static void
smp_sig_notify(int signum)
{
int res;
do {
/* write() is async-signal safe (according to posix) */
res = write(sig_notify_fds[1], &signum, sizeof(int));
} while (res < 0 && errno == EINTR);
if (res != sizeof(int)) {
char msg[] =
"smp_sig_notify(): Failed to notify signal-dispatcher thread "
"about received signal";
erts_silence_warn_unused_result(write(2, msg, sizeof(msg)));
abort();
}
}
static ERTS_INLINE int
prepare_crash_dump(int secs)
{
#define NUFBUF (3)
int i;
char env[21]; /* enough to hold any 64-bit integer */
size_t envsz;
DeclareTmpHeapNoproc(heap,NUFBUF);
Port *heart_port;
Eterm *hp = heap;
Eterm list = NIL;
int has_heart = 0;
UseTmpHeapNoproc(NUFBUF);
if (ERTS_PREPARED_CRASH_DUMP)
return 0; /* We have already been called */
heart_port = erts_get_heart_port();
/* Positive secs means an alarm must be set
* 0 or negative means no alarm
*
* Set alarm before we try to write to a port
* we don't want to hang on a port write with
* no alarm.
*
*/
if (secs >= 0) {
alarm((unsigned int)secs);
}
/* close all viable sockets via emergency close callbacks.
* Specifically we want to close epmd sockets.
*/
erts_emergency_close_ports();
if (heart_port) {
has_heart = 1;
list = CONS(hp, make_small(8), list); hp += 2;
/* send to heart port, CMD = 8, i.e. prepare crash dump =o */
erts_port_output(NULL, ERTS_PORT_SIG_FLG_FORCE_IMM_CALL, heart_port,
heart_port->common.id, list, NULL);
}
/* Make sure we have a fd for our crashdump file. */
close(crashdump_companion_cube_fd);
envsz = sizeof(env);
i = erts_sys_getenv__("ERL_CRASH_DUMP_NICE", env, &envsz);
if (i >= 0) {
int nice_val;
nice_val = i != 0 ? 0 : atoi(env);
if (nice_val > 39) {
nice_val = 39;
}
erts_silence_warn_unused_result(nice(nice_val));
}
UnUseTmpHeapNoproc(NUFBUF);
#undef NUFBUF
return has_heart;
}