A system call to sleep returns 0 as it should, but set errno to 60 "ETIMEDOUT Operation timed out." which it really shouldn't, especially on a return of 0.
https://pubs.opengroup.org/onlinepubs/009695399/functions/sleep.html states "No errors are defined." Here's some C proof.
#include <stdio.h>
#include <unistd.h>
#include <sys/errno.h>
int main(int argc, char **argv) {
printf("this looks good: %d\n", sleep(1));
printf("this does not: %d\n", errno);
}
And the output.
this looks good: 0
this does not: 60
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