com32/include/setjmp.h

   1 /*
   2  * setjmp.h
   3  */
   4
   5 #ifndef _SETJMP_H
   6 #define _SETJMP_H
   7
   8 #include <klibc/extern.h>
   9 #include <klibc/compiler.h>
  10 #include <stddef.h>
  11 #include <signal.h>
  12
  13 #include <klibc/archsetjmp.h>
  14
  15 __extern int setjmp(jmp_buf);
  16 __extern __noreturn longjmp(jmp_buf, int);
  17
  18 /*
  19   Whose bright idea was it to add unrelated functionality to just about
  20   the only function in the standard C library (setjmp) which cannot be
  21   wrapped by an ordinary function wrapper?  Anyway, the damage is done,
  22   and therefore, this wrapper *must* be inline.  However, gcc will
  23   complain if this is an inline function for unknown reason, and
  24   therefore sigsetjmp() needs to be a macro.
  25 */
  26
  27 struct __sigjmp_buf {
  28   jmp_buf __jmpbuf;
  29   sigset_t __sigs;
  30 };
  31
  32 typedef struct __sigjmp_buf sigjmp_buf[1];
  33
  34 #define sigsetjmp(__env, __save) \
  35 ({ \
  36   struct __sigjmp_buf *__e = (__env); \
  37   sigprocmask(0, NULL, &__e->__sigs); \
  38   setjmp(__e->__jmpbuf); \
  39 })
  40
  41 __extern __noreturn siglongjmp(sigjmp_buf, int);
  42
  43 #endif /* _SETJMP_H */