diff options
Diffstat (limited to 'libbb/xfuncs_printf.c')
| -rw-r--r-- | libbb/xfuncs_printf.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/libbb/xfuncs_printf.c b/libbb/xfuncs_printf.c index 842d10cd2..d413c81e8 100644 --- a/libbb/xfuncs_printf.c +++ b/libbb/xfuncs_printf.c @@ -696,6 +696,14 @@ pid_t FAST_FUNC xfork(void) } #endif +#if 0 +/* DO NOT DO THIS. This can't be a function. + * It works on some arches (x86) but fails on others (ppc64le: SEGV). + * The reason is: the child returns from this function + * and likely pops up the stack in an arch-dependent way. + * When child eventually exits or execs, parent "reappear" + * in the now-unwound stack (!) and the behavior is undefined. + */ void FAST_FUNC xvfork_parent_waits_and_exits(void) { pid_t pid; @@ -711,6 +719,7 @@ void FAST_FUNC xvfork_parent_waits_and_exits(void) } /* Child continues */ } +#endif // Useful when we do know that pid is valid, and we just want to wait // for it to exit. Not existing pid is fatal. waitpid() status is not returned. |