[klibc] [PATCH klibc 1/2] rename, renameat: Use renameat2() system call

[Ben Hutchings]

New architectures only define the renameat2() system call, which was
added in Linux 3.15.  Define rename() and renameat() as wrappers for
it if necessary.

Signed-off-by: Ben Hutchings <ben at decadent.org.uk>
---
--- a/usr/klibc/Kbuild
+++ b/usr/klibc/Kbuild
@@ -59,7 +59,8 @@ klib-y += vsnprintf.o snprintf.o vsprint
 	  inet/inet_ntoa.o inet/inet_aton.o inet/inet_addr.o \
 	  inet/inet_ntop.o inet/inet_pton.o inet/bindresvport.o \
 	  accept.o send.o recv.o \
-	  access.o chmod.o chown.o dup2.o mknod.o poll.o rename.o stat.o \
+	  access.o chmod.o chown.o dup2.o mknod.o poll.o rename.o renameat.o \
+	  stat.o \
 	  lchown.o link.o rmdir.o unlink.o utimes.o lstat.o mkdir.o \
 	  readlink.o select.o symlink.o pipe.o \
 	  ctype/isalnum.o ctype/isalpha.o ctype/isascii.o \
--- a/usr/klibc/rename.c
+++ b/usr/klibc/rename.c
@@ -5,7 +5,7 @@
 
 int rename(const char *oldpath, const char *newpath)
 {
-	return renameat(AT_FDCWD, oldpath, AT_FDCWD, newpath);
+	return renameat2(AT_FDCWD, oldpath, AT_FDCWD, newpath, 0);
 }
 
 #endif /* __NR_rename */
--- /dev/null
+++ b/usr/klibc/renameat.c
@@ -0,0 +1,12 @@
+#include <fcntl.h>
+#include <stdio.h>
+
+#ifndef __NR_renameat
+
+int renameat(int olddirfd, const char *oldpath,
+	     int newdirfd, const char *newpath)
+{
+	return renameat2(olddirfd, oldpath, newdirfd, newpath, 0);
+}
+
+#endif /* __NR_renameat */
--- a/usr/klibc/SYSCALLS.def
+++ b/usr/klibc/SYSCALLS.def
@@ -116,6 +116,7 @@ int chdir(const char *);
 int fchdir(int);
 <?> int rename(const char *, const char *);
 <?> int renameat(int, const char *, int, const char *);
+<?> int renameat2(int, const char *, int, const char *, unsigned int);
 <?> int mknod(const char *, mode_t, dev_t);
 <?> int mknodat(int, const char *, mode_t, dev_t);
 <?> int chmod(const char *, mode_t);
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