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NetBSD 6.1.5 - man page for siginterrupt (netbsd section 3)

SIGINTERRUPT(3) 		   BSD Library Functions Manual 		  SIGINTERRUPT(3)

NAME
     siginterrupt -- allow signals to interrupt system calls

LIBRARY
     Standard C Library (libc, -lc)

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 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.

NOTES
     This library routine uses an extension of the sigaction(2) system call that is not available
     in 4.2BSD, hence it should not be used if backward compatibility is needed.

RETURN VALUES
     A 0 value indicates that the call succeeded.  A -1 value indicates that an invalid signal
     number has been supplied.

SEE ALSO
     sigaction(2), sigprocmask(2), sigsuspend(2)

HISTORY
     The siginterrupt() function appeared in 4.3BSD.

BSD					   June 4, 1993 				      BSD


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