1 /* readahead.c - preload files into disk cache.
2 *
3 * Copyright 2013 Rob Landley <[email protected]>
4 *
5 * No standard.
6
7 USE_READAHEAD(NEWTOY(readahead, NULL, TOYFLAG_BIN))
8
9 config READAHEAD
10 bool "readahead"
11 default y
12 help
13 usage: readahead FILE...
14
15 Preload files into disk cache.
16 */
17
18 #include "toys.h"
19
do_readahead(int fd,char * name)20 static void do_readahead(int fd, char *name)
21 {
22 int rc;
23
24 // Since including fcntl.h doesn't give us the wrapper, use the syscall.
25 // 32 bits takes LO/HI offset (we don't care about endianness of 0).
26 if (sizeof(long) == 4) rc = syscall(__NR_readahead, fd, 0, 0, INT_MAX);
27 else rc = syscall(__NR_readahead, fd, 0, INT_MAX);
28
29 if (rc) perror_msg("readahead: %s", name);
30 }
31
readahead_main(void)32 void readahead_main(void)
33 {
34 loopfiles(toys.optargs, do_readahead);
35 }
36