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[project @ 2006-01-06 00:57:01 by jmb]

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Handle previous signal handler claimants correctly

svn path=/import/netsurf/; revision=1987
This commit is contained in:
John Mark Bell 2006-01-06 00:57:01 +00:00
parent ca339fcc4d
commit 71a9ffa7db
1 changed files with 63 additions and 7 deletions
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70
riscos/gui.c
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@ -143,6 +143,16 @@ wimp_t task_handle; /**< RISC OS wimp task handle. */
static clock_t gui_last_poll; /**< Time of last wimp_poll. */
osspriteop_area *gui_sprites; /**< Sprite area containing pointer and hotlist sprites */
/** Previously registered signal handlers */
static struct {
void (*sigabrt)(int);
void (*sigfpe)(int);
void (*sigill)(int);
void (*sigint)(int);
void (*sigsegv)(int);
void (*sigterm)(int);
} prev_sigs;
/** Accepted wimp user messages. */
static wimp_MESSAGE_LIST(38) task_messages = { {
message_HELP_REQUEST,
@ -250,12 +260,19 @@ void gui_init(int argc, char** argv)
xos_byte(osbyte_IN_KEY, 0, 0xff, &os_version, NULL);
atexit(ro_gui_cleanup);
signal(SIGABRT, ro_gui_signal);
signal(SIGFPE, ro_gui_signal);
signal(SIGILL, ro_gui_signal);
signal(SIGINT, ro_gui_signal);
signal(SIGSEGV, ro_gui_signal);
signal(SIGTERM, ro_gui_signal);
prev_sigs.sigabrt = signal(SIGABRT, ro_gui_signal);
prev_sigs.sigfpe = signal(SIGFPE, ro_gui_signal);
prev_sigs.sigill = signal(SIGILL, ro_gui_signal);
prev_sigs.sigint = signal(SIGINT, ro_gui_signal);
prev_sigs.sigsegv = signal(SIGSEGV, ro_gui_signal);
prev_sigs.sigterm = signal(SIGTERM, ro_gui_signal);
if (prev_sigs.sigabrt == SIG_ERR || prev_sigs.sigfpe == SIG_ERR ||
prev_sigs.sigill == SIG_ERR ||
prev_sigs.sigint == SIG_ERR ||
prev_sigs.sigsegv == SIG_ERR ||
prev_sigs.sigterm == SIG_ERR)
die("Failed registering signal handlers");
/* create our choices directories */
#ifndef ncos
@ -583,6 +600,8 @@ void gui_quit(void)
void ro_gui_signal(int sig)
{
struct content *c;
void (*prev_handler)(int);
if (sig == SIGFPE || sig == SIGABRT) {
os_colour old_sand, old_glass;
@ -599,7 +618,44 @@ void ro_gui_signal(int sig)
xhourglass_off();
}
ro_gui_cleanup();
raise(sig);
/* Get previous handler of this signal */
switch (sig) {
case SIGABRT:
prev_handler = prev_sigs.sigabrt;
break;
case SIGFPE:
prev_handler = prev_sigs.sigfpe;
break;
case SIGILL:
prev_handler = prev_sigs.sigill;
break;
case SIGINT:
prev_handler = prev_sigs.sigint;
break;
case SIGSEGV:
prev_handler = prev_sigs.sigsegv;
break;
case SIGTERM:
prev_handler = prev_sigs.sigterm;
break;
default:
abort();
}
if (prev_handler != SIG_IGN && prev_handler != SIG_DFL) {
/* User-registered handler, so call it direct */
prev_handler(sig);
} else if (prev_handler == SIG_DFL) {
/* Default handler so set handler to that and raise() */
prev_handler = signal(sig, SIG_DFL);
if (prev_handler == SIG_ERR)
abort();
raise(sig);
}
/* If we reach here, previous handler was either SIG_IGN or
* the user-defined handler returned. In either case, we have
* nothing to do */
}