SIGRETURN(2) OpenBSD Programmer's Manual SIGRETURN(2)NAMEsigreturn - return from signal
SYNOPSIS
#include <signal.h>
int
sigreturn(struct sigcontext *scp);
DESCRIPTIONsigreturn() allows users to atomically unmask, switch stacks, and return
from a signal context. The processes signal mask and stack status are
restored from the context. 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
longjmp(3) when returning from a signal to the previously executing
program.
Note that sigcontext contains machine dependent information.
NOTES
This system call is not available in 4.2 BSD hence it should not be used
if backward compatibility is needed.
RETURN VALUES
If successful, the system call does not return. Otherwise, a value of -1
is returned and errno is set to indicate the error.
ERRORSsigreturn() will fail and the process context will remain unchanged if
one of the following occurs.
[EFAULT] scp points to memory that is not a valid part of the
process address space.
[EINVAL] The process status longword is invalid or would improperly
raise the privilege level of the process.
SEE ALSOsigaction(2), setjmp(3)HISTORY
The sigreturn() function call appeared in 4.3BSD.
OpenBSD 4.9 May 31, 2007 OpenBSD 4.9