aboutsummaryrefslogtreecommitdiffstats
path: root/erts/emulator/sys/unix/sys.c
diff options
context:
space:
mode:
Diffstat (limited to 'erts/emulator/sys/unix/sys.c')
-rw-r--r--erts/emulator/sys/unix/sys.c201
1 files changed, 117 insertions, 84 deletions
diff --git a/erts/emulator/sys/unix/sys.c b/erts/emulator/sys/unix/sys.c
index 47acd132ca..6248651882 100644
--- a/erts/emulator/sys/unix/sys.c
+++ b/erts/emulator/sys/unix/sys.c
@@ -224,10 +224,15 @@ static erts_smp_atomic_t sys_misc_mem_sz;
#if defined(ERTS_SMP)
static void smp_sig_notify(char c);
static int sig_notify_fds[2] = {-1, -1};
+
+static int sig_suspend_fds[2] = {-1, -1};
+#define ERTS_SYS_SUSPEND_SIGNAL SIGUSR2
#elif defined(USE_THREADS)
static int async_fd[2];
#endif
+jmp_buf erts_sys_sigsegv_jmp;
+
#if CHLDWTHR || defined(ERTS_SMP)
erts_mtx_t chld_stat_mtx;
#endif
@@ -654,39 +659,7 @@ erl_sys_init(void)
/* signal handling */
-#ifdef SIG_SIGSET /* Old SysV */
-RETSIGTYPE (*sys_sigset(sig, func))()
-int sig;
-RETSIGTYPE (*func)();
-{
- return(sigset(sig, func));
-}
-void sys_sigblock(int sig)
-{
- sighold(sig);
-}
-void sys_sigrelease(int sig)
-{
- sigrelse(sig);
-}
-#else /* !SIG_SIGSET */
-#ifdef SIG_SIGNAL /* Old BSD */
-RETSIGTYPE (*sys_sigset(sig, func))(int, int)
-int sig;
-RETSIGTYPE (*func)();
-{
- return(signal(sig, func));
-}
-sys_sigblock(int sig)
-{
- sigblock(sig);
-}
-sys_sigrelease(int sig)
-{
- sigsetmask(sigblock(0) & ~sigmask(sig));
-}
-#else /* !SIG_SIGNAL */ /* The True Way - POSIX!:-) */
-RETSIGTYPE (*sys_sigset(int sig, RETSIGTYPE (*func)(int)))(int)
+SIGFUNC sys_signal(int sig, SIGFUNC func)
{
struct sigaction act, oact;
@@ -719,23 +692,35 @@ void sys_sigrelease(int sig)
sigaddset(&mask, sig);
sigprocmask(SIG_UNBLOCK, &mask, (sigset_t *)NULL);
}
-#endif /* !SIG_SIGNAL */
-#endif /* !SIG_SIGSET */
-#if (0) /* not used? -- gordon */
-static void (*break_func)();
-static RETSIGTYPE break_handler(int sig)
-{
-#ifdef QNX
- /* Turn off SIGCHLD during break processing */
- sys_sigblock(SIGCHLD);
-#endif
- (*break_func)();
-#ifdef QNX
- sys_sigrelease(SIGCHLD);
-#endif
+void erts_sys_sigsegv_handler(int signo) {
+ if (signo == SIGSEGV) {
+ longjmp(erts_sys_sigsegv_jmp, 1);
+ }
+}
+
+/*
+ * Function returns 1 if we can read from all values in between
+ * start and stop.
+ */
+int
+erts_sys_is_area_readable(char *start, char *stop) {
+ int fds[2];
+ if (!pipe(fds)) {
+ /* We let write try to figure out if the pointers are readable */
+ int res = write(fds[1], start, (char*)stop - (char*)start);
+ if (res == -1) {
+ close(fds[0]);
+ close(fds[1]);
+ return 0;
+ }
+ close(fds[0]);
+ close(fds[1]);
+ return 1;
+ }
+ return 0;
+
}
-#endif /* 0 */
static ERTS_INLINE int
prepare_crash_dump(int secs)
@@ -797,6 +782,9 @@ prepare_crash_dump(int secs)
/* We don't want to close the signal notification pipe... */
if (i == sig_notify_fds[0] || i == sig_notify_fds[1])
continue;
+ /* We don't want to close the signal syspend pipe... */
+ if (i == sig_suspend_fds[0] || i == sig_suspend_fds[1])
+ continue;
#elif defined(USE_THREADS)
/* We don't want to close the async notification pipe... */
if (i == async_fd[0] || i == async_fd[1])
@@ -885,9 +873,23 @@ sigusr1_exit(void)
#ifdef ETHR_UNUSABLE_SIGUSRX
#warning "Unusable SIGUSR1 & SIGUSR2. Disabling use of these signals"
-#endif
-#ifndef ETHR_UNUSABLE_SIGUSRX
+#else
+
+#ifdef ERTS_SMP
+void
+sys_thr_suspend(erts_tid_t tid) {
+ erts_thr_kill(tid, ERTS_SYS_SUSPEND_SIGNAL);
+}
+
+void
+sys_thr_resume(erts_tid_t tid) {
+ int i = 0, res;
+ do {
+ res = write(sig_suspend_fds[1],&i,sizeof(i));
+ } while (res < 0 && errno == EAGAIN);
+}
+#endif
#if (defined(SIG_SIGSET) || defined(SIG_SIGNAL))
static RETSIGTYPE user_signal1(void)
@@ -902,20 +904,20 @@ static RETSIGTYPE user_signal1(int signum)
#endif
}
-#ifdef QUANTIFY
+#ifdef ERTS_SMP
#if (defined(SIG_SIGSET) || defined(SIG_SIGNAL))
-static RETSIGTYPE user_signal2(void)
+static RETSIGTYPE suspend_signal(void)
#else
-static RETSIGTYPE user_signal2(int signum)
+static RETSIGTYPE suspend_signal(int signum)
#endif
{
-#ifdef ERTS_SMP
- smp_sig_notify('2');
-#else
- quantify_save_data();
-#endif
+ int res;
+ int buf[1];
+ do {
+ res = read(sig_suspend_fds[0], buf, sizeof(int));
+ } while (res < 0 && errno == EINTR);
}
-#endif
+#endif /* #ifdef ERTS_SMP */
#endif /* #ifndef ETHR_UNUSABLE_SIGUSRX */
@@ -940,9 +942,9 @@ static RETSIGTYPE do_quit(int signum)
/* Disable break */
void erts_set_ignore_break(void) {
- sys_sigset(SIGINT, SIG_IGN);
- sys_sigset(SIGQUIT, SIG_IGN);
- sys_sigset(SIGTSTP, SIG_IGN);
+ sys_signal(SIGINT, SIG_IGN);
+ sys_signal(SIGQUIT, SIG_IGN);
+ sys_signal(SIGTSTP, SIG_IGN);
}
/* Don't use ctrl-c for break handler but let it be
@@ -965,14 +967,14 @@ void erts_replace_intr(void) {
void init_break_handler(void)
{
- sys_sigset(SIGINT, request_break);
+ sys_signal(SIGINT, request_break);
#ifndef ETHR_UNUSABLE_SIGUSRX
- sys_sigset(SIGUSR1, user_signal1);
-#ifdef QUANTIFY
- sys_sigset(SIGUSR2, user_signal2);
-#endif
+ sys_signal(SIGUSR1, user_signal1);
+#ifdef ERTS_SMP
+ sys_signal(ERTS_SYS_SUSPEND_SIGNAL, suspend_signal);
+#endif /* #ifdef ERTS_SMP */
#endif /* #ifndef ETHR_UNUSABLE_SIGUSRX */
- sys_sigset(SIGQUIT, do_quit);
+ sys_signal(SIGQUIT, do_quit);
}
int sys_max_files(void)
@@ -989,8 +991,13 @@ static void block_signals(void)
sys_sigblock(SIGINT);
#ifndef ETHR_UNUSABLE_SIGUSRX
sys_sigblock(SIGUSR1);
+#endif /* #ifndef ETHR_UNUSABLE_SIGUSRX */
+#endif /* #ifndef ERTS_SMP */
+
+#if defined(ERTS_SMP) && !defined(ETHR_UNUSABLE_SIGUSRX)
+ sys_sigblock(ERTS_SYS_SUSPEND_SIGNAL);
#endif
-#endif
+
}
static void unblock_signals(void)
@@ -1004,8 +1011,14 @@ static void unblock_signals(void)
#ifndef ETHR_UNUSABLE_SIGUSRX
sys_sigrelease(SIGUSR1);
#endif /* #ifndef ETHR_UNUSABLE_SIGUSRX */
+#endif /* #ifndef ERTS_SMP */
+
+#if defined(ERTS_SMP) && !defined(ETHR_UNUSABLE_SIGUSRX)
+ sys_sigrelease(ERTS_SYS_SUSPEND_SIGNAL);
#endif
+
}
+
/************************** Time stuff **************************/
#ifdef HAVE_GETHRTIME
#ifdef GETHRTIME_WITH_CLOCK_GETTIME
@@ -1335,9 +1348,10 @@ static int spawn_init()
thr_opts.detached = 0;
thr_opts.suggested_stack_size = 0; /* Smallest possible */
+ thr_opts.name = "child_waiter";
#endif
- sys_sigset(SIGPIPE, SIG_IGN); /* Ignore - we'll handle the write failure */
+ sys_signal(SIGPIPE, SIG_IGN); /* Ignore - we'll handle the write failure */
driver_data = (struct driver_data *)
erts_alloc(ERTS_ALC_T_DRV_TAB, max_files * sizeof(struct driver_data));
erts_smp_atomic_add_nob(&sys_misc_mem_sz,
@@ -1350,7 +1364,7 @@ static int spawn_init()
sys_sigblock(SIGCHLD);
#endif
- sys_sigset(SIGCHLD, onchld); /* Reap children */
+ sys_signal(SIGCHLD, onchld); /* Reap children */
#if CHLDWTHR
erts_thr_create(&child_waiter_tid, child_waiter, NULL, &thr_opts);
@@ -3210,13 +3224,6 @@ signal_dispatcher_thread_func(void *unused)
case '1': /* SIGUSR1 */
sigusr1_exit();
break;
-#ifdef QUANTIFY
- case '2': /* SIGUSR2 */
- quantify_save_data(); /* Might take a substantial amount of
- time, but this is a test/debug
- build */
- break;
-#endif
default:
erl_exit(ERTS_ABORT_EXIT,
"signal-dispatcher thread received unknown "
@@ -3234,6 +3241,7 @@ init_smp_sig_notify(void)
{
erts_smp_thr_opts_t thr_opts = ERTS_SMP_THR_OPTS_DEFAULT_INITER;
thr_opts.detached = 1;
+ thr_opts.name = "sys_sig_dispatcher";
if (pipe(sig_notify_fds) < 0) {
erl_exit(ERTS_ABORT_EXIT,
@@ -3248,6 +3256,17 @@ init_smp_sig_notify(void)
NULL,
&thr_opts);
}
+
+static void
+init_smp_sig_suspend(void) {
+ if (pipe(sig_suspend_fds) < 0) {
+ erl_exit(ERTS_ABORT_EXIT,
+ "Failed to create sig_suspend pipe: %s (%d)\n",
+ erl_errno_id(errno),
+ errno);
+ }
+}
+
#ifdef __DARWIN__
int erts_darwin_main_thread_pipe[2];
@@ -3275,9 +3294,11 @@ erts_sys_main_thread(void)
#endif
smp_sig_notify(0); /* Notify initialized */
- while (1) {
- /* Wait for a signal to arrive... */
+
+ /* Wait for a signal to arrive... */
+
#ifdef __DARWIN__
+ while (1) {
/*
* The wx driver needs to be able to steal the main thread for Cocoa to
* work properly.
@@ -3292,12 +3313,24 @@ erts_sys_main_thread(void)
void* (*func)(void*);
void* arg;
void *resp;
- read(erts_darwin_main_thread_pipe[0],&func,sizeof(void* (*)(void*)));
- read(erts_darwin_main_thread_pipe[0],&arg, sizeof(void*));
+ res = read(erts_darwin_main_thread_pipe[0],&func,sizeof(void* (*)(void*)));
+ if (res != sizeof(void* (*)(void*)))
+ break;
+ res = read(erts_darwin_main_thread_pipe[0],&arg,sizeof(void*));
+ if (res != sizeof(void*))
+ break;
resp = (*func)(arg);
write(erts_darwin_main_thread_result_pipe[1],&resp,sizeof(void *));
}
-#else
+
+ if (res == -1 && errno != EINTR)
+ break;
+ }
+ /* Something broke with the main thread pipe, so we ignore it for now.
+ Most probably erts has closed this pipe and is about to exit. */
+#endif /* #ifdef __DARWIN__ */
+
+ while (1) {
#ifdef DEBUG
int res =
#else
@@ -3306,7 +3339,6 @@ erts_sys_main_thread(void)
select(0, NULL, NULL, NULL, NULL);
ASSERT(res < 0);
ASSERT(errno == EINTR);
-#endif
}
}
@@ -3398,6 +3430,7 @@ erl_sys_args(int* argc, char** argv)
#ifdef ERTS_SMP
init_smp_sig_notify();
+ init_smp_sig_suspend();
#endif
/* Handled arguments have been marked with NULL. Slide arguments
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-01 21:17:29 +0000