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GETCONTEXT(2) Linux Programmer's Manual GETCONTEXT(2)
getcontext, setcontext - get or set the user context
int getcontext(ucontext_t *ucp);
int setcontext(const ucontext_t *ucp);
ucp points to a structure defined in <ucontext.h> containing the signal mask, execution
stack, and machine registers.
getcontext(2) gets the current context of the calling process, storing it in the ucontext
struct pointed to by ucp.
setcontext(2) sets the context of the calling process to the state stored in the ucontext
struct pointed to by ucp. The struct must either have been created by getcontext(2) or
have been passed as the third parameter of the sigaction(2) signal handler.
The ucontext struct created by getcontext(2) is defined in <ucontext.h> as follows:
typedef struct ucontext
unsigned long int uc_flags;
struct ucontext *uc_link;
struct _fpstate __fpregs_mem;
getcontext(2) returns 0 on success and -1 on failure. setcontext(2) does not return a
value on success and returns -1 on failure.
These functions comform to: XPG4-UNIX.
When a signal handler executes, the current user context is saved and a new context is
created by the kernel. If the calling process leaves the signal handler using longjmp(2),
the original context cannot be restored, and the result of future calls to getcontext(2)
are unpredictable. To avoid this problem, use siglongjmp(2) or setcontext(2) in signal
handlers instead of longjmp(2).
sigaction(2), sigaltstack(2), sigprocmask(2), sigsetjmp(3), setjmp(3).
Red Hat Linux 6.1 20 September 1999 GETCONTEXT(2)
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