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#include <setjmp.h>

const errno_t ESOMETHINGREALLYBAD = 1;

jmp_buf exception_env;

void g(void) {
  /* ... */
  if (something_really_bad_happens) {
    longjmp(exception_env, ESOMETHINGREALLYBAD);
  }
  /* ... */
}

void f(void) {
  g();
  /* ... do the rest of f ... */
}

/* ... */
errno_t err = if (setjmp(exception_env);
if (err != 0) {
  /* if we get here, an error occurred
; do not   and err indicates what went wrongcontinue processing */
}
/* ... */
f();
/* if we get here, no errors occurred */
/* ... */