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ash: fix bug which causes signal6.tests to fail

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function                                             old     new   delta
trapcmd                                              271     277      +6
localcmd                                             277     275      -2

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2010-05-18 15:49:07 +02:00
parent 51b4a9e2f1
commit 238bf187ba
3 changed files with 16 additions and 9 deletions
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20
shell/ash.c
View File

@ -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;
@ -8443,11 +8445,12 @@ 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)
@ -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);

1
shell/ash_test/ash-signals/signal6.tests
View File

@ -1,3 +1,2 @@
# Bug: TERM does not trigger in the child
{ trap "echo got TERM" TERM; sleep 3; }& sleep 1; kill $!; wait
echo Done: $?