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efl/src/lib/ecore/ecore_signal.c

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#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <inttypes.h>
#include <stdint.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <signal.h>
#include <unistd.h>
#include <assert.h>
#include "Ecore.h"
#include "ecore_private.h"
/* make mono happy - this is evil though... */
#undef SIGPWR
/* valgrind in some versions/setups uses SIGRT's... hmmm */
typedef void (*Signal_Handler)(int sig, siginfo_t *si, void *foo);
static void _ecore_signal_callback_set(int sig,
Signal_Handler func);
static void _ecore_signal_callback_ignore(int sig,
siginfo_t *si,
void *foo);
static void _ecore_signal_callback_sigchld(int sig,
siginfo_t *si,
void *foo);
static void _ecore_signal_callback_sigusr1(int sig,
siginfo_t *si,
void *foo);
static void _ecore_signal_callback_sigusr2(int sig,
siginfo_t *si,
void *foo);
static void _ecore_signal_callback_sighup(int sig,
siginfo_t *si,
void *foo);
static void _ecore_signal_callback_sigquit(int sig,
siginfo_t *si,
void *foo);
static void _ecore_signal_callback_sigint(int sig,
siginfo_t *si,
void *foo);
static void _ecore_signal_callback_sigterm(int sig,
siginfo_t *si,
void *foo);
#ifdef SIGPWR
static void _ecore_signal_callback_sigpwr(int sig,
siginfo_t *si,
void *foo);
#endif
static Eina_Bool _ecore_signal_exe_exit_delay(void *data);
//#define MAXSIGQ 256 // 32k
#define MAXSIGQ 64 // 8k
static volatile sig_atomic_t sig_count = 0;
static volatile sig_atomic_t sigchld_count = 0;
static volatile sig_atomic_t sigusr1_count = 0;
static volatile sig_atomic_t sigusr2_count = 0;
static volatile sig_atomic_t sighup_count = 0;
static volatile sig_atomic_t sigquit_count = 0;
static volatile sig_atomic_t sigint_count = 0;
static volatile sig_atomic_t sigterm_count = 0;
#ifdef SIGPWR
static volatile sig_atomic_t sigpwr_count = 0;
#endif
static volatile siginfo_t sigchld_info[MAXSIGQ];
static volatile siginfo_t sigusr1_info[MAXSIGQ];
static volatile siginfo_t sigusr2_info[MAXSIGQ];
static volatile siginfo_t sighup_info[MAXSIGQ];
static volatile siginfo_t sigquit_info[MAXSIGQ];
static volatile siginfo_t sigint_info[MAXSIGQ];
static volatile siginfo_t sigterm_info[MAXSIGQ];
#ifdef SIGPWR
static volatile siginfo_t sigpwr_info[MAXSIGQ];
#endif
#if defined(SIG_ATOMIC_MAX)
# if SIG_ATOMIC_MAX == INT64_MAX
/* Basically FreeBSD on 64bits */
# define PRIdSIGATOMIC PRId64
# elif SIG_ATOMIC_MAX == UINT64_MAX
# define PRIdSIGATOMIC PRIu64
# elif SIG_ATOMIC_MAX == UINT32_MAX
# define PRIdSIGATOMIC PRIu32
# else
/* everybody else seems to go for int */
# define PRIdSIGATOMIC PRId32
# endif
#else
# define PRIdSIGATOMIC "d"
#endif
void
_ecore_signal_shutdown(void)
{
_ecore_signal_callback_set(SIGPIPE, (Signal_Handler)SIG_DFL);
_ecore_signal_callback_set(SIGALRM, (Signal_Handler)SIG_DFL);
// XXX: consider using new clone4 features:
// http://code.qt.io/cgit/qt/qtbase.git/tree/src/3rdparty/forkfd/forkfd.c
// https://lkml.org/lkml/2015/3/12/1060
// https://lkml.org/lkml/2015/3/12/1044
_ecore_signal_callback_set(SIGCHLD, (Signal_Handler)SIG_DFL);
_ecore_signal_callback_set(SIGUSR1, (Signal_Handler)SIG_DFL);
_ecore_signal_callback_set(SIGUSR2, (Signal_Handler)SIG_DFL);
_ecore_signal_callback_set(SIGHUP, (Signal_Handler)SIG_DFL);
_ecore_signal_callback_set(SIGQUIT, (Signal_Handler)SIG_DFL);
_ecore_signal_callback_set(SIGINT, (Signal_Handler)SIG_DFL);
_ecore_signal_callback_set(SIGTERM, (Signal_Handler)SIG_DFL);
#ifdef SIGPWR
_ecore_signal_callback_set(SIGPWR, (Signal_Handler)SIG_DFL);
sigpwr_count = 0;
#endif
sigchld_count = 0;
sigusr1_count = 0;
sigusr2_count = 0;
sighup_count = 0;
sigquit_count = 0;
sigint_count = 0;
sigterm_count = 0;
sig_count = 0;
}
void
_ecore_signal_init(void)
{
_ecore_signal_callback_set(SIGPIPE, _ecore_signal_callback_ignore);
_ecore_signal_callback_set(SIGALRM, _ecore_signal_callback_ignore);
_ecore_signal_callback_set(SIGCHLD, _ecore_signal_callback_sigchld);
_ecore_signal_callback_set(SIGUSR1, _ecore_signal_callback_sigusr1);
_ecore_signal_callback_set(SIGUSR2, _ecore_signal_callback_sigusr2);
_ecore_signal_callback_set(SIGHUP, _ecore_signal_callback_sighup);
_ecore_signal_callback_set(SIGQUIT, _ecore_signal_callback_sigquit);
_ecore_signal_callback_set(SIGINT, _ecore_signal_callback_sigint);
_ecore_signal_callback_set(SIGTERM, _ecore_signal_callback_sigterm);
#ifdef SIGPWR
_ecore_signal_callback_set(SIGPWR, _ecore_signal_callback_sigpwr);
#endif
}
void
_ecore_signal_received_process(void)
{
while (_ecore_signal_count_get()) _ecore_signal_call();
}
int
_ecore_signal_count_get(void)
{
return sig_count;
}
static void
_ecore_signal_generic_free(void *data EINA_UNUSED,
void *event)
{
free(event);
}
void
_ecore_signal_call(void)
{
volatile sig_atomic_t n;
sigset_t oldset, newset;
int tot;
if (sig_count == 0) return;
eina_evlog("+signals", NULL, 0.0, NULL);
sigemptyset(&newset);
sigaddset(&newset, SIGPIPE);
sigaddset(&newset, SIGALRM);
sigaddset(&newset, SIGCHLD);
sigaddset(&newset, SIGUSR1);
sigaddset(&newset, SIGUSR2);
sigaddset(&newset, SIGHUP);
sigaddset(&newset, SIGQUIT);
sigaddset(&newset, SIGINT);
sigaddset(&newset, SIGTERM);
#ifdef SIGPWR
sigaddset(&newset, SIGPWR);
#endif
sigprocmask(SIG_BLOCK, &newset, &oldset);
if (sigchld_count > MAXSIGQ)
WRN("%"PRIdSIGATOMIC" SIGCHLD in queue. max queue size %i. losing "
"siginfo for extra signals.", sigchld_count, MAXSIGQ);
tot = sigchld_count + sigusr1_count + sigusr2_count +
sighup_count + sigquit_count + sigint_count + sigterm_count
#ifdef SIGPWR
+ sigpwr_count
#endif
;
if (sig_count != tot)
{
ERR("sig_count (%"PRIdSIGATOMIC") != actual totals (%i) ",
sig_count, tot);
sig_count = tot;
}
for (n = 0; n < sigchld_count; n++)
{
pid_t pid;
int status;
while ((pid = waitpid(-1, &status, WNOHANG)) > 0)
{
Ecore_Exe_Event_Del *e;
/* FIXME: If this process is set respawn, respawn with a suitable backoff
* period for those that need too much respawning.
*/
e = _ecore_exe_event_del_new();
if (e)
{
if (WIFEXITED(status))
{
e->exit_code = WEXITSTATUS(status);
e->exited = 1;
}
else if (WIFSIGNALED(status))
{
e->exit_signal = WTERMSIG(status);
e->signalled = 1;
}
e->pid = pid;
e->exe = _ecore_exe_find(pid);
if ((n < MAXSIGQ) && (sigchld_info[n].si_signo))
e->data = sigchld_info[n]; /* No need to clone this. */
if ((e->exe) && (ecore_exe_flags_get(e->exe) & (ECORE_EXE_PIPE_READ | ECORE_EXE_PIPE_ERROR)))
{
/* We want to report the Last Words of the exe, so delay this event.
* This is twice as relevant for stderr.
* There are three possibilities here -
* 1 There are no Last Words.
* 2 There are Last Words, they are not ready to be read.
* 3 There are Last Words, they are ready to be read.
*
* For 1 we don't want to delay, for 3 we want to delay.
* 2 is the problem. If we check for data now and there
* is none, then there is no way to differentiate 1 and 2.
* If we don't delay, we may loose data, but if we do delay,
* there may not be data and the exit event never gets sent.
*
* Any way you look at it, there has to be some time passed
* before the exit event gets sent. So the strategy here is
* to setup a timer event that will send the exit event after
* an arbitrary, but brief, time.
*
* This is probably paranoid, for the less paraniod, we could
* check to see for Last Words, and only delay if there are any.
* This has it's own set of problems.
*/
Ecore_Timer *doomsday_clock;
doomsday_clock = _ecore_exe_doomsday_clock_get(e->exe);
IF_FN_DEL(ecore_timer_del, doomsday_clock);
doomsday_clock = ecore_timer_add
(0.1, _ecore_signal_exe_exit_delay, e);
_ecore_exe_doomsday_clock_set(e->exe, doomsday_clock);
}
else
{
_ecore_event_add(ECORE_EXE_EVENT_DEL, e,
_ecore_exe_event_del_free, NULL);
}
}
}
sig_count--;
}
sigchld_count = 0;
if (sigusr1_count > MAXSIGQ)
WRN("%"PRIdSIGATOMIC" SIGUSR1 in queue. max queue size %i. losing "
"siginfo for extra signals.", sigusr1_count, MAXSIGQ);
for (n = 0; n < sigusr1_count; n++)
{
Ecore_Event_Signal_User *e;
e = _ecore_event_signal_user_new();
if (e)
{
e->number = 1;
if ((n < MAXSIGQ) && (sigusr1_info[n].si_signo))
e->data = sigusr1_info[n];
_ecore_event_add(ECORE_EVENT_SIGNAL_USER, e,
_ecore_signal_generic_free, NULL);
}
sig_count--;
}
sigusr1_count = 0;
if (sigusr2_count > MAXSIGQ)
WRN("%"PRIdSIGATOMIC" SIGUSR2 in queue. max queue size %i. losing "
"siginfo for extra signals.", sigusr2_count, MAXSIGQ);
for (n = 0; n < sigusr2_count; n++)
{
Ecore_Event_Signal_User *e;
e = _ecore_event_signal_user_new();
if (e)
{
e->number = 2;
if ((n < MAXSIGQ) && (sigusr2_info[n].si_signo))
e->data = sigusr2_info[n];
_ecore_event_add(ECORE_EVENT_SIGNAL_USER, e,
_ecore_signal_generic_free, NULL);
}
sig_count--;
}
sigusr2_count = 0;
if (sighup_count > MAXSIGQ)
WRN("%"PRIdSIGATOMIC" SIGHUP in queue. max queue size %i. losing "
"siginfo for extra signals.", sighup_count, MAXSIGQ);
for (n = 0; n < sighup_count; n++)
{
Ecore_Event_Signal_Hup *e;
e = _ecore_event_signal_hup_new();
if (e)
{
if ((n < MAXSIGQ) && (sighup_info[n].si_signo))
e->data = sighup_info[n];
_ecore_event_add(ECORE_EVENT_SIGNAL_HUP, e,
_ecore_signal_generic_free, NULL);
}
sig_count--;
}
sighup_count = 0;
if (sigquit_count > MAXSIGQ)
WRN("%"PRIdSIGATOMIC" SIGQUIT in queue. max queue size %i. losing "
"siginfo for extra signals.", sigquit_count, MAXSIGQ);
for (n = 0; n < sigquit_count; n++)
{
Ecore_Event_Signal_Exit *e;
e = _ecore_event_signal_exit_new();
if (e)
{
e->quit = 1;
if ((n < MAXSIGQ) && (sigquit_info[n].si_signo))
e->data = sigquit_info[n];
_ecore_event_add(ECORE_EVENT_SIGNAL_EXIT, e,
_ecore_signal_generic_free, NULL);
}
sig_count--;
}
sigquit_count = 0;
if (sigint_count > MAXSIGQ)
WRN("%"PRIdSIGATOMIC" SIGINT in queue. max queue size %i. losing "
"siginfo for extra signals.", sigint_count, MAXSIGQ);
for (n = 0; n < sigint_count; n++)
{
Ecore_Event_Signal_Exit *e;
e = _ecore_event_signal_exit_new();
if (e)
{
e->interrupt = 1;
if ((n < MAXSIGQ) && (sigint_info[n].si_signo))
e->data = sigint_info[n];
_ecore_event_add(ECORE_EVENT_SIGNAL_EXIT, e,
_ecore_signal_generic_free, NULL);
}
sig_count--;
}
sigint_count = 0;
if (sigterm_count > MAXSIGQ)
WRN("%"PRIdSIGATOMIC" SIGTERM in queue. max queue size %i. losing "
"siginfo for extra signals.", sigterm_count, MAXSIGQ);
for (n = 0; n < sigterm_count; n++)
{
Ecore_Event_Signal_Exit *e;
e = _ecore_event_signal_exit_new();
if (e)
{
e->terminate = 1;
if ((n < MAXSIGQ) && (sigterm_info[n].si_signo))
e->data = sigterm_info[n];
_ecore_event_add(ECORE_EVENT_SIGNAL_EXIT, e,
_ecore_signal_generic_free, NULL);
}
sig_count--;
}
sigterm_count = 0;
#ifdef SIGPWR
if (sigpwr_count > MAXSIGQ)
WRN("%"PRIdSIGATOMIC" SIGPWR in queue. max queue size %i. losing "
"siginfo for extra signals.", sigpwr_count, MAXSIGQ);
for (n = 0; n < sigpwr_count; n++)
{
Ecore_Event_Signal_Power *e;
e = _ecore_event_signal_power_new();
if (e)
{
if ((n < MAXSIGQ) && (sigpwr_info[n].si_signo))
e->data = sigpwr_info[n];
_ecore_event_add(ECORE_EVENT_SIGNAL_POWER, e,
_ecore_signal_generic_free, NULL);
}
sig_count--;
}
sigpwr_count = 0;
#endif
sig_count = 0;
sigprocmask(SIG_SETMASK, &oldset, NULL);
eina_evlog("-signals", NULL, 0.0, NULL);
}
static void
_ecore_signal_callback_set(int sig,
Signal_Handler func)
{
struct sigaction sa;
sa.sa_sigaction = func;
sa.sa_flags = SA_RESTART | SA_SIGINFO;
sigemptyset(&sa.sa_mask);
sigaction(sig, &sa, NULL);
}
static void
_ecore_signal_callback_ignore(int sig EINA_UNUSED,
siginfo_t *si EINA_UNUSED,
void *foo EINA_UNUSED)
{
}
static void
_ecore_signal_callback_sigchld(int sig EINA_UNUSED,
siginfo_t *si,
void *foo EINA_UNUSED)
{
volatile sig_atomic_t n;
n = sigchld_count;
if (n < MAXSIGQ)
{
if (si)
sigchld_info[n] = *si;
else
sigchld_info[n].si_signo = 0;
}
sigchld_count++;
sig_count++;
}
static void
_ecore_signal_callback_sigusr1(int sig EINA_UNUSED,
siginfo_t *si,
void *foo EINA_UNUSED)
{
volatile sig_atomic_t n;
n = sigusr1_count;
if (n < MAXSIGQ)
{
if (si)
sigusr1_info[n] = *si;
else
sigusr1_info[n].si_signo = 0;
}
sigusr1_count++;
sig_count++;
}
static void
_ecore_signal_callback_sigusr2(int sig EINA_UNUSED,
siginfo_t *si,
void *foo EINA_UNUSED)
{
volatile sig_atomic_t n;
n = sigusr2_count;
if (n < MAXSIGQ)
{
if (si)
sigusr2_info[n] = *si;
else
sigusr2_info[n].si_signo = 0;
}
sigusr2_count++;
sig_count++;
}
static void
_ecore_signal_callback_sighup(int sig EINA_UNUSED,
siginfo_t *si,
void *foo EINA_UNUSED)
{
volatile sig_atomic_t n;
n = sighup_count;
if (n < MAXSIGQ)
{
if (si)
sighup_info[n] = *si;
else
sighup_info[n].si_signo = 0;
}
sighup_count++;
sig_count++;
}
static void
_ecore_signal_callback_sigquit(int sig EINA_UNUSED,
siginfo_t *si,
void *foo EINA_UNUSED)
{
volatile sig_atomic_t n;
n = sigquit_count;
if (n < MAXSIGQ)
{
if (si)
sigquit_info[n] = *si;
else
sigquit_info[n].si_signo = 0;
}
sigquit_count++;
sig_count++;
}
static void
_ecore_signal_callback_sigint(int sig EINA_UNUSED,
siginfo_t *si,
void *foo EINA_UNUSED)
{
volatile sig_atomic_t n;
n = sigint_count;
if (n < MAXSIGQ)
{
if (si)
sigint_info[n] = *si;
else
sigint_info[n].si_signo = 0;
}
sigint_count++;
sig_count++;
}
static void
_ecore_signal_callback_sigterm(int sig EINA_UNUSED,
siginfo_t *si,
void *foo EINA_UNUSED)
{
volatile sig_atomic_t n;
n = sigterm_count;
if (n < MAXSIGQ)
{
if (si)
sigterm_info[n] = *si;
else
sigterm_info[n].si_signo = 0;
}
sigterm_count++;
sig_count++;
}
#ifdef SIGPWR
static void
_ecore_signal_callback_sigpwr(int sig EINA_UNUSED,
siginfo_t *si,
void *foo EINA_UNUSED)
{
volatile sig_atomic_t n;
n = sigpwr_count;
if (n < MAXSIGQ)
{
if (si)
sigpwr_info[n] = *si;
else
sigpwr_info[n].si_signo = 0;
}
sigpwr_count++;
sig_count++;
}
#endif
static Eina_Bool
_ecore_signal_exe_exit_delay(void *data)
{
Ecore_Exe_Event_Del *e;
e = data;
if (e)
{
_ecore_exe_doomsday_clock_set(e->exe, NULL);
_ecore_event_add(ECORE_EXE_EVENT_DEL, e,
_ecore_exe_event_del_free, NULL);
}
return ECORE_CALLBACK_CANCEL;
}
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