47 lines
958 B
C
47 lines
958 B
C
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/*
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* This program waits until a SIGINT signal
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* is received.
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*/
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#include <stdio.h>
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#include <signal.h>
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sig_atomic_t signal_count;
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sig_atomic_t signal_number;
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static void alarm_handler( int signum )
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{
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++signal_count;
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signal_number = signum;
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}
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void main()
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{
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unsigned long i;
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signal_count = 0;
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signal_number = 0;
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signal( SIGINT, alarm_handler );
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printf("Signal will be auto-raised on iteration "
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"10000 or hit CTRL-C.\n");
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printf("Iteration: ");
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for( i = 0; i < 100000; ++i )
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{
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printf("\b\b\b\b\b%*d", 5, i);
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if( i == 10000 ) raise(SIGINT);
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if( signal_count > 0 ) break;
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}
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if( i == 100000 ) {
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printf("\nNo signal was raised.\n");
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} else if( i == 10000 ) {
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printf("\nSignal %d was raised by the "
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"raise() function.\n", signal_number);
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} else {
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printf("\nUser raised the signal.\n",
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signal_number);
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}
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}
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