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os_unix.c
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os_unix.c
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/* vi:set ts=8 sts=4 sw=4 noet:
*
* VIM - Vi IMproved by Bram Moolenaar
* OS/2 port by Paul Slootman
* VMS merge by Zoltan Arpadffy
*
* Do ":help uganda" in Vim to read copying and usage conditions.
* Do ":help credits" in Vim to see a list of people who contributed.
* See README.txt for an overview of the Vim source code.
*/
/*
* os_unix.c -- code for all flavors of Unix (BSD, SYSV, SVR4, POSIX, ...)
* Also for OS/2, using the excellent EMX package!!!
* Also for Atari MiNT.
*
* A lot of this file was originally written by Juergen Weigert and later
* changed beyond recognition.
*/
#include "vim.h"
#ifdef FEAT_MZSCHEME
# include "if_mzsch.h"
#endif
#include "os_unixx.h" // unix includes for os_unix.c only
#ifdef USE_XSMP
# include <X11/SM/SMlib.h>
#endif
#ifdef HAVE_SELINUX
# include <selinux/selinux.h>
static int selinux_enabled = -1;
#endif
#ifdef HAVE_SMACK
# include <attr/xattr.h>
# include <linux/xattr.h>
# ifndef SMACK_LABEL_LEN
# define SMACK_LABEL_LEN 1024
# endif
#endif
#ifdef __CYGWIN__
# ifndef MSWIN
# include <cygwin/version.h>
# include <sys/cygwin.h> // for cygwin_conv_to_posix_path() and/or
// for cygwin_conv_path()
# ifdef FEAT_CYGWIN_WIN32_CLIPBOARD
# define WIN32_LEAN_AND_MEAN
# include <windows.h>
# include "winclip.pro"
# endif
# endif
#endif
#ifdef FEAT_MOUSE_GPM
# include <gpm.h>
// <linux/keyboard.h> contains defines conflicting with "keymap.h",
// I just copied relevant defines here. A cleaner solution would be to put gpm
// code into separate file and include there linux/keyboard.h
// #include <linux/keyboard.h>
# define KG_SHIFT 0
# define KG_CTRL 2
# define KG_ALT 3
# define KG_ALTGR 1
# define KG_SHIFTL 4
# define KG_SHIFTR 5
# define KG_CTRLL 6
# define KG_CTRLR 7
# define KG_CAPSSHIFT 8
static void gpm_close(void);
static int gpm_open(void);
static int mch_gpm_process(void);
#endif
#ifdef FEAT_SYSMOUSE
# include <sys/consio.h>
# include <sys/fbio.h>
static int sysmouse_open(void);
static void sysmouse_close(void);
static RETSIGTYPE sig_sysmouse SIGPROTOARG;
#endif
/*
* end of autoconf section. To be extended...
*/
// Are the following #ifdefs still required? And why? Is that for X11?
#if defined(ESIX) || defined(M_UNIX) && !defined(SCO)
# ifdef SIGWINCH
# undef SIGWINCH
# endif
# ifdef TIOCGWINSZ
# undef TIOCGWINSZ
# endif
#endif
#if defined(SIGWINDOW) && !defined(SIGWINCH) // hpux 9.01 has it
# define SIGWINCH SIGWINDOW
#endif
#ifdef FEAT_X11
# include <X11/Xlib.h>
# include <X11/Xutil.h>
# include <X11/Xatom.h>
# ifdef FEAT_XCLIPBOARD
# include <X11/Intrinsic.h>
# include <X11/Shell.h>
# include <X11/StringDefs.h>
static Widget xterm_Shell = (Widget)0;
static void clip_update(void);
static void xterm_update(void);
# endif
# if defined(FEAT_XCLIPBOARD) || defined(FEAT_TITLE)
Window x11_window = 0;
# endif
Display *x11_display = NULL;
#endif
static int ignore_sigtstp = FALSE;
#ifdef FEAT_TITLE
static int get_x11_title(int);
static char_u *oldtitle = NULL;
static volatile sig_atomic_t oldtitle_outdated = FALSE;
static int unix_did_set_title = FALSE;
static char_u *oldicon = NULL;
static int did_set_icon = FALSE;
#endif
static void may_core_dump(void);
#ifdef HAVE_UNION_WAIT
typedef union wait waitstatus;
#else
typedef int waitstatus;
#endif
static int WaitForChar(long msec, int *interrupted, int ignore_input);
static int WaitForCharOrMouse(long msec, int *interrupted, int ignore_input);
#ifdef VMS
int RealWaitForChar(int, long, int *, int *interrupted);
#else
static int RealWaitForChar(int, long, int *, int *interrupted);
#endif
#ifdef FEAT_XCLIPBOARD
static int do_xterm_trace(void);
# define XT_TRACE_DELAY 50 // delay for xterm tracing
#endif
static void handle_resize(void);
#if defined(SIGWINCH)
static RETSIGTYPE sig_winch SIGPROTOARG;
#endif
#if defined(SIGINT)
static RETSIGTYPE catch_sigint SIGPROTOARG;
#endif
#if defined(SIGUSR1)
static RETSIGTYPE catch_sigusr1 SIGPROTOARG;
#endif
#if defined(SIGPWR)
static RETSIGTYPE catch_sigpwr SIGPROTOARG;
#endif
#if defined(SIGALRM) && defined(FEAT_X11) \
&& defined(FEAT_TITLE) && !defined(FEAT_GUI_GTK)
# define SET_SIG_ALARM
static RETSIGTYPE sig_alarm SIGPROTOARG;
// volatile because it is used in signal handler sig_alarm().
static volatile sig_atomic_t sig_alarm_called;
#endif
static RETSIGTYPE deathtrap SIGPROTOARG;
static void catch_int_signal(void);
static void set_signals(void);
static void catch_signals(RETSIGTYPE (*func_deadly)(), RETSIGTYPE (*func_other)());
#ifdef HAVE_SIGPROCMASK
# define SIGSET_DECL(set) sigset_t set;
# define BLOCK_SIGNALS(set) block_signals(set)
# define UNBLOCK_SIGNALS(set) unblock_signals(set)
#else
# define SIGSET_DECL(set)
# define BLOCK_SIGNALS(set) do { /**/ } while (0)
# define UNBLOCK_SIGNALS(set) do { /**/ } while (0)
#endif
static int have_wildcard(int, char_u **);
static int have_dollars(int, char_u **);
static int save_patterns(int num_pat, char_u **pat, int *num_file, char_u ***file);
#ifndef SIG_ERR
# define SIG_ERR ((RETSIGTYPE (*)())-1)
#endif
// volatile because it is used in signal handler sig_winch().
static volatile sig_atomic_t do_resize = FALSE;
static char_u *extra_shell_arg = NULL;
static int show_shell_mess = TRUE;
// volatile because it is used in signal handler deathtrap().
static volatile sig_atomic_t deadly_signal = 0; // The signal we caught
// volatile because it is used in signal handler deathtrap().
static volatile sig_atomic_t in_mch_delay = FALSE; // sleeping in mch_delay()
#if defined(FEAT_JOB_CHANNEL) && !defined(USE_SYSTEM)
static int dont_check_job_ended = 0;
#endif
// Current terminal mode from mch_settmode(). Can differ from cur_tmode.
static tmode_T mch_cur_tmode = TMODE_COOK;
#ifdef USE_XSMP
typedef struct
{
SmcConn smcconn; // The SM connection ID
IceConn iceconn; // The ICE connection ID
char *clientid; // The client ID for the current smc session
Bool save_yourself; // If we're in the middle of a save_yourself
Bool shutdown; // If we're in shutdown mode
} xsmp_config_T;
static xsmp_config_T xsmp;
#endif
#ifdef SYS_SIGLIST_DECLARED
/*
* I have seen
* extern char *_sys_siglist[NSIG];
* on Irix, Linux, NetBSD and Solaris. It contains a nice list of strings
* that describe the signals. That is nearly what we want here. But
* autoconf does only check for sys_siglist (without the underscore), I
* do not want to change everything today.... jw.
* This is why AC_DECL_SYS_SIGLIST is commented out in configure.ac.
*/
#endif
static struct signalinfo
{
int sig; // Signal number, eg. SIGSEGV etc
char *name; // Signal name (not char_u!).
char deadly; // Catch as a deadly signal?
} signal_info[] =
{
#ifdef SIGHUP
{SIGHUP, "HUP", TRUE},
#endif
#ifdef SIGQUIT
{SIGQUIT, "QUIT", TRUE},
#endif
#ifdef SIGILL
{SIGILL, "ILL", TRUE},
#endif
#ifdef SIGTRAP
{SIGTRAP, "TRAP", TRUE},
#endif
#ifdef SIGABRT
{SIGABRT, "ABRT", TRUE},
#endif
#ifdef SIGEMT
{SIGEMT, "EMT", TRUE},
#endif
#ifdef SIGFPE
{SIGFPE, "FPE", TRUE},
#endif
#ifdef SIGBUS
{SIGBUS, "BUS", TRUE},
#endif
#if defined(SIGSEGV) && !defined(FEAT_MZSCHEME)
// MzScheme uses SEGV in its garbage collector
{SIGSEGV, "SEGV", TRUE},
#endif
#ifdef SIGSYS
{SIGSYS, "SYS", TRUE},
#endif
#ifdef SIGALRM
{SIGALRM, "ALRM", FALSE}, // Perl's alarm() can trigger it
#endif
#ifdef SIGTERM
{SIGTERM, "TERM", TRUE},
#endif
#if defined(SIGVTALRM) && !defined(FEAT_RUBY)
{SIGVTALRM, "VTALRM", TRUE},
#endif
#if defined(SIGPROF) && !defined(FEAT_MZSCHEME) && !defined(WE_ARE_PROFILING)
// MzScheme uses SIGPROF for its own needs; On Linux with profiling
// this makes Vim exit. WE_ARE_PROFILING is defined in Makefile.
{SIGPROF, "PROF", TRUE},
#endif
#ifdef SIGXCPU
{SIGXCPU, "XCPU", TRUE},
#endif
#ifdef SIGXFSZ
{SIGXFSZ, "XFSZ", TRUE},
#endif
#ifdef SIGUSR1
{SIGUSR1, "USR1", FALSE},
#endif
#if defined(SIGUSR2) && !defined(FEAT_SYSMOUSE)
// Used for sysmouse handling
{SIGUSR2, "USR2", TRUE},
#endif
#ifdef SIGINT
{SIGINT, "INT", FALSE},
#endif
#ifdef SIGWINCH
{SIGWINCH, "WINCH", FALSE},
#endif
#ifdef SIGTSTP
{SIGTSTP, "TSTP", FALSE},
#endif
#ifdef SIGPIPE
{SIGPIPE, "PIPE", FALSE},
#endif
{-1, "Unknown!", FALSE}
};
int
mch_chdir(char *path)
{
if (p_verbose >= 5)
{
verbose_enter();
smsg("chdir(%s)", path);
verbose_leave();
}
# ifdef VMS
return chdir(vms_fixfilename(path));
# else
return chdir(path);
# endif
}
// Why is NeXT excluded here (and not in os_unixx.h)?
#if defined(ECHOE) && defined(ICANON) \
&& (defined(HAVE_TERMIO_H) || defined(HAVE_TERMIOS_H)) \
&& !defined(__NeXT__)
# define NEW_TTY_SYSTEM
#endif
/*
* Write s[len] to the screen (stdout).
*/
void
mch_write(char_u *s, int len)
{
vim_ignored = (int)write(1, (char *)s, len);
if (p_wd) // Unix is too fast, slow down a bit more
RealWaitForChar(read_cmd_fd, p_wd, NULL, NULL);
}
/*
* Function passed to inchar_loop() to handle window resizing.
* If "check_only" is TRUE: Return whether there was a resize.
* If "check_only" is FALSE: Deal with the window resized.
*/
static int
resize_func(int check_only)
{
if (check_only)
return do_resize;
while (do_resize)
handle_resize();
return FALSE;
}
/*
* mch_inchar(): low level input function.
* Get a characters from the keyboard.
* Return the number of characters that are available.
* If wtime == 0 do not wait for characters.
* If wtime == n wait a short time for characters.
* If wtime == -1 wait forever for characters.
*/
int
mch_inchar(
char_u *buf,
int maxlen,
long wtime, // don't use "time", MIPS cannot handle it
int tb_change_cnt)
{
return inchar_loop(buf, maxlen, wtime, tb_change_cnt,
WaitForChar, resize_func);
}
static void
handle_resize(void)
{
do_resize = FALSE;
shell_resized();
}
/*
* Return non-zero if a character is available.
*/
int
mch_char_avail(void)
{
return WaitForChar(0L, NULL, FALSE);
}
#if defined(FEAT_TERMINAL) || defined(PROTO)
/*
* Check for any pending input or messages.
*/
int
mch_check_messages(void)
{
return WaitForChar(0L, NULL, TRUE);
}
#endif
#if defined(HAVE_TOTAL_MEM) || defined(PROTO)
# ifdef HAVE_SYS_RESOURCE_H
# include <sys/resource.h>
# endif
# if defined(HAVE_SYS_SYSCTL_H) && defined(HAVE_SYSCTL)
# include <sys/sysctl.h>
# endif
# if defined(HAVE_SYS_SYSINFO_H) && defined(HAVE_SYSINFO)
# include <sys/sysinfo.h>
# endif
# ifdef MACOS_X
# include <mach/mach_host.h>
# include <mach/mach_port.h>
# endif
/*
* Return total amount of memory available in Kbyte.
* Doesn't change when memory has been allocated.
*/
long_u
mch_total_mem(int special UNUSED)
{
long_u mem = 0;
long_u shiftright = 10; // how much to shift "mem" right for Kbyte
# ifdef MACOS_X
{
// Mac (Darwin) way of getting the amount of RAM available
mach_port_t host = mach_host_self();
kern_return_t kret;
# ifdef HOST_VM_INFO64
struct vm_statistics64 vm_stat;
natural_t count = HOST_VM_INFO64_COUNT;
kret = host_statistics64(host, HOST_VM_INFO64,
(host_info64_t)&vm_stat, &count);
# else
struct vm_statistics vm_stat;
natural_t count = HOST_VM_INFO_COUNT;
kret = host_statistics(host, HOST_VM_INFO,
(host_info_t)&vm_stat, &count);
# endif
if (kret == KERN_SUCCESS)
// get the amount of user memory by summing each usage
mem = (long_u)(vm_stat.free_count + vm_stat.active_count
+ vm_stat.inactive_count
# ifdef MAC_OS_X_VERSION_10_9
+ vm_stat.compressor_page_count
# endif
) * sysconf(_SC_PAGESIZE);
mach_port_deallocate(mach_task_self(), host);
}
# endif
# ifdef HAVE_SYSCTL
if (mem == 0)
{
// BSD way of getting the amount of RAM available.
int mib[2];
size_t len = sizeof(long_u);
# ifdef HW_USERMEM64
long_u physmem;
# else
// sysctl() may return 32 bit or 64 bit, accept both
union {
int_u u32;
long_u u64;
} physmem;
# endif
mib[0] = CTL_HW;
# ifdef HW_USERMEM64
mib[1] = HW_USERMEM64;
# else
mib[1] = HW_USERMEM;
# endif
if (sysctl(mib, 2, &physmem, &len, NULL, 0) == 0)
{
# ifdef HW_USERMEM64
mem = (long_u)physmem;
# else
if (len == sizeof(physmem.u64))
mem = (long_u)physmem.u64;
else
mem = (long_u)physmem.u32;
# endif
}
}
# endif
# if defined(HAVE_SYS_SYSINFO_H) && defined(HAVE_SYSINFO)
if (mem == 0)
{
struct sysinfo sinfo;
// Linux way of getting amount of RAM available
if (sysinfo(&sinfo) == 0)
{
# ifdef HAVE_SYSINFO_MEM_UNIT
// avoid overflow as much as possible
while (shiftright > 0 && (sinfo.mem_unit & 1) == 0)
{
sinfo.mem_unit = sinfo.mem_unit >> 1;
--shiftright;
}
mem = sinfo.totalram * sinfo.mem_unit;
# else
mem = sinfo.totalram;
# endif
}
}
# endif
# ifdef HAVE_SYSCONF
if (mem == 0)
{
long pagesize, pagecount;
// Solaris way of getting amount of RAM available
pagesize = sysconf(_SC_PAGESIZE);
pagecount = sysconf(_SC_PHYS_PAGES);
if (pagesize > 0 && pagecount > 0)
{
// avoid overflow as much as possible
while (shiftright > 0 && (pagesize & 1) == 0)
{
pagesize = (long_u)pagesize >> 1;
--shiftright;
}
mem = (long_u)pagesize * pagecount;
}
}
# endif
// Return the minimum of the physical memory and the user limit, because
// using more than the user limit may cause Vim to be terminated.
# if defined(HAVE_SYS_RESOURCE_H) && defined(HAVE_GETRLIMIT)
{
struct rlimit rlp;
if (getrlimit(RLIMIT_DATA, &rlp) == 0
&& rlp.rlim_cur < ((rlim_t)1 << (sizeof(long_u) * 8 - 1))
# ifdef RLIM_INFINITY
&& rlp.rlim_cur != RLIM_INFINITY
# endif
&& ((long_u)rlp.rlim_cur >> 10) < (mem >> shiftright)
)
{
mem = (long_u)rlp.rlim_cur;
shiftright = 10;
}
}
# endif
if (mem > 0)
return mem >> shiftright;
return (long_u)0x1fffff;
}
#endif
/*
* "flags": MCH_DELAY_IGNOREINPUT - don't read input
* MCH_DELAY_SETTMODE - use settmode() even for short delays
*/
void
mch_delay(long msec, int flags)
{
tmode_T old_tmode;
int call_settmode;
#ifdef FEAT_MZSCHEME
long total = msec; // remember original value
#endif
if (flags & MCH_DELAY_IGNOREINPUT)
{
// Go to cooked mode without echo, to allow SIGINT interrupting us
// here. But we don't want QUIT to kill us (CTRL-\ used in a
// shell may produce SIGQUIT).
// Only do this if sleeping for more than half a second.
in_mch_delay = TRUE;
call_settmode = mch_cur_tmode == TMODE_RAW
&& (msec > 500 || (flags & MCH_DELAY_SETTMODE));
if (call_settmode)
{
old_tmode = mch_cur_tmode;
settmode(TMODE_SLEEP);
}
/*
* Everybody sleeps in a different way...
* Prefer nanosleep(), some versions of usleep() can only sleep up to
* one second.
*/
#ifdef FEAT_MZSCHEME
do
{
// if total is large enough, wait by portions in p_mzq
if (total > p_mzq)
msec = p_mzq;
else
msec = total;
total -= msec;
#endif
#ifdef HAVE_NANOSLEEP
{
struct timespec ts;
ts.tv_sec = msec / 1000;
ts.tv_nsec = (msec % 1000) * 1000000;
(void)nanosleep(&ts, NULL);
}
#else
# ifdef HAVE_USLEEP
while (msec >= 1000)
{
usleep((unsigned int)(999 * 1000));
msec -= 999;
}
usleep((unsigned int)(msec * 1000));
# else
# ifndef HAVE_SELECT
poll(NULL, 0, (int)msec);
# else
{
struct timeval tv;
tv.tv_sec = msec / 1000;
tv.tv_usec = (msec % 1000) * 1000;
// NOTE: Solaris 2.6 has a bug that makes select() hang here. Get
// a patch from Sun to fix this. Reported by Gunnar Pedersen.
select(0, NULL, NULL, NULL, &tv);
}
# endif // HAVE_SELECT
# endif // HAVE_NANOSLEEP
#endif // HAVE_USLEEP
#ifdef FEAT_MZSCHEME
}
while (total > 0);
#endif
if (call_settmode)
settmode(old_tmode);
in_mch_delay = FALSE;
}
else
WaitForChar(msec, NULL, FALSE);
}
#if defined(HAVE_STACK_LIMIT) \
|| (!defined(HAVE_SIGALTSTACK) && defined(HAVE_SIGSTACK))
# define HAVE_CHECK_STACK_GROWTH
/*
* Support for checking for an almost-out-of-stack-space situation.
*/
/*
* Return a pointer to an item on the stack. Used to find out if the stack
* grows up or down.
*/
static int stack_grows_downwards;
/*
* Find out if the stack grows upwards or downwards.
* "p" points to a variable on the stack of the caller.
*/
static void
check_stack_growth(char *p)
{
int i;
stack_grows_downwards = (p > (char *)&i);
}
#endif
#if defined(HAVE_STACK_LIMIT) || defined(PROTO)
static char *stack_limit = NULL;
#if defined(_THREAD_SAFE) && defined(HAVE_PTHREAD_NP_H)
# include <pthread.h>
# include <pthread_np.h>
#endif
/*
* Find out until how var the stack can grow without getting into trouble.
* Called when starting up and when switching to the signal stack in
* deathtrap().
*/
static void
get_stack_limit(void)
{
struct rlimit rlp;
int i;
long lim;
// Set the stack limit to 15/16 of the allowable size. Skip this when the
// limit doesn't fit in a long (rlim_cur might be "long long").
if (getrlimit(RLIMIT_STACK, &rlp) == 0
&& rlp.rlim_cur < ((rlim_t)1 << (sizeof(long_u) * 8 - 1))
# ifdef RLIM_INFINITY
&& rlp.rlim_cur != RLIM_INFINITY
# endif
)
{
lim = (long)rlp.rlim_cur;
#if defined(_THREAD_SAFE) && defined(HAVE_PTHREAD_NP_H)
{
pthread_attr_t attr;
size_t size;
// On FreeBSD the initial thread always has a fixed stack size, no
// matter what the limits are set to. Normally it's 1 Mbyte.
pthread_attr_init(&attr);
if (pthread_attr_get_np(pthread_self(), &attr) == 0)
{
pthread_attr_getstacksize(&attr, &size);
if (lim > (long)size)
lim = (long)size;
}
pthread_attr_destroy(&attr);
}
#endif
if (stack_grows_downwards)
{
stack_limit = (char *)((long)&i - (lim / 16L * 15L));
if (stack_limit >= (char *)&i)
// overflow, set to 1/16 of current stack position
stack_limit = (char *)((long)&i / 16L);
}
else
{
stack_limit = (char *)((long)&i + (lim / 16L * 15L));
if (stack_limit <= (char *)&i)
stack_limit = NULL; // overflow
}
}
}
/*
* Return FAIL when running out of stack space.
* "p" must point to any variable local to the caller that's on the stack.
*/
int
mch_stackcheck(char *p)
{
if (stack_limit != NULL)
{
if (stack_grows_downwards)
{
if (p < stack_limit)
return FAIL;
}
else if (p > stack_limit)
return FAIL;
}
return OK;
}
#endif
#if defined(HAVE_SIGALTSTACK) || defined(HAVE_SIGSTACK)
/*
* Support for using the signal stack.
* This helps when we run out of stack space, which causes a SIGSEGV. The
* signal handler then must run on another stack, since the normal stack is
* completely full.
*/
# ifdef HAVE_SIGALTSTACK
static stack_t sigstk; // for sigaltstack()
# else
static struct sigstack sigstk; // for sigstack()
# endif
/*
* Get a size of signal stack.
* Preference (if available): sysconf > SIGSTKSZ > guessed size
*/
static long int get_signal_stack_size()
{
# ifdef HAVE_SYSCONF_SIGSTKSZ
long int size = -1;
// return size only if sysconf doesn't return an error
if ((size = sysconf(_SC_SIGSTKSZ)) > -1)
return size;
# endif
# ifdef SIGSTKSZ
// if sysconf() isn't available or gives error, return SIGSTKSZ
// if defined
return SIGSTKSZ;
# endif
// otherwise guess the size
return 8000;
}
static char *signal_stack;
static void
init_signal_stack(void)
{
if (signal_stack != NULL)
{
# ifdef HAVE_SIGALTSTACK
# ifdef HAVE_SS_BASE
sigstk.ss_base = signal_stack;
# else
sigstk.ss_sp = signal_stack;
# endif
sigstk.ss_size = get_signal_stack_size();
sigstk.ss_flags = 0;
(void)sigaltstack(&sigstk, NULL);
# else
sigstk.ss_sp = signal_stack;
if (stack_grows_downwards)
sigstk.ss_sp += get_signal_stack_size() - 1;
sigstk.ss_onstack = 0;
(void)sigstack(&sigstk, NULL);
# endif
}
}
#endif
/*
* We need correct prototypes for a signal function, otherwise mean compilers
* will barf when the second argument to signal() is ``wrong''.
* Let me try it with a few tricky defines from my own osdef.h (jw).
*/
#if defined(SIGWINCH)
static RETSIGTYPE
sig_winch SIGDEFARG(sigarg)
{
// this is not required on all systems, but it doesn't hurt anybody
signal(SIGWINCH, (RETSIGTYPE (*)())sig_winch);
do_resize = TRUE;
SIGRETURN;
}
#endif
#if defined(SIGINT)
static RETSIGTYPE
catch_sigint SIGDEFARG(sigarg)
{
// this is not required on all systems, but it doesn't hurt anybody
signal(SIGINT, (RETSIGTYPE (*)())catch_sigint);
got_int = TRUE;
SIGRETURN;
}
#endif
#if defined(SIGUSR1)
static RETSIGTYPE
catch_sigusr1 SIGDEFARG(sigarg)
{
// this is not required on all systems, but it doesn't hurt anybody
signal(SIGUSR1, (RETSIGTYPE (*)())catch_sigusr1);
got_sigusr1 = TRUE;
SIGRETURN;
}
#endif
#if defined(SIGPWR)
static RETSIGTYPE
catch_sigpwr SIGDEFARG(sigarg)
{
// this is not required on all systems, but it doesn't hurt anybody
signal(SIGPWR, (RETSIGTYPE (*)())catch_sigpwr);
/*
* I'm not sure we get the SIGPWR signal when the system is really going
* down or when the batteries are almost empty. Just preserve the swap
* files and don't exit, that can't do any harm.
*/
ml_sync_all(FALSE, FALSE);
SIGRETURN;
}
#endif
#ifdef SET_SIG_ALARM
/*
* signal function for alarm().
*/
static RETSIGTYPE
sig_alarm SIGDEFARG(sigarg)
{
// doesn't do anything, just to break a system call
sig_alarm_called = TRUE;
SIGRETURN;
}
#endif
#if (defined(HAVE_SETJMP_H) \
&& ((defined(FEAT_X11) && defined(FEAT_XCLIPBOARD)) \
|| defined(FEAT_LIBCALL))) \
|| defined(PROTO)
# define USING_SETJMP 1
// argument to SETJMP()
static JMP_BUF lc_jump_env;
# ifdef SIGHASARG
// Caught signal number, 0 when no signal was caught; used for mch_libcall().
// Volatile because it is used in signal handlers.
static volatile sig_atomic_t lc_signal;
# endif
// TRUE when lc_jump_env is valid.
// Volatile because it is used in signal handler deathtrap().
static volatile sig_atomic_t lc_active INIT(= FALSE);
/*
* A simplistic version of setjmp() that only allows one level of using.
* Used to protect areas where we could crash.
* Don't call twice before calling mch_endjmp()!.
*
* Usage:
* mch_startjmp();
* if (SETJMP(lc_jump_env) != 0)
* {
* mch_didjmp();
* emsg("crash!");
* }
* else
* {
* do_the_work;
* mch_endjmp();
* }
* Note: Can't move SETJMP() here, because a function calling setjmp() must
* not return before the saved environment is used.
* Returns OK for normal return, FAIL when the protected code caused a
* problem and LONGJMP() was used.
*/
static void
mch_startjmp(void)
{
# ifdef SIGHASARG
lc_signal = 0;
# endif
lc_active = TRUE;
}
static void
mch_endjmp(void)
{
lc_active = FALSE;
}
static void
mch_didjmp(void)
{
# if defined(HAVE_SIGALTSTACK) || defined(HAVE_SIGSTACK)
// On FreeBSD the signal stack has to be reset after using siglongjmp(),
// otherwise catching the signal only works once.
init_signal_stack();
# endif
}
#endif
/*
* 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 RETSIGTYPE
deathtrap SIGDEFARG(sigarg)
{
static int entered = 0; // count the number of times we got here.
// Note: when memory has been corrupted
// this may get an arbitrary value!
#ifdef SIGHASARG
int i;
#endif
#if defined(USING_SETJMP)
/*
* Catch a crash in protected code.
* Restores the environment saved in lc_jump_env, which looks like
* SETJMP() returns 1.
*/
if (lc_active)