From 9bd9d7dad54063cb1a648d92615d2f36169a4eb5 Mon Sep 17 00:00:00 2001
From: Rob Landley <rob@landley.net>
Date: Fri, 26 Jun 2026 23:23:38 -0500
Subject: [PATCH] Switch to posix_fadvise(POSIX_FADV_WILLNEED)

---
 toys/other/readahead.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/toys/other/readahead.c b/toys/other/readahead.c
index 4d52e44b..3501540b 100644
--- a/toys/other/readahead.c
+++ b/toys/other/readahead.c
@@ -15,15 +15,11 @@ config READAHEAD
     Preload files into disk cache.
 */
 
-#define _LARGEFILE64_SOURCE  // musl's _ALL_SOURCE lies, no off64_t
 #include "toys.h"
 
-// glibc won't provide this prototype unless we claim Linux belongs to the FSF
-ssize_t readahead(int fd, off64_t offset, size_t count);
-
 static void do_readahead(int fd, char *name)
 {
-  if (readahead(fd, 0, INT_MAX)) perror_msg("readahead: %s", name);
+  if (posix_fadvise(fd, 0, 0, POSIX_FADV_WILLNEED)) perror_msg_raw(name);
 }
 
 void readahead_main(void)
-- 
2.39.5