utils-std

commit: 248736cbce831e8064973bbd08f3cec4a591d654
parent 20dc0e9ae15d0a2c8a216803bcdecca343f34423
Author: Haelwenn (lanodan) Monnier <contact@hacktivis.me>
Date:   Tue, 10 Jun 2025 20:17:29 +0200

cmd/cmp: Use posix_fadvise(3) prior to comparing the contents

Diffstat:
M
cmd/cmp.c
4
+++-

1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/cmd/cmp.c b/cmd/cmp.c
@@ -7,7 +7,7 @@
 
 #include <assert.h>
 #include <errno.h>
-#include <fcntl.h> // open
+#include <fcntl.h> // open, posix_fadvise
 #include <stdbool.h>
 #include <stdio.h>    // fopen, fprintf, getline
 #include <stdlib.h>   // abort, strtoul
@@ -234,6 +234,7 @@ main(int argc, char *argv[])
 			return 1;
 		}
 
+		posix_fadvise(fd1, 0, 0, POSIX_FADV_SEQUENTIAL);
 	}
 
 	if(fd2 != STDIN_FILENO)
@@ -250,6 +251,7 @@ main(int argc, char *argv[])
 			return 1;
 		}
 
+		posix_fadvise(fd2, 0, 0, POSIX_FADV_SEQUENTIAL);
 	}
 
 	int ret = do_cmp(file1, argv[0], file2, argv[1]);