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#include <assert.h>
#include <stdbool.h>
#include <stdio.h>
#ifndef MSWIN
# include <signal.h>
#endif
#include "nvim/autocmd.h"
#include "nvim/eval.h"
#include "nvim/event/signal.h"
#include "nvim/func_attr.h"
#include "nvim/globals.h"
#include "nvim/log.h"
#include "nvim/main.h"
#include "nvim/os/signal.h"
#ifdef SIGPWR
# include "nvim/memline.h"
#endif
static SignalWatcher spipe, shup, squit, sterm, susr1, swinch;
#ifdef SIGPWR
static SignalWatcher spwr;
#endif
static bool rejecting_deadly;
#ifdef INCLUDE_GENERATED_DECLARATIONS
# include "os/signal.c.generated.h"
#endif
void signal_init(void)
{
#ifndef MSWIN
// Ensure a clean slate by unblocking all signals. For example, if SIGCHLD is
// blocked, libuv may hang after spawning a subprocess on Linux. #5230
sigset_t mask;
sigemptyset(&mask);
if (pthread_sigmask(SIG_SETMASK, &mask, NULL) != 0) {
ELOG("Could not unblock signals, nvim might behave strangely.");
}
#endif
signal_watcher_init(&main_loop, &spipe, NULL);
signal_watcher_init(&main_loop, &shup, NULL);
signal_watcher_init(&main_loop, &squit, NULL);
signal_watcher_init(&main_loop, &sterm, NULL);
#ifdef SIGPWR
signal_watcher_init(&main_loop, &spwr, NULL);
#endif
#ifdef SIGUSR1
signal_watcher_init(&main_loop, &susr1, NULL);
#endif
#ifdef SIGWINCH
signal_watcher_init(&main_loop, &swinch, NULL);
#endif
signal_start();
}
void signal_teardown(void)
{
signal_stop();
signal_watcher_close(&spipe, NULL);
signal_watcher_close(&shup, NULL);
signal_watcher_close(&squit, NULL);
signal_watcher_close(&sterm, NULL);
#ifdef SIGPWR
signal_watcher_close(&spwr, NULL);
#endif
#ifdef SIGUSR1
signal_watcher_close(&susr1, NULL);
#endif
#ifdef SIGWINCH
signal_watcher_close(&swinch, NULL);
#endif
}
void signal_start(void)
{
#ifdef SIGPIPE
signal_watcher_start(&spipe, on_signal, SIGPIPE);
#endif
signal_watcher_start(&shup, on_signal, SIGHUP);
#ifdef SIGQUIT
signal_watcher_start(&squit, on_signal, SIGQUIT);
#endif
signal_watcher_start(&sterm, on_signal, SIGTERM);
#ifdef SIGPWR
signal_watcher_start(&spwr, on_signal, SIGPWR);
#endif
#ifdef SIGUSR1
signal_watcher_start(&susr1, on_signal, SIGUSR1);
#endif
#ifdef SIGWINCH
signal_watcher_start(&swinch, on_signal, SIGWINCH);
#endif
}
void signal_stop(void)
{
#ifdef SIGPIPE
signal_watcher_stop(&spipe);
#endif
signal_watcher_stop(&shup);
#ifdef SIGQUIT
signal_watcher_stop(&squit);
#endif
signal_watcher_stop(&sterm);
#ifdef SIGPWR
signal_watcher_stop(&spwr);
#endif
#ifdef SIGUSR1
signal_watcher_stop(&susr1);
#endif
#ifdef SIGWINCH
signal_watcher_stop(&swinch);
#endif
}
void signal_reject_deadly(void)
{
rejecting_deadly = true;
}
void signal_accept_deadly(void)
{
rejecting_deadly = false;
}
static char *signal_name(int signum)
{
switch (signum) {
#ifdef SIGPWR
case SIGPWR:
return "SIGPWR";
#endif
#ifdef SIGPIPE
case SIGPIPE:
return "SIGPIPE";
#endif
case SIGTERM:
return "SIGTERM";
#ifdef SIGQUIT
case SIGQUIT:
return "SIGQUIT";
#endif
case SIGHUP:
return "SIGHUP";
#ifdef SIGUSR1
case SIGUSR1:
return "SIGUSR1";
#endif
#ifdef SIGWINCH
case SIGWINCH:
return "SIGWINCH";
#endif
default:
return "Unknown";
}
}
// This function handles deadly signals.
// It tries to preserve any swap files and exit properly.
// (partly from Elvis).
// NOTE: this is scheduled on the event loop, not called directly from a signal handler.
static void deadly_signal(int signum)
FUNC_ATTR_NORETURN
{
// Set the v:dying variable.
set_vim_var_nr(VV_DYING, 1);
v_dying = 1;
ILOG("got signal %d (%s)", signum, signal_name(signum));
snprintf(IObuff, IOSIZE, "Vim: Caught deadly signal '%s'\r\n", signal_name(signum));
// Preserve files and exit.
preserve_exit(IObuff);
}
static void on_signal(SignalWatcher *handle, int signum, void *data)
{
assert(signum >= 0);
switch (signum) {
#ifdef SIGPWR
case SIGPWR:
// Signal of a power failure(eg batteries low), flush the swap files to
// be safe
ml_sync_all(false, false, true);
break;
#endif
#ifdef SIGPIPE
case SIGPIPE:
// Ignore
break;
#endif
case SIGTERM:
#ifdef SIGQUIT
case SIGQUIT:
#endif
case SIGHUP:
if (!rejecting_deadly) {
deadly_signal(signum);
}
break;
#ifdef SIGUSR1
case SIGUSR1:
apply_autocmds(EVENT_SIGNAL, "SIGUSR1", curbuf->b_fname, true, curbuf);
break;
#endif
#ifdef SIGWINCH
case SIGWINCH:
apply_autocmds(EVENT_SIGNAL, "SIGWINCH", curbuf->b_fname, true, curbuf);
break;
#endif
default:
ELOG("invalid signal: %d", signum);
break;
}
}
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