kern/include/err.h

   1 /* Plan9 style error popping.  For details, read Documentation/plan9.txt */
   2
   3 #ifndef ROS_KERN_ERR_H
   4 #define ROS_KERN_ERR_H
   5
   6 #include <setjmp.h>
   7 #include <syscall.h>
   8
   9 struct errbuf {
  10         struct jmpbuf jmpbuf;
  11 };
  12
  13 #define ERRSTACK(x) struct errbuf *prev_errbuf; struct errbuf errstack[(x)];   \
  14                     int curindex = 0;
  15 #define waserror() (errpush(errstack, ARRAY_SIZE(errstack), &curindex,         \
  16                             &prev_errbuf) ||                                   \
  17                     setjmp(&(get_cur_errbuf()->jmpbuf)))
  18 #define error(x,...) {set_errstr(x, ##__VA_ARGS__);                            \
  19                       longjmp(&get_cur_errbuf()->jmpbuf, 1);}
  20 #define nexterror() {errpop(errstack, ARRAY_SIZE(errstack), &curindex,         \
  21                             prev_errbuf);                                      \
  22                      longjmp(&(get_cur_errbuf())->jmpbuf, 1);}
  23 #define poperror() {errpop(errstack, ARRAY_SIZE(errstack), &curindex,          \
  24                            prev_errbuf);}
  25
  26 int errpush(struct errbuf *errstack, int stacksize, int *curindex,
  27             struct errbuf **prev_errbuf);
  28 void errpop(struct errbuf *errstack, int stacksize, int *curindex,
  29             struct errbuf *prev_errbuf);
  30
  31 #endif /* ROS_KERN_ERR_H */