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73 lines
2.6 KiB
C
73 lines
2.6 KiB
C
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#if 0
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/*─────────────────────────────────────────────────────────────────╗
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│ To the extent possible under law, Justine Tunney has waived │
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│ all copyright and related or neighboring rights to this file, │
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│ as it is written in the following disclaimers: │
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│ • http://unlicense.org/ │
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│ • http://creativecommons.org/publicdomain/zero/1.0/ │
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╚─────────────────────────────────────────────────────────────────*/
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#endif
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#include "libc/calls/calls.h"
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#include "libc/calls/struct/itimerval.h"
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#include "libc/calls/struct/sigaction.h"
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#include "libc/calls/struct/siginfo.h"
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#include "libc/calls/ucontext.h"
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#include "libc/log/check.h"
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#include "libc/stdio/stdio.h"
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#include "libc/sysv/consts/itimer.h"
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#include "libc/sysv/consts/sa.h"
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#include "libc/sysv/consts/sig.h"
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#include "libc/time/time.h"
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volatile bool gotalrm;
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void OnSigAlrm(int sig, siginfo_t *si, ucontext_t *ctx) {
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gotalrm = true;
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}
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int main() {
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//////////////////////////////////////////////////////////////////////////////
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printf("first tutorial: set singleshot alarm for 1.5 seconds from now\n");
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// setup alarm in 1.5 seconds
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// this timer tears itself down once it's handled
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struct itimerval shot = {{0, 0}, {1, 500000}};
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struct sigaction handler = {.sa_sigaction = OnSigAlrm,
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.sa_flags = SA_RESETHAND | SA_SIGINFO};
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CHECK_EQ(0, sigaction(SIGALRM, &handler, 0));
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CHECK_EQ(0, setitimer(ITIMER_REAL, &shot, 0));
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// wait for alarm
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pause();
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printf("got singleshot alarm!\n\n");
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//////////////////////////////////////////////////////////////////////////////
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printf("second tutorial: interval timer\n");
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// setup timer every 1.5 seconds
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struct sigaction oldalrm;
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struct sigaction sigalrm = {.sa_sigaction = OnSigAlrm,
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.sa_flags = SA_SIGINFO};
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CHECK_EQ(0, sigaction(SIGALRM, &sigalrm, &oldalrm));
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struct itimerval oldtimer;
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struct itimerval timer = {{1, 500000}, {1, 500000}};
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CHECK_EQ(0, setitimer(ITIMER_REAL, &timer, &oldtimer));
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// wait for three timeouts
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int i = 0;
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int n = 3;
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while (i < n) {
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pause();
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if (gotalrm) {
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++i;
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printf("got timeout %d out of %d\n", i, n);
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gotalrm = false;
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}
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}
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// teardown timer
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CHECK_EQ(0, setitimer(ITIMER_REAL, &oldtimer, 0));
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CHECK_EQ(0, sigaction(SIGALRM, &oldalrm, 0));
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}
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