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UNW_IS...L_FRAME(3libunwind) Programming Library UNW_IS...L_FRAME(3libunwind) NAME unw_is_signal_frame -- check if current frame is a signal frame SYNOPSIS #include <libunwind.h> int unw_is_signal_frame(unw_cursor_t *cp); DESCRIPTION The unw_is_signal_frame() routine returns a positive value if the current frame identified by cp is a signal frame, also known as a signal trampo- line, 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 asyn- chronous interruption. For UNIX and UNIX-like platforms, such frames are normally created by the kernel when delivering a signal. In a kernel envi- ronment, 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. RETURN VALUE 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 nega- tive 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. ERRORS UNW_ENOINFO Libunwind is unable to determine whether or not the current frame is a signal frame. SEE ALSO libunwind(3libunwind), unw_get_reg(3libunwind), unw_set_reg(3libunwind), unw_get_fpreg(3libunwind), unw_set_fpreg(3libunwind) AUTHOR David Mosberger-Tang Email: dmosberger@gmail.com WWW: http://www.nongnu.org/libunwind/. Programming Library 29 August 2023 UNW_IS...L_FRAME(3libunwind)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | THREAD AND SIGNAL SAFETY | ERRORS | SEE ALSO | AUTHOR
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