| SIGINTERRUPT(3) | Library Functions Manual | SIGINTERRUPT(3) | 
siginterrupt —
#include <signal.h>
int
  
  siginterrupt(int
    sig, int flag);
siginterrupt() function is used to change the system
  call restart behavior when a system call is interrupted by the specified
  signal. If the flag is false (0), then system calls will be restarted if they
  are interrupted by the specified signal and no data has been transferred yet.
  System call restart is the default behavior on 4.2BSD.
If the flag is true (1), then restarting of system calls is
    disabled. If a system call is interrupted by the specified signal and no
    data has been transferred, the system call will return -1 with the global
    variable errno set to EINTR.
    Interrupted system calls that have started transferring data will return the
    amount of data actually transferred. System call interrupt is the signal
    behavior found on 4.1BSD and
    AT&T System V UNIX systems.
Note that the new 4.2BSD signal handling semantics are not altered in any other way. Most notably, signal handlers always remain installed until explicitly changed by a subsequent sigaction(2) call, and the signal mask operates as documented in sigaction(2). Programs may switch between restartable and interruptible system call operation as often as desired in the execution of a program.
Issuing a
    siginterrupt(3) call during
    the execution of a signal handler will cause the new action to take place on
    the next signal to be caught.
siginterrupt() function appeared in
  4.3BSD.
| June 4, 1993 | NetBSD 9.4 |