|SIGRETURN(2)||System Calls Manual||SIGRETURN(2)|
sigreturn — return
sigreturn() syscall is used by the
signal handling facility to atomically switch stacks, restore registers and
the thread's signal mask, and return from a signal context to resume the
processing that was interrupted by the signal.
Note that sigcontext contains machine dependent information.
Direct use of
sigreturn is no longer
supported and it is not provided as a function. As used in the signal
trampoline provided by the system, if
fails and returns then the process is terminated.
If successful, the system call does not return. Otherwise, a value of -1 is returned and errno is set to indicate the error.
sigreturn() will fail and the process
context will remain unchanged if one of the following occurs.
sigreturn() function appeared in
4.3BSD. The function was removed from libc in
|May 9, 2016||OpenBSD-current|