[Qemu-devel] [mips-linux-user] patch for pipe() result handling

[Stuart Anderson <anderson@netsweng.com>]

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pipe(2) on MIPS does some funny, non-standard stuff with it's return
data. This patch implments this unusual handling. Without this patch,
bash closes it's own stdin by mistake and therefore exits immediately
after presenting the prompt.

The LTP test results for the pipe() tests are improved with this patch
as well.


                                 Stuart

Stuart R. Anderson                               anderson@netsweng.com
Network & Software Engineering                   http://www.netsweng.com/
1024D/37A79149:                                  0791 D3B8 9A4C 2CDC A31F
                                                  BD03 0A62 E534 37A7 9149

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Index: qemu/linux-user/syscall.c
===================================================================
--- qemu.orig/linux-user/syscall.c	2007-05-29 22:42:04.000000000 -0400
+++ qemu/linux-user/syscall.c	2007-05-29 22:47:00.000000000 -0400
@@ -2916,8 +2916,13 @@
             int host_pipe[2];
             ret = get_errno(pipe(host_pipe));
             if (!is_error(ret)) {
+#if defined(TARGET_MIPS)
+		((CPUMIPSState*)cpu_env)->gpr[3] = host_pipe[1];
+		ret = host_pipe[0];
+#else
                 tput32(arg1, host_pipe[0]);
                 tput32(arg1 + 4, host_pipe[1]);
+#endif
             }
         }
         break;