[2b1de7]: signal.c Maximize Restore History

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signal.c    73 lines (63 with data), 1.4 kB

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/*
* signal.c
*
* Description:
* Thread-aware signal functions.
*/
#include "pthread.h"
#include "implement.h"
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;
}