diff options
Diffstat (limited to 'libc/signal/sigaction.c')
| -rw-r--r-- | libc/signal/sigaction.c | 19 |
1 files changed, 13 insertions, 6 deletions
diff --git a/libc/signal/sigaction.c b/libc/signal/sigaction.c index 221951eeb..f430070e6 100644 --- a/libc/signal/sigaction.c +++ b/libc/signal/sigaction.c @@ -43,25 +43,32 @@ __libc_sigaction (int sig, const struct sigaction *act, struct sigaction *oact) { int result; struct kernel_sigaction kact, koact; + enum { + /* We try hard to actually have them equal, + * but just for paranoid reasons, be safe */ + SIGSET_MIN_SIZE = sizeof(kact.sa_mask) < sizeof(act->sa_mask) + ? sizeof(kact.sa_mask) : sizeof(act->sa_mask) + }; if (act) { kact.k_sa_handler = act->sa_handler; - memcpy (&kact.sa_mask, &act->sa_mask, sizeof (sigset_t)); + memcpy (&kact.sa_mask, &act->sa_mask, SIGSET_MIN_SIZE); kact.sa_flags = act->sa_flags; # ifdef HAVE_SA_RESTORER kact.sa_restorer = act->sa_restorer; # endif } - /* XXX The size argument hopefully will have to be changed to the - real size of the user-level sigset_t. */ + /* NB: kernel (as of 2.6.25) will return EINVAL + * if sizeof(kact.sa_mask) does not match kernel's sizeof(sigset_t) */ result = __syscall_rt_sigaction(sig, - act ? __ptrvalue (&kact) : NULL, - oact ? __ptrvalue (&koact) : NULL, _NSIG / 8); + act ? __ptrvalue (&kact) : NULL, + oact ? __ptrvalue (&koact) : NULL, + sizeof(kact.sa_mask)); if (oact && result >= 0) { oact->sa_handler = koact.k_sa_handler; - memcpy (&oact->sa_mask, &koact.sa_mask, sizeof (sigset_t)); + memcpy (&oact->sa_mask, &koact.sa_mask, SIGSET_MIN_SIZE); oact->sa_flags = koact.sa_flags; # ifdef HAVE_SA_RESTORER oact->sa_restorer = koact.sa_restorer; |