siginterrupt



SIGINTERRUPT(3)           OpenBSD Programmer's Manual          SIGINTERRUPT(3)


NAME

     siginterrupt - allow signals to interrupt system calls


SYNOPSIS

     #include <signal.h>

     int
     siginterrupt(int sig, int flag);


DESCRIPTION

     The siginterrupt() function is used to change the system call restart
     behavior when a system call is interrupted by the specified signal.  If
     flag is false (0), system calls will be restarted if they are interrupted
     by the specified signal sig and no data has been transferred yet.  System
     call restart is the default behavior on OpenBSD.

     If flag is true (1), the 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 BSD systems prior
     to 4.2BSD as well as most systems based upon AT&T System V UNIX.

     Programs may switch between restartable and interruptible system call
     operation as often as desired in the execution of a program.  Issuing a
     siginterrupt() call during the execution of a signal handler will cause
     the new action to take place on the next signal to be caught.


RETURN VALUES

     siginterrupt() returns 0 on success or -1 if an invalid signal number has
     been specified.


SEE ALSO

     sigaction(2), sigprocmask(2), sigsuspend(2)


HISTORY

     The siginterrupt() function appeared in 4.3BSD.

OpenBSD 5.4                      June 5, 2013                      OpenBSD 5.4

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