I have found the answer. This question should not have been deleted. As a rule only syscalls which are “slow” return EINTR. Slow things are terminal I/O and things which wait (select, wait, sleep, pause, etc). solved Which system calls can return EINTR or EAGAIN error codes? [closed]
The operating system stops running the thread receiving the signal and runs the signal handler. When it returns the original thread restarts where it was. If the signal handler is already running when another signal comes in, the action is configurable in the sigaction call. solved How are signals handled in Unix?
Hmm, interesting case. You want to be able to loop with, let’s just call it hypothetically the largest possible number, and thus wrap-around rather than ever having the comparison return false. Something like this might do the trick: char arr[SIZE_MAX]; size_t i = 0; do { /* whatever you wanna do here */ ++i; } … Read more