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d_off.c
jack_gandi.net
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jack_gandi.net
Nov 9 2018, 10:07 AM
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d_off.c
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#include <dirent.h> // struct dirent, DT_*
/* #include "/usr/src/sys/sys/dirent.h" // struct dirent, DT_* */
#include <fcntl.h> // O_*
#include <stdio.h> // printf
#include <stdlib.h> // EXIT_*
#include <sys/stat.h> // uint*_t
#define handle_error(msg) \
do { perror(msg); exit(EXIT_FAILURE); } while (0)
#define BUF_SIZE sizeof(struct dirent)
#define BUF_SIZE 72
int main(int argc, char *argv[])
{
int fd, nread;
char buf[BUF_SIZE];
struct dirent *d;
int bpos;
char d_type;
off_t offset, start, before, after;
fd = open(argc > 1 ? argv[1] : ".", O_RDONLY | O_DIRECTORY);
if (fd == -1)
handle_error("open");
/*
* replace start with an offset to check for correctness
*/
start = 0x0;
lseek(fd, start, SEEK_SET);
printf("BUF_SIZE=%lu\n", BUF_SIZE);
printf(" inode# file type d_reclen d_namlen d_off lbefore lafter d_name\n");
for ( ; ; ) {
before = lseek(fd, 0x0, SEEK_CUR);
nread = getdirentries(fd, buf, BUF_SIZE, &offset);
after = lseek(fd, 0x0, SEEK_CUR);
printf("---------read=%d---- %#lx->%#lx\n", nread, before, after);
if (nread == -1)
handle_error("getdents");
if (nread == 0)
break;
for (bpos = 0; bpos < nread;) {
d = (struct dirent *) (buf + bpos);
int ok = after == d->d_off;
printf("%-6s ", ok ? "OK" : "BROKEN");
printf("%10lu", d->d_ino);
//d_type = *(buf + bpos + d->d_reclen - 1);
d_type = d->d_type;
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", d->d_reclen);
printf(" %4d", d->d_namlen);
printf(" %#10llx", (long long) d->d_off);
printf(" %#10llx", (long long) before);
printf(" %#10llx", (long long) after);
printf(" %s\n", d->d_name);
bpos += d->d_reclen;
}
}
exit(EXIT_SUCCESS);
}

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