utils: move memfd_create() definition

src/lxc/conf.c

@@ -68,10 +68,6 @@
 #include <../include/openpty.h>
 #endif
 
-#ifdef HAVE_LINUX_MEMFD_H
-#include <linux/memfd.h>
-#endif
-
 #include "af_unix.h"
 #include "caps.h"       /* for lxc_caps_last_cap() */
 #include "cgroup.h"
@@ -178,59 +174,6 @@ static int sethostname(const char * name, size_t len)
 #define MS_LAZYTIME (1<<25)
 #endif
 
-/* memfd_create() */
-#ifndef MFD_CLOEXEC
-#define MFD_CLOEXEC 0x0001U
-#endif
-
-#ifndef MFD_ALLOW_SEALING
-#define MFD_ALLOW_SEALING 0x0002U
-#endif
-
-#ifndef HAVE_MEMFD_CREATE
-static int memfd_create(const char *name, unsigned int flags) {
-	#ifndef __NR_memfd_create
-		#if defined __i386__
-			#define __NR_memfd_create 356
-		#elif defined __x86_64__
-			#define __NR_memfd_create 319
-		#elif defined __arm__
-			#define __NR_memfd_create 385
-		#elif defined __aarch64__
-			#define __NR_memfd_create 279
-		#elif defined __s390__
-			#define __NR_memfd_create 350
-		#elif defined __powerpc__
-			#define __NR_memfd_create 360
-		#elif defined __sparc__
-			#define __NR_memfd_create 348
-		#elif defined __blackfin__
-			#define __NR_memfd_create 390
-		#elif defined __ia64__
-			#define __NR_memfd_create 1340
-		#elif defined _MIPS_SIM
-			#if _MIPS_SIM == _MIPS_SIM_ABI32
-				#define __NR_memfd_create 4354
-			#endif
-			#if _MIPS_SIM == _MIPS_SIM_NABI32
-				#define __NR_memfd_create 6318
-			#endif
-			#if _MIPS_SIM == _MIPS_SIM_ABI64
-				#define __NR_memfd_create 5314
-			#endif
-		#endif
-	#endif
-	#ifdef __NR_memfd_create
-	return syscall(__NR_memfd_create, name, flags);
-	#else
-	errno = ENOSYS;
-	return -1;
-	#endif
-}
-#else
-extern int memfd_create(const char *name, unsigned int flags);
-#endif
-
 char *lxchook_names[NUM_LXC_HOOKS] = {"pre-start", "pre-mount", "mount",
 				      "autodev",   "start",     "stop",
 				      "post-stop", "clone",     "destroy"};

src/lxc/utils.h

@@ -39,6 +39,10 @@
 #include <sys/types.h>
 #include <sys/vfs.h>
 
+#ifdef HAVE_LINUX_MEMFD_H
+#include <linux/memfd.h>
+#endif
+
 #include "initutils.h"
 
 /* Define __S_ISTYPE if missing from the C library. */
@@ -184,6 +188,59 @@ static inline int signalfd(int fd, const sigset_t *mask, int flags)
 #define LOOP_CTL_GET_FREE 0x4C82
 #endif
 
+/* memfd_create() */
+#ifndef MFD_CLOEXEC
+#define MFD_CLOEXEC 0x0001U
+#endif
+
+#ifndef MFD_ALLOW_SEALING
+#define MFD_ALLOW_SEALING 0x0002U
+#endif
+
+#ifndef HAVE_MEMFD_CREATE
+static inline int memfd_create(const char *name, unsigned int flags) {
+	#ifndef __NR_memfd_create
+		#if defined __i386__
+			#define __NR_memfd_create 356
+		#elif defined __x86_64__
+			#define __NR_memfd_create 319
+		#elif defined __arm__
+			#define __NR_memfd_create 385
+		#elif defined __aarch64__
+			#define __NR_memfd_create 279
+		#elif defined __s390__
+			#define __NR_memfd_create 350
+		#elif defined __powerpc__
+			#define __NR_memfd_create 360
+		#elif defined __sparc__
+			#define __NR_memfd_create 348
+		#elif defined __blackfin__
+			#define __NR_memfd_create 390
+		#elif defined __ia64__
+			#define __NR_memfd_create 1340
+		#elif defined _MIPS_SIM
+			#if _MIPS_SIM == _MIPS_SIM_ABI32
+				#define __NR_memfd_create 4354
+			#endif
+			#if _MIPS_SIM == _MIPS_SIM_NABI32
+				#define __NR_memfd_create 6318
+			#endif
+			#if _MIPS_SIM == _MIPS_SIM_ABI64
+				#define __NR_memfd_create 5314
+			#endif
+		#endif
+	#endif
+	#ifdef __NR_memfd_create
+	return syscall(__NR_memfd_create, name, flags);
+	#else
+	errno = ENOSYS;
+	return -1;
+	#endif
+}
+#else
+extern int memfd_create(const char *name, unsigned int flags);
+#endif
+
 /* Struct to carry child pid from lxc_popen() to lxc_pclose().
  * Not an opaque struct to allow direct access to the underlying FILE *
  * (i.e., struct lxc_popen_FILE *file; fgets(buf, sizeof(buf), file->f))