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/* sigset.c - signal set manipulation functions */

/* Copyright 2002, Red Hat Inc. */

/* Note: these are currently grouped together in one file so that

         it will override the default version in the libc/unix

         directory which has grouped all functions in one file. */

/* sigaddset function */

#include <signal.h>

#include <bits/sigset.h>

#include <errno.h>

#include <string.h>

#include <machine/weakalias.h>

int

sigaddset (sigset_t *set, const int signo)

{

  int index, mask;

  __sigset_t *st = (__sigset_t *)set;

  if (signo > NSIG)

    {

      errno = EINVAL;

      return -1;

    }

  index = (signo - 1) / (8 * sizeof(long));

  mask = 1 << ((signo - 1) % (8 * sizeof(long)));

  st->__val[index] |= mask;

  return 0;

}

/* sigdelset function */

int

sigdelset (sigset_t *set, const int signo)

{

  int index, mask;

  __sigset_t *st = (__sigset_t *)set;

  if (signo > NSIG)

    {

      errno = EINVAL;

      return -1;

    }

  index = (signo - 1) / (8 * sizeof(long));

  mask = 1 << ((signo - 1) % (8 * sizeof(long)));

  st->__val[index] &= ~mask;

  return 0;

}

/* sigemptyset function */

int

sigemptyset (sigset_t *set)

{

  int size = NSIG / 8;

  __sigset_t *st = (__sigset_t *)set;

  memset (st->__val, 0, size);

  return 0;

}

/* sigfillset function */

int

sigfillset (sigset_t *set)

{

  int size = NSIG / 8;

  __sigset_t *st = (__sigset_t *)set;

  memset (st->__val, 0xff, size);

  return 0;

}

/* sigismember function */

int

sigismember (const sigset_t *set, int signo)

{

  int index, mask;

  __sigset_t *st = (__sigset_t *)set;

  if (signo > NSIG)

    {

      errno = EINVAL;

      return -1;

    }

  index = (signo - 1) / (8 * sizeof(long));

  mask = 1 << ((signo - 1) % (8 * sizeof(long)));

  return (st->__val[index] & mask) != 0;

}