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'\" t
.\" Manual page created with latex2man on Thu Aug 16 09:44:45 MDT 2007
.\" NOTE: This file is generated, DO NOT EDIT.
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.TH "UNW\\_IS\\_SIGNAL\\_FRAME" "3" "16 August 2007" "Programming Library " "Programming Library "
.SH NAME
unw_is_signal_frame
\-\- check if current frame is a signal frame
.PP
.SH SYNOPSIS
.PP
#include <libunwind.h>
.br
.PP
int
unw_is_signal_frame(unw_cursor_t *cp);
.br
.PP
.SH DESCRIPTION
.PP
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.
.PP
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.
.PP
.SH RETURN VALUE
.PP
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.
.PP
.SH THREAD AND SIGNAL SAFETY
.PP
unw_is_signal_frame()
is thread\-safe as well as safe to use
from a signal handler.
.PP
.SH ERRORS
.PP
.TP
UNW_ENOINFO
Libunwind
is unable to determine
whether or not the current frame is a signal frame.
.PP
.SH SEE ALSO
.PP
libunwind(3),
unw_get_reg(3),
unw_set_reg(3),
unw_get_fpreg(3),
unw_set_fpreg(3)
.PP
.SH AUTHOR
.PP
David Mosberger\-Tang
.br
Email: \fBdmosberger@gmail.com\fP
.br
WWW: \fBhttp://www.nongnu.org/libunwind/\fP\&.
.\" NOTE: This file is generated, DO NOT EDIT.
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