[Qemu-devel] [PATCH 1/7] linux-user: dup3, fallocate syscalls

[Ulrich Hecht <uli@suse.de>]

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

Signed-off-by: Ulrich Hecht <uli@suse.de>
---
 configure            |   18 ++++++++++++++++++
 linux-user/syscall.c |   10 ++++++++++
 2 files changed, 28 insertions(+), 0 deletions(-)

diff --git a/configure b/configure
index 09c8443..68a18f5 100755
--- a/configure
+++ b/configure
@@ -1371,6 +1371,21 @@ if $cc $ARCH_CFLAGS -o $TMPE $TMPC 2> /dev/null ; then
   splice=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 $cc $ARCH_CFLAGS -o $TMPE $TMPC 2> /dev/null ; then
+  fallocate=yes
+fi
+
 # Check if tools are available to build documentation.
 if test "$build_docs" = "yes" -a \( ! -x "`which texi2html 2>/dev/null`" -o ! -x "`which pod2man 2>/dev/null`" \) ; then
   build_docs="no"
@@ -1720,6 +1735,9 @@ fi
 if test "$splice" = "yes" ; then
   echo "#define CONFIG_SPLICE 1" >> $config_host_h
 fi
+if test "$fallocate" = "yes" ; then
+  echo "#define CONFIG_FALLOCATE 1" >> $config_host_h
+fi
 if test "$inotify" = "yes" ; then
   echo "#define CONFIG_INOTIFY 1" >> $config_host_h
 fi
diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index ca57dd9..b03e879 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -4723,6 +4723,11 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
     case TARGET_NR_dup2:
         ret = get_errno(dup2(arg1, arg2));
         break;
+#ifdef TARGET_NR_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());
@@ -6975,6 +6980,11 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
         break;
 #endif
 #endif /* CONFIG_SPLICE */
+#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