[Qemu-devel] [PATCH 7/9] linux-user: dup3, fallocate syscalls

[Ulrich Hecht]

implementations of dup3 and fallocate that are good enough to fool LTP

dup3 check, fallocate check fixed
use compile_prog

Signed-off-by: Ulrich Hecht <address@hidden>
---
 configure            |   36 ++++++++++++++++++++++++++++++++++++
 linux-user/syscall.c |   10 ++++++++++
 2 files changed, 46 insertions(+), 0 deletions(-)

diff --git a/configure b/configure
index 64be51f..30ecd8f 100755
--- a/configure
+++ b/configure
@@ -1573,6 +1573,36 @@ if compile_prog "" "" ; then
   eventfd=yes
 fi
 
+# check for fallocate
+fallocate=no
+cat > $TMPC << EOF
+#include <fcntl.h>
+
+int main(void)
+{
+    fallocate(0, 0, 0, 0);
+    return 0;
+}
+EOF
+if compile_prog "" "" ; then
+  fallocate=yes
+fi
+
+# check for dup3
+dup3=no
+cat > $TMPC << EOF
+#include <unistd.h>
+
+int main(void)
+{
+    dup3(0, 0, 0);
+    return 0;
+}
+EOF
+if compile_prog "" "" ; then
+  dup3=yes
+fi
+
 # Check if tools are available to build documentation.
 if test "$docs" != "no" ; then
   if test -x "`which texi2html 2>/dev/null`" -a \
@@ -1954,6 +1984,12 @@ fi
 if test "$eventfd" = "yes" ; then
   echo "CONFIG_EVENTFD=y" >> $config_host_mak
 fi
+if test "$fallocate" = "yes" ; then
+  echo "CONFIG_FALLOCATE=y" >> $config_host_mak
+fi
+if test "$dup3" = "yes" ; then
+  echo "CONFIG_DUP3=y" >> $config_host_mak
+fi
 if test "$inotify" = "yes" ; then
   echo "CONFIG_INOTIFY=y" >> $config_host_mak
 fi
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index f2a53d5..4991154 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -4747,6 +4747,11 @@ abi_long do_syscall(void *cpu_env, int num, abi_long 
arg1,
     case TARGET_NR_dup2:
         ret = get_errno(dup2(arg1, arg2));
         break;
+#if defined(TARGET_NR_dup3) && defined(CONFIG_DUP3)
+    case TARGET_NR_dup3:
+        ret = get_errno(dup3(arg1, arg2, arg3));
+        break;
+#endif
 #ifdef TARGET_NR_getppid /* not on alpha */
     case TARGET_NR_getppid:
         ret = get_errno(getppid());
@@ -7022,6 +7027,11 @@ abi_long do_syscall(void *cpu_env, int num, abi_long 
arg1,
         break;
 #endif
 #endif /* CONFIG_EVENTFD  */
+#if defined(CONFIG_FALLOCATE) && defined(TARGET_NR_fallocate)
+    case TARGET_NR_fallocate:
+        ret = get_errno(fallocate(arg1, arg2, arg3, arg4));
+        break;
+#endif
     default:
     unimplemented:
         gemu_log("qemu: Unsupported syscall: %d\n", num);
-- 
1.6.2.1