Function nc::rt_sigsuspend

source · 
pub unsafe fn rt_sigsuspend(
    set: &sigset_t,
    sigsetsize: size_t
) -> Result<(), Errno>
Expand description

Wait for a signal.

Always returns Errno, normally EINTR.

§Example

use core::mem::size_of;

let pid = unsafe { nc::fork() };
assert!(pid.is_ok());
let pid = pid.unwrap();
assert!(pid >= 0);

if pid == 0 {
    // child process.
    let mask = nc::sigset_t::default();
    let ret = unsafe { nc::rt_sigsuspend(&mask, size_of::<nc::sigset_t>()) };
    assert!(ret.is_ok());
} else {
    // parent process.
    let t = nc::timespec_t {
        tv_sec: 1,
        tv_nsec: 0,
    };
    let ret = unsafe { nc::nanosleep(&t, None) };
    assert!(ret.is_ok());

    let ret = unsafe { nc::kill(pid, nc::SIGTERM) };
    assert!(ret.is_ok());
}
Examples found in repository?
examples/resource_limit.rs (line 48)
39
40
41
42
43
44
45
46
47
48
49

fn main() {
    let pid = unsafe { nc::getpid() };
    println!("pid: {}", pid);

    get_file_limit();
    set_file_limit();
    get_file_limit();

    let mask = nc::sigset_t::default();
    let _ret = unsafe { nc::rt_sigsuspend(&mask, size_of::<nc::sigset_t>()) };
}
More examples
Hide additional examples
examples/prctl.rs (line 21)
14
15
16
17
18
19
20
21
22

fn main() {
    let process_name = "rust-001";
    let pid = unsafe { nc::getpid() };
    println!("pid: {}, process name: {}", pid, &process_name);
    set_process_name(process_name).unwrap();

    let mask = nc::sigset_t::default();
    let _ret = unsafe { nc::rt_sigsuspend(&mask, size_of::<nc::sigset_t>()) };
}
examples/alarm.rs (line 28)
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33

fn main() {
    let sa = nc::sigaction_t {
        sa_handler: handle_alarm as nc::sighandler_t,
        sa_flags: nc::SA_RESTART,
        ..nc::sigaction_t::default()
    };
    println!("sa.sa_mask size: {}", size_of_val(&sa));
    let mut old_sa = nc::sigaction_t::default();
    let ret = unsafe { nc::rt_sigaction(nc::SIGALRM, &sa, &mut old_sa, size_of::<nc::sigset_t>()) };
    assert!(ret.is_ok());

    let seconds = 1;
    let remaining = nc::util::alarm(seconds);

    let mask = nc::sigset_t::default();
    let ret = unsafe { nc::rt_sigsuspend(&mask, size_of::<nc::sigset_t>()) };
    assert!(ret.is_err());
    assert_eq!(ret, Err(nc::EINTR));

    assert_eq!(remaining.unwrap(), 0);
}
examples/timer.rs (line 39)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46

fn main() {
    use core::mem::size_of;

    fn handle_alarm(signum: i32) {
        assert_eq!(signum, nc::SIGALRM);
        let msg = "Hello alarm";
        let _ = unsafe { nc::write(2, msg.as_ptr() as usize, msg.len()) };
    }

    let sa = nc::sigaction_t {
        sa_handler: handle_alarm as nc::sighandler_t,
        sa_flags: 0,
        ..nc::sigaction_t::default()
    };
    let mut old_sa = nc::sigaction_t::default();
    let ret = unsafe { nc::rt_sigaction(nc::SIGALRM, &sa, &mut old_sa, size_of::<nc::sigset_t>()) };
    assert!(ret.is_ok());

    // Single shot timer, actived after 1 second.
    let itv = nc::itimerval_t {
        it_value: nc::timeval_t {
            tv_sec: 1,
            tv_usec: 0,
        },
        it_interval: nc::timeval_t {
            tv_sec: 0,
            tv_usec: 0,
        },
    };
    let mut prev_itv = nc::itimerval_t::default();
    let ret = unsafe { nc::setitimer(nc::ITIMER_REAL, &itv, &mut prev_itv) };
    assert!(ret.is_ok());

    let ret = unsafe { nc::getitimer(nc::ITIMER_REAL, &mut prev_itv) };
    assert!(ret.is_ok());
    assert!(prev_itv.it_value.tv_sec <= itv.it_value.tv_sec);

    let mask = nc::sigset_t::default();
    let ret = unsafe { nc::rt_sigsuspend(&mask, size_of::<nc::sigset_t>()) };
    assert!(ret.is_err());

    let ret = unsafe { nc::getitimer(nc::ITIMER_REAL, &mut prev_itv) };
    assert!(ret.is_ok());
    assert_eq!(prev_itv.it_value.tv_sec, 0);
    assert_eq!(prev_itv.it_value.tv_usec, 0);
}