mirror of https://github.com/sheumann/hush.git
hush: fix EXIT trap recursion case; check redirection failures
function old new delta run_pipe 1299 1328 +29 hush_exit 90 102 +12 hush_main 1172 1179 +7 run_list 1226 1225 -1 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 3/1 up/down: 48/-1) Total: 47 bytes
This commit is contained in:
Denis Vlasenko
parent
f81e8dbc74
commit
efea9d2819
76
shell/hush.c
76
shell/hush.c
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@ -513,6 +513,7 @@ struct globals {
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smallint flag_break_continue;
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#endif
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smallint fake_mode;
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smallint exiting; /* used to prevent EXIT trap recursion */
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/* These four support $?, $#, and $1 */
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smalluint last_exitcode;
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/* are global_argv and global_argv[1..n] malloced? (note: not [0]) */
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@ -851,7 +852,7 @@ static void free_strings(char **strings)
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*
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* Trap handlers will execute even within trap handlers. (right?)
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*
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* User trap handlers are forgotten when subshell ("(cmd)") is entered. [TODO]
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* User trap handlers are forgotten when subshell ("(cmd)") is entered.
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*
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* If job control is off, backgrounded commands ("cmd &")
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* have SIGINT, SIGQUIT set to SIG_IGN.
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@ -905,7 +906,7 @@ static void free_strings(char **strings)
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* set bit in blocked_set (even if 'cmd' is '')
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* after [v]fork, if we plan to be a shell:
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* nothing for {} child shell (say, "true | { true; true; } | true")
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* unset all traps if () shell. [TODO]
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* unset all traps if () shell.
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* after [v]fork, if we plan to exec:
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* POSIX says pending signal mask is cleared in child - no need to clear it.
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* Restore blocked signal set to one inherited by shell just prior to exec.
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@ -1005,9 +1006,13 @@ static void sigexit(int sig)
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static void hush_exit(int exitcode) NORETURN;
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static void hush_exit(int exitcode)
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{
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if (G.traps && G.traps[0] && G.traps[0][0]) {
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char *argv[] = { NULL, xstrdup(G.traps[0]), NULL };
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//TODO: do we need to prevent recursion?
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if (G.exiting <= 0 && G.traps && G.traps[0] && G.traps[0][0]) {
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/* Prevent recursion:
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* trap "echo Hi; exit" EXIT; exit
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*/
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char *argv[] = { NULL, G.traps[0], NULL };
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G.traps[0] = NULL;
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G.exiting = 1;
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builtin_eval(argv);
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free(argv[1]);
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}
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@ -2350,7 +2355,6 @@ static void setup_heredoc(struct redir_struct *redir)
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* and stderr if they are redirected. */
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static int setup_redirects(struct command *prog, int squirrel[])
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{
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//TODO: no callers ever check return value - ?!
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int openfd, mode;
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struct redir_struct *redir;
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@ -2952,11 +2956,13 @@ static int run_pipe(struct pipe *pi)
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#endif
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/* { list } */
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debug_printf("non-subshell group\n");
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setup_redirects(command, squirrel);
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debug_printf_exec(": run_list\n");
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rcode = run_list(command->group) & 0xff;
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rcode = 1; /* exitcode if redir failed */
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if (setup_redirects(command, squirrel) == 0) {
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debug_printf_exec(": run_list\n");
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rcode = run_list(command->group) & 0xff;
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debug_printf_exec("run_pipe return %d\n", rcode);
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}
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restore_redirects(squirrel);
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debug_printf_exec("run_pipe return %d\n", rcode);
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IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
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return rcode;
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}
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@ -2970,7 +2976,7 @@ static int run_pipe(struct pipe *pi)
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if (argv[command->assignment_cnt] == NULL) {
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/* Assignments, but no command */
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/* Ensure redirects take effect. Try "a=t >file" */
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setup_redirects(command, squirrel);
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rcode = setup_redirects(command, squirrel);
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restore_redirects(squirrel);
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/* Set shell variables */
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while (*argv) {
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@ -2983,7 +2989,8 @@ static int run_pipe(struct pipe *pi)
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/* Do we need to flag set_local_var() errors?
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* "assignment to readonly var" and "putenv error"
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*/
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return EXIT_SUCCESS;
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IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
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return rcode;
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}
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/* Expand the rest into (possibly) many strings each */
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@ -2994,8 +3001,7 @@ static int run_pipe(struct pipe *pi)
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continue;
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if (x->function == builtin_exec && argv_expanded[1] == NULL) {
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debug_printf("exec with redirects only\n");
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setup_redirects(command, NULL);
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rcode = EXIT_SUCCESS;
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rcode = setup_redirects(command, NULL);
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goto clean_up_and_ret1;
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}
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debug_printf("builtin inline %s\n", argv_expanded[0]);
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@ -3003,12 +3009,14 @@ static int run_pipe(struct pipe *pi)
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* This is perfect for work that comes after exec().
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* Is it really safe for inline use? Experimentally,
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* things seem to work with glibc. */
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setup_redirects(command, squirrel);
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new_env = expand_assignments(argv, command->assignment_cnt);
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old_env = putenv_all_and_save_old(new_env);
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debug_printf_exec(": builtin '%s' '%s'...\n",
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x->cmd, argv_expanded[1]);
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rcode = x->function(argv_expanded) & 0xff;
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rcode = setup_redirects(command, squirrel);
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if (rcode == 0) {
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new_env = expand_assignments(argv, command->assignment_cnt);
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old_env = putenv_all_and_save_old(new_env);
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debug_printf_exec(": builtin '%s' '%s'...\n",
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x->cmd, argv_expanded[1]);
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rcode = x->function(argv_expanded) & 0xff;
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}
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#if ENABLE_FEATURE_SH_STANDALONE
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clean_up_and_ret:
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#endif
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@ -3027,13 +3035,15 @@ static int run_pipe(struct pipe *pi)
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#if ENABLE_FEATURE_SH_STANDALONE
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i = find_applet_by_name(argv_expanded[0]);
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if (i >= 0 && APPLET_IS_NOFORK(i)) {
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setup_redirects(command, squirrel);
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save_nofork_data(&G.nofork_save);
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new_env = expand_assignments(argv, command->assignment_cnt);
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old_env = putenv_all_and_save_old(new_env);
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debug_printf_exec(": run_nofork_applet '%s' '%s'...\n",
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rcode = setup_redirects(command, squirrel);
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if (rcode == 0) {
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save_nofork_data(&G.nofork_save);
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new_env = expand_assignments(argv, command->assignment_cnt);
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old_env = putenv_all_and_save_old(new_env);
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debug_printf_exec(": run_nofork_applet '%s' '%s'...\n",
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argv_expanded[0], argv_expanded[1]);
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rcode = run_nofork_applet_prime(&G.nofork_save, i, argv_expanded);
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rcode = run_nofork_applet_prime(&G.nofork_save, i, argv_expanded);
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}
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goto clean_up_and_ret;
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}
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#endif
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@ -3095,7 +3105,8 @@ static int run_pipe(struct pipe *pi)
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close(pipefds[0]); /* read end */
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/* Like bash, explicit redirects override pipes,
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* and the pipe fd is available for dup'ing. */
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setup_redirects(command, NULL);
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if (setup_redirects(command, NULL))
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_exit(1);
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/* Restore default handlers just prior to exec */
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/*signal(SIGCHLD, SIG_DFL); - so far we don't have any handlers */
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@ -3324,9 +3335,9 @@ static int run_list(struct pipe *pi)
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//// /* ctrl-Z handler will store pid etc in pi */
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//// G.toplevel_list = pi;
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//// G.ctrl_z_flag = 0;
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////#if ENABLE_FEATURE_SH_STANDALONE
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//// G.nofork_save.saved = 0; /* in case we will run a nofork later */
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////#endif
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#if ENABLE_FEATURE_SH_STANDALONE
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G.nofork_save.saved = 0; /* in case we will run a nofork later */
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#endif
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//// signal_SA_RESTART_empty_mask(SIGTSTP, handler_ctrl_z);
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//// signal(SIGINT, handler_ctrl_c);
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}
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@ -5680,6 +5691,8 @@ int hush_main(int argc, char **argv)
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enable_restore_tty_pgrp_on_exit(); /* sets die_sleep = -1 */
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if (setjmp(die_jmp)) {
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/* xfunc has failed! die die die */
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/* no EXIT traps, this is an escape hatch! */
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G.exiting = 1;
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hush_exit(xfunc_error_retval);
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}
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} else if (!signal_mask_is_inited) {
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@ -5907,6 +5920,9 @@ static int builtin_exit(char **argv)
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//puts("exit"); /* bash does it */
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// TODO: warn if we have background jobs: "There are stopped jobs"
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// On second consecutive 'exit', exit anyway.
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// perhaps use G.exiting = -1 as indicator "last cmd was exit"
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/* note: EXIT trap is run by hush_exit */
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if (*++argv == NULL)
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hush_exit(G.last_exitcode);
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/* mimic bash: exit 123abc == exit 255 + error msg */
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@ -0,0 +1 @@
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Once
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@ -0,0 +1,4 @@
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trap "echo Not shown" EXIT
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(exit) # must be silent
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trap "echo Once; exit" EXIT
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{ exit; }
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@ -0,0 +1,14 @@
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hush: can't open '/does/not/exist': No such file or directory
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One:1
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hush: can't open '/cant/be/created': No such file or directory
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One:1
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Ok
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hush: can't open '/cant/be/created': No such file or directory
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Zero:0
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hush: can't open '/cant/be/created': No such file or directory
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One:1
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hush: can't open '/cant/be/created': No such file or directory
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One:1
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hush: can't open '/cant/be/created': No such file or directory
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Zero:0
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Done
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@ -0,0 +1,9 @@
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echo Error >/does/not/exist; echo One:$?
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t=BAD
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t=Ok >>/cant/be/created; echo One:$?
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echo $t
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! >/cant/be/created; echo Zero:$?
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exec >/cant/be/created; echo One:$?
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exec /bin/true >/cant/be/created; echo One:$?
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! exec /bin/true >/cant/be/created; echo Zero:$?
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echo Done
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