[PATCH 1/2] osdeps: Introduce qemu_socketpair()

[tugy]

From: Guoyi Tu <tugy@chinatelecom.cn>

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

Signed-off-by: Guoyi Tu <tugy@chinatelecom.cn>
---
 include/qemu/sockets.h |  3 +++
 util/osdep.c           | 24 ++++++++++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/include/qemu/sockets.h b/include/qemu/sockets.h
index 038faa157f..52cf2855df 100644
--- a/include/qemu/sockets.h
+++ b/include/qemu/sockets.h
@@ -14,6 +14,9 @@ int inet_aton(const char *cp, struct in_addr *ia);
 /* misc helpers */
 bool fd_is_socket(int fd);
 int qemu_socket(int domain, int type, int protocol);
+#ifndef WIN32
+int qemu_socketpair(int domain, int type, int protocol, int sv[2]);
+#endif
 int qemu_accept(int s, struct sockaddr *addr, socklen_t *addrlen);
 int socket_set_cork(int fd, int v);
 int socket_set_nodelay(int fd);
diff --git a/util/osdep.c b/util/osdep.c
index 60fcbbaebe..4b1ab623c7 100644
--- a/util/osdep.c
+++ b/util/osdep.c
@@ -481,6 +481,30 @@ int qemu_socket(int domain, int type, int protocol)
     return ret;
 }
 
+#ifndef _WIN32
+/*
+ * Create a pair of connected sockets with FD_CLOEXEC set
+ */
+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;
+}
+#endif
+
 /*
  * Accept a connection and set FD_CLOEXEC
  */
-- 
2.25.1