Fix port to glibc 2.24 (pre-release) + ppc64

[gnu-emacs] / src / sysdep.c

diff --git a/src/sysdep.c b/src/sysdep.c
index 53affbf3dbfd447f94ca614c107872ebba7cfd48..16541735f036ec31a466411727d5eea3aa856742 100644 (file)
--- a/src/sysdep.c
+++ b/src/sysdep.c
@@ -107,7 +107,6 @@ along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
 /* In process.h which conflicts with the local copy.  */
 #define _P_WAIT 0
 int _cdecl _spawnlp (int, const char *, const char *, ...);
-int _cdecl _getpid (void);
 /* The following is needed for O_CLOEXEC, F_SETFD, FD_CLOEXEC, and
    several prototypes of functions called below.  */
 #include <sys/socket.h>
@@ -130,6 +129,48 @@ static const int baud_convert[] =
     1800, 2400, 4800, 9600, 19200, 38400
   };
 
+#ifdef HAVE_PERSONALITY_ADDR_NO_RANDOMIZE
+# include <sys/personality.h>
+
+/* Disable address randomization in the current process.  Return true
+   if addresses were randomized but this has been disabled, false
+   otherwise. */
+bool
+disable_address_randomization (void)
+{
+  bool disabled = false;
+  int pers = personality (0xffffffff);
+  disabled = (! (pers & ADDR_NO_RANDOMIZE)
+             && 0 <= personality (pers | ADDR_NO_RANDOMIZE));
+  return disabled;
+}
+#endif
+
+/* Execute the program in FILE, with argument vector ARGV and environ
+   ENVP.  Return an error number if unsuccessful.  This is like execve
+   except it reenables ASLR in the executed program if necessary, and
+   on error it returns an error number rather than -1.  */
+int
+emacs_exec_file (char const *file, char *const *argv, char *const *envp)
+{
+#ifdef HAVE_PERSONALITY_ADDR_NO_RANDOMIZE
+  int pers = getenv ("EMACS_HEAP_EXEC") ? personality (0xffffffff) : -1;
+  bool change_personality = 0 <= pers && pers & ADDR_NO_RANDOMIZE;
+  if (change_personality)
+    personality (pers & ~ADDR_NO_RANDOMIZE);
+#endif
+
+  execve (file, argv, envp);
+  int err = errno;
+
+#ifdef HAVE_PERSONALITY_ADDR_NO_RANDOMIZE
+  if (change_personality)
+    personality (pers);
+#endif
+
+  return err;
+}
+
 /* If FD is not already open, arrange for it to be open with FLAGS.  */
 static void
 force_open (int fd, int flags)
@@ -507,15 +548,16 @@ void
 sys_subshell (void)
 {
 #ifdef DOS_NT  /* Demacs 1.1.2 91/10/20 Manabu Higashida */
-  int st;
 #ifdef MSDOS
+  int st;
   char oldwd[MAXPATHLEN+1]; /* Fixed length is safe on MSDOS.  */
 #else
   char oldwd[MAX_UTF8_PATH];
-#endif
+#endif /* MSDOS */
+#else  /* !DOS_NT */
+  int status;
 #endif
   pid_t pid;
-  int status;
   struct save_signal saved_handlers[5];
   char *str = SSDATA (encode_current_directory ());
 
@@ -938,7 +980,9 @@ void
 init_sys_modes (struct tty_display_info *tty_out)
 {
   struct emacs_tty tty;
+#ifndef DOS_NT
   Lisp_Object terminal;
+#endif
 
   Vtty_erase_char = Qnil;
 
@@ -2496,7 +2540,7 @@ void
 emacs_perror (char const *message)
 {
   int err = errno;
-  char const *error_string = strerror (err);
+  char const *error_string = emacs_strerror (err);
   char const *command = (initial_argv && initial_argv[0]
                         ? initial_argv[0] : "emacs");
   /* Write it out all at once, if it's short; this is less likely to
@@ -3863,7 +3907,7 @@ str_collate (Lisp_Object s1, Lisp_Object s2,
       locale_t loc = newlocale (LC_COLLATE_MASK | LC_CTYPE_MASK,
                                SSDATA (locale), 0);
       if (!loc)
-       error ("Invalid locale %s: %s", SSDATA (locale), strerror (errno));
+       error ("Invalid locale %s: %s", SSDATA (locale), emacs_strerror (errno));
 
       if (! NILP (ignore_case))
        for (int i = 1; i < 3; i++)
@@ -3894,10 +3938,10 @@ str_collate (Lisp_Object s1, Lisp_Object s2,
     }
 #  ifndef HAVE_NEWLOCALE
   if (err)
-    error ("Invalid locale or string for collation: %s", strerror (err));
+    error ("Invalid locale or string for collation: %s", emacs_strerror (err));
 #  else
   if (err)
-    error ("Invalid string for collation: %s", strerror (err));
+    error ("Invalid string for collation: %s", emacs_strerror (err));
 #  endif
 
   SAFE_FREE ();
@@ -3915,7 +3959,7 @@ str_collate (Lisp_Object s1, Lisp_Object s2,
   int res, err = errno;
 
   errno = 0;
-  res = w32_compare_strings (SDATA (s1), SDATA (s2), loc, !NILP (ignore_case));
+  res = w32_compare_strings (SSDATA (s1), SSDATA (s2), loc, !NILP (ignore_case));
   if (errno)
     error ("Invalid string for collation: %s", strerror (errno));