c++ - Retrieving sigcontext during backtrace -

in writing code print backtraces in c++, came across this answer, includes copying definition of type:

/* structure mirrors 1 found in /usr/include/asm/ucontext.h */ typedef struct _sig_ucontext {  unsigned long     uc_flags;  struct ucontext   *uc_link;  stack_t           uc_stack;  struct sigcontext uc_mcontext;  sigset_t          uc_sigmask; } sig_ucontext_t; 

i can't include <asm/ucontext.h> since there defined ucontext collides named type <sys/ucontext.h> (which included necessary <signal.h>):

/* userlevel context.  */ typedef struct ucontext   {     unsigned long int uc_flags;     struct ucontext *uc_link;     stack_t uc_stack;     mcontext_t uc_mcontext;     __sigset_t uc_sigmask;     struct _libc_fpstate __fpregs_mem;   } ucontext_t; 

all need here struct sigcontext uc_mcontext member asm version. there better way retrieve value copying out struct? seems incredibly hackish , error-prone me.

one potential workaround make asm/ucontext.h first include in source file , abuse preprocessor rename conflicting definition:

#define ucontext asm_ucontext #include <asm/ucontext.h> #undef asm_ucontext 

you can use asm_ucontext refer alternative definition of ucontext.

a bit less hacky approach employ sed automatically extract necessary definitions system file:

$ echo '#include <asm/ucontext.h>' | gcc -x c - -e -o- | sed -n '/^struct ucontext/,/^};/{ s/ucontext/asm_ucontext/; p}' | tee asm_ucontext.h struct asm_ucontext {   unsigned long uc_flags;   struct asm_ucontext *uc_link;   stack_t uc_stack;   struct sigcontext uc_mcontext;   sigset_t uc_sigmask; };