¿Qué hace getdents()?

What does getdents() do?

The system call getdents() reads several dirent structures from the directory pointed at by fd into the memory area pointed to by dirp. The parameter count is the size of the memory area. d_ino is an inode number.

getdents() The system call getdents() reads several linux_dirent structures from the directory referred to by the open file descriptor fd into the buffer pointed to by dirp. The argument count specifies the size of that buffer.

UNIX & GNU/Linux System calls readdir() The readdir() system call function is used to read into a directory. The function returns a pointer to a dirent structure. This structure contains five fields but only two are POSIX standard, this is the d_name and the d_ino member.

The readdir() function returns a pointer to a dirent structure representing the next directory entry in the directory stream pointed to by dirp. It returns NULL on reaching the end of the directory stream or if an error occurred.

mkdir() Unix, Linux System Call.

To perform a trace route in Linux open Terminal and type in “traceroute domain.com” replacing domain.com with your domain name or IP address. If you do not have trace route installed you may need to install it. For example in Ubuntu the command to install trace route is “sudo apt-get install traceroute”.

Everything, all the files and directories, in Linux are located under ‘root’ represented by ‘/’. If you look at the directory structure, you’ll realize that it is similar to a plant’s root. Linux Directory Structure. Since all other directories or files are descended from root, the absolute path of any file is traversed through root.

There is /root directory as well and it works as the home directory of the root user. So instead of /home/root, the home of root is located at /root. Do not confuse it with the root directory (/). When you connect a removable media such as USB disk, SD card or DVD, a directory is automatically created under the /media directory for them.

For example, if you want to check the login history in your Linux system, just check the content of the file in /var/log/wtmp. The ‘/boot’ directory contains the files of the kernel and boot image, in addition to LILO and Grub.

Traditionally, the /opt directory is used for installing/storing the files of third-party applications that are not available from the distribution’s repository. The normal practice is to keep the software code in opt and then link the binary file in the /bin directory so that all the users can run it.