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@pazdera
Created October 14, 2012 21:35
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getdents + stat
/* getdents() + stat() scenario
*
* This program is based on an example from linux man page getdents(2)
*/
#define _GNU_SOURCE
#include <dirent.h> /* Defines DT_* constants */
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#define handle_error(msg) \
do { perror(msg); exit(EXIT_FAILURE); } while (0)
struct linux_dirent {
long d_ino;
off_t d_off;
unsigned short d_reclen;
char d_name[];
};
#define BUF_SIZE 1024
int main(int argc, char *argv[])
{
int fd, nread;
char buf[BUF_SIZE];
struct linux_dirent *d;
int bpos;
char d_type;
struct stat file_info;
int status = 0;
int nfiles = 0;
fd = open(argc > 1 ? argv[1] : ".", O_RDONLY | O_DIRECTORY);
if (fd == -1)
handle_error("open");
for ( ; ; ) {
nread = syscall(SYS_getdents, fd, buf, BUF_SIZE);
if (nread == -1)
handle_error("getdents");
if (nread == 0)
break;
for (bpos = 0; bpos < nread;) {
d = (struct linux_dirent *) (buf + bpos);
status = stat(argv[1], &file_info);
if (status != 0)
handle_error("stat");
nfiles++;
bpos += d->d_reclen;
}
}
/*printf("Processed %d files in '%s'\n", nfiles, argv[1]);*/
exit(EXIT_SUCCESS);
}
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