setustack(2)

1getustack(2)                     System Calls                     getustack(2)
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NAME

6       getustack,  setustack - retrieve or change the address of per-LWP stack
7       boundary information
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SYNOPSIS

10       #include <ucontext.h>
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12       int getustack(stack_t **spp);
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15       int setustack(stack_t *sp);
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DESCRIPTION

19       The getustack() function retrieves the address of per-LWP stack  bound‐
20       ary  information.   The address is stored at the location pointed to by
21       spp. If this address has not been defined  using  a  previous  call  to
22       setustack(), NULL is stored at the location pointed to by spp.
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25       The  setustack()  function  changes the address of the current thread's
26       stack boundary information to the value of sp.
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RETURN VALUES

29       Upon successful completion, these functions return 0. Otherwise, −1  is
30       returned and errno is set to indicate the error.
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ERRORS

33       These functions will fail if:
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35       EFAULT    The spp or sp argument does not refer to a valid address.
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USAGE

39       Only  implementors of custom threading libraries should use these func‐
40       tions to get and set the address of the stack bound to an internal per-
41       thread  data  structure. Other users should use stack_getbounds(3C) and
42       stack_setbounds(3C).
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ATTRIBUTES

45       See attributes(5) for descriptions of the following attributes:
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50       ┌────────────────────────────────────────────────────────┬───────────────────┐
51       │                    ATTRIBUTE TYPE                      │  ATTRIBUTE VALUE  │
52       ├────────────────────────────────────────────────────────┼───────────────────┤
53       │Interface Stability                                     │ Evolving          │
54       ├────────────────────────────────────────────────────────┼───────────────────┤
55       │MT-Level                                                │ Async-Signal-Safe │
56       └────────────────────────────────────────────────────────┴───────────────────┘
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