📄 sleep1.c
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#include <signal.h>#include <unistd.h>static voidsig_alrm(int signo){ /* nothing to do, just return to wake up the pause */}unsigned intsleep1(unsigned int nsecs){ if (signal(SIGALRM, sig_alrm) == SIG_ERR) return(nsecs); alarm(nsecs); /* start the timer */ pause(); /* next caught signal wakes us up */ return(alarm(0)); /* turn off timer, return unslept time */}
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