Pending Signals

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The following program takes one argument: the number of seconds to count down. The program then blocks the SIGINT signal, performs the count down, and then unblocks SIGINT. Before unblocking, the program prints whether there is a pending SIGINT signal that will be delivered once the signal is unblocked.

The program demonstrates the following system and library calls:

sigemptyset

Clear a sigset_t

sigaddset

Add a signal to a sigset_t

sigismember

Test if a signal is a member of a sigset_t

sigprocmask

Examin and change blocked signals

sigpending

Examine pending signals

strsignal

Return string describing a signal

getpid

Get process identification