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#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <sysexits.h>
static const char *program = "readahead";
void usage(void) {
printf("usage: %s [-hv] FILE [...]\n", program);
exit(EX_USAGE);
}
int main( int argc, char *argv[]) {
int c, verbose=0;
/* parse options */
while ( (c = getopt(argc, argv, "hv")) >= 0 ) {
switch (c) {
case 'v': verbose++;
break;
case 'h':
default: usage();
break;
}
}
/* check that at least one file is specified */
if (optind == argc)
usage();
/* parse files */
c = EX_OK;
while (optind < argc) {
struct stat st;
FILE *f = fopen(argv[optind], "r");
/* check that file exists */
if (f == NULL) {
perror(argv[optind]);
c = EX_NOINPUT;
} else {
stat(argv[optind], &st);
readahead( fileno(f), 0, (size_t)st.st_size );
if (verbose)
printf("%s\n", argv[optind]);
fclose(f);
}
optind++;
}
return (c);
}
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