UNW_FLUSH_CACHE(3) Programming Library UNW_FLUSH_CACHE(3)NAME
unw_flush_cache -- flush cached info
SYNOPSIS
#include <libunwind.h>
void unw_flush_cache(unw_addr_space_t as, unw_word_t lo, unw_word_t hi);
DESCRIPTION
The unw_flush_cache() routine flushes all cached info as it relates to address-range lo to hi (non-inclusive) in the target address-space
as. In addition, all info cached for address-space as that is not tied to a particular code-range is also flushed. For example, the
address of the dynamic registration list is not tied to a code-range and its cached value (if any) is flushed by a call to this routine.
The address range specified by lo and hi should be understood as a hint: unw_flush_cache() may flush more information than requested, but
never less. In other words, unw_flush_cache() may overflush, but not underflush.
As a special case, if arguments lo and hi are both 0, all information cached on behalf of address space as is flushed.
RETURN VALUE
The unw_flush_cache() routine cannot fail and does not return a value.
THREAD AND SIGNAL SAFETY
The unw_flush_cache() routine is thread-safe as well as safe to use from a signal handler.
SEE ALSO libunwind(3), unw_set_caching_policy(3)AUTHOR
David Mosberger-Tang
Email: dmosberger@gmail.com
WWW: http://www.nongnu.org/libunwind/.
Programming Library 16 August 2007 UNW_FLUSH_CACHE(3)
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UNW_GET_PROC_INFO(3) Programming Library UNW_GET_PROC_INFO(3)NAME
unw_get_proc_info -- get info on current procedure
SYNOPSIS
#include <libunwind.h>
int unw_get_proc_info(unw_cursor_t *cp, unw_proc_info_t *pip);
DESCRIPTION
The unw_get_proc_info() routine returns auxiliary information about the procedure that created the stack frame identified by argument cp.
The pip argument is a pointer to a structure of type unw_proc_info_t which is used to return the information. The unw_proc_info_t has the
following members:
unw_word_t start_ip
The address of the first instruction of the procedure. If this address cannot be determined (e.g., due to lack of unwind informa-
tion), the start_ip member is cleared to 0.
unw_word_t end_ip
The address of the first instruction beyond the end of the procedure. If this address cannot be determined (e.g., due to lack of
unwind information), the end_ip member is cleared to 0.
unw_word_t lsda
The address of the language-specific data-area (LSDA). This area normally contains language-specific information needed during
exception handling. If the procedure has no such area, this member is cleared to 0.
unw_word_t handler
The address of the exception handler routine. This is sometimes called the personality routine. If the procedure does not define a
personality routine, the handler member is cleared to 0.
unw_word_t gp
The global-pointer of the procedure. On platforms that do not use a global pointer, this member may contain an undefined value. On
all other platforms, it must be set either to the correct global-pointer value of the procedure or to 0 if the proper global-pointer
cannot be obtained for some reason.
unw_word_t flags
A set of flags. There are currently no target-independent flags. For the IA-64 target, the flag UNW_PI_FLAG_IA64_RBS_SWITCH is set
if the procedure may switch the register-backing store.
int format
The format of the unwind-info for this procedure. If the unwind-info consists of dynamic procedure info, format is equal to
UNW_INFO_FORMAT_DYNAMIC. If the unwind-info consists of a (target-specific) unwind table, it is equal to to UNW_INFO_FORMAT_TABLE.
All other values are reserved for future use by libunwind. This member exists for use by the find_proc_info() call-back (see
unw_create_addr_space(3)). The unw_get_proc_info() routine may return an undefined value in this member.
int unwind_info_size
The size of the unwind-info in bytes. This member exists for use by the find_proc_info() call-back (see unw_create_addr_space(3)).
The unw_get_proc_info() routine may return an undefined value in this member.
void *unwind_info
The pointer to the unwind-info. If no unwind info is available, this member must be set to NULL. This member exists for use by
the find_proc_info() call-back (see unw_create_addr_space(3)). The unw_get_proc_info() routine may return an undefined value in
this member.
Note that for the purposes of libunwind, the code of a procedure is assumed to occupy a single, contiguous range of addresses. For this
reason, it is alwas possible to describe the extent of a procedure with the start_ip and end_ip members. If a single function/routine is
split into multiple, discontiguous pieces, libunwind will treat each piece as a separate procedure.
RETURN VALUE
On successful completion, unw_get_proc_info() returns 0. Otherwise the negative value of one of the error-codes below is returned.
THREAD AND SIGNAL SAFETY
unw_get_proc_info() is thread-safe. If cursor cp is in the local address-space, this routine is also safe to use from a signal handler.
ERRORS
UNW_EUNSPEC
An unspecified error occurred.
UNW_ENOINFO
Libunwind was unable to locate unwind-info for the procedure.
UNW_EBADVERSION
The unwind-info for the procedure has version or format that is not understood by libunwind.
In addition, unw_get_proc_info() may return any error returned by the access_mem() call-back (see unw_create_addr_space(3)).
SEE ALSO libunwind(3), unw_create_addr_space(3), unw_get_proc_name(3)AUTHOR
David Mosberger-Tang
Email: dmosberger@gmail.com
WWW: http://www.nongnu.org/libunwind/.
Programming Library 16 August 2007 UNW_GET_PROC_INFO(3)