librdmacm: compile fcntl64/sendfile64

Wrap fcntl64 and sendfile64 in #if _FILE_OFFSET_BITS != 64 so the
preload builds with and without LFS.
Use pragmas to avoid -Wmissing-prototypes and -Wredundant-decls
on the wrappers.

Signed-off-by: Batsheva Black <bblack@nvidia.com>

Author: BatshevaBlack

librdmacm/preload.c

@@ -88,11 +88,15 @@ struct socket_calls {
 	int (*getsockopt)(int socket, int level, int optname,
 			  void *optval, socklen_t *optlen);
 	int (*fcntl)(int socket, int cmd, ... /* arg */);
+#if _FILE_OFFSET_BITS != 64
 	int (*fcntl64)(int socket, int cmd, ... /* arg */);
+#endif
 	int (*dup)(int oldfd);
 	int (*dup2)(int oldfd, int newfd);
 	ssize_t (*sendfile)(int out_fd, int in_fd, off_t *offset, size_t count);
+#if _FILE_OFFSET_BITS != 64
 	ssize_t (*sendfile64)(int out_fd, int in_fd, off64_t *offset64, size_t count);
+#endif
 	int (*fxstat)(int ver, int fd, struct stat *buf);
 	int (*epoll_create)(int size);
 	int (*epoll_create1)(int flags);
@@ -421,11 +425,15 @@ static void init_preload(void)
 	real.setsockopt = dlsym(RTLD_NEXT, "setsockopt");
 	real.getsockopt = dlsym(RTLD_NEXT, "getsockopt");
 	real.fcntl = dlsym(RTLD_NEXT, "fcntl");
+#if _FILE_OFFSET_BITS != 64
 	real.fcntl64 = dlsym(RTLD_NEXT, "fcntl64");
+#endif
 	real.dup = dlsym(RTLD_NEXT, "dup");
 	real.dup2 = dlsym(RTLD_NEXT, "dup2");
 	real.sendfile = dlsym(RTLD_NEXT, "sendfile");
+#if _FILE_OFFSET_BITS != 64
 	real.sendfile64 = dlsym(RTLD_NEXT, "sendfile64");
+#endif
 	real.fxstat = dlsym(RTLD_NEXT, "__fxstat");
 	real.epoll_create = dlsym(RTLD_NEXT, "epoll_create");
 	real.epoll_create1 = dlsym(RTLD_NEXT, "epoll_create1");
@@ -1179,6 +1187,10 @@ int fcntl(int socket, int cmd, ... /* arg */)
 	return ret;
 }
 
+#if _FILE_OFFSET_BITS != 64
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmissing-prototypes"
+#pragma GCC diagnostic ignored "-Wredundant-decls"
 int fcntl64(int socket, int cmd, ... /* arg */)
 {
 	va_list args;
@@ -1218,6 +1230,8 @@ int fcntl64(int socket, int cmd, ... /* arg */)
 	va_end(args);
 	return ret;
 }
+#pragma GCC diagnostic pop
+#endif
 
 int dup(int oldfd)
 {
@@ -1298,6 +1312,10 @@ ssize_t sendfile(int out_fd, int in_fd, off_t *offset, size_t count)
 	return ret;
 }
 
+#if _FILE_OFFSET_BITS != 64
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wmissing-prototypes"
+#pragma GCC diagnostic ignored "-Wredundant-decls"
 ssize_t sendfile64(int out_fd, int in_fd, off64_t *offset64, size_t count)
 {
 	void *file_addr;
@@ -1317,6 +1335,8 @@ ssize_t sendfile64(int out_fd, int in_fd, off64_t *offset64, size_t count)
 	munmap(file_addr, count);
 	return ret;
 }
+#pragma GCC diagnostic pop
+#endif
 
 int __fxstat(int ver, int socket, struct stat *buf)
 {