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/*************************************************************************
* TinyFugue - programmable mud client
* Copyright (C) 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2002, 2003, 2004, 2005, 2006-2007 Ken Keys
*
* TinyFugue (aka "tf") is protected under the terms of the GNU
* General Public License. See the file "COPYING" for details.
************************************************************************/
static const char RCSid[] = "$Id: signals.c,v 35004.70 2007/01/14 19:28:36 kkeys Exp $";
/* Signal handling, core dumps, job control, and interactive shells */
#include "tfconfig.h"
#include <signal.h>
#include <setjmp.h>
#include "port.h"
#if DISABLE_CORE
# include <sys/time.h>
# include <sys/resource.h>
#endif
#include <sys/stat.h> /* for debugger_dump() */
#include "tf.h"
#include "util.h"
#include "pattern.h" /* for tfio.h */
#include "search.h" /* for tfio.h */
#include "tfio.h"
#include "world.h" /* for process.h */
#include "process.h"
#include "tty.h"
#include "output.h"
#include "signals.h"
#include "variable.h"
#include "expand.h" /* current_command */
#ifdef TF_AIX_DECLS
struct rusage *dummy_struct_rusage;
union wait *dummy_union_wait;
#endif
/* POSIX.1 systems should define WIFEXITED and WEXITSTATUS, taking an |int|
* parameter, in <sys/wait.h>. For posix systems, we use them. For non-posix
* systems, we use our own. For systems which falsely claim to be posix,
* but do not define the wait macros, we use our own. We can not detect
* systems which falsely claim to be posix and incorrectly define the wait
* macros as taking a |union wait| parameter. The workaround for such systems
* is to change "#ifdef _POSIX_VERSION" to "#if 0" below.
*/
#include <sys/types.h>
#if HAVE_SYS_WAIT_H
# include <sys/wait.h>
#else
# undef WIFEXITED
# undef WEXITSTATUS
#endif
#ifdef sequent /* the wait macros are known to be broken on Dynix */
# undef WIFEXITED
# undef WEXITSTATUS
#endif
/* These macros can take an |int| or |union wait| parameter, but the posix
* macros are preferred because these require specific knowledge of the
* bit layout, which may not be correct on some systems (although most
* unix-like systems do use this layout).
*/
#ifndef WIFEXITED
# define WIFEXITED(w) (((*(int *)&(w)) & 0xFF) == 0) /* works most places */
#endif
#ifndef WEXITSTATUS
# define WEXITSTATUS(w) (((*(int *)&(w)) >> 8) & 0xFF) /* works most places */
#endif
typedef RETSIGTYPE (SigHandler)(int sig);
#if !HAVE_RAISE
# if HAVE_KILL
# define raise(sig) kill(getpid(), sig)
# endif
#endif
#ifdef SIGABRT
# define ABORT SIGABRT
#else
# ifdef SIGQUIT
# define ABORT SIGQUIT
# else
# define ABORT SIGTERM
# endif
#endif
/* Zero out undefined signals, so we don't have to #ifdef everything later. */
#ifndef SIGHUP
# define SIGHUP 0
#endif
#ifndef SIGTRAP
# define SIGTRAP 0
#endif
#ifndef SIGABRT
# define SIGABRT 0
#endif
#ifndef SIGBUS /* not defined in Linux */
# define SIGBUS 0
#endif
#ifndef SIGPIPE
# define SIGPIPE 0
#endif
#ifndef SIGUSR1
# define SIGUSR1 0
#endif
#ifndef SIGUSR2
# define SIGUSR2 0
#endif
#ifndef SIGTSTP
# define SIGTSTP 0
#endif
#ifndef SIGWINCH
# define SIGWINCH 0
#endif
#ifndef NSIG
/* Find an upper bound of the signals we use */
# define NSIG \
((SIGHUP | SIGINT | SIGQUIT | SIGILL | SIGTRAP | SIGABRT | SIGFPE | \
SIGBUS | SIGSEGV | SIGPIPE | SIGTERM | SIGUSR1 | SIGUSR2 | SIGTSTP | \
SIGWINCH) + 1)
#endif
VEC_TYPEDEF(sig_set, (NSIG-1));
const int feature_core = 1 - DISABLE_CORE;
static const char *argv0 = NULL;
static int have_pending_signals = 0;
static sig_set pending_signals;
static RETSIGTYPE (*parent_tstp_handler)(int sig);
static void handle_interrupt(void);
static void terminate(int sig);
static void coremsg(FILE *dumpfile);
static int debugger_dump(void);
static FILE *get_dumpfile(void);
static RETSIGTYPE core_handler(int sig);
static RETSIGTYPE signal_scheduler(int sig);
static RETSIGTYPE signal_jumper(int sig);
#ifndef SIG_IGN
static RETSIGTYPE SIG_IGN(int sig);
#endif
static SigHandler *old_sighup_handler;
static SigHandler *setsighandler(int sig, SigHandler *func);
static jmp_buf jumpenv;
static int fatal_signal = 0;
/* HAVE_SIGACTION doesn't mean we NEED_sigaction. On some systems that have
* it, struct sigaction will not get defined unless _POSIX_SOURCE or similar
* is defined, so it's best to avoid it if we don't need it.
*/
#ifdef SA_RESTART
# define NEED_sigaction
#endif
#ifdef SA_ACK
# define NEED_sigaction
#endif
static SigHandler *setsighandler(int sig, SigHandler *func)
{
if (!sig) return NULL;
#ifndef NEED_sigaction
return signal(sig, func);
#else
{
struct sigaction act;
SigHandler *oldfunc;
sigaction(sig, NULL, &act);
oldfunc = act.sa_handler;
# ifdef SA_RESTART
/* Disable system call restarting, so select() is interruptable. */
act.sa_flags &= ~SA_RESTART;
# endif
# ifdef SA_ACK
/* Disable OS2 SA_ACK, so signals can be re-installed POSIX-style. */
act.sa_flags &= ~SA_ACK;
# endif
act.sa_handler = func;
sigaction(sig, &act, NULL);
return oldfunc;
}
#endif /* HAVE_SIGACTION */
}
/* Returns s, unless s is NULL, accessing s would cause a SIGBUS or SIGSEGV,
* or s is too long, in which case it returns another valid string describing
* the problem. */
const char *checkstring(const char *s) {
SigHandler *old_sigsegv_handler, *old_sigbus_handler;
const char *p;
if (!s) return "";
fatal_signal = 0;
old_sigsegv_handler = setsighandler(SIGSEGV, signal_jumper);
old_sigbus_handler = setsighandler(SIGBUS, signal_jumper);
if (setjmp(jumpenv)) {
if (fatal_signal == SIGSEGV)
s = "(invalid string: segmentation violation)";
else if (fatal_signal == SIGBUS)
s = "(invalid string: bus error)";
else
s = "(invalid string)";
goto exit;
}
for (p = s; *p; p++) {
if (p - s > 255) {
s = "(invalid string: too long)";
break;
}
}
exit:
setsighandler(SIGBUS, old_sigbus_handler);
setsighandler(SIGSEGV, old_sigsegv_handler);
return s;
}
void init_signals(void)
{
VEC_ZERO(&pending_signals);
have_pending_signals = 0;
old_sighup_handler = setsighandler(SIGHUP , signal_scheduler);
setsighandler(SIGINT , signal_scheduler);
setsighandler(SIGQUIT , core_handler);
setsighandler(SIGILL , core_handler);
setsighandler(SIGTRAP , core_handler);
setsighandler(SIGABRT , core_handler);
setsighandler(SIGFPE , SIG_IGN);
setsighandler(SIGBUS , core_handler);
setsighandler(SIGSEGV , core_handler);
setsighandler(SIGPIPE , SIG_IGN);
setsighandler(SIGTERM , signal_scheduler);
setsighandler(SIGUSR1 , signal_scheduler);
setsighandler(SIGUSR2 , signal_scheduler);
parent_tstp_handler = setsighandler(SIGTSTP , signal_scheduler);
setsighandler(SIGWINCH, signal_scheduler);
#if DISABLE_CORE
{
struct rlimit rlim;
rlim.rlim_cur = rlim.rlim_max = 0;
setrlimit(RLIMIT_CORE, &rlim);
}
#endif
}
#ifndef SIG_IGN
static RETSIGTYPE SIG_IGN(int sig)
{
setsighandler(sig, SIG_IGN); /* restore handler (POSIX) */
}
#endif
static void handle_interrupt(void)
{
int c;
VEC_CLR(SIGINT, &pending_signals);
/* so status line macros in setup_screen() aren't gratuitously killed */
if (!interactive)
die("Interrupt, exiting.", 0);
reset_kbnum();
fix_screen();
puts("C) continue tf; X) exit; T) disable triggers; P) kill processes\r");
fflush(stdout);
c = igetchar();
if (ucase(c) == 'X')
die("Interrupt, exiting.", 0);
if (ucase(c) == 'T') {
set_var_by_id(VAR_borg, 0);
oputs("% Cyborg triggers disabled.");
} else if (ucase(c) == 'P') {
kill_procs();
oputs("% All processes killed.");
}
redraw();
}
int suspend(void)
{
#if SIGTSTP
if (argv0[0] != '-' && /* not a login shell */
parent_tstp_handler == SIG_DFL) /* parent process does job-control */
{
check_mail();
fix_screen();
reset_tty();
raise(SIGSTOP);
cbreak_noecho_mode();
get_window_size();
redraw();
check_mail();
return 1;
}
#endif
oputs("% Job control not available.");
return 0;
}
static RETSIGTYPE core_handler(int sig)
{
FILE *dumpfile;
setsighandler(sig, core_handler); /* restore handler (POSIX) */
if (sig == SIGQUIT) {
if (interactive) {
fix_screen();
#if DISABLE_CORE
puts("SIGQUIT received. Exit? (y/n)\r");
#else
puts("SIGQUIT received. Dump core and exit? (y/n)\r");
#endif
fflush(stdout);
if (igetchar() != 'y') {
redraw();
return;
}
}
fputs("Abnormal termination - SIGQUIT\r\n", stderr);
}
setsighandler(sig, SIG_DFL);
if (sig != SIGQUIT) {
minimal_fix_screen();
dumpfile = get_dumpfile();
coremsg(dumpfile);
fprintf(stderr, "> Abnormal termination - signal %d\r\n\n", sig);
if (dumpfile != stderr)
fprintf(dumpfile, "> Abnormal termination - signal %d\r\n\n", sig);
if (dumpfile != stderr)
fclose(dumpfile);
if (!debugger_dump()) {
#if DISABLE_CORE
fputs("Also, if you can, reinstall tf with --enable-core, "
"attempt to reproduce the\r\n", stderr);
fputs("error, get a stack trace and send it to the author.\r\n",
stderr);
#else /* cores are enabled */
fputs("Also, if you can, include a stack trace in your email.\r\n",
stderr);
# ifdef PLATFORM_UNIX
fputs("To get a stack trace, do this:\r\n", stderr);
fputs("cd src\r\n", stderr);
fputs("script\r\n", stderr);
fputs("gdb -q tf ;# if gdb is unavailable, use 'dbx tf' "
"instead.\r\n", stderr);
fputs("run\r\n", stderr);
fputs("(do whatever is needed to reproduce the core dump)\r\n",
stderr);
fputs("where\r\n", stderr);
fputs("quit\r\n", stderr);
fputs("exit\r\n", stderr);
fputs("\r\n", stderr);
fputs("Then include the \"typescript\" file in your email.\r\n",
stderr);
fputs("\n", stderr);
# endif /* PLATFORM_UNIX */
#endif /* DISABLE_CORE */
}
}
if (interactive) {
close_all();
fputs("\nPress any key.\r\n", stderr);
fflush(stderr);
igetchar();
}
reset_tty();
raise(sig);
}
void crash(int internal, const char *fmt, const char *file, int line, long n)
{
FILE *dumpfile;
setsighandler(SIGQUIT, SIG_DFL);
minimal_fix_screen();
reset_tty();
dumpfile = get_dumpfile();
if (internal) coremsg(dumpfile);
fprintf(dumpfile, "> %s: %s, line %d\r\n",
internal ? "Internal error" : "Aborting", file, line);
fputs("> ", dumpfile);
fprintf(dumpfile, fmt, n);
fputs("\r\n\n", dumpfile);
if (dumpfile != stderr)
fclose(dumpfile);
debugger_dump();
raise(SIGQUIT);
}
static char dumpname[32] = "................................";
static char exebuf[PATH_MAX+1];
static const char *initial_path = NULL;
static char initial_dir[PATH_MAX+1] = "."; /* default: many users never chdir */
static void coremsg(FILE *dumpfile)
{
fputs("Also describe what you were doing in tf when this\r\n", stderr);
fputs("occurred, and whether you can repeat it.\r\n\n", stderr);
fprintf(dumpfile, "> %.512s\r\n", version);
if (*sysname) fprintf(dumpfile, "> %.256s\r\n", sysname);
fprintf(dumpfile, "> %.256s\r\n", featurestr->data);
fprintf(dumpfile,"> virtscreen=%ld, visual=%ld, expnonvis=%ld, "
"emulation=%ld, lp=%ld, sub=%ld\r\n",
virtscreen, visual, expnonvis, emulation, lpflag, sub);
#if SOCKS
fprintf(dumpfile,"> SOCKS %d\r\n", SOCKS);
#endif
fprintf(dumpfile,"> TERM=\"%.32s\"\r\n", TERM ? TERM : "(NULL)");
fprintf(dumpfile,"> cmd=\"%.32s\"\r\n",
current_command ? current_command : "(NULL)");
if (loadfile) {
fprintf(dumpfile,"> line %d-%d of file \"%.32s\"\r\n",
loadstart, loadline,
loadfile->name ? loadfile->name : "(NULL)");
}
}
void init_exename(char *name)
{
argv0 = name;
#if HAVE_GETCWD
getcwd(initial_dir, PATH_MAX);
#elif HAVE_GETWD
getwd(initial_dir);
#endif
initial_path = getenv("PATH");
}
static FILE *get_dumpfile(void)
{
FILE *file;
sprintf(dumpname, "tf.dump.%d.txt", getpid());
file = fopen(dumpname, "w");
if (!file) {
fputs("\r\n\nPlease report the following message to the bug reporting "
"system at http://tinyfugue.sourceforge.net/\r\n"
"or by email to kenkeys@users.sourceforge.net.\r\n", stderr);
return stderr;
} else {
fprintf(stderr, "\r\n\nDumped debugging information to file '%s'.\r\n"
"Please submit this file to the bug reporting system at\r\n"
"http://tinyfugue.sourceforge.net/ or by email to kenkeys@users.sourceforge.net.\r\n",
dumpname);
fputs("# TinyFugue debugging information\n\n", file);
return file;
}
}
#if defined(PLATFORM_UNIX) && HAVE_WAITPID
static const char *test_exename(const char *template, pid_t pid)
{
struct stat statbuf;
sprintf(exebuf, template, pid);
return (stat(exebuf, &statbuf) == 0) ? exebuf : NULL;
}
static const char *get_exename(pid_t pid)
{
const char *exename;
const char *dir;
size_t len;
struct stat statbuf;
/* a /proc entry is most reliable, if one exists */
if ((exename = test_exename("/proc/%d/file", pid)) || /* *BSD */
(exename = test_exename("/proc/%d/exe", pid)) || /* Linux */
(exename = test_exename("/proc/%d/object/a.out", pid))) /* Solaris */
{
return exename;
}
/* else use argv[0]:
if it starts with "/", use it directly;
else if it contains "/", it's relative to initial working dir;
else, search for it in initial $PATH
*/
if (!argv0) {
return NULL;
}
if (argv0[0] == '/') {
return argv0;
}
if (strchr(argv0, '/')) {
sprintf(exebuf, "%s/%s", initial_dir, argv0);
return exebuf;
}
if (!initial_path || !*initial_path)
return NULL;
dir = initial_path;
while (1) {
len = strcspn(dir, ":\0");
if (*dir == '/')
sprintf(exebuf, "%.*s/%s", len, dir, argv0);
else
sprintf(exebuf, "%s/%.*s/%s", initial_dir, len, dir, argv0);
if (stat(exebuf, &statbuf) == 0)
return exebuf;
if (!dir[len])
break;
dir += len + 1;
}
return NULL;
}
/* Inspired by Jeff Brown */
static int debugger_dump(void)
{
pid_t tf_pid = getpid();
const char *exename;
if ((exename = get_exename(tf_pid))) {
pid_t child_pid;
child_pid = fork();
if (child_pid < 0) {
/* error */
fprintf(stderr, "fork: %s\r\n", strerror(errno));
} else if (child_pid > 0) {
/* parent */
pid_t wait_pid = 0;
int status = 0;
wait_pid = waitpid(child_pid, &status, 0);
if (shell_status(status) == 0) {
return 1;
} else {
unlink(dumpname);
}
} else {
/* child */
char inname[1024];
char cmd[2048];
int retval;
sprintf(inname, "%.1000s/tf.gdb", TFLIBDIR);
sprintf(cmd, "chmod go-rwx %s; gdb -n -batch -x %s '%s' %d "
">>%s 2>&1", dumpname, inname, exename, tf_pid, dumpname);
retval = system(cmd);
exit(shell_status(retval) == 0 ? 0 : 1);
}
}
return 0;
}
#else /* !PLATFORM_UNIX */
static int debugger_dump(void) { return 0; }
#endif /* PLATFORM_UNIX */
static void terminate(int sig)
{
setsighandler(sig, SIG_DFL);
fix_screen();
reset_tty();
fprintf(stderr, "Terminating - signal %d\r\n", sig);
raise(sig);
}
static RETSIGTYPE signal_scheduler(int sig)
{
setsighandler(sig, signal_scheduler); /* restore handler (POSIX) */
VEC_SET(sig, &pending_signals); /* set flag to deal with it later */
have_pending_signals++;
}
static RETSIGTYPE signal_jumper(int sig)
{
fatal_signal = sig;
longjmp(jumpenv, 1);
/* don't need to restore handler */
}
void process_signals(void)
{
if (!have_pending_signals) return;
if (VEC_ISSET(SIGINT, &pending_signals)) handle_interrupt();
if (VEC_ISSET(SIGTSTP, &pending_signals)) suspend();
if (VEC_ISSET(SIGWINCH, &pending_signals))
if (!get_window_size()) operror("TIOCGWINSZ ioctl");
if (VEC_ISSET(SIGHUP, &pending_signals)) do_hook(H_SIGHUP, NULL, "");
if (VEC_ISSET(SIGTERM, &pending_signals)) do_hook(H_SIGTERM, NULL, "");
if (VEC_ISSET(SIGUSR1, &pending_signals)) do_hook(H_SIGUSR1, NULL, "");
if (VEC_ISSET(SIGUSR2, &pending_signals)) do_hook(H_SIGUSR2, NULL, "");
if (VEC_ISSET(SIGHUP, &pending_signals) && old_sighup_handler == SIG_DFL)
terminate(SIGHUP);
if (VEC_ISSET(SIGTERM, &pending_signals))
terminate(SIGTERM);
have_pending_signals = 0;
VEC_ZERO(&pending_signals);
}
int interrupted(void)
{
return VEC_ISSET(SIGINT, &pending_signals);
}
int shell_status(int result)
{
/* If the next line causes errors like "request for member `w_S' in
* something not a structure or union", then <sys/wait.h> must have
* defined WIFEXITED and WEXITSTATUS incorrectly (violating Posix.1).
* The workaround is to not #include <sys/wait.h> at the top of this
* file, so we can use our own definitions.
*/
return (WIFEXITED(result)) ? WEXITSTATUS(result) : -1;
}
int shell(const char *cmd)
{
int result;
check_mail();
fix_screen();
reset_tty();
setsighandler(SIGTSTP, parent_tstp_handler);
result = system(cmd);
setsighandler(SIGTSTP, signal_scheduler);
cbreak_noecho_mode();
if (result == -1) {
eprintf("%s", strerror(errno));
} else if (shpause && interactive) {
puts("\r\n% Press any key to continue tf.\r");
igetchar();
}
get_window_size();
redraw();
if (result == -1) return result;
check_mail();
#ifdef PLATFORM_OS2
return result;
#else /* UNIX */
return shell_status(result);
#endif
}
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