oslib-posix: Introduce qemu_socketpair()

qemu_socketpair() will create a pair of connected sockets
with FD_CLOEXEC set

Signed-off-by: Guoyi Tu <tugy@chinatelecom.cn>
Reviewed-by: Christian Schoenebeck <qemu_oss@crudebyte.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <17fa1eff729eeabd9a001f4639abccb127ceec81.1661240709.git.tugy@chinatelecom.cn>

1 files changed, 19 insertions, 0 deletions

diff --git a/util/oslib-posix.c b/util/oslib-posix.c
index d55af69c11..827a7aadba 100644
--- a/util/oslib-posix.c
+++ b/util/oslib-posix.c
@@ -253,6 +253,25 @@ void qemu_set_cloexec(int fd)
     assert(f != -1);
 }
 
+int qemu_socketpair(int domain, int type, int protocol, int sv[2])
+{
+    int ret;
+
+#ifdef SOCK_CLOEXEC
+    ret = socketpair(domain, type | SOCK_CLOEXEC, protocol, sv);
+    if (ret != -1 || errno != EINVAL) {
+        return ret;
+    }
+#endif
+    ret = socketpair(domain, type, protocol, sv);;
+    if (ret == 0) {
+        qemu_set_cloexec(sv[0]);
+        qemu_set_cloexec(sv[1]);
+    }
+
+    return ret;
+}
+
 char *
 qemu_get_local_state_dir(void)
 {