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#include <assert.h>
#include <stdbool.h>
#include <uv.h>
#include "nvim/ascii.h"
#include "nvim/vim.h"
#include "nvim/globals.h"
#include "nvim/memline.h"
#include "nvim/eval.h"
#include "nvim/memory.h"
#include "nvim/misc1.h"
#include "nvim/misc2.h"
#include "nvim/event/signal.h"
#include "nvim/os/signal.h"
#include "nvim/event/loop.h"
static SignalWatcher spipe, shup, squit, sterm;
#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)
{
signal_watcher_init(&loop, &spipe, NULL);
signal_watcher_init(&loop, &shup, NULL);
signal_watcher_init(&loop, &squit, NULL);
signal_watcher_init(&loop, &sterm, NULL);
signal_watcher_start(&spipe, on_signal, SIGPIPE);
signal_watcher_start(&shup, on_signal, SIGHUP);
signal_watcher_start(&squit, on_signal, SIGQUIT);
signal_watcher_start(&sterm, on_signal, SIGTERM);
#ifdef SIGPWR
signal_watcher_init(&loop, &spwr, NULL);
signal_watcher_start(&spwr, on_signal, SIGPWR);
#endif
}
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
}
void signal_stop(void)
{
signal_watcher_stop(&spipe);
signal_watcher_stop(&shup);
signal_watcher_stop(&squit);
signal_watcher_stop(&sterm);
#ifdef SIGPWR
signal_watcher_stop(&spwr);
#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
case SIGPIPE:
return "SIGPIPE";
case SIGTERM:
return "SIGTERM";
case SIGQUIT:
return "SIGQUIT";
case SIGHUP:
return "SIGHUP";
default:
return "Unknown";
}
}
// This function handles deadly signals.
// It tries to preserve any swap files and exit properly.
// (partly from Elvis).
// NOTE: Avoid unsafe functions, such as allocating memory, they can result in
// a deadlock.
static void deadly_signal(int signum)
{
// Set the v:dying variable.
set_vim_var_nr(VV_DYING, 1);
snprintf((char *)IObuff, sizeof(IObuff), "Vim: Caught deadly signal '%s'\n",
signal_name(signum));
// Preserve files and exit.
preserve_exit();
}
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);
break;
#endif
case SIGPIPE:
// Ignore
break;
case SIGTERM:
case SIGQUIT:
case SIGHUP:
if (!rejecting_deadly) {
deadly_signal(signum);
}
break;
default:
fprintf(stderr, "Invalid signal %d", signum);
break;
}
}
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