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Week 4 Topics: Pipes and Signals, Slides of Computer Programming

University of LucknowComputer Programming

An overview of pipes and signals in unix-based systems. Topics include named and unnamed pipes, implementing pipes in a shell, catching signals, manipulating signal sets, and using various signal handlers. Students will learn how to create and use pipes for inter-process communication and how to handle signals to respond to specific events.

Typology: Slides

2012/2013

Uploaded on 04/29/2013

parmita
parmita 🇮🇳

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Week 4 Topics
•Pipes
–Named and unnamed pipes
–Implementing pipe in a shell
•Signals
–Catching signals
–signal
–Manipulate signal sets
•sigemptyset, sigfillset, sigdelset, sigaddset, sigdelset,
sigismember
–Manipulate signal mask
•sigprocmask
–sigaction
–kill
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Week 4 Topics

  • Pipes
    • Named and unnamed pipes
    • Implementing pipe in a shell
  • Signals
    • Catching signals
    • signal
    • Manipulate signal sets
      • sigemptyset, sigfillset, sigdelset, sigaddset, sigdelset, sigismember
    • Manipulate signal mask
      • sigprocmask
    • sigaction
    • kill

Pipes

• Named pipe ( not our emphasis )

• Unnamed pipe

• Implementing pipe in a shell

Something for you to try

  • Implement a pipe
    • a.out cmd1 cmd2cmd1 | cmd

Signals

  • Catching signals
  • signal
  • Manipulate signal sets
    • sigemptyset, sigfillset, sigdelset, sigaddset, sigdelset, sigismember
  • Manipulate signal mask
    • sigprocmask
  • sigaction
  • kill

Catching a signal

  • Software interrupts
    • When a process receives a signal, it
      • Stops execution
      • Calls a signal handler routine
      • Continues
    • A signal can be received at any point in the

program

  • Default signal handler often exits the program

ANSI signal()

  • Syntax:

#include <signal.h> void (signal(int sig, void (disp)(int)))(int);

  • Semantics
    • sig -- signal (defined in signal.h)
    • disp -- SIG_IGN, SIG_DFL or the address of a signal handler
    • Handler may be erased after one invocation
      • Simple techniques for avoiding this can lead to incorrect results
    • See example3.c