_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 alter-
nate signal stack, the signal information passed to the
handler will be such that a call to stack_violation(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 mani-
pulating 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 attri-
butes:
____________________________________________________________
| 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
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