X-Git-Url: https://git.saurik.com/bison.git/blobdiff_plain/0fb669f9d648dfdd7a39478a6b658511455ae966..e3c52a63624c102a41f60bc741294cd3f23ceb89:/lib/subpipe.c

diff --git a/lib/subpipe.c b/lib/subpipe.c
index 786de26b..a0cfc811 100644
--- a/lib/subpipe.c
+++ b/lib/subpipe.c
@@ -1,11 +1,11 @@
 /* Subprocesses with pipes.
 
-   Copyright (C) 2002, 2004 Free Software Foundation, Inc.
+   Copyright (C) 2002, 2004, 2005, 2006 Free Software Foundation, Inc.
 
-   This program is free software; you can redistribute it and/or modify
+   This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
-   the Free Software Foundation; either version 2, or (at your option)
-   any later version.
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
 
    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ -13,15 +13,12 @@
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
-   along with this program; if not, write to the Free Software Foundation,
-   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
 /* Written by Paul Eggert <eggert@twinsun.com>
    and Florian Krohm <florian@edamail.fishkill.ibm.com>.  */
 
-#if HAVE_CONFIG_H
-# include <config.h>
-#endif
+#include <config.h>
 
 #include "subpipe.h"
 
@@ -34,9 +31,7 @@
 
 #include <stdlib.h>
 
-#if HAVE_UNISTD_H
-# include <unistd.h>
-#endif
+#include <unistd.h>
 #ifndef STDIN_FILENO
 # define STDIN_FILENO 0
 #endif
@@ -44,9 +39,7 @@
 # define STDOUT_FILENO 1
 #endif
 #if ! HAVE_DUP2 && ! defined dup2
-# if HAVE_FCNTL_H
-#  include <fcntl.h>
-# endif
+# include <fcntl.h>
 # define dup2(f, t) (close (t), fcntl (f, F_DUPFD, t))
 #endif
 
@@ -68,10 +61,23 @@
 #endif
 
 #include "error.h"
+#include "unistd-safer.h"
 
 #include "gettext.h"
 #define _(Msgid)  gettext (Msgid)
 
+#ifndef __attribute__
+/* This feature is available in gcc versions 2.5 and later.  */
+# if ! defined __GNUC__ || __GNUC__ < 2 || \
+(__GNUC__ == 2 && __GNUC_MINOR__ < 5) || __STRICT_ANSI__
+#  define __attribute__(Spec) /* empty */
+# endif
+#endif
+
+#ifndef ATTRIBUTE_UNUSED
+# define ATTRIBUTE_UNUSED __attribute__ ((__unused__))
+#endif
+
 
 /* Initialize this module.  */
 
@@ -99,21 +105,14 @@ pid_t
 create_subpipe (char const * const *argv, int fd[2])
 {
   int pipe_fd[2];
-  int from_in_fd;
-  int from_out_fd;
-  int to_in_fd;
-  int to_out_fd;
+  int child_fd[2];
   pid_t pid;
 
-  if (pipe (pipe_fd) != 0)
+  if (pipe_safer (child_fd) != 0 || pipe_safer (pipe_fd) != 0)
     error (EXIT_FAILURE, errno, "pipe");
-  to_in_fd = pipe_fd[0];
-  to_out_fd = pipe_fd[1];
-
-  if (pipe (pipe_fd) != 0)
-    error (EXIT_FAILURE, errno, "pipe");
-  from_in_fd = pipe_fd[0];
-  from_out_fd = pipe_fd[1];
+  fd[0] = child_fd[1];
+  fd[1] = pipe_fd[0];
+  child_fd[1] = pipe_fd[1];
 
   pid = vfork ();
   if (pid < 0)
@@ -122,33 +121,24 @@ create_subpipe (char const * const *argv, int fd[2])
   if (! pid)
     {
       /* Child.  */
-      close (to_out_fd);
-      close (from_in_fd);
-
-      if (to_in_fd != STDIN_FILENO)
-	{
-	  dup2 (to_in_fd, STDIN_FILENO);
-	  close (to_in_fd);
-	}
-      if (from_out_fd != STDOUT_FILENO)
-	{
-	  dup2 (from_out_fd, STDOUT_FILENO);
-	  close (from_out_fd);
-	}
+      close (fd[0]);
+      close (fd[1]);
+      dup2 (child_fd[0], STDIN_FILENO);
+      close (child_fd[0]);
+      dup2 (child_fd[1], STDOUT_FILENO);
+      close (child_fd[1]);
 
       /* The cast to (char **) rather than (char * const *) is needed
 	 for portability to older hosts with a nonstandard prototype
 	 for execvp.  */
       execvp (argv[0], (char **) argv);
-    
+
       _exit (errno == ENOENT ? 127 : 126);
     }
 
   /* Parent.  */
-  close (to_in_fd);
-  close (from_out_fd);
-  fd[0] = to_out_fd;
-  fd[1] = from_in_fd;
+  close (child_fd[0]);
+  close (child_fd[1]);
   return pid;
 }
 
@@ -178,3 +168,9 @@ reap_subpipe (pid_t pid, char const *program)
     }
 #endif
 }
+
+void
+end_of_output_subpipe (pid_t pid ATTRIBUTE_UNUSED,
+		       int fd[2] ATTRIBUTE_UNUSED)
+{
+}