diff options
Diffstat (limited to 'libc/sysdeps/linux/xtensa/sigaction.c')
| -rw-r--r-- | libc/sysdeps/linux/xtensa/sigaction.c | 29 |
1 files changed, 18 insertions, 11 deletions
diff --git a/libc/sysdeps/linux/xtensa/sigaction.c b/libc/sysdeps/linux/xtensa/sigaction.c index 790a8f21f..c6c24fc36 100644 --- a/libc/sysdeps/linux/xtensa/sigaction.c +++ b/libc/sysdeps/linux/xtensa/sigaction.c @@ -20,14 +20,18 @@ extern void __default_sa_restorer (void); /* Experimentally off - libc_hidden_proto(memcpy) */ int __libc_sigaction (int signum, const struct sigaction *act, - struct sigaction *oldact) + struct sigaction *oact) { - struct kernel_sigaction kact, koldact; + struct kernel_sigaction kact, koact; int result; + enum { + 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 (kact.sa_mask)); + memcpy(&kact.sa_mask, &act->sa_mask, SIGSET_MIN_SIZE); kact.sa_flags = act->sa_flags; if (kact.sa_flags & SA_RESTORER) { @@ -38,15 +42,18 @@ int __libc_sigaction (int signum, const struct sigaction *act, } } - result = __syscall_rt_sigaction(signum, act ? __ptrvalue (&kact) : NULL, - oldact ? __ptrvalue (&koldact) : NULL, - _NSIG / 8); + /* 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(signum, + act ? __ptrvalue (&kact) : NULL, + oact ? __ptrvalue (&koact) : NULL, + sizeof(kact.sa_mask)); - if (oldact && result >= 0) { - oldact->sa_handler = koldact.k_sa_handler; - memcpy(&oldact->sa_mask, &koldact.sa_mask, sizeof(oldact->sa_mask)); - oldact->sa_flags = koldact.sa_flags; - oldact->sa_restorer = koldact.sa_restorer; + if (oact && result >= 0) { + oact->sa_handler = koact.k_sa_handler; + memcpy(&oact->sa_mask, &koact.sa_mask, SIGSET_MIN_SIZE); + oact->sa_flags = koact.sa_flags; + oact->sa_restorer = koact.sa_restorer; } return result; |