Today

1

• Todays topic
• Discuss Project No. 2.
• Summarize UNIX system calls we covered so far.

2

• File operations
• open, close, read write, unlink, dup, dup2.
• open with O_CREAT and O_EXCL.
• How to redirect the standard input/output/error?
• why is open/close necessary?

3

• process environment
• Command line arguments argc, argv
• environ and getenv()
• getpid(), getuid(), getpwuid(), getppid
• How does a program access the second (command
  line) argument?
• How does a process access the variable you set in
  shell using commands such as setenv TERM vt100?
• How does a process know its parents process id?
  How does a parent know its childrens process ids?

4

• Process management
• fork, exit, wait, waitpid, execv
• How can a parent process know whether its child
  has executed successfully?
• How to determine whether execv runs a command
  successfully?
• Inter-process communication
• pipe,
• How to implement ps grep xyuan more
• Signal
• Kill, signal, sigaction, sigfillset, sigemptyset,
  sigaddset, sigdelset, sigismember, sigprocmask,
  alarm

5

• Inter-process communication
• pipe,
• How to implement ps grep xyuan more
• Signal
• Kill, signal, sigaction, sigfillset, sigemptyset,
  sigaddset, sigdelset, sigismember, sigprocmask,
  alarm
• How to send signal to a process?
• How to catch a signal?
• How to block a signal?

6

• Terminal I/O
• canonical mode
• noncanonical mode
• tcgetattr, tcsetattr
• termios data structure
• Misc.
• system, ctime, time,