Does |fstatfs()| work with fd from |O_PATH| ? Yes...
Posted by Anonymous on Wed 19th Feb 2020 12:40
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modification of post by Anonymous (view diff)


/* Needed to obtain |O_PATH| */
#ifndef _GNU_SOURCE
#define _GNU_SOURCE 1
#endif

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/statfs.h>
#include <sys/types.h>
#include <sys/stat.h>


int main(int ac, char *av[])
{
        int fd;
        struct statfs statfsbuf;

        (void)memset(&statfsbuf, 0, sizeof(statfsbuf));

        fd = open("/tmp", O_RDONLY|O_PATH);
        if (fd < 0)
        {
                perror("open() failed.");
                return EXIT_FAILURE;
        }

        if (fstatfs(fd, &statfsbuf) != 0)
        {
                perror("fstatfs() failed.");
                return EXIT_FAILURE;
        }

        (void)close(fd);

        (void)printf("f_blocks=%ld\n",  (long)statfsbuf.f_blocks);
        (void)printf("f_bfree=%ld\n",   (long)statfsbuf.f_bfree);
        (void)printf("f_bavail=%ld\n",  (long)statfsbuf.f_bavail);

        return EXIT_SUCCESS;
}