siginterrupt - allow signals to interrupt system calls
int siginterrupt(int sig, int flag);
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 transferred.
The siginterrupt() function returns 0 on success, or -1 if the signal
number sig is invalid.
EINVAL The specified signal number is invalid.
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