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 9.0 |