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const errno_t ESOMETHINGREALLYBAD = 1;

errno_t g(void) {
  /* ... */
  if (something_really_bad_happens) {
    return ESOMETHINGREALLYBAD;
  }
  /* ... */
  return 0;
}

errno_t f(void) {
  errno_t status = g();
  if ((status = g()) != 0)
    return status;
  /* ... do the rest of f ... */
  return 0;
}

#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 ((err = setjmp(exception_env));
if (err != 0) {
  /* if we get here, an error occurred
     and err indicates what went wrong */
}
/* ... */
f();
/* if we get here, no errors occurred */
/* ... */