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/* ISC license. */
/* MT-unsafe */
#include <errno.h>
#include <signal.h>
#include <skalibs/sig.h>
#include <skalibs/nsig.h>
static struct skasigaction skasigstack[NSIG][SIGSTACKSIZE] ;
static unsigned int sigsp[NSIG] ;
int sig_pusha (int sig, struct skasigaction const *ssa)
{
if ((sig <= 0) || (sig > NSIG)) return (errno = EINVAL, -1) ;
if (sigsp[sig-1] >= SIGSTACKSIZE) return (errno = ENOBUFS, -1) ;
if (skasigaction(sig, ssa, &skasigstack[sig-1][sigsp[sig-1]]) == -1)
return -1 ;
return ++sigsp[sig-1] ;
}
int sig_pop (int sig)
{
if ((sig <= 0) || (sig > NSIG)) return (errno = EINVAL, -1) ;
if (!sigsp[sig-1]) return (errno = EFAULT, -1);
if (skasigaction(sig, &skasigstack[sig-1][sigsp[sig-1]-1], 0) == -1)
return -1 ;
return --sigsp[sig-1] ;
}
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