/* * signal.c * * Description: * POSIX thread-aware signal functions. */ #include <errno.h> #include "pthread.h" #include "implement.h" #if HAVE_SIGSET_T int pthread_sigmask(int how, const sigset_t *set, sigset_t *oset) { pthread_t thread = pthread_self(); /* Validate the `how' argument.*/ if (set != NULL) { switch (how) { case SIG_BLOCK: break; case SIG_UNBLOCK: break; case SIG_SETMASK: break; default: /* Invalid `how' argument. */ return EINVAL; } } /* Copy the old mask before modifying it. */ if (oset != NULL) { memcpy(oset, &(thread->attr.sigmask), sizeof(sigset_t)); } if (set != NULL) { int i; /* FIXME: this code assumes that sigmask is an even multiple of the size of a long integer. */ unsigned long *src = (long *) set; unsigned long *dest = &(thread->attr.sigmask); switch (how) { case SIG_BLOCK: for (i = 0; i < (sizeof(sigset_t) / sizeof(unsigned long)); i++) { /* OR the bit field longword-wise. */ *src++ |= *dest++; } break; case SIG_UNBLOCK: for (i = 0; i < (sizeof(sigset_t) / sizeof(unsigned long)); i++) { /* XOR the bitfield longword-wise. */ *src++ ^= *dest++; } case SIG_SETMASK: /* Replace the whole sigmask. */ memcpy(&(thread->attr.sigmask), set, sizeof(sigset_t)); break; } } return 0; } #endif /* HAVE_SIGSET_T */