Try running the program in Listing 23-3 (t_nanosleep.c) in the background with a 60-second sleep interval, while using the following command to send as many SIGINT signals as possible to the background process:

You should observe that the program sleeps rather longer than expected. Replace the use of nanosleep() with the use of clock_gettime() (use a CLOCK_REALTIME clock) and clock_nanosleep() with the TIMER_ABSTIME flag. (This exercise requires Linux 2.6.) Repeat the test with the modified program and explain the difference.

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$ while true; do kill -INT pid; done $ while true; do kill -INT pid; done