Signals & Timers

Signals

rt_sigaction

Supported functionality in SCML:

// Change and/or retrieve a signal action
rt_sigaction(
    signum,
    act = {
        sa_flags = SA_ONSTACK | SA_RESTART | SA_NODEFER | SA_RESTORER | SA_SIGINFO | SA_RESETHAND,
        ..
    },
    oldact, sigsetsize
);

Unsupported sigaction flags:

• SA_NOCLDSTOP
• SA_NOCLDWAIT

For more information, see the man page.

rt_sigprocmask

Supported functionality in SCML:

// Change and/or retrieve blocked signals
rt_sigprocmask(
    how = SIG_BLOCK | SIG_UNBLOCK | SIG_SETMASK, set, oldset, sigsetsize
);

For more information, see the man page.

POSIX Interval Timers

timer_create

Supported functionality in SCML:

opt_notify_methods = SIGEV_NONE | SIGEV_SIGNAL | SIGEV_THREAD_ID;

// Create a timer with predefined clock source
timer_create(
    clockid = CLOCK_PROCESS_CPUTIME_ID | CLOCK_THREAD_CPUTIME_ID | CLOCK_REALTIME | CLOCK_MONOTONIC | CLOCK_BOOTTIME,
    sevp = <opt_notify_methods>,
    timerid
);

// Create a timer based on a per-process or per-thread clock
timer_create(
    clockid = <INTEGER>,
    sevp = <opt_notify_methods>,
    timerid
);

Unsupported predefined clock IDs:

• CLOCK_REALTIME_ALARM
• CLOCK_BOOTTIME_ALARM
• CLOCK_TAI

Unsupported notification methods:

• SIGEV_THREAD

For more information, see the man page.