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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 BeOS and Atari MiNT.
*
* A lot of this file was originally written by Juergen Weigert and later
* changed beyond recognition.
*/
/*
* Some systems have a prototype for select() that has (int *) instead of
* (fd_set *), which is wrong. This define removes that prototype. We define
* our own prototype below.
* Don't use it for the Mac, it causes a warning for precompiled headers.
* TODO: use a configure check for precompiled headers?
*/
#if !defined(__APPLE__) && !defined(__TANDEM)
# define select select_declared_wrong
#endif
#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
/*
* Use this prototype for select, some include files have a wrong prototype
*/
#ifndef __TANDEM
# undef select
# ifdef __BEOS__
# define select beos_select
# endif
#endif
#ifdef __CYGWIN__
# ifndef WIN32
# 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
#if defined(HAVE_SELECT)
extern int select(int, fd_set *, fd_set *, fd_set *, struct timeval *);
#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;
# ifdef FEAT_TITLE
static int get_x11_windis(void);
static void set_x11_title(char_u *);
static void set_x11_icon(char_u *);
# endif
#endif
#ifdef FEAT_TITLE
static int get_x11_title(int);
static int get_x11_icon(int);
static char_u *oldtitle = NULL;
static int 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 pid_t wait4pid(pid_t, waitstatus *);
static int WaitForChar(long msec, int *interrupted, int ignore_input);
static int WaitForCharOrMouse(long msec, int *interrupted, int ignore_input);
#if defined(__BEOS__) || defined(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(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 int 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 int 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 int deadly_signal = 0; /* The signal we caught */
/* volatile because it is used in signal handler deathtrap(). */
static volatile int in_mch_delay = FALSE; /* sleeping in mch_delay() */
#if defined(FEAT_JOB_CHANNEL) && !defined(USE_SYSTEM)
static int dont_check_job_ended = 0;
#endif
static int curr_tmode = TMODE_COOK; /* contains current terminal mode */
#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", TRUE},
#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((char_u *)"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)
{
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);
}
/*
* 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)
{
int len;
int interrupted = FALSE;
int did_start_blocking = FALSE;
long wait_time;
long elapsed_time = 0;
#ifdef ELAPSED_FUNC
ELAPSED_TYPE start_tv;
ELAPSED_INIT(start_tv);
#endif
/* repeat until we got a character or waited long enough */
for (;;)
{
/* Check if window changed size while we were busy, perhaps the ":set
* columns=99" command was used. */
while (do_resize)
handle_resize();
#ifdef MESSAGE_QUEUE
parse_queued_messages();
/* If input was put directly in typeahead buffer bail out here. */
if (typebuf_changed(tb_change_cnt))
return 0;
#endif
if (wtime < 0 && did_start_blocking)
/* blocking and already waited for p_ut */
wait_time = -1;
else
{
if (wtime >= 0)
wait_time = wtime;
else
/* going to block after p_ut */
wait_time = p_ut;
#ifdef ELAPSED_FUNC
elapsed_time = ELAPSED_FUNC(start_tv);
#endif
wait_time -= elapsed_time;
if (wait_time < 0)
{
if (wtime >= 0)
/* no character available within "wtime" */
return 0;
if (wtime < 0)
{
/* no character available within 'updatetime' */
did_start_blocking = TRUE;
if (trigger_cursorhold() && maxlen >= 3
&& !typebuf_changed(tb_change_cnt))
{
buf[0] = K_SPECIAL;
buf[1] = KS_EXTRA;
buf[2] = (int)KE_CURSORHOLD;
return 3;
}
/*
* If there is no character available within 'updatetime'
* seconds flush all the swap files to disk.
* Also done when interrupted by SIGWINCH.
*/
before_blocking();
continue;
}
}
}
#ifdef FEAT_JOB_CHANNEL
/* Checking if a job ended requires polling. Do this every 100 msec. */
if (has_pending_job() && (wait_time < 0 || wait_time > 100L))
wait_time = 100L;
/* If there is readahead then parse_queued_messages() timed out and we
* should call it again soon. */
if ((wait_time < 0 || wait_time > 100L) && channel_any_readahead())
wait_time = 10L;
#endif
#ifdef FEAT_BEVAL_GUI
if (p_beval && wait_time > 100L)
/* The 'balloonexpr' may indirectly invoke a callback while waiting
* for a character, need to check often. */
wait_time = 100L;
#endif
/*
* We want to be interrupted by the winch signal
* or by an event on the monitored file descriptors.
*/
if (WaitForChar(wait_time, &interrupted, FALSE))
{
/* If input was put directly in typeahead buffer bail out here. */
if (typebuf_changed(tb_change_cnt))
return 0;
/*
* For some terminals we only get one character at a time.
* We want the get all available characters, so we could keep on
* trying until none is available
* For some other terminals this is quite slow, that's why we don't
* do it.
*/
len = read_from_input_buf(buf, (long)maxlen);
if (len > 0)
return len;
continue;
}
/* no character available */
#if !(defined(HAVE_GETTIMEOFDAY) && defined(HAVE_SYS_TIME_H))
/* estimate the elapsed time */
elapsed_time += wait_time;
#endif
if (do_resize /* interrupted by SIGWINCH signal */
#ifdef FEAT_CLIENTSERVER
|| server_waiting()
#endif
#ifdef MESSAGE_QUEUE
|| interrupted
#endif
|| wait_time > 0
|| (wtime < 0 && !did_start_blocking))
continue;
/* no character available or interrupted */
break;
}
return 0;
}
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
void
mch_delay(long msec, int ignoreinput)
{
int old_tmode;
#ifdef FEAT_MZSCHEME
long total = msec; /* remember original value */
#endif
if (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). */
in_mch_delay = TRUE;
old_tmode = curr_tmode;
if (curr_tmode == TMODE_RAW)
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
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 void check_stack_growth(char *p);
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.
*/
#ifndef SIGSTKSZ
# define SIGSTKSZ 8000 /* just a guess of how much stack is needed... */
#endif
# ifdef HAVE_SIGALTSTACK
static stack_t sigstk; /* for sigaltstack() */
# else
static struct sigstack sigstk; /* for sigstack() */
# endif
static void init_signal_stack(void);
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 = SIGSTKSZ;
sigstk.ss_flags = 0;
(void)sigaltstack(&sigstk, NULL);
# else
sigstk.ss_sp = signal_stack;
if (stack_grows_downwards)
sigstk.ss_sp += SIGSTKSZ - 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(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