* ruby.c (fill_standard_fds): new function to open closed standard

  file descriptors.
  (ruby_sysinit): call fill_standard_fds.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@33567 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 30 insertions, 0 deletions

diff --git a/ruby.c b/ruby.c
index 2e157c0708..3371772671 100644
--- a/ruby.c
+++ b/ruby.c
@@ -1815,6 +1815,35 @@ ruby_process_options(int argc, char **argv)
     return (void*)(struct RData*)iseq;
 }
 
+static void
+fill_standard_fds(void)
+{
+    int f0, f1, f2, fds[2];
+    f0 = fcntl(0, F_GETFD) == -1 && errno == EBADF;
+    f1 = fcntl(1, F_GETFD) == -1 && errno == EBADF;
+    f2 = fcntl(2, F_GETFD) == -1 && errno == EBADF;
+    if (f0) {
+        if (pipe(fds) == 0) {
+            close(fds[1]);
+            if (fds[0] != 0) {
+                dup2(fds[0], 0);
+                close(fds[0]);
+            }
+        }
+    }
+    if (f1 || f2) {
+        if (pipe(fds) == 0) {
+            close(fds[0]);
+            if (f1 && fds[1] != 1)
+                dup2(fds[1], 1);
+            if (f2 && fds[1] != 2)
+                dup2(fds[1], 2);
+            if (fds[1] != 1 && fds[1] != 2)
+                close(fds[1]);
+        }
+    }
+}
+
 void
 ruby_sysinit(int *argc, char ***argv)
 {
@@ -1827,4 +1856,5 @@ ruby_sysinit(int *argc, char ***argv)
 #if defined(USE_DLN_A_OUT)
     dln_argv0 = origarg.argv[0];
 #endif
+    fill_standard_fds();
 }