LinuxProgramming

Demonstration of the Linux programming interface

I/O - io

file-holes.c

• Program like cp that copies a regular file that contains holes (sequence of null bytes) and also creates corresponding holes in the target file (without lseek() SEEK_DATA / SEEK_HOLE operations and truncate() / ftruncate() functions)

atomic-append.c

• Demonstration of pread() and writev() performing gather output in program that atomically appends multiple files to a single file

Access - access

authentication.c

• Demonstration of user authentication against the shadow password file using getpwnam(), getspnam(), getpass() and crypt(), compile program with the -lcrypt option (so it is linked against the crypt library)

Time - time

time_and_timezone.c

• Program displaying calendar time in seconds and microseconds since Epoch, local time or current time in time zone specified in argument (example: ":Pacific/Auckland"), demonstration of gettimeofday(), time(), localtime(), asctime() and setenv() functions

System - system

information-and-limits.c

• Program displaying system information and limits

File - file

file-attributes.c

• Program demonstrating system calls chmod() for changing file permissions and ioctl() with FS_IOC_SETFLAGS flag (equivalent to chattr command) for changing file i-node flags

Directory - directory

directory-management.c

• Program demonstrating mkdir() and rmdir() commands and directory iteration

Monitoring - monitoring

monitoring.c

• Program that recursively monitors and logs all file/directory events using tree walking function nftw() and inotify API

Signal - signal

signal.c

• Program that fetches and sends pending standard/realtime signals using sigprocmask(), sigwaitinfo(), sigqueue() and kill()

Timer - timer

timerfd.c

• Program demonstrating timer using file descriptor with Linux-specific timerfd facility

Process - process

synchronized-process.c

• Program demonstrating process synchronization using signals to avoid race conditions with fork(), sigprocmask(), sigaction() and sigsuspend()

child-monitoring.c

• Program monitoring terminated child processes (zombies) using waitpid()

Thread - thread

mutex.c

• Program demonstrating thread creation, join and mutex usage to avoid race conditions between threads using pthread_create, pthread_join, pthread_mutex_lock() and pthread_mutex_unlock()

cond_variable.c

• Program demonstrating condition variables and signaling changes of states between threads using pthread_cond_signal() and pthread_cond_wait()

cancellation.c

• Program cancelling thread and calling cleanup handler using pthread_cancel(), pthread_cleanup_push() and pthread_cleanup_pop()