Manual Reference Pages - SIGRETURN (2)
- return from signal
sigreturn const ucontext_t *scp
allows users to atomically unmask, switch stacks,
and return from a signal context.
The threads signal mask and stack status are
restored from the context structure pointed to by
The system call does not return;
the users stack pointer, frame pointer, argument pointer,
and processor status longword are restored from the context.
Execution resumes at the specified pc.
This system call is used by the trampoline code and
when returning from a signal to the previously executing program.
If successful, the system call does not return.
Otherwise, a value of -1 is returned and
is set to indicate the error.
will fail and the thread context will remain unchanged
if one of the following occurs.
points to memory that is not a valid part of the process
The process status longword is invalid or would improperly
raise the privilege level of the process.
system call appeared in
BSD 4.3 .
Visit the GSP FreeBSD Man Page Interface.
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