From: Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>
Date: Tue, 15 Mar 2016 23:26:30 +0000 (-0400)
Subject: basic/missing: add copy_file_range
X-Git-Tag: v231.3~215
X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=commitdiff_plain;h=a538528904a7daf5418e38bbafce68a894fe2922

basic/missing: add copy_file_range

syscall numbers based on:
https://fedora.juszkiewicz.com.pl/syscalls.html
---

diff --git a/src/basic/missing.h b/src/basic/missing.h
index 1be35eb94..bf685ffe6 100644
--- a/src/basic/missing.h
+++ b/src/basic/missing.h
@@ -1190,3 +1190,33 @@ static inline key_serial_t request_key(const char *type, const char *description
 #endif
 
 #endif
+
+#ifndef __NR_copy_file_range
+#  if defined(__x86_64__)
+#    define __NR_copy_file_range 326
+#  elif defined(__i386__)
+#    define __NR_copy_file_range 377
+#  elif defined __s390__
+#    define __NR_copy_file_range 375
+#  elif defined __arm__
+#    define __NR_copy_file_range 391
+#  elif defined __aarch64__
+#    define __NR_copy_file_range 285
+#  else
+#    warning "__NR_copy_file_range not defined for your architecture"
+#  endif
+#endif
+
+#if !HAVE_DECL_COPY_FILE_RANGE
+static inline ssize_t copy_file_range(int fd_in, loff_t *off_in,
+                                      int fd_out, loff_t *off_out,
+                                      size_t len,
+                                      unsigned int flags) {
+#ifdef __NR_copy_file_range
+        return syscall(__NR_copy_file_range, fd_in, off_in, fd_out, off_out, len, flags);
+#else
+        errno = ENOSYS;
+        return -1;
+#endif
+}
+#endif