Created
October 14, 2012 21:35
-
-
Save pazdera/3889886 to your computer and use it in GitHub Desktop.
getdents + stat
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
/* 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); | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment