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#define _GNU_SOURCE
#include <dirent.h> /* Defines DT_* constants */
#include <fcntl.h>
#include <stdio.h>
#include <string.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_dirent64 {
ino64_t d_ino; /* 64-bit inode number */
off64_t d_off; /* 64-bit offset to next structure */
unsigned short d_reclen; /* Size of this dirent */
unsigned char d_type; /* File type */
char d_name[]; /* Filename (null-terminated) */
};
#define BUF_SIZE 1024000
void flagsort(char *s) {
int i, j;
if (!s[0])
return;
// adapted insertion sort from http://stackoverflow.com/a/2789530
for (i = 1; s[i]; i++) {
char t = s[i];
for (j = i; j >= 1 && t < s[j-1]; j--)
s[j] = s[j-1];
s[j] = t;
}
}
int
main(int argc, char *argv[])
{
int fd, nread;
char buf[BUF_SIZE];
struct linux_dirent64 *d;
int bpos;
char d_type;
fd = open(argc > 1 ? argv[1] : ".", O_RDONLY | O_DIRECTORY);
if (fd == -1)
handle_error("open");
while (1) {
nread = syscall(SYS_getdents64, fd, buf, BUF_SIZE);
if (nread == -1)
handle_error("getdents64");
if (nread == 0)
break;
printf("--------------- nread=%d ---------------\n", nread);
printf("inode# file type d_reclen d_off d_name\n");
for (bpos = 0; bpos < nread;) {
d = (struct linux_dirent64 *) (buf + bpos);
if (d->d_type != DT_REG)
goto next;
if (d->d_name[0] == '.')
goto next;
char *flags = strstr(d->d_name, ":2,");
if (!flags)
goto next;
// if (strncmp(d->d_name, "1467836925_0.1439.juno,U=87588,FMD5=7e33429f656f1", strlen("1467836925_0.1439.juno,U=87588,FMD5=7e33429f656f1")-1))
// goto next;
// printf("%s\n", d->d_name);
flagsort(flags+3);
printf("%s\n", d->d_name);
// if (!strchr(flags, 'S'))
// printf("%s\n", d->d_name);
// goto next;
/*
printf("%-10s ", (d_type == DT_REG) ? "regular" :
(d_type == DT_DIR) ? "directory" :
(d_type == DT_FIFO) ? "FIFO" :
(d_type == DT_SOCK) ? "socket" :
(d_type == DT_LNK) ? "symlink" :
(d_type == DT_BLK) ? "block dev" :
(d_type == DT_CHR) ? "char dev" : "???");
printf("%4d %10lld %s\n", d->d_reclen,
(long long) d->d_off, d->d_name);
*/
next:
bpos += d->d_reclen;
}
}
exit(EXIT_SUCCESS);
}
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