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c4d29e0 Aug 20, 2012
63 lines (52 sloc) 1.37 KB
/*
* List directories using getdents() because ls, find and Python libraries
* use readdir() which is slower (but uses getdents() underneath.
*
* Compile with
* ]$ gcc getdents.c -o getdents
*/
#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*1024*5
int
main(int argc, char *argv[])
{
int fd, nread;
char buf[BUF_SIZE];
struct linux_dirent *d;
int bpos;
char d_type;
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);
d_type = *(buf + bpos + d->d_reclen - 1);
if( d->d_ino != 0 && d_type == DT_REG ) {
printf("%s\n", (char *)d->d_name );
}
bpos += d->d_reclen;
}
}
exit(EXIT_SUCCESS);
}
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