missing.h: add AF_VSOCK bits

Ubuntu 14.04 (Trusty) kernel header packages ship without
<linux/vm_sockets.h>.  Only struct sockaddr_vm and VMADDR_CID_ANY will
be needed by elogind and they are simple enough to go in missing.h.

CentOS 7 <sys/socket.h> does not define AF_VSOCK.  Define it so the code
can compile although actual socket(2) calls may fail at runtime if the
address family isn't available.

diff --git a/src/basic/missing.h b/src/basic/missing.h
index 50c9e7cd8870f0d6f6b0aa94b2f859fdffef7df6..beadd70ac1da9d32bddeb3a3395493d4aa9ccacd 100644 (file)
--- a/src/basic/missing.h
+++ b/src/basic/missing.h
@@ -34,6 +34,7 @@
 #include <net/ethernet.h>
 #include <stdlib.h>
 #include <sys/resource.h>
+#include <sys/socket.h>
 #include <sys/syscall.h>
 #include <uchar.h>
 #include <unistd.h>
@@ -53,6 +54,23 @@
 #include <linux/btrfs.h>
 #endif
 
+#ifdef HAVE_LINUX_VM_SOCKETS_H
+#include <linux/vm_sockets.h>
+#else
+#define VMADDR_CID_ANY -1U
+struct sockaddr_vm {
+        unsigned short svm_family;
+        unsigned short svm_reserved1;
+        unsigned int svm_port;
+        unsigned int svm_cid;
+        unsigned char svm_zero[sizeof(struct sockaddr) -
+                               sizeof(unsigned short) -
+                               sizeof(unsigned short) -
+                               sizeof(unsigned int) -
+                               sizeof(unsigned int)];
+};
+#endif /* !HAVE_LINUX_VM_SOCKETS_H */
+
 #include "macro.h"
 
 #ifndef RLIMIT_RTTIME
@@ -1172,4 +1190,8 @@ struct ethtool_link_settings {
 #define SOL_ALG 279
 #endif
 
+#ifndef AF_VSOCK
+#define AF_VSOCK 40
+#endif
+
 #include "missing_syscall.h"