Get filesystem usage in C

statfs

#include <sys/vfs.h>
#include <stdio.h>
#include <stdlib.h>

int main (int argc, char **argv) {
	if (argc < 2) exit(EXIT_FAILURE);
	struct statfs info;
	if (statfs(argv[1], &info) == 0) {
		printf("%s - block size: %ld,"
		" total data blocks: %ld,"
		" free blocks for root: %ld,"
		" free blocks for user: %ld\n ",
		argv[1], info.f_bsize, info.f_blocks, info.f_bfree, info.f_bavail);
		exit(EXIT_SUCCESS);
	} else {
		perror("statfs()");
		exit(EXIT_FAILURE);
	}
}

// gcc -Wall -Wextra -O2 -o statfs statfs.c