Make the maximum execve size test use sysconf. Create a fallback if sysconf is unavailable.

darcs-hash:20071015113936-75c98-078e9f8727e91d41fabc80827bf97c8e04dd97ba.gz

configure.ac

@@ -732,7 +732,7 @@ fi
 AC_CHECK_FUNCS( wcsdup wcsndup wcslen wcscasecmp wcsncasecmp fwprintf )
 AC_CHECK_FUNCS( futimes wcwidth wcswidth wcstok fputwc fgetwc )
 AC_CHECK_FUNCS( wcstol wcslcat wcslcpy lrand48_r killpg gettext )
-AC_CHECK_FUNCS( dcgettext backtrace backtrace_symbols)
+AC_CHECK_FUNCS( dcgettext backtrace backtrace_symbols sysconf )
 
 #
 # The Makefile also needs to know if we have gettext, so it knows if

exec.c

@@ -507,6 +507,8 @@ static void launch_process( process_t *p )
 			string_buffer_t sz1;
 			string_buffer_t sz2;
 			
+			long arg_max = -1;
+						
 			sb_init( &sz1 );
 			sb_init( &sz2 );
 						
@@ -521,19 +523,26 @@ static void launch_process( process_t *p )
 			}
 			
 			sb_format_size( &sz1, sz );
+
+			arg_max = sysconf( _SC_ARG_MAX );
 			
-#ifdef ARG_MAX
-			sb_format_size( &sz2, ARG_MAX );
+			if( arg_max > 0 )
+			{
+				
+				sb_format_size( &sz2, ARG_MAX );
+				
+				debug( 0,
+				       L"The total size of the argument and environment lists (%ls) exceeds the system limit of %ls.",
+				       (wchar_t *)sz1.buff,
+				       (wchar_t *)sz2.buff);
+			}
+			else
+			{
+				debug( 0,
+				       L"The total size of the argument and environment lists (%ls) exceeds the system limit.",
+				       (wchar_t *)sz1.buff);
+			}
 			
-			debug( 0,
-			       L"The total size of the argument and environment lists (%ls) exceeds the system limit of %ls.",
-			       (wchar_t *)sz1.buff,
-			       (wchar_t *)sz2.buff);
-#else
-			debug( 0,
-			       L"The total size of the argument and environment lists (%ls) exceeds the system limit.",
-			       (wchar_t *)sz1.buff);
-#endif
 			debug( 0, 
 			       L"Please try running the command again with fewer arguments.");
 			sb_destroy( &sz1 );

fallback.c

@@ -1168,3 +1168,20 @@ char ** backtrace_symbols (void *const *buffer, int size)
 	return 0;
 }
 #endif
+
+#ifndef HAVE_SYSCONF
+
+long sysconf(int name)
+{
+	if( name == _SC_ARG_MAX )
+	{
+#ifdef ARG_MAX
+		return ARG_MAX;
+#endif
+	}
+
+	return -1;
+	
+}
+
+#endif

fallback.h

@@ -435,4 +435,11 @@ int getopt_long(int argc,
 
 #endif
 
+#ifndef HAVE_SYSCONF
+
+#define _SC_ARG_MAX 1
+long sysconf(int name);
+
+#endif
+
 #endif