X-Git-Url: https://code.delx.au/gnu-emacs/blobdiff_plain/c558890bde00f4b5079edd2c1d0d51086af3b13b..63750fd4ed4ff8bb9b3ff8868d4e36e3422adb21:/src/emacs.c
diff --git a/src/emacs.c b/src/emacs.c
index 95d1905ae2..53bcc9879a 100644
--- a/src/emacs.c
+++ b/src/emacs.c
@@ -54,13 +54,18 @@ along with GNU Emacs. If not, see . */
#ifdef MSDOS
#include
+#include "dosfns.h"
+#endif
+
+#ifdef HAVE_LIBSYSTEMD
+# include
+# include
#endif
#ifdef HAVE_WINDOW_SYSTEM
#include TERM_HEADER
#endif /* HAVE_WINDOW_SYSTEM */
-#include "coding.h"
#include "intervals.h"
#include "character.h"
#include "buffer.h"
@@ -85,6 +90,7 @@ along with GNU Emacs. If not, see . */
#include "systime.h"
#include "puresize.h"
+#include "getpagesize.h"
#include "gnutls.h"
#if (defined PROFILING \
@@ -106,10 +112,6 @@ extern void moncontrol (int mode);
#include
#endif
-#ifdef HAVE_PERSONALITY_LINUX32
-#include
-#endif
-
static const char emacs_version[] = PACKAGE_VERSION;
static const char emacs_copyright[] = COPYRIGHT;
static const char emacs_bugreport[] = PACKAGE_BUGREPORT;
@@ -666,9 +668,6 @@ main (int argc, char **argv)
bool do_initial_setlocale;
bool dumping;
int skip_args = 0;
-#ifdef HAVE_SETRLIMIT
- struct rlimit rlim;
-#endif
bool no_loadup = 0;
char *junk = 0;
char *dname_arg = 0;
@@ -682,6 +681,30 @@ main (int argc, char **argv)
stack_base = &dummy;
+ dumping = !initialized && (strcmp (argv[argc - 1], "dump") == 0
+ || strcmp (argv[argc - 1], "bootstrap") == 0);
+
+ /* True if address randomization interferes with memory allocaiton. */
+# ifdef __PPC64__
+ bool disable_aslr = true;
+# else
+ bool disable_aslr = dumping;
+# endif
+
+ if (disable_aslr && disable_address_randomization ())
+ {
+ /* Set this so the personality will be reverted before execs
+ after this one. */
+ xputenv ("EMACS_HEAP_EXEC=true");
+
+ /* Address randomization was enabled, but is now disabled.
+ Re-execute Emacs to get a clean slate. */
+ execvp (argv[0], argv);
+
+ /* If the exec fails, warn and then try anyway. */
+ perror (argv[0]);
+ }
+
#ifndef CANNOT_DUMP
might_dump = !initialized;
#endif
@@ -721,6 +744,7 @@ main (int argc, char **argv)
unexec_init_emacs_zone ();
#endif
+ init_standard_fds ();
atexit (close_output_streams);
#ifdef HAVE_MODULES
@@ -789,28 +813,6 @@ main (int argc, char **argv)
}
}
- dumping = !initialized && (strcmp (argv[argc - 1], "dump") == 0
- || strcmp (argv[argc - 1], "bootstrap") == 0);
-
-#ifdef HAVE_PERSONALITY_LINUX32
- if (dumping && ! getenv ("EMACS_HEAP_EXEC"))
- {
- /* Set this so we only do this once. */
- xputenv ("EMACS_HEAP_EXEC=true");
-
- /* A flag to turn off address randomization which is introduced
- in linux kernel shipped with fedora core 4 */
-#define ADD_NO_RANDOMIZE 0x0040000
- personality (PER_LINUX32 | ADD_NO_RANDOMIZE);
-#undef ADD_NO_RANDOMIZE
-
- execvp (argv[0], argv);
-
- /* If the exec fails, try to dump anyway. */
- emacs_perror (argv[0]);
- }
-#endif /* HAVE_PERSONALITY_LINUX32 */
-
#if defined (HAVE_SETRLIMIT) && defined (RLIMIT_STACK) && !defined (CYGWIN)
/* Extend the stack space available. Don't do that if dumping,
since some systems (e.g. DJGPP) might define a smaller stack
@@ -818,38 +820,54 @@ main (int argc, char **argv)
is built with an 8MB stack. Moreover, the setrlimit call can
cause problems on Cygwin
(https://www.cygwin.com/ml/cygwin/2015-07/msg00096.html). */
- if (1
-#ifndef CANNOT_DUMP
- && (!noninteractive || initialized)
-#endif
- && !getrlimit (RLIMIT_STACK, &rlim))
+ struct rlimit rlim;
+ if (getrlimit (RLIMIT_STACK, &rlim) == 0
+ && 0 <= rlim.rlim_cur && rlim.rlim_cur <= LONG_MAX)
{
- long newlim;
- /* Approximate the amount regex.c needs per unit of re_max_failures. */
+ long lim = rlim.rlim_cur;
+
+ /* Approximate the amount regex.c needs per unit of
+ re_max_failures, then add 33% to cover the size of the
+ smaller stacks that regex.c successively allocates and
+ discards on its way to the maximum. */
int ratio = 20 * sizeof (char *);
- /* Then add 33% to cover the size of the smaller stacks that regex.c
- successively allocates and discards, on its way to the maximum. */
ratio += ratio / 3;
- /* Add in some extra to cover
- what we're likely to use for other reasons. */
- newlim = re_max_failures * ratio + 200000;
-#ifdef __NetBSD__
- /* NetBSD (at least NetBSD 1.2G and former) has a bug in its
- stack allocation routine for new process that the allocation
- fails if stack limit is not on page boundary. So, round up the
- new limit to page boundary. */
- newlim = (newlim + getpagesize () - 1) / getpagesize () * getpagesize ();
-#endif
- if (newlim > rlim.rlim_max)
+
+ /* Extra space to cover what we're likely to use for other reasons. */
+ int extra = 200000;
+
+ bool try_to_grow_stack = true;
+#ifndef CANNOT_DUMP
+ try_to_grow_stack = !noninteractive || initialized;
+#endif
+
+ if (try_to_grow_stack)
{
- newlim = rlim.rlim_max;
- /* Don't let regex.c overflow the stack we have. */
- re_max_failures = (newlim - 200000) / ratio;
+ long newlim = re_max_failures * ratio + extra;
+
+ /* Round the new limit to a page boundary; this is needed
+ for Darwin kernel 15.4.0 (see Bug#23622) and perhaps
+ other systems. Do not shrink the stack and do not exceed
+ rlim_max. Don't worry about exact values of
+ RLIM_INFINITY etc. since in practice when they are
+ nonnegative they are so large that the code does the
+ right thing anyway. */
+ long pagesize = getpagesize ();
+ newlim += pagesize - 1;
+ if (0 <= rlim.rlim_max && rlim.rlim_max < newlim)
+ newlim = rlim.rlim_max;
+ newlim -= newlim % pagesize;
+
+ if (pagesize <= newlim - lim)
+ {
+ rlim.rlim_cur = newlim;
+ if (setrlimit (RLIMIT_STACK, &rlim) == 0)
+ lim = newlim;
+ }
}
- if (rlim.rlim_cur < newlim)
- rlim.rlim_cur = newlim;
- setrlimit (RLIMIT_STACK, &rlim);
+ /* Don't let regex.c overflow the stack. */
+ re_max_failures = lim < extra ? 0 : min (lim - extra, SIZE_MAX) / ratio;
}
#endif /* HAVE_SETRLIMIT and RLIMIT_STACK and not CYGWIN */
@@ -899,24 +917,25 @@ main (int argc, char **argv)
char *term;
if (argmatch (argv, argc, "-t", "--terminal", 4, &term, &skip_args))
{
- int result;
- emacs_close (0);
- emacs_close (1);
- result = emacs_open (term, O_RDWR, 0);
- if (result < 0 || fcntl (0, F_DUPFD_CLOEXEC, 1) < 0)
+ emacs_close (STDIN_FILENO);
+ emacs_close (STDOUT_FILENO);
+ int result = emacs_open (term, O_RDWR, 0);
+ if (result != STDIN_FILENO
+ || (fcntl (STDIN_FILENO, F_DUPFD_CLOEXEC, STDOUT_FILENO)
+ != STDOUT_FILENO))
{
char *errstring = strerror (errno);
fprintf (stderr, "%s: %s: %s\n", argv[0], term, errstring);
- exit (1);
+ exit (EXIT_FAILURE);
}
- if (! isatty (0))
+ if (! isatty (STDIN_FILENO))
{
fprintf (stderr, "%s: %s: not a tty\n", argv[0], term);
- exit (1);
+ exit (EXIT_FAILURE);
}
fprintf (stderr, "Using %s\n", term);
#ifdef HAVE_WINDOW_SYSTEM
- inhibit_window_system = 1; /* -t => -nw */
+ inhibit_window_system = true; /* -t => -nw */
#endif
}
else
@@ -964,6 +983,9 @@ main (int argc, char **argv)
w32_daemon_event = NULL;
#endif
+
+ int sockfd = -1;
+
if (argmatch (argv, argc, "-daemon", "--daemon", 5, NULL, &skip_args)
|| argmatch (argv, argc, "-daemon", "--daemon", 5, &dname_arg, &skip_args))
{
@@ -997,6 +1019,21 @@ main (int argc, char **argv)
exit (1);
}
+#ifdef HAVE_LIBSYSTEMD
+ /* Read the number of sockets passed through by systemd. */
+ int systemd_socket = sd_listen_fds (1);
+
+ if (systemd_socket > 1)
+ fprintf (stderr,
+ ("\n"
+ "Warning: systemd passed more than one socket to Emacs.\n"
+ "Try 'Accept=false' in the Emacs socket unit file.\n"));
+ else if (systemd_socket == 1
+ && (0 < sd_is_socket (SD_LISTEN_FDS_START,
+ AF_UNSPEC, SOCK_STREAM, 1)))
+ sockfd = SD_LISTEN_FDS_START;
+#endif /* HAVE_LIBSYSTEMD */
+
#ifndef DAEMON_MUST_EXEC
#ifdef USE_GTK
fprintf (stderr, "\nWarning: due to a long standing Gtk+ bug\nhttp://bugzilla.gnome.org/show_bug.cgi?id=85715\n\
@@ -1209,7 +1246,7 @@ Using an Emacs configured with --with-x-toolkit=lucid does not have this problem
/* Started from GUI? */
/* FIXME: Do the right thing if getenv returns NULL, or if
chdir fails. */
- if (! inhibit_window_system && ! isatty (0) && ! ch_to_dir)
+ if (! inhibit_window_system && ! isatty (STDIN_FILENO) && ! ch_to_dir)
chdir (getenv ("HOME"));
if (skip_args < argc)
{
@@ -1312,16 +1349,6 @@ Using an Emacs configured with --with-x-toolkit=lucid does not have this problem
globals_of_gfilenotify ();
#endif
-#ifdef WINDOWSNT
- globals_of_w32 ();
-#ifdef HAVE_W32NOTIFY
- globals_of_w32notify ();
-#endif
- /* Initialize environment from registry settings. */
- init_environment (argv);
- init_ntproc (dumping); /* must precede init_editfns. */
-#endif
-
#ifdef HAVE_NS
/* Initialize the locale from user defaults. */
ns_init_locale ();
@@ -1338,6 +1365,20 @@ Using an Emacs configured with --with-x-toolkit=lucid does not have this problem
if (! dumping)
set_initial_environment ();
+#ifdef WINDOWSNT
+ globals_of_w32 ();
+#ifdef HAVE_W32NOTIFY
+ globals_of_w32notify ();
+#endif
+ /* Initialize environment from registry settings. Make sure to do
+ this only after calling set_initial_environment so that
+ Vinitial_environment and Vprocess_environment will contain only
+ variables from the parent process without modifications from
+ Emacs. */
+ init_environment (argv);
+ init_ntproc (dumping); /* must precede init_editfns. */
+#endif
+
/* AIX crashes are reported in system versions 3.2.3 and 3.2.4
if this is not done. Do it after set_global_environment so that we
don't pollute Vglobal_environment. */
@@ -1553,7 +1594,7 @@ Using an Emacs configured with --with-x-toolkit=lucid does not have this problem
/* This can create a thread that may call getenv, so it must follow
all calls to putenv and setenv. Also, this sets up
add_keyboard_wait_descriptor, which init_display uses. */
- init_process_emacs ();
+ init_process_emacs (sockfd);
init_keyboard (); /* This too must precede init_sys_modes. */
if (!noninteractive)
@@ -2186,6 +2227,15 @@ synchronize_system_messages_locale (void)
#endif
}
#endif /* HAVE_SETLOCALE */
+
+/* Return a diagnostic string for ERROR_NUMBER, in the wording
+ and encoding appropriate for the current locale. */
+char *
+emacs_strerror (int error_number)
+{
+ synchronize_system_messages_locale ();
+ return strerror (error_number);
+}
Lisp_Object
@@ -2357,9 +2407,9 @@ from the parent process and its tty file descriptors. */)
/* Get rid of stdin, stdout and stderr. */
nfd = emacs_open ("/dev/null", O_RDWR, 0);
err |= nfd < 0;
- err |= dup2 (nfd, 0) < 0;
- err |= dup2 (nfd, 1) < 0;
- err |= dup2 (nfd, 2) < 0;
+ err |= dup2 (nfd, STDIN_FILENO) < 0;
+ err |= dup2 (nfd, STDOUT_FILENO) < 0;
+ err |= dup2 (nfd, STDERR_FILENO) < 0;
err |= emacs_close (nfd) != 0;
/* Closing the pipe will notify the parent that it can exit.