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getustack(2) [sunos man page]

getustack(2)							   System Calls 						      getustack(2)

getustack, setustack - retrieve or change the address of per-LWP stack boundary information SYNOPSIS
#include <ucontext.h> int getustack(stack_t **spp); int setustack(stack_t *sp); DESCRIPTION
The getustack() function retrieves the address of per-LWP stack boundary information. The address is stored at the location pointed to by spp. If this address has not been defined using a previous call to setustack(), NULL is stored at the location pointed to by spp. The setustack() function changes the address of the current thread's stack boundary information to the value of sp. RETURN VALUES
Upon successful completion, these functions return 0. Otherwise, -1 is returned and errno is set to indicate the error. ERRORS
These functions will fail if: EFAULT The spp or sp argument does not refer to a valid address. USAGE
Only implementors of custom threading libraries should use these functions to get and set the address of the stack bound to an internal per-thread data structure. Other users should use stack_getbounds(3C) and stack_setbounds(3C). 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_grow(3C), stack_getbounds(3C), stack_inbounds(3C), stack_setbounds(3C), stack_violation(3C), attributes(5) SunOS 5.10 2 Nov 2004 getustack(2)

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_stack_grow(3C) 					   Standard C Library Functions 					   _stack_grow(3C)

_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 5.10 18 Jul 2002 _stack_grow(3C)
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