diff options
Diffstat (limited to 'shell/ash.c')
| -rw-r--r-- | shell/ash.c | 22 |
1 files changed, 15 insertions, 7 deletions
diff --git a/shell/ash.c b/shell/ash.c index 641a14035..4f2fa756b 100644 --- a/shell/ash.c +++ b/shell/ash.c @@ -208,6 +208,7 @@ struct globals_misc { /* indicates specified signal received */ uint8_t gotsig[NSIG - 1]; /* offset by 1: "signal" 0 is meaningless */ + uint8_t may_have_traps; /* 0: definitely no traps are set, 1: some traps may be set */ char *trap[NSIG]; char **trap_ptr; /* used only by "trap hack" */ @@ -236,6 +237,7 @@ extern struct globals_misc *const ash_ptr_to_globals_misc; #define optlist (G_misc.optlist ) #define sigmode (G_misc.sigmode ) #define gotsig (G_misc.gotsig ) +#define may_have_traps (G_misc.may_have_traps ) #define trap (G_misc.trap ) #define trap_ptr (G_misc.trap_ptr ) #define random_gen (G_misc.random_gen ) @@ -333,7 +335,7 @@ raise_interrupt(void) /* Signal is not automatically unmasked after it is raised, * do it ourself - unmask all signals */ sigprocmask_allsigs(SIG_UNBLOCK); - /* pending_sig = 0; - now done in onsig() */ + /* pending_sig = 0; - now done in signal_handler() */ ex_type = EXSIG; if (gotsig[SIGINT - 1] && !trap[SIGINT]) { @@ -3268,10 +3270,10 @@ ignoresig(int signo) } /* - * Signal handler. Only one usage site - in setsignal() + * Only one usage site - in setsignal() */ static void -onsig(int signo) +signal_handler(int signo) { gotsig[signo - 1] = 1; @@ -3366,7 +3368,7 @@ setsignal(int signo) act.sa_handler = SIG_DFL; switch (new_act) { case S_CATCH: - act.sa_handler = onsig; + act.sa_handler = signal_handler; act.sa_flags = 0; /* matters only if !DFL and !IGN */ sigfillset(&act.sa_mask); /* ditto */ break; @@ -8443,15 +8445,16 @@ evalsubshell(union node *n, int flags) int status; expredir(n->nredir.redirect); - if (!backgnd && flags & EV_EXIT && !trap[0]) + if (!backgnd && (flags & EV_EXIT) && !may_have_traps) goto nofork; INT_OFF; jp = makejob(/*n,*/ 1); if (forkshell(jp, n, backgnd) == 0) { + /* child */ INT_ON; flags |= EV_EXIT; if (backgnd) - flags &=~ EV_TESTED; + flags &= ~EV_TESTED; nofork: redirect(n->nredir.redirect, 0); evaltreenr(n->nredir.n, flags); @@ -9193,16 +9196,19 @@ evalcommand(union node *cmd, int flags) } #endif /* Fork off a child process if necessary. */ - if (!(flags & EV_EXIT) || trap[0]) { + if (!(flags & EV_EXIT) || may_have_traps) { INT_OFF; jp = makejob(/*cmd,*/ 1); if (forkshell(jp, cmd, FORK_FG) != 0) { + /* parent */ exitstatus = waitforjob(jp); INT_ON; TRACE(("forked child exited with %d\n", exitstatus)); break; } + /* child */ FORCE_INT_ON; + /* fall through to exec'ing exeternal program */ } listsetvar(varlist.list, VEXPORT|VSTACK); shellexec(argv, path, cmdentry.u.index); @@ -12349,6 +12355,8 @@ trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) action = ckstrdup(action); } free(trap[signo]); + if (action) + may_have_traps = 1; trap[signo] = action; if (signo != 0) setsignal(signo); |