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-rw-r--r--io/sys/sendfile.h7
1 files changed, 5 insertions, 2 deletions
diff --git a/io/sys/sendfile.h b/io/sys/sendfile.h
index 0627c40..797822b 100644
--- a/io/sys/sendfile.h
+++ b/io/sys/sendfile.h
@@ -25,8 +25,11 @@
__BEGIN_DECLS
-/* Send COUNT bytes from file associated with IN_FD starting at OFFSET to
- descriptor OUT_FD. */
+/* Send up to COUNT bytes from file associated with IN_FD starting at
+ *OFFSET to descriptor OUT_FD. Set *OFFSET to the IN_FD's file position
+ following the read bytes. If OFFSET is a null pointer, use the normal
+ file position instead. Return the number of written bytes, or -1 in
+ case of error. */
#ifndef __USE_FILE_OFFSET64
extern ssize_t sendfile (int __out_fd, int __in_fd, off_t *__offset,
size_t __count) __THROW;