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38 lines
792 B
38 lines
792 B
4 months ago
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/* readahead.c - preload files into disk cache.
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*
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* Copyright 2013 Rob Landley <rob@landley.net>
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*
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* No standard.
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USE_READAHEAD(NEWTOY(readahead, NULL, TOYFLAG_BIN))
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config READAHEAD
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bool "readahead"
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default y
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help
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usage: readahead FILE...
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Preload files into disk cache.
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*/
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#include "toys.h"
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#include <sys/syscall.h>
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static void do_readahead(int fd, char *name)
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{
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int rc;
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// Since including fcntl.h doesn't give us the wrapper, use the syscall.
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// 32 bits takes LO/HI offset (we don't care about endianness of 0).
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if (sizeof(long) == 4) rc = syscall(__NR_readahead, fd, 0, 0, INT_MAX);
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else rc = syscall(__NR_readahead, fd, 0, INT_MAX);
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if (rc) perror_msg("readahead: %s", name);
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}
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void readahead_main(void)
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{
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loopfiles(toys.optargs, do_readahead);
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}
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