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/ usr/ src/ courier-0.66.1/ waitlib/ - drwxrwxrwx

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/*
** Copyright 2000-2006 Double Precision, Inc.
** See COPYING for distribution information.
*/

#include    "config.h"
#include    "waitlib.h"
#include    <stdlib.h>
#include    <sys/types.h>
#include    <string.h>
#include    <signal.h>
#if    HAVE_UNISTD_H
#include    <unistd.h>
#endif


static pid_t *static_pid_buf=0;

static void start_reaper(pid_t pid, int exit_stat)
{
}

static RETSIGTYPE start_reap(int signum)
{
    wait_reap(start_reaper, start_reap);

#if    RETSIGTYPE != void
    return (0);
#endif
}

void wait_forchild( void (*)(pid_t, int), /* Reaper */
        RETSIGTYPE (*)(int));   /* Signal handler stub */

int wait_startchildren(unsigned nchildren, pid_t **pidptr)
{
int    pipefd[2];
pid_t    p;
unsigned i;

    if (!pidptr)
    {
        if (static_pid_buf)    free(static_pid_buf);
        static_pid_buf=0;
        pidptr= &static_pid_buf;
    }

    if (*pidptr == 0 && (*pidptr=malloc(nchildren * sizeof(pid_t))) == 0)
        return (-1);

    if (pipe(pipefd) < 0)    return (-1);

    signal(SIGCHLD, start_reap);
    wait_block();
    for (i=0; i<nchildren; i++)
    {
        p=fork();
        if (p < 0)
        {
            while (i)
            {
                kill( (*pidptr)[--i], SIGKILL);
                wait_forchild(start_reaper, start_reap);
            }
            close(pipefd[0]);
            close(pipefd[1]);
            wait_clear(start_reap);
            signal(SIGCHLD, SIG_DFL);
            return (-1);
        }

        if (p == 0)
        {
        char    buf;

            wait_restore();
            close(pipefd[1]);
            if (read(pipefd[0], &buf, 1) != 1)
                exit(1);
            close(pipefd[0]);
            return (1);
        }

        (*pidptr)[i]=p;
    }
    wait_restore();
    close(pipefd[0]);
    for (i=0; i<nchildren; i++)
        if (write(pipefd[1], "", 1) < 0)
            ; /* Shut gcc up */
    close(pipefd[1]);
    return (0);
}

int wait_reforkchild(unsigned nchildren, pid_t *pidptr, pid_t pid)
{
unsigned i;

    for (i=0; i<nchildren; i++)
        if (pidptr[i] == pid)    break;

    if (i >= nchildren)    return (0);

    switch ((pidptr[i]=fork()))    {
    case 0:
        wait_restore();    /* Just in case */
        return (1);
    case -1:
        return (-1);
    default:
        break;
    }
    return (0);
}
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