return from signal
() 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 sigreturn
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
() will fail and the process context will
remain unchanged if one of the following occurs.
- scp points to memory that
is not a valid part of the process address space.
- The sigcontext provided is invalid or would improperly
raise the privilege level of the process.
() function appeared in
. The function was removed from libc in