NOSTK(2) System Calls Manual NOSTK(2)NAME
nostk - allow process to manage its own stack (2BSD)
SYNOPSYS
nostk();
DESCRIPTION
Nostk informs the system that the process wishes to manage its own stack. The system releases the stack segment(s) it has reserved, making
them available for allocation (via brk(2)) by the user.
C programs should use nostk only with great caution and understanding of the C language calling and stack conventions. It is most useful
for assembler programs that want to use the entire available address space.
SEE ALSO stack(5)BUGS
Nostk is unique to the PDP-11 and 2BSD; its use is discouraged.
3rd Berkeley Distribution June 24, 1987 NOSTK(2)
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SIGSTACK(2) System Calls Manual SIGSTACK(2)NAME
sigstack - set and/or get signal stack context
SYNOPSIS
#include <signal.h>
struct sigstack {
caddr_t ss_sp;
int ss_onstack;
};
sigstack(ss, oss);
struct sigstack *ss, *oss;
DESCRIPTION
Sigstack allows users to define an alternate stack on which signals are to be processed. If ss is non-zero, it specifies a signal stack on
which to deliver signals and tells the system if the process is currently executing 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 execut-
ing 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 handler's execution. If oss is non-zero, the current signal stack state is returned.
NOTES
Signal stacks are not ``grown'' automatically, as is done for the normal stack. If the stack overflows unpredictable results may occur.
RETURN VALUE
Upon successful completion, a value of 0 is returned. Otherwise, a value of -1 is returned and errno is set to indicate the error.
ERRORS
Sigstack will fail and the signal stack context will remain unchanged if one of the following occurs.
[EFAULT] Either ss or oss points to memory that is not a valid part of the process address space.
SEE ALSO sigvec(2), setjmp(3)4.2 Berkeley Distribution June 30, 1985 SIGSTACK(2)
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