cosmopolitan/examples/hertz.c
Justine Tunney 1966369e8e Fix bugs and make improvements
- Fix regression with `%lu`
- Added some more headers witnessed in the wild
- Added `-M INT` option to redbean to tune max payload size
- Work around InfoZIP 256 character limit on comment line size
2021-05-01 05:11:35 -07:00

43 lines
1.4 KiB
C

#if 0
/*─────────────────────────────────────────────────────────────────╗
│ To the extent possible under law, Justine Tunney has waived │
│ all copyright and related or neighboring rights to this file, │
│ as it is written in the following disclaimers: │
│ • http://unlicense.org/ │
│ • http://creativecommons.org/publicdomain/zero/1.0/ │
╚─────────────────────────────────────────────────────────────────*/
#endif
#include "libc/calls/calls.h"
#include "libc/calls/struct/itimerval.h"
#include "libc/errno.h"
#include "libc/log/check.h"
#include "libc/stdio/stdio.h"
#include "libc/sysv/consts/itimer.h"
#include "libc/sysv/consts/sig.h"
#include "libc/time/time.h"
#include "libc/x/x.h"
const struct itimerval kHertz = {
{1, 0},
{0, 1},
};
bool hertz;
void OnAlrm(void) {
hertz = true;
}
int main(int argc, char *argv[]) {
CHECK_NE(-1, xsigaction(SIGALRM, OnAlrm, 0, 0, 0));
CHECK_NE(-1, setitimer(ITIMER_REAL, &kHertz, NULL));
for (;;) {
CHECK_EQ(-1, pause());
CHECK_EQ(EINTR, errno);
if (hertz) {
hertz = false;
printf("ding\n");
}
}
return 0;
}