UNW_IS_SIGNAL_FRAME(3) Programming Library UNW_IS_SIGNAL_FRAME(3)NAME
unw_is_signal_frame -- check if current frame is a signal frame
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 other-
wise. For the purpose of this discussion, a signal frame is a frame that was created in response to a potentially asynchronous interrup-
tion. 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. Other-
wise, a negative value of one of the error-codes below is returned.
THREAD AND SIGNAL SAFETY
unw_is_signal_frame() is thread-safe as well as safe to use from a signal handler.
Libunwind is unable to determine whether or not the current frame is a signal frame.
SEE ALSO libunwind(3), unw_get_reg(3), unw_set_reg(3), unw_get_fpreg(3), unw_set_fpreg(3)AUTHOR
Programming Library 16 August 2007 UNW_IS_SIGNAL_FRAME(3)
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UNW_GET_REG(3) Programming Library UNW_GET_REG(3)NAME
unw_get_reg -- get register contents
int unw_get_reg(unw_cursor_t *cp, unw_regnum_t reg, unw_word_t *valp);
The unw_get_reg() routine reads the value of register reg in the stack frame identified by cursor cp and stores the value in the word
pointed to by valp.
The register numbering is target-dependent and described in separate manual pages (e.g., libunwind-ia64(3) for the IA-64 target). Further-
more, the exact set of accessible registers may depend on the type of frame that cp is referring to. For ordinary stack frames, it is nor-
mally possible to access only the preserved (``callee-saved'') registers and frame-related registers (such as the stack-pointer). However,
for signal frames (see unw_is_signal_frame(3)), it is usually possible to access all registers.
Note that unw_get_reg() can only read the contents of registers whose values fit in a single word. See unw_get_fpreg(3) for a way to read
registers which do not fit this constraint.
On successful completion, unw_get_reg() returns 0. Otherwise the negative value of one of the error-codes below is returned.
THREAD AND SIGNAL SAFETY
unw_get_reg() is thread-safe as well as safe to use from a signal handler.
An unspecified error occurred.
An attempt was made to read a register that is either invalid or not accessible in the current frame.
In addition, unw_get_reg() may return any error returned by the access_mem(), access_reg(), and access_fpreg() call-backs (see unw_cre-
SEE ALSO libunwind(3), libunwind-ia64(3), unw_get_fpreg(3), unw_is_signal_frame(3), unw_set_reg(3)AUTHOR
Programming Library 16 August 2007 UNW_GET_REG(3)
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