I want to loop through all the sub-directories and get all the files in the directory and sub-directories. I only want to use the open() and read() system call to do so(not opendir() or is_dir) bit I keep on getting an error
error: ‘O_DIRECTORY’ undeclared (first use in this function)
although I did imported the fcntl.
here is my code down below:
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include<fcntl.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
extern int errno;
int main()
{
int fd;
if ((fd = open(".", O_DIRECTORY | O_RDONLY)) ==-1)
{
printf("error %s\n", strerror(errno));
return -1;
}
return 0;
}
In addition how can use the read() system call to check if I'm reading a file or a sub-directory? (as I mentioned I want to go also over the files in all the sub-directories) I know is_dir does that but I'm looking for a way to do it without using it. Any help would be appreciated.
Quoting the holy scripture :
The
O_CLOEXEC
,O_DIRECTORY
, andO_NOFOLLOW
flags are not specified in POSIX.1-2001, but are specified in POSIX.1-2008. Since glibc 2.12, one can obtain their definitions by defining either_POSIX_C_SOURCE
with a value greater than or equal to200809L
or_XOPEN_SOURCE
with a value greater than or equal to700
. In glibc 2.11 and earlier, one obtains the definitions by defining_GNU_SOURCE
.
Try compiling with -D_POSIX_C_SOURCE=200809L
or add a #define _POSIX_C_SOURCE 200809L
before including any headers.
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