diff options
Diffstat (limited to 'shell')
| -rw-r--r-- | shell/hush.c | 73 |
1 files changed, 42 insertions, 31 deletions
diff --git a/shell/hush.c b/shell/hush.c index 8dda988..13a06a4 100644 --- a/shell/hush.c +++ b/shell/hush.c @@ -1022,6 +1022,15 @@ static void free_strings(char **strings) * are to count SIGCHLDs [disabled - bug somewhere, + bloat] * and to restore tty pgrp on signal-induced exit. */ +enum { + SPECIAL_INTERACTIVE_SIGS = 0 +#if ENABLE_HUSH_JOB + | (1 << SIGTTIN) | (1 << SIGTTOU) | (1 << SIGTSTP) +#endif + | (1 << SIGTERM) +//TODO | (1 << SIGHUP) + | (1 << SIGINT) +}; //static void SIGCHLD_handler(int sig UNUSED_PARAM) //{ @@ -1059,6 +1068,8 @@ static int check_and_run_traps(int sig) // G.count_SIGCHLD++; // break; case SIGINT: +//TODO: add putchar('\n') also when we detect that child was killed (sleep 5 + ^C) + /* Builtin was ^C'ed, make it look prettier: */ bb_putchar('\n'); G.flag_SIGINT = 1; break; @@ -2284,37 +2295,46 @@ void re_execute_shell(char ***to_free, const char *s, char *argv0, char **argv); static void reset_traps_to_defaults(void) { - enum { - JOBSIGS = (1 << SIGTTIN) | (1 << SIGTTOU) | (1 << SIGTSTP) - }; - unsigned sig; - - if (!G.traps && !(G.non_DFL_mask & JOBSIGS)) - return; - - /* This function is always called in a child shell. + /* This function is always called in a child shell + * after fork (not vfork, NOMMU doesn't use this function). * Child shells are not interactive. * SIGTTIN/SIGTTOU/SIGTSTP should not have special handling. * Testcase: (while :; do :; done) + ^Z should background. + * Same goes for SIGTERM, SIGHUP, SIGINT. */ - G.non_DFL_mask &= ~JOBSIGS; - sigdelset(&G.blocked_set, SIGTTIN); - sigdelset(&G.blocked_set, SIGTTOU); - sigdelset(&G.blocked_set, SIGTSTP); + unsigned sig; + unsigned mask; - if (G.traps) for (sig = 0; sig < NSIG; sig++) { - if (!G.traps[sig]) { + if (!G.traps && !(G.non_DFL_mask & SPECIAL_INTERACTIVE_SIGS)) + return; + + /* Stupid. It can be done with *single* &= op, but we can't use + * the fact that G.blocked_set is implemented as a bitmask... */ + mask = (SPECIAL_INTERACTIVE_SIGS >> 1); + sig = 1; + while (1) { + if (mask & 1) + sigdelset(&G.blocked_set, sig); + mask >>= 1; + if (!mask) + break; + sig++; + } + + G.non_DFL_mask &= ~SPECIAL_INTERACTIVE_SIGS; + mask = G.non_DFL_mask; + if (G.traps) for (sig = 0; sig < NSIG; sig++, mask >>= 1) { + if (!G.traps[sig]) continue; - } free(G.traps[sig]); G.traps[sig] = NULL; /* There is no signal for 0 (EXIT) */ if (sig == 0) continue; - /* there was a trap handler, we are removing it - * (if sig has non-DFL handling, - * we don't need to do anything) */ - if (sig < 32 && (G.non_DFL_mask & (1 << sig))) + /* There was a trap handler, we are removing it. + * But if sig still has non-DFL handling, + * we should not unblock it. */ + if (mask & 1) continue; sigdelset(&G.blocked_set, sig); } @@ -5740,17 +5760,8 @@ static void block_signals(int second_time) unsigned mask; mask = (1 << SIGQUIT); - if (G_interactive_fd) { - mask = 0 - | (1 << SIGQUIT) - | (1 << SIGTERM) -//TODO | (1 << SIGHUP) -#if ENABLE_HUSH_JOB - | (1 << SIGTTIN) | (1 << SIGTTOU) | (1 << SIGTSTP) -#endif - | (1 << SIGINT) - ; - } + if (G_interactive_fd) + mask = (1 << SIGQUIT) | SPECIAL_INTERACTIVE_SIGS; G.non_DFL_mask = mask; if (!second_time) |