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/* Implementation of wait
Copyright (C) 1994, 1995, 1996, 2001 Free Software Foundation
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2, or (at
your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <mach.h>
#include <sys/types.h>
#include <hurd/hurd_types.h>
#include <sys/resource.h>
#include "proc.h"
#include <signal.h>
#include <string.h>
#include <sys/wait.h>
#include <errno.h>
#include <stdlib.h>
#include <assert.h>
#include "process_S.h"
#include <mach/mig_errors.h>
#define EWOULDBLOCK EAGAIN /* XXX */
/* Return nonzero if a `waitpid' on WAIT_PID by a process
in MYPGRP cares about the death of PID/PGRP. */
static inline int
waiter_cares (pid_t wait_pid, pid_t mypgrp,
pid_t pid, pid_t pgrp)
{
return (wait_pid == pid ||
wait_pid == -pgrp ||
wait_pid == WAIT_ANY ||
(wait_pid == WAIT_MYPGRP && pgrp == mypgrp));
}
/* A process is dying. Send SIGCHLD to the parent. Wake the parent
if it is waiting for us to exit. */
void
alert_parent (struct proc *p)
{
send_signal (p->p_parent->p_msgport, SIGCHLD, p->p_parent->p_task);
if (!p->p_exiting)
{
p->p_status = W_EXITCODE (0, SIGKILL);
p->p_sigcode = -1;
}
if (p->p_parent->p_waiting)
{
condition_broadcast (&p->p_parent->p_wakeup);
p->p_parent->p_waiting = 0;
}
}
kern_return_t
S_proc_wait (struct proc *p,
mach_port_t reply_port,
mach_msg_type_name_t reply_port_type,
pid_t pid,
int options,
int *status,
int *sigcode,
struct rusage *ru,
pid_t *pid_status)
{
int cancel;
int child_ready (struct proc *child)
{
if (child->p_waited)
return 0;
if (child->p_dead)
return 1;
if (!child->p_stopped)
return 0;
if (child->p_traced || (options & WUNTRACED))
return 1;
return 0;
}
if (!p)
return EOPNOTSUPP;
start_over:
/* See if we can satisfy the request with a stopped
child; also check for invalid arguments here. */
if (!p->p_ochild)
return ECHILD;
if (pid > 0)
{
struct proc *child = pid_find_allow_zombie (pid);
if (!child || child->p_parent != p)
return ECHILD;
if (child_ready (child))
{
child->p_waited = 1;
*status = child->p_status;
*sigcode = child->p_sigcode;
if (child->p_dead)
complete_exit (child);
memset (ru, 0, sizeof (struct rusage));
*pid_status = pid;
return 0;
}
}
else
{
struct proc *child;
int had_a_match = pid == 0;
for (child = p->p_ochild; child; child = child->p_sib)
if (waiter_cares (pid, p->p_pgrp->pg_pgid,
child->p_pid, child->p_pgrp->pg_pgid))
{
had_a_match = 1;
if (child_ready (child))
{
child->p_waited = 1;
*status = child->p_status;
*sigcode = child->p_sigcode;
*pid_status = child->p_pid;
if (child->p_dead)
complete_exit (child);
memset (ru, 0, sizeof (struct rusage));
return 0;
}
}
if (!had_a_match)
return ECHILD;
}
if (options & WNOHANG)
return EWOULDBLOCK;
p->p_waiting = 1;
cancel = hurd_condition_wait (&p->p_wakeup, &global_lock);
if (p->p_dead)
return EOPNOTSUPP;
if (cancel)
return EINTR;
goto start_over;
}
/* Implement proc_mark_stop as described in <hurd/process.defs>. */
kern_return_t
S_proc_mark_stop (struct proc *p,
int signo,
int sigcode)
{
if (!p)
return EOPNOTSUPP;
p->p_stopped = 1;
p->p_status = W_STOPCODE (signo);
p->p_sigcode = sigcode;
p->p_waited = 0;
if (p->p_parent->p_waiting)
{
condition_broadcast (&p->p_parent->p_wakeup);
p->p_parent->p_waiting = 0;
}
if (!p->p_parent->p_nostopcld)
send_signal (p->p_parent->p_msgport, SIGCHLD, p->p_parent->p_task);
return 0;
}
/* Implement proc_mark_exit as described in <hurd/process.defs>. */
kern_return_t
S_proc_mark_exit (struct proc *p,
int status,
int sigcode)
{
if (!p)
return EOPNOTSUPP;
if (WIFSTOPPED (status))
return EINVAL;
p->p_exiting = 1;
p->p_status = status;
p->p_sigcode = sigcode;
return 0;
}
/* Implement proc_mark_cont as described in <hurd/process.defs>. */
kern_return_t
S_proc_mark_cont (struct proc *p)
{
if (!p)
return EOPNOTSUPP;
p->p_stopped = 0;
return 0;
}
/* Implement proc_mark_traced as described in <hurd/process.defs>. */
kern_return_t
S_proc_mark_traced (struct proc *p)
{
if (!p)
return EOPNOTSUPP;
p->p_traced = 1;
return 0;
}
/* Implement proc_mark_nostopchild as described in <hurd/process.defs>. */
kern_return_t
S_proc_mod_stopchild (struct proc *p,
int value)
{
if (!p)
return EOPNOTSUPP;
/* VALUE is nonzero if we should send SIGCHLD. */
p->p_nostopcld = ! value;
return 0;
}
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