_stack_grow(3C) Standard C Library Functions _stack_grow(3C)NAME
_stack_grow - express an intention to extend the stack
SYNOPSIS
#include <ucontext.h>
void *_stack_grow(void *addr);
DESCRIPTION
The _stack_grow() function indicates to the system that the stack is about to be extended to the address specified by addr. If extending
the stack to this address would violate the stack boundaries as retreived by stack_getbounds(3C), a SIGSEGV is raised.
If the disposition of SIGSEGV is SIG_DFL, the process is terminated and a core dump is generated. If the application has installed its own
SIGSEGV handler to run on the alternate signal stack, the signal information passed to the handler will be such that a call to stack_viola-
tion(3C) with these parameters returns 1.
The addr argument is a biased stack pointer value. See the Solaris 64-bit Developer's Guide.
This function has no effect if the specified address, addr, is within the bounds of the current stack.
RETURN VALUES
If the _stack_grow() function succeeds and does not detect a stack violation, it returns addr.
ERRORS
No errors are defined.
USAGE
The _stack_grow() function does not actually adjust the stack pointer register. The caller is responsible for manipulating the stack
pointer register once _stack_grow() returns.
The _stack_grow() function is typically invoked by code created by the compilation environment prior to executing code that modifies the
stack pointer. It can also be used by hand-written assembly routines to allocate stack-based storage safely.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Evolving |
+-----------------------------+-----------------------------+
|MT-Level |Async-Signal-Safe |
+-----------------------------+-----------------------------+
SEE ALSO stack_getbounds(3C), stack_inbounds(3C), stack_violation(3C), attributes(5)
Solaris 64-bit Developer's Guide
SunOS 5.11 18 Jul 2002 _stack_grow(3C)
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stack_violation(3C) Standard C Library Functions stack_violation(3C)NAME
stack_violation - determine stack boundary violation event
SYNOPSIS
#include <ucontext.h>
int stack_violation(int sig, const siginfo_t *sip, const ucontext_t *ucp);
DESCRIPTION
The stack_violation() function returns a boolean value indicating whether the signal, sig, and accompanying signal information, sip, and
saved context, ucp, represent a stack boundary violation event or a stack overflow.
RETURN VALUES
The stack_violation() function returns 0 if the signal does not represent a stack boundary violation event and 1 if the signal does repre-
sent a stack boundary violation event.
ERRORS
No errors are defined.
EXAMPLES
Example 1: Set up a signal handler to run on an alternate stack.
The following example sets up a signal handler for SIGSEGV to run on an alternate signal stack. For each signal it handles, the handler
emits a message to indicate if the signal was produced due to a stack boundary violation.
#include <stdlib.h>
#include <unistd.h>
#include <ucontext.h>
#include <signal.h>
static void
handler(int sig, siginfo_t *sip, void *p)
{
ucontext_t *ucp = p;
const char *str;
if (stack_violation(sig, sip, ucp))
str = "stack violation.
";
else
str = "no stack violation.
";
(void) write(STDERR_FILENO, str, strlen(str));
exit(1);
}
int
main(int argc, char **argv)
{
struct sigaction sa;
stack_t altstack;
altstack.ss_size = SIGSTKSZ;
altstack.ss_sp = malloc(SIGSTKSZ);
altstack.ss_flags = 0;
(void) sigaltstack(&altstack, NULL);
sa.sa_sigaction = handler;
(void) sigfillset(&sa.sa_mask);
sa.sa_flags = SA_ONSTACK | SA_SIGINFO;
(void) sigaction(SIGSEGV, &sa, NULL);
/*
* The application is now set up to use stack_violation(3C).
*/
return(0);
}
USAGE
An application typically uses stack_violation() in a signal handler that has been installed for SIGSEGV using sigaction(2) with the SA_SIG-
INFO flag set and is configured to run on an alternate signal stack.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |Evolving |
+-----------------------------+-----------------------------+
|MT-Level |Async-Signal-Safe |
+-----------------------------+-----------------------------+
SEE ALSO sigaction(2), sigaltstack(2), stack_getbounds(3C), stack_inbounds(3C), stack_setbounds(3C), attributes(5)SunOS 5.10 18 Jul 2002 stack_violation(3C)