sigreturn - return from signal
sigreturn(struct sigcontext *scp);
sigreturn() allows users to atomically unmask, switch
stacks, and return
from a signal context. The processes signal mask and stack
restored from the context. The system call does not return;
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
when returning from a signal to the previously executing
Note that sigcontext contains machine dependent information.
This system call is not available in 4.2 BSD hence it should
not be used
if backward compatibility is needed.
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
one of the following occurs.
[EFAULT] scp points to memory that is not a valid part
of the process
[EINVAL] The process status longword is invalid or
raise the privilege level of the process.
The sigreturn() function call appeared in 4.3BSD.
OpenBSD 3.6 June 4, 1993
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