setcontext(2) - NetBSD Manual Pages

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GETCONTEXT(2)             NetBSD System Calls Manual             GETCONTEXT(2)

getcontext, setcontext -- get and set current user context
Standard C Library (libc, -lc)
#include <ucontext.h> int getcontext(ucontext_t *ucp); int setcontext(const ucontext_t *ucp);
The getcontext() function initializes the object pointed to by ucp to the current user context of the calling thread. The user context defines a thread's execution environment and includes the contents of its machine registers, its signal mask, and its current execution stack. The setcontext() function restores the user context defined in the object pointed to by ucp as most recently initialized by a previous call to either getcontext() or makecontext(3). If successful, execution of the program resumes as defined in the ucp argument, and setcontext() will not return. If ucp was initialized by the getcontext() function, program execution continues as if the corresponding invocation of getcontext() had just returned (successfully). If ucp was initialized by the makecontext(3) function, program execution continues with the function (and function arguments) passed to makecontext(3).
On successful completion, getcontext() returns 0 and setcontext() does not return. Otherwise a value of -1 is returned and errno is set to indicate the error.
The getcontext() and setcontext() functions will fail if: [EFAULT] The ucp argument points to an invalid address. The setcontext() function will fail if: [EINVAL] The contents of the datum pointed to by ucp are invalid.
sigprocmask(2), longjmp(3), makecontext(3), setjmp(3), swapcontext(3)
The getcontext() and setcontext() functions conform to X/Open System Interfaces and Headers Issue 5 (``XSH5''). The errno indications are an extension to the standard.
The getcontext() and setcontext() functions first appeared in AT&T System V.4 UNIX. NetBSD 5.0.1 October 28, 1999 NetBSD 5.0.1
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