Table of Contents
#include <libunwind.h>
int
unw_is_signal_frame(unw_cursor_t *cp);
The unw_is_signal_frame()
routine returns a positive value
if the current frame identified by cp
is a signal frame, and a
value of 0 otherwise. For the purpose of this discussion, a signal
frame is a frame that was created in response to a potentially
asynchronous interruption. For UNIX and UNIX-like platforms, such
frames are normally created by the kernel when delivering a signal.
In a kernel-environment, a signal frame might, for example, correspond
to a frame created in response to a device interrupt.
Signal frames are somewhat unusual because the asynchronous nature of
the events that create them require storing the contents of registers
that are normally treated as scratch (``caller-saved'') registers.
On successful completion, unw_is_signal_frame()
returns a
positive value if the current frame is a signal frame, or 0 if it is
not. Otherwise, a negative value of one of the error-codes below is
returned.
unw_is_signal_frame()
is thread-safe as well as safe to use
from a signal handler.
- UNW_ENOINFO
- Libunwind
is unable to determine
whether or not the current frame is a signal frame.
libunwind(3),
unw_get_reg(3),
unw_set_reg(3),
unw_get_fpreg(3),
unw_set_fpreg(3)
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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