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/*
** Copyright 1998 - 2005 Double Precision, Inc.
** See COPYING for distribution information.
*/

#ifndef    INCLUDED_FROM_CONFIGURE
#include    "waitlib.h"
#endif
#include    <signal.h>
#include    <stdio.h>


#if    HAVE_SIGPROCMASK

#define HOLD_CHILDREN {\
    sigset_t ss; sigemptyset(&ss); sigaddset(&ss, SIGCHLD); \
    sigprocmask(SIG_BLOCK, &ss, NULL);\
    }

#define RELEASE_CHILDREN {\
    sigset_t ss; sigemptyset(&ss); sigaddset(&ss, SIGCHLD); \
    sigprocmask(SIG_UNBLOCK, &ss, NULL);\
    }

#else
#if    HAVE_SIGHOLD

#define    HOLD_CHILDREN    sighold(SIGCHLD)
#define    RELEASE_CHILDREN    sigrelse(SIGCHLD)

#else

#define    HOLD_CHILDREN    sigblock(sigmask(SIGCHLD))
#define    RELEASE_CHILDREN    sigsetmask(0)

#endif
#endif

#if    USE_WAIT3

void wait_block()
{
    HOLD_CHILDREN;
}

void wait_clear(RETSIGTYPE (*func)(int))
{
    RELEASE_CHILDREN;
}

void wait_restore()
{
    signal(SIGCHLD, SIG_DFL);
    RELEASE_CHILDREN;
}

#else

void wait_block()
{
    signal(SIGCHLD, SIG_DFL);
}

void wait_clear(RETSIGTYPE (*func)(int))
{
    signal(SIGCHLD, func);
}

void wait_restore()
{
    signal(SIGCHLD, SIG_DFL);
}

#endif

void wait_reap( void (*func)(pid_t, int), RETSIGTYPE (*handler)(int))
{
int    dummy;
pid_t    p;

#if    USE_WAIT3

    HOLD_CHILDREN;

    while ((p=wait3(&dummy, WNOHANG, 0)) > 0)
#else
    if ((p=wait(&dummy)) > 0)
#endif
    {
        (*func)(p, dummy);
    }

    signal(SIGCHLD, handler);

#if    USE_WAIT3
    RELEASE_CHILDREN;
#endif

}

void wait_forchild( void (*reap)(pid_t, int), RETSIGTYPE (*func)(int))
{
pid_t    p;
int    wait_stat;

    signal(SIGCHLD, SIG_DFL);
    p=wait(&wait_stat);
    signal(SIGCHLD, func);
    (*reap)(p, wait_stat);
}

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