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https://github.com/sheumann/hush.git
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hush: fix trap clearing in subshells on MMU; simplify NOMMU a bit:
function old new delta parse_stream_dquoted 335 324 -11 handle_dollar 849 800 -49 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-60) Total: -60 bytes
This commit is contained in:
Denis Vlasenko
parent
f937528571
commit
c4a7af55e9
124
shell/hush.c
124
shell/hush.c
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@ -1603,10 +1603,10 @@ static int process_command_subs(o_string *dest, const char *s);
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#endif
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static char *expand_string_to_string(const char *str);
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#if BB_MMU
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#define parse_stream_dquoted(ctx, dest, input, dquote_end) \
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#define parse_stream_dquoted(as_string, dest, input, dquote_end) \
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parse_stream_dquoted(dest, input, dquote_end)
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#endif
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static int parse_stream_dquoted(struct parse_context *ctx,
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static int parse_stream_dquoted(o_string *as_string,
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o_string *dest,
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struct in_str *input,
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int dquote_end);
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@ -2275,7 +2275,38 @@ static void pseudo_exec_argv(nommu_save_t *nommu_save,
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_exit(EXIT_FAILURE);
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}
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#if !BB_MMU
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#if BB_MMU
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static void reset_traps_to_defaults(void)
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{
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unsigned sig;
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int dirty;
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if (!G.traps)
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return;
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dirty = 0;
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for (sig = 0; sig < NSIG; sig++) {
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if (!G.traps[sig])
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continue;
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free(G.traps[sig]);
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G.traps[sig] = NULL;
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/* There is no signal for 0 (EXIT) */
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if (sig == 0)
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continue;
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/* there was a trap handler, we are removing it
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* (if sig has non-DFL handling,
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* we don't need to do anything) */
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if (sig < 32 && (G.non_DFL_mask & (1 << sig)))
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continue;
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sigdelset(&G.blocked_set, sig);
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dirty = 1;
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}
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if (dirty)
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sigprocmask(SIG_SETMASK, &G.blocked_set, NULL);
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}
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#define clean_up_after_re_execute() ((void)0)
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#else /* !BB_MMU */
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static void re_execute_shell(const char *s) NORETURN;
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static void re_execute_shell(const char *s)
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{
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@ -2310,13 +2341,32 @@ static void re_execute_shell(const char *s)
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*pp++ = cur->varstr;
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}
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}
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//TODO: pass functions
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/* We can pass activated traps here. Say, -Tnn:trap_string
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*
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* However, POSIX says that subshells reset signals with traps
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* to SIG_DFL.
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* I tested bash-3.2 and it not only does that with true subshells
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* of the form ( list ), but with any forked children shells.
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* I set trap "echo W" WINCH; and then tried:
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*
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* { echo 1; sleep 20; echo 2; } &
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* while true; do echo 1; sleep 20; echo 2; break; done &
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* true | { echo 1; sleep 20; echo 2; } | cat
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*
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* In all these cases sending SIGWINCH to the child shell
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* did not run the trap. If I add trap "echo V" WINCH;
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* _inside_ group (just before echo 1), it works.
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*
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* I conclude it means we don't need to pass active traps here.
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* exec syscall below resets them to SIG_DFL for us.
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*/
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*pp++ = (char *) "-c";
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*pp++ = (char *) s;
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pp2 = G.global_argv;
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while (*pp2)
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*pp++ = *pp2++;
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/* *pp = NULL; - is already there */
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//TODO: pass traps and functions
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debug_printf_exec("re_execute_shell pid:%d cmd:'%s'\n", getpid(), s);
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sigprocmask(SIG_SETMASK, &G.inherited_set, NULL);
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@ -2343,8 +2393,6 @@ static void clean_up_after_re_execute(void)
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G.argv_from_re_execing = NULL;
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}
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}
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#else
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#define clean_up_after_re_execute() ((void)0)
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#endif
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static int run_list(struct pipe *pi);
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@ -2373,6 +2421,7 @@ static void pseudo_exec(nommu_save_t *nommu_save,
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#if BB_MMU
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int rcode;
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debug_printf_exec("pseudo_exec: run_list\n");
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reset_traps_to_defaults();
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rcode = run_list(command->group);
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/* OK to leak memory by not calling free_pipe_list,
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* since this process is about to exit */
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@ -3846,6 +3895,7 @@ static FILE *generate_stream_from_string(const char *s)
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/* Prevent it from trying to handle ctrl-z etc */
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USE_HUSH_JOB(G.run_list_level = 1;)
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#if BB_MMU
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reset_traps_to_defaults();
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parse_and_run_string(s);
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_exit(G.last_return_code);
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#else
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@ -4097,10 +4147,10 @@ static void add_till_closing_paren(o_string *dest, struct in_str *input, bool db
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/* Return code: 0 for OK, 1 for syntax error */
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#if BB_MMU
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#define handle_dollar(ctx, dest, input) \
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#define handle_dollar(as_string, dest, input) \
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handle_dollar(dest, input)
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#endif
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static int handle_dollar(struct parse_context *ctx,
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static int handle_dollar(o_string *as_string,
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o_string *dest,
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struct in_str *input)
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{
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@ -4112,7 +4162,7 @@ static int handle_dollar(struct parse_context *ctx,
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if (isalpha(ch)) {
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ch = i_getch(input);
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#if !BB_MMU
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if (ctx) o_addchr(&ctx->as_string, ch);
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if (as_string) o_addchr(as_string, ch);
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#endif
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make_var:
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o_addchr(dest, SPECIAL_VAR_SYMBOL);
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@ -4125,7 +4175,7 @@ static int handle_dollar(struct parse_context *ctx,
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break;
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ch = i_getch(input);
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#if !BB_MMU
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if (ctx) o_addchr(&ctx->as_string, ch);
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if (as_string) o_addchr(as_string, ch);
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#endif
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}
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o_addchr(dest, SPECIAL_VAR_SYMBOL);
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@ -4133,7 +4183,7 @@ static int handle_dollar(struct parse_context *ctx,
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make_one_char_var:
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ch = i_getch(input);
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#if !BB_MMU
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if (ctx) o_addchr(&ctx->as_string, ch);
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if (as_string) o_addchr(as_string, ch);
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#endif
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o_addchr(dest, SPECIAL_VAR_SYMBOL);
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debug_printf_parse(": '%c'\n", ch);
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@ -4153,7 +4203,7 @@ static int handle_dollar(struct parse_context *ctx,
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o_addchr(dest, SPECIAL_VAR_SYMBOL);
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ch = i_getch(input);
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#if !BB_MMU
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if (ctx) o_addchr(&ctx->as_string, ch);
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if (as_string) o_addchr(as_string, ch);
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#endif
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/* XXX maybe someone will try to escape the '}' */
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expansion = 0;
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@ -4162,7 +4212,7 @@ static int handle_dollar(struct parse_context *ctx,
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while (1) {
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ch = i_getch(input);
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#if !BB_MMU
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if (ctx) o_addchr(&ctx->as_string, ch);
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if (as_string) o_addchr(as_string, ch);
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#endif
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if (ch == '}')
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break;
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@ -4235,13 +4285,13 @@ static int handle_dollar(struct parse_context *ctx,
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# endif
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ch = i_getch(input);
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# if !BB_MMU
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if (ctx) o_addchr(&ctx->as_string, ch);
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if (as_string) o_addchr(as_string, ch);
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# endif
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# if ENABLE_SH_MATH_SUPPORT
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if (i_peek(input) == '(') {
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ch = i_getch(input);
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# if !BB_MMU
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if (ctx) o_addchr(&ctx->as_string, ch);
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if (as_string) o_addchr(as_string, ch);
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# endif
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o_addchr(dest, SPECIAL_VAR_SYMBOL);
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o_addchr(dest, /*quote_mask |*/ '+');
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@ -4250,10 +4300,10 @@ static int handle_dollar(struct parse_context *ctx,
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# endif
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add_till_closing_paren(dest, input, true);
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# if !BB_MMU
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if (ctx) {
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o_addstr(&ctx->as_string, dest->data + pos);
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o_addchr(&ctx->as_string, ')');
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o_addchr(&ctx->as_string, ')');
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if (as_string) {
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o_addstr(as_string, dest->data + pos);
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o_addchr(as_string, ')');
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o_addchr(as_string, ')');
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}
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# endif
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o_addchr(dest, SPECIAL_VAR_SYMBOL);
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@ -4269,9 +4319,9 @@ static int handle_dollar(struct parse_context *ctx,
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# endif
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add_till_closing_paren(dest, input, false);
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# if !BB_MMU
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if (ctx) {
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o_addstr(&ctx->as_string, dest->data + pos);
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o_addchr(&ctx->as_string, '`');
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if (as_string) {
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o_addstr(as_string, dest->data + pos);
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o_addchr(as_string, '`');
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}
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# endif
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//debug_printf_subst("SUBST RES2 '%s'\n", dest->data + pos);
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@ -4283,7 +4333,7 @@ static int handle_dollar(struct parse_context *ctx,
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case '_':
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ch = i_getch(input);
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#if !BB_MMU
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if (ctx) o_addchr(&ctx->as_string, ch);
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if (as_string) o_addchr(as_string, ch);
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#endif
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ch = i_peek(input);
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if (isalnum(ch)) { /* it's $_name or $_123 */
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@ -4302,10 +4352,10 @@ static int handle_dollar(struct parse_context *ctx,
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}
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#if BB_MMU
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#define parse_stream_dquoted(ctx, dest, input, dquote_end) \
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#define parse_stream_dquoted(as_string, dest, input, dquote_end) \
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parse_stream_dquoted(dest, input, dquote_end)
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#endif
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static int parse_stream_dquoted(struct parse_context *ctx,
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static int parse_stream_dquoted(o_string *as_string,
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o_string *dest,
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struct in_str *input,
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int dquote_end)
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@ -4316,8 +4366,8 @@ static int parse_stream_dquoted(struct parse_context *ctx,
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again:
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ch = i_getch(input);
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#if !BB_MMU
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if (ctx && ch != EOF)
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o_addchr(&ctx->as_string, ch);
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if (as_string && ch != EOF)
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o_addchr(as_string, ch);
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#endif
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if (ch == dquote_end) { /* may be only '"' or EOF */
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dest->nonnull = 1;
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@ -4360,7 +4410,7 @@ static int parse_stream_dquoted(struct parse_context *ctx,
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goto again;
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}
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if (ch == '$') {
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if (handle_dollar(ctx, dest, input) != 0) {
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if (handle_dollar(as_string, dest, input) != 0) {
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debug_printf_parse("parse_stream_dquoted return 1: "
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"handle_dollar returned non-0\n");
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return 1;
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@ -4432,7 +4482,7 @@ static struct pipe *parse_stream(char **pstring,
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redir_type redir_style;
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if (is_in_dquote) {
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if (parse_stream_dquoted(&ctx, &dest, input, '"')) {
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if (parse_stream_dquoted(&ctx.as_string, &dest, input, '"')) {
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goto parse_error;
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}
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/* We reached closing '"' */
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@ -4579,8 +4629,7 @@ static struct pipe *parse_stream(char **pstring,
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#endif
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break;
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case '$':
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//NOMMU TODO!
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if (handle_dollar(&ctx, &dest, input) != 0) {
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if (handle_dollar(&ctx.as_string, &dest, input) != 0) {
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debug_printf_parse("parse_stream parse error: "
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"handle_dollar returned non-0\n");
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goto parse_error;
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@ -5023,6 +5072,15 @@ int hush_main(int argc, char **argv)
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G.PS2 = "> ";
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#endif
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/* Shell is non-interactive at first. We need to call
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* block_signals(0) if we are going to execute "sh script",
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* "sh -c cmds" or login shell's /etc/profile and friends.
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* If we later decide that we are interactive, we run block_signals(0)
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* (or re-run block_signals(1) if we ran block_signals(0) before)
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* in order to intercept (more) signals.
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*/
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/* Parse options */
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/* http://www.opengroup.org/onlinepubs/9699919799/utilities/sh.html */
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while (1) {
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opt = getopt(argc, argv, "c:xins"
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@ -5136,7 +5194,9 @@ int hush_main(int argc, char **argv)
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goto final_return;
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}
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/* Up to here, shell was non-interactive. Now it may become one. */
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/* Up to here, shell was non-interactive. Now it may become one.
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* NB: don't forget to (re)run block_signals(0/1) as needed.
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*/
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/* A shell is interactive if the '-i' flag was given, or if all of
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* the following conditions are met:
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