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[Qemu-devel] linux-user: add eventfd support
From: |
riku . voipio |
Subject: |
[Qemu-devel] linux-user: add eventfd support |
Date: |
Tue, 21 Jul 2009 23:58:04 +0300 |
From: Riku Voipio <address@hidden>
Straightforward implementation. This syscall is rare enough that we
don't need to support the odder cases, just disable it if host glibc
is too old.
Signed-off-by: Riku Voipio <address@hidden>
---
configure | 18 ++++++++++++++++++
linux-user/syscall.c | 13 +++++++++++++
2 files changed, 31 insertions(+), 0 deletions(-)
diff --git a/configure b/configure
index 0db885b..8a7399f 100755
--- a/configure
+++ b/configure
@@ -1366,6 +1366,21 @@ if $cc $ARCH_CFLAGS -o $TMPE $TMPC 2> /dev/null ; then
splice=yes
fi
+# check if eventfd is supported
+eventfd=no
+cat > $TMPC << EOF
+#include <sys/eventfd.h>
+
+int main(void)
+{
+ int efd = eventfd(0, 0);
+ return 0;
+}
+EOF
+if $cc $ARCH_CFLAGS -o $TMPE $TMPC 2> /dev/null ; then
+ eventfd=yes
+fi
+
# Check if tools are available to build documentation.
if test "$build_docs" = "yes" -a \( ! -x "`which texi2html 2>/dev/null`" -o !
-x "`which pod2man 2>/dev/null`" \) ; then
build_docs="no"
@@ -1715,6 +1730,9 @@ fi
if test "$splice" = "yes" ; then
echo "#define CONFIG_SPLICE 1" >> $config_host_h
fi
+if test "$eventfd" = "yes" ; then
+ echo "#define CONFIG_EVENTFD 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 7b57323..081cb34 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -6966,6 +6966,19 @@ abi_long do_syscall(void *cpu_env, int num, abi_long
arg1,
break;
#endif
#endif /* CONFIG_SPLICE */
+#ifdef CONFIG_EVENTFD
+#include <sys/eventfd.h>
+#if defined(TARGET_NR_eventfd)
+ case TARGET_NR_eventfd:
+ ret = get_errno(eventfd(arg1, 0));
+ break;
+#endif
+#if defined(TARGET_NR_eventfd2)
+ case TARGET_NR_eventfd2:
+ ret = get_errno(eventfd(arg1, arg2));
+ break;
+#endif
+#endif /* CONFIG_EVENTFD */
default:
unimplemented:
gemu_log("qemu: Unsupported syscall: %d\n", num);
--
1.6.2.1