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sigstack.0
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SIGSTACK(2) UNIX Programmer's Manual SIGSTACK(2)
NNAAMMEE
ssiiggssttaacckk - set and/or get signal stack context
SSYYNNOOPPSSIISS
##iinncclluuddee <<ssyyss//ssiiggnnaall..hh>>
struct sigstack {
caddr_t ss_sp;
int ss_onstack;
};
_i_n_t
ssiiggssttaacckk(_c_o_n_s_t _s_t_r_u_c_t _s_i_g_s_t_a_c_k _*_s_s, _s_t_r_u_c_t _s_i_g_s_t_a_c_k _*_o_s_s)
DDEESSCCRRIIPPTTIIOONN
SSiiggssttaacckk() allows users to define an alternate stack on which signals are
to be processed. If _s_s is nonzero, it specifies a _s_i_g_n_a_l _s_t_a_c_k on which
to deliver signals and tells the system if the process is currently exe
cuting on that stack. When a signal's action indicates its handler
should execute on the signal stack (specified with a sigvec(2) call), the
system checks to see if the process is currently executing on that stack.
If the process is not currently executing on the signal stack, the system
arranges a switch to the signal stack for the duration of the signal han
dler's execution. If _o_s_s is nonzero, the current signal stack state is
returned.
NNOOTTEESS
Signal stacks are not ``grown'' automatically, as is done for the normal
stack. If the stack overflows unpredictable results may occur.
RREETTUURRNN VVAALLUUEESS
Upon successful completion, a value of 0 is returned. Otherwise, a value
of 1 is returned and _e_r_r_n_o is set to indicate the error.
EERRRROORRSS
SSiiggssttaacckk() will fail and the signal stack context will remain unchanged
if one of the following occurs.
[EFAULT] Either _s_s or _o_s_s points to memory that is not a valid part of
the process address space.
SSEEEE AALLSSOO
sigvec(2), setjmp(3)
HHIISSTTOORRYY
The ssiiggssttaacckk function call appeared in 4.2BSD.
4.2 Berkeley Distribution March 10, 1991 1