linux-user: implement pipe2 [v3]
implement pipe2 syscall.
[v2] fix do_pipe on mips and sh4
[v3] use pipe2 to ensure atomicity, but only when it is available.
Signed-off-by: Riku Voipio <riku.voipio@iki.fi>
diff --git a/configure b/configure
index d3c9140..7961bb3 100755
--- a/configure
+++ b/configure
@@ -1304,6 +1304,24 @@
utimens=yes
fi
+# check if pipe2 is there
+pipe2=no
+cat > $TMPC << EOF
+#define _GNU_SOURCE
+#include <unistd.h>
+#include <fcntl.h>
+
+int main(void)
+{
+ int pipefd[2];
+ pipe2(pipefd, O_CLOEXEC);
+ return 0;
+}
+EOF
+if $cc $ARCH_CFLAGS -o $TMPE $TMPC 2> /dev/null ; then
+ pipe2=yes
+fi
+
# Check if tools are available to build documentation.
if test "$build_docs" = "yes" -a \( ! -x "`which texi2html 2>/dev/null`" -o ! -x "`which pod2man 2>/dev/null`" \) ; then
build_docs="no"
@@ -1704,6 +1722,9 @@
if test "$utimens" = "yes" ; then
echo "#define CONFIG_UTIMENSAT 1" >> $config_h
fi
+if test "$pipe2" = "yes" ; then
+ echo "#define CONFIG_PIPE2 1" >> $config_h
+fi
if test "$inotify" = "yes" ; then
echo "#define CONFIG_INOTIFY 1" >> $config_h
fi
