1*cf5a6c84SAndroid Build Coastguard Worker /* readahead.c - preload files into disk cache.
2*cf5a6c84SAndroid Build Coastguard Worker *
3*cf5a6c84SAndroid Build Coastguard Worker * Copyright 2013 Rob Landley <[email protected]>
4*cf5a6c84SAndroid Build Coastguard Worker *
5*cf5a6c84SAndroid Build Coastguard Worker * No standard.
6*cf5a6c84SAndroid Build Coastguard Worker
7*cf5a6c84SAndroid Build Coastguard Worker USE_READAHEAD(NEWTOY(readahead, NULL, TOYFLAG_BIN))
8*cf5a6c84SAndroid Build Coastguard Worker
9*cf5a6c84SAndroid Build Coastguard Worker config READAHEAD
10*cf5a6c84SAndroid Build Coastguard Worker bool "readahead"
11*cf5a6c84SAndroid Build Coastguard Worker default y
12*cf5a6c84SAndroid Build Coastguard Worker help
13*cf5a6c84SAndroid Build Coastguard Worker usage: readahead FILE...
14*cf5a6c84SAndroid Build Coastguard Worker
15*cf5a6c84SAndroid Build Coastguard Worker Preload files into disk cache.
16*cf5a6c84SAndroid Build Coastguard Worker */
17*cf5a6c84SAndroid Build Coastguard Worker
18*cf5a6c84SAndroid Build Coastguard Worker #include "toys.h"
19*cf5a6c84SAndroid Build Coastguard Worker
do_readahead(int fd,char * name)20*cf5a6c84SAndroid Build Coastguard Worker static void do_readahead(int fd, char *name)
21*cf5a6c84SAndroid Build Coastguard Worker {
22*cf5a6c84SAndroid Build Coastguard Worker int rc;
23*cf5a6c84SAndroid Build Coastguard Worker
24*cf5a6c84SAndroid Build Coastguard Worker // Since including fcntl.h doesn't give us the wrapper, use the syscall.
25*cf5a6c84SAndroid Build Coastguard Worker // 32 bits takes LO/HI offset (we don't care about endianness of 0).
26*cf5a6c84SAndroid Build Coastguard Worker if (sizeof(long) == 4) rc = syscall(__NR_readahead, fd, 0, 0, INT_MAX);
27*cf5a6c84SAndroid Build Coastguard Worker else rc = syscall(__NR_readahead, fd, 0, INT_MAX);
28*cf5a6c84SAndroid Build Coastguard Worker
29*cf5a6c84SAndroid Build Coastguard Worker if (rc) perror_msg("readahead: %s", name);
30*cf5a6c84SAndroid Build Coastguard Worker }
31*cf5a6c84SAndroid Build Coastguard Worker
readahead_main(void)32*cf5a6c84SAndroid Build Coastguard Worker void readahead_main(void)
33*cf5a6c84SAndroid Build Coastguard Worker {
34*cf5a6c84SAndroid Build Coastguard Worker loopfiles(toys.optargs, do_readahead);
35*cf5a6c84SAndroid Build Coastguard Worker }
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