The siginterrupt() function changes the restart behaviour when a system
call is interrupted by the signal sig. If the flag argument is
false (0), then system calls will be restarted if interrupted by the specified
signal sig. This is the default behaviour in Linux. However, when a new
signal handler is specified with the signal(2) function, the system
call is interrupted by default.
If the flags argument is true (1) and no data has been transferred, then
a system call interrupted by the signal sig will return -1 and the
global variable errno will be set to EINTR.
If the flags argument is true (1) and data transfer has started, then the
system call will be interrupted and will return the actual amount of data