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unw_getcontext
Langue: en
Version: 30 March 2004 (openSuse - 09/10/07)
Section: 3 (Bibliothèques de fonctions)
Sommaire
NAME
unw_getcontext -- get initial machine-stateSYNOPSIS
#include <libunwind.h>
int unw_getcontext(unw_context_t *ucp);
DESCRIPTION
The unw_getcontext() routine initializes the context structure pointed to by ucp with the machine-state of the call-site. The exact set of registers stored by unw_getcontext() is platform-specific, but, in general, at least all preserved (``callee-saved'') and all frame-related registers, such as the stack-pointer, will be stored.
This routine is normally implemented as a macro and applications should not attempt to take its address.
PLATFORM-SPECIFIC NOTES
On IA-64, unw_context_t has a layout that is compatible with that of ucontext_t and such structures can be initialized with getcontext() instead of unw_getcontext(). However, the reverse is not true and it is not safe to use structures initialized by unw_getcontext() in places where a structure initialized by getcontext() is expected. The reason for this asymmetry is that unw_getcontext() is optimized for maximum performance and does not, for example, save the signal mask.
RETURN VALUE
On successful completion, unw_getcontext() returns 0. Otherwise, a value of -1 is returned.
THREAD AND SIGNAL SAFETY
unw_getcontext() is thread-safe as well as safe to use from a signal handler.
SEE ALSO
libunwind(3), unw_init_local(3)
AUTHOR
David Mosberger-Tang
Hewlett-Packard Labs
Palo-Alto, CA 94304
Email: davidm@hpl.hp.com
WWW: http://www.hpl.hp.com/research/linux/libunwind/.
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