(BSD System Compatibility)

siginterrupt(3bsd)

siginterrupt -- (BSD) allow signals to interrupt system calls

Synopsis

   /usr/ucb/cc [flag . . . ] file . . .
   
   int siginterrupt(int sig, int flag);

Description

siginterrupt 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 when the signal(3bsd) routine is used.

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 errno set to EINTR. Interrupted system calls that have started transferring data will return the amount of data actually transferred.

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

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

References

sigblock(3bsd), signal(2), signal(3bsd), sigpause(3bsd), sigsetmask(3bsd), sigvec(3bsd)

Notices

This library routine uses an extension of the sigvec(3bsd) system call that is not available in 4.2BSD, hence it should not be used if backward compatibility is needed.