win32: ash: copyfd(): work around fcntl(F_DUPFD)

1 files changed, 12 insertions, 0 deletions

diff --git a/shell/ash.c b/shell/ash.c
index 007d501f9..3380e573e 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -5126,6 +5126,18 @@ copyfd(int from, int to)
                 /*if (from != to)*/
                         newfd = dup2(from, to);
         } else {
+                if (ENABLE_PLATFORM_MINGW32) {
+                        char* fds = ckmalloc(to);
+                        int i,fd;
+                        memset(fds,0,to);
+                        while ((fd = dup(from)) < to && fd >= 0)
+                                fds[fd] = 1;
+                        for (i = 0;i < to;i ++)
+                                if (fds[i])
+                                        close(i);
+                        free(fds);
+                        return fd;
+                }
                 newfd = fcntl(from, F_DUPFD, to);
         }
         if (newfd < 0) {