NAME
       ualarm - schedule signal after given number of microseconds

SYNOPSIS
       #include

       useconds_t ualarm(useconds_t usecs, useconds_t interval);

...

       The sigaction structure is defined as something like

           struct sigaction {
               void     (*sa_handler)(int);
               void     (*sa_sigaction)(int, siginfo_t *, void *);
               sigset_t   sa_mask;
               int        sa_flags;
               void     (*sa_restorer)(void);
           };