Mercurial > hg > toybox
changeset 807:5aa90a446d52
Add readahead.
author | Rob Landley <rob@landley.net> |
---|---|
date | Sun, 24 Feb 2013 12:51:40 -0600 |
parents | bbec26ccb40c |
children | c6eb6208c9b9 |
files | toys/other/readahead.c |
diffstat | 1 files changed, 37 insertions(+), 0 deletions(-) [+] |
line wrap: on
line diff
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/toys/other/readahead.c Sun Feb 24 12:51:40 2013 -0600 @@ -0,0 +1,37 @@ +/* readahead.c - preload files into disk cache. + * + * Copyright 2013 Rob Landley <rob@landley.net> + * + * No standard. + +USE_READAHEAD(NEWTOY(readahead, NULL, TOYFLAG_BIN)) + +config READAHEAD + bool "readahead" + default y + help + usage: readahead FILE... + + Preload files into disk cache. +*/ + +#include "toys.h" + +#include <sys/syscall.h> + +static void do_readahead(int fd, char *name) +{ + int rc; + + // Since including fcntl.h doesn't give us the wrapper, use the syscall. + // 32 bits takes LO/HI offset (we don't care about endianness of 0). + if (sizeof(long) == 4) rc = syscall(__NR_readahead, fd, 0, 0, INT_MAX); + else rc = syscall(__NR_readahead, fd, 0, INT_MAX); + + if (rc) perror_msg("readahead: %s", name); +} + +void readahead_main(void) +{ + loopfiles(toys.optargs, do_readahead); +}