_bg_job(struct pipe *pi);
|
||||
static void remove_bg_job(struct pipe *pi);
|
||||
@ -427,7 +425,7 @@ static void unset_local_var(const char *name);
|
||||
* For example, 'unset foo | whatever' will parse and run, but foo will
|
||||
* still be set at the end. */
|
||||
static const struct built_in_command bltins[] = {
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
#if ENABLE_HUSH_JOB
|
||||
{ "bg", "Resume a job in the background", builtin_fg_bg },
|
||||
#endif
|
||||
{ "break", "Exit for, while or until loop", builtin_not_written },
|
||||
@ -439,7 +437,7 @@ static const struct built_in_command bltins[] = {
|
||||
builtin_exec },
|
||||
{ "exit", "Exit from shell()", builtin_exit },
|
||||
{ "export", "Set environment variable", builtin_export },
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
#if ENABLE_HUSH_JOB
|
||||
{ "fg", "Bring job into the foreground", builtin_fg_bg },
|
||||
{ "jobs", "Lists the active jobs", builtin_jobs },
|
||||
#endif
|
||||
@ -457,7 +455,7 @@ static const struct built_in_command bltins[] = {
|
||||
{ NULL, NULL, NULL }
|
||||
};
|
||||
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
#if ENABLE_HUSH_JOB
|
||||
|
||||
#if ENABLE_FEATURE_SH_STANDALONE
|
||||
/* move to libbb? */
|
||||
@ -727,7 +725,7 @@ static int builtin_export(char **argv)
|
||||
return res;
|
||||
}
|
||||
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
#if ENABLE_HUSH_JOB
|
||||
/* built-in 'fg' and 'bg' handler */
|
||||
static int builtin_fg_bg(char **argv)
|
||||
{
|
||||
@ -807,7 +805,7 @@ static int builtin_help(char **argv ATTRIBUTE_UNUSED)
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
#if ENABLE_HUSH_JOB
|
||||
/* built-in 'jobs' handler */
|
||||
static int builtin_jobs(char **argv ATTRIBUTE_UNUSED)
|
||||
{
|
||||
@ -1032,6 +1030,7 @@ static int static_peek(struct in_str *i)
|
||||
return *i->p;
|
||||
}
|
||||
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
static void cmdedit_set_initial_prompt(void)
|
||||
{
|
||||
#if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
|
||||
@ -1065,17 +1064,19 @@ static const char* setup_prompt_string(int promptmode)
|
||||
debug_printf("result %s\n", prompt_str);
|
||||
return prompt_str;
|
||||
}
|
||||
#endif
|
||||
|
||||
#if ENABLE_FEATURE_EDITING
|
||||
static line_input_t *line_input_state;
|
||||
#endif
|
||||
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
static int get_user_input(struct in_str *i)
|
||||
{
|
||||
static char the_command[ENABLE_FEATURE_EDITING ? BUFSIZ : 2];
|
||||
|
||||
int r;
|
||||
const char *prompt_str;
|
||||
static char the_command[BUFSIZ];
|
||||
|
||||
prompt_str = setup_prompt_string(i->promptmode);
|
||||
#if ENABLE_FEATURE_EDITING
|
||||
/*
|
||||
@ -1095,6 +1096,7 @@ static int get_user_input(struct in_str *i)
|
||||
i->p = the_command;
|
||||
return r; /* < 0 == EOF. Not meaningful otherwise */
|
||||
}
|
||||
#endif
|
||||
|
||||
/* This is the magic location that prints prompts
|
||||
* and gets data back from the user */
|
||||
@ -1109,7 +1111,8 @@ static int file_get(struct in_str *i)
|
||||
} else {
|
||||
/* need to double check i->file because we might be doing something
|
||||
* more complicated by now, like sourcing or substituting. */
|
||||
if (i->__promptme && interactive_fd && i->file == stdin) {
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
if (interactive_fd && i->__promptme && i->file == stdin) {
|
||||
while (!i->p || !(interactive_fd && i->p[0])) {
|
||||
if (get_user_input(i) < 0)
|
||||
return EOF;
|
||||
@ -1119,14 +1122,17 @@ static int file_get(struct in_str *i)
|
||||
if (i->p && *i->p) {
|
||||
ch = *i->p++;
|
||||
}
|
||||
} else {
|
||||
} else
|
||||
#endif
|
||||
{
|
||||
ch = fgetc(i->file);
|
||||
}
|
||||
|
||||
debug_printf("b_getch: got a %d\n", ch);
|
||||
}
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
if (ch == '\n')
|
||||
i->__promptme = 1;
|
||||
#endif
|
||||
return ch;
|
||||
}
|
||||
|
||||
@ -1149,8 +1155,10 @@ static void setup_file_in_str(struct in_str *i, FILE *f)
|
||||
{
|
||||
i->peek = file_peek;
|
||||
i->get = file_get;
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
i->__promptme = 1;
|
||||
i->promptmode = 1;
|
||||
#endif
|
||||
i->file = f;
|
||||
i->p = NULL;
|
||||
}
|
||||
@ -1159,8 +1167,10 @@ static void setup_string_in_str(struct in_str *i, const char *s)
|
||||
{
|
||||
i->peek = static_peek;
|
||||
i->get = static_get;
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
i->__promptme = 1;
|
||||
i->promptmode = 1;
|
||||
#endif
|
||||
i->p = s;
|
||||
}
|
||||
|
||||
@ -1333,7 +1343,7 @@ static void pseudo_exec(struct child_prog *child)
|
||||
_exit(EXIT_SUCCESS);
|
||||
}
|
||||
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
#if ENABLE_HUSH_JOB
|
||||
static const char *get_cmdtext(struct pipe *pi)
|
||||
{
|
||||
char **argv;
|
||||
@ -1364,7 +1374,7 @@ static const char *get_cmdtext(struct pipe *pi)
|
||||
}
|
||||
#endif
|
||||
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
#if ENABLE_HUSH_JOB
|
||||
static void insert_bg_job(struct pipe *pi)
|
||||
{
|
||||
struct pipe *thejob;
|
||||
@ -1436,7 +1446,7 @@ static int checkjobs(struct pipe* fg_pipe)
|
||||
{
|
||||
int attributes;
|
||||
int status;
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
#if ENABLE_HUSH_JOB
|
||||
int prognum = 0;
|
||||
struct pipe *pi;
|
||||
#endif
|
||||
@ -1496,7 +1506,7 @@ static int checkjobs(struct pipe* fg_pipe)
|
||||
fg_pipe->running_progs, fg_pipe->stopped_progs);
|
||||
if (fg_pipe->running_progs - fg_pipe->stopped_progs <= 0) {
|
||||
/* All processes in fg pipe have exited/stopped */
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
#if ENABLE_HUSH_JOB
|
||||
if (fg_pipe->running_progs)
|
||||
insert_bg_job(fg_pipe);
|
||||
#endif
|
||||
@ -1509,7 +1519,7 @@ static int checkjobs(struct pipe* fg_pipe)
|
||||
/* fall through to searching process in bg pipes */
|
||||
}
|
||||
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
#if ENABLE_HUSH_JOB
|
||||
/* We asked to wait for bg or orphaned children */
|
||||
/* No need to remember exitcode in this case */
|
||||
for (pi = job_list; pi; pi = pi->next) {
|
||||
@ -1526,7 +1536,7 @@ static int checkjobs(struct pipe* fg_pipe)
|
||||
debug_printf("checkjobs: pid %d was not in our list!\n", childpid);
|
||||
goto wait_more;
|
||||
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
#if ENABLE_HUSH_JOB
|
||||
found_pi_and_prognum:
|
||||
if (dead) {
|
||||
/* child exited */
|
||||
@ -1556,7 +1566,7 @@ static int checkjobs(struct pipe* fg_pipe)
|
||||
return rcode;
|
||||
}
|
||||
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
#if ENABLE_HUSH_JOB
|
||||
static int checkjobs_and_fg_shell(struct pipe* fg_pipe)
|
||||
{
|
||||
pid_t p;
|
||||
@ -1575,7 +1585,7 @@ static int checkjobs_and_fg_shell(struct pipe* fg_pipe)
|
||||
static int run_single_fg_nofork(struct pipe *pi, const struct bb_applet *a,
|
||||
char **argv)
|
||||
{
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
#if ENABLE_HUSH_JOB
|
||||
int rcode;
|
||||
/* TSTP handler will store pid etc in pi */
|
||||
nofork_pipe = pi;
|
||||
@ -1637,7 +1647,7 @@ static int run_pipe_real(struct pipe *pi)
|
||||
const int single_fg = (pi->num_progs == 1 && pi->followup != PIPE_BG);
|
||||
|
||||
nextin = 0;
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
#if ENABLE_HUSH_JOB
|
||||
pi->pgrp = -1;
|
||||
#endif
|
||||
pi->running_progs = 0;
|
||||
@ -1766,7 +1776,7 @@ static int run_pipe_real(struct pipe *pi)
|
||||
if (!child->pid) { /* child */
|
||||
/* Every child adds itself to new process group
|
||||
* with pgid == pid of first child in pipe */
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
#if ENABLE_HUSH_JOB
|
||||
if (interactive_fd) {
|
||||
/* Don't do pgrp restore anymore on fatal signals */
|
||||
set_fatal_sighandler(SIG_DFL);
|
||||
@ -1805,7 +1815,7 @@ static int run_pipe_real(struct pipe *pi)
|
||||
|
||||
pi->running_progs++;
|
||||
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
#if ENABLE_HUSH_JOB
|
||||
/* Second and next children need to know pid of first one */
|
||||
if (pi->pgrp < 0)
|
||||
pi->pgrp = child->pid;
|
||||
@ -1937,14 +1947,17 @@ static int run_list_real(struct pipe *pi)
|
||||
/* XXX check bash's behavior with nontrivial pipes */
|
||||
/* XXX compute jobid */
|
||||
/* XXX what does bash do with attempts to background builtins? */
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
#if ENABLE_HUSH_JOB
|
||||
insert_bg_job(pi);
|
||||
#endif
|
||||
rcode = EXIT_SUCCESS;
|
||||
} else {
|
||||
#if ENABLE_HUSH_JOB
|
||||
if (interactive_fd) {
|
||||
rcode = checkjobs_and_fg_shell(pi);
|
||||
} else {
|
||||
} else
|
||||
#endif
|
||||
{
|
||||
rcode = checkjobs(pi);
|
||||
}
|
||||
debug_printf("checkjobs returned %d\n", rcode);
|
||||
@ -2012,7 +2025,7 @@ static int free_pipe(struct pipe *pi, int indent)
|
||||
}
|
||||
free(pi->progs); /* children are an array, they get freed all at once */
|
||||
pi->progs = NULL;
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
#if ENABLE_HUSH_JOB
|
||||
free(pi->cmdtext);
|
||||
pi->cmdtext = NULL;
|
||||
#endif
|
||||
@ -3084,7 +3097,9 @@ static int parse_stream_outer(struct in_str *inp, int flag)
|
||||
update_ifs_map();
|
||||
if (!(flag & FLAG_PARSE_SEMICOLON) || (flag & FLAG_REPARSING))
|
||||
mapset(";$&|", 0);
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
inp->promptmode = 1;
|
||||
#endif
|
||||
rcode = parse_stream(&temp, &ctx, inp, '\n');
|
||||
if (rcode != 1 && ctx.old_flag != 0) {
|
||||
syntax();
|
||||
@ -3124,7 +3139,7 @@ static int parse_file_outer(FILE *f)
|
||||
return rcode;
|
||||
}
|
||||
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
#if ENABLE_HUSH_JOB
|
||||
/* Make sure we have a controlling tty. If we get started under a job
|
||||
* aware app (like bash for example), make sure we are now in charge so
|
||||
* we don't fight over who gets the foreground */
|
||||
@ -3183,6 +3198,8 @@ int hush_main(int argc, char **argv)
|
||||
close_me_head = NULL;
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
interactive_fd = 0;
|
||||
#endif
|
||||
#if ENABLE_HUSH_JOB
|
||||
last_bg_pid = 0;
|
||||
job_list = NULL;
|
||||
last_jobid = 0;
|
||||
@ -3190,11 +3207,14 @@ int hush_main(int argc, char **argv)
|
||||
|
||||
/* Initialize some more globals to non-zero values */
|
||||
set_cwd();
|
||||
if (ENABLE_FEATURE_EDITING)
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
#if ENABLE_FEATURE_EDITING
|
||||
cmdedit_set_initial_prompt();
|
||||
else PS1 = NULL;
|
||||
#else
|
||||
PS1 = NULL;
|
||||
#endif
|
||||
PS2 = "> ";
|
||||
|
||||
#endif
|
||||
/* initialize our shell local variables with the values
|
||||
* currently living in the environment */
|
||||
e = environ;
|
||||
@ -3241,7 +3261,7 @@ int hush_main(int argc, char **argv)
|
||||
#endif
|
||||
}
|
||||
}
|
||||
#if ENABLE_HUSH_INTERACTIVE
|
||||
#if ENABLE_HUSH_JOB
|
||||
/* A shell is interactive if the '-i' flag was given, or if all of
|
||||
* the following conditions are met:
|
||||
* no -c command
|
||||
@ -3283,6 +3303,21 @@ int hush_main(int argc, char **argv)
|
||||
printf("Enter 'help' for a list of built-in commands.\n\n");
|
||||
#endif
|
||||
}
|
||||
#elif ENABLE_HUSH_INTERACTIVE
|
||||
/* no job control compiled, only prompt/line editing */
|
||||
if (argv[optind] == NULL && input == stdin
|
||||
&& isatty(STDIN_FILENO) && isatty(STDOUT_FILENO)
|
||||
) {
|
||||
interactive_fd = fcntl(STDIN_FILENO, F_DUPFD, 255);
|
||||
if (interactive_fd < 0) {
|
||||
/* try to dup to any fd */
|
||||
interactive_fd = dup(STDIN_FILENO);
|
||||
if (interactive_fd < 0)
|
||||
/* give up */
|
||||
interactive_fd = 0;
|
||||
}
|
||||
}
|
||||
|
||||
#endif
|
||||
|
||||
if (argv[optind] == NULL) {
|
||||
|
||||
Loading…
Reference in New Issue
Block a user