(f)open

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

int main(int argc, char *argv[])
{
    char buf[256];
    int fd;
    FILE *file;

    puts("open()");
    fd = open(argv[1], O_RDONLY);
    if(fd < 0) {
        perror("open");
        return 1;
    }
    while(read(fd, buf, 1) > 0)
        putchar(buf[0]);
    close(fd);

    puts("\nfopen()");
    file = fopen(argv[1], "r");
    while(fread(buf, 1, 1, file))
        putchar(buf[0]);
    fclose(file);
    return 0;
}