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[Qemu-devel] [5334] Make compatfd fallback more robust
From: |
Anthony Liguori |
Subject: |
[Qemu-devel] [5334] Make compatfd fallback more robust |
Date: |
Sat, 27 Sep 2008 20:58:44 +0000 |
Revision: 5334
http://svn.sv.gnu.org/viewvc/?view=rev&root=qemu&revision=5334
Author: aliguori
Date: 2008-09-27 20:58:43 +0000 (Sat, 27 Sep 2008)
Log Message:
-----------
Make compatfd fallback more robust
Be more friendly when signalfd() fails, and also add configure checks to detect
that syscall(SYS_signalfd) actually works. malc pointed out that some installs
do not have /usr/include/linux headers that are in sync with the glibc headers
so why SYS_signalfd is defined, it's #defined to _NR_signalfd which is not
defined in the /usr/include/linux header.
While this is a distro bug, it doesn't hurt to do a more thorough job in
detection.
Signed-off-by: Anthony Liguori <address@hidden>
Modified Paths:
--------------
trunk/block-raw-posix.c
trunk/compatfd.c
trunk/configure
Modified: trunk/block-raw-posix.c
===================================================================
--- trunk/block-raw-posix.c 2008-09-27 20:41:11 UTC (rev 5333)
+++ trunk/block-raw-posix.c 2008-09-27 20:58:43 UTC (rev 5334)
@@ -584,6 +584,10 @@
s->first_aio = NULL;
s->fd = qemu_signalfd(&mask);
+ if (s->fd == -1) {
+ fprintf(stderr, "failed to create signalfd\n");
+ return -errno;
+ }
fcntl(s->fd, F_SETFL, O_NONBLOCK);
Modified: trunk/compatfd.c
===================================================================
--- trunk/compatfd.c 2008-09-27 20:41:11 UTC (rev 5333)
+++ trunk/compatfd.c 2008-09-27 20:58:43 UTC (rev 5334)
@@ -100,11 +100,11 @@
int qemu_signalfd(const sigset_t *mask)
{
-#if defined(SYS_signalfd)
+#if defined(CONFIG_signalfd)
int ret;
ret = syscall(SYS_signalfd, -1, mask, _NSIG / 8);
- if (!(ret == -1 && errno == ENOSYS))
+ if (ret != -1)
return ret;
#endif
@@ -113,15 +113,14 @@
int qemu_eventfd(int *fds)
{
-#if defined(SYS_eventfd)
+#if defined(CONFIG_eventfd)
int ret;
ret = syscall(SYS_eventfd, 0);
if (ret >= 0) {
fds[0] = fds[1] = ret;
return 0;
- } else if (!(ret == -1 && errno == ENOSYS))
- return ret;
+ }
#endif
return pipe(fds);
Modified: trunk/configure
===================================================================
--- trunk/configure 2008-09-27 20:41:11 UTC (rev 5333)
+++ trunk/configure 2008-09-27 20:58:43 UTC (rev 5334)
@@ -110,6 +110,8 @@
aio="yes"
nptl="yes"
mixemu="no"
+signalfd="no"
+eventfd="no"
# OS specific
targetos=`uname -s`
@@ -901,6 +903,33 @@
fi
fi
+##########################################
+# signalfd probe
+cat > $TMPC << EOF
+#define _GNU_SOURCE
+#include <unistd.h>
+#include <sys/syscall.h>
+#include <signal.h>
+int main(void) { return syscall(SYS_signalfd, -1, NULL, _NSIG / 8); }
+EOF
+
+if $cc $ARCH_CFLAGS -o $TMPE $TMPC 2> /dev/null ; then
+ signalfd=yes
+fi
+
+##########################################
+# eventfd probe
+cat > $TMPC << EOF
+#define _GNU_SOURCE
+#include <unistd.h>
+#include <sys/syscall.h>
+int main(void) { return syscall(SYS_eventfd, 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 [ -x "`which texi2html 2>/dev/null`" ] && \
[ -x "`which pod2man 2>/dev/null`" ]; then
@@ -1229,6 +1258,12 @@
echo "#define CONFIG_AIO 1" >> $config_h
echo "CONFIG_AIO=yes" >> $config_mak
fi
+if test "$signalfd" = "yes" ; then
+ echo "#define CONFIG_signalfd 1" >> $config_h
+fi
+if test "$eventfd" = "yes" ; then
+ echo "#define CONFIG_eventfd 1" >> $config_h
+fi
# XXX: suppress that
if [ "$bsd" = "yes" ] ; then
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