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Advanced UNIX programming

Advanced UNIX programming. Fall 2002 Instructor: Ashok Srinivasan Lecture 12. Acknowledgements: The syllabus and power point presentations are modified versions of those by T. Baker and X. Yuan. Announcements. Reading assignment Work on HW 2 Prepare for midterm

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Advanced UNIX programming

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  1. Advanced UNIX programming Fall 2002 Instructor: Ashok Srinivasan Lecture 12 Acknowledgements: The syllabus and power point presentations are modified versions of those by T. Baker and X. Yuan

  2. Announcements • Reading assignment • Work on HW 2 • Prepare for midterm • Midterm1: Monday, 30 Sep 2002

  3. Week 5 Topics • Signals • sigaction • kill • Midterm review • Some system calls • HW 2 hints

  4. Signals • sigaction • kill

  5. sigaction • Supersedes the signal function • #include <signal.h> • int sigaction(int signo, const struct sigaction * act, struct sigaction *oact) • struct sigaction { void (*sa_handler)(); /* signal handler */ sigset_t sa_mask; /*additional signal to block */ int sa_flags; /* options: we will set it to 0 */ sa_sigaction; /* we will not use it */ }; • See example4.c

  6. kill • Send a signal to a process • #include <signal.h> • #include <sys/types.h> • int kill(pid_t pid, int signo); • See example5.c • See example6.c for the use of alarm

  7. Impact of signals on system calls • A system call may return prematurely • See example7.c • How can we deal with this problem? • Check the return value of the system call and act accordingly

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