siginterrupt - allow signals to interrupt system calls
The siginterrupt() function changes the restart behavior 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 behavior in Linux.
flag argument is true (1) and no data has been transferred, then a system call interrupted by the signal
sig will return -1 and
errno will be set to EINTR.
flag 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. It returns -1 if the signal number
sig is invalid, with
errno set to indicate the cause of the error.
The specified signal number is invalid.
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