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/* Implementation of waitid. Hurd version.
Copyright (C) 1997-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Zack Weinberg <zack@rabi.phys.columbia.edu>, 1997.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <stddef.h>
#include <hurd.h>
#include <hurd/port.h>
#include <hurd/version.h>
#include <sysdep-cancel.h>
int
__waitid (idtype_t idtype, id_t id, siginfo_t *infop, int options)
{
struct rusage ignored;
error_t err;
pid_t pid, child;
int sigcode;
int status;
int cancel_oldtype;
switch (idtype)
{
case P_PID:
if (id <= 0)
goto invalid;
pid = (pid_t) id;
break;
case P_PGID:
if (id < 0 || id == 1)
goto invalid;
pid = (pid_t) -id;
break;
case P_ALL:
pid = -1;
break;
default:
invalid:
__set_errno (EINVAL);
return -1;
}
/* Technically we're supposed to return EFAULT if infop is bogus,
but that would involve mucking with signals, which is
too much hassle. User will have to deal with SIGSEGV/SIGBUS.
We just check for a null pointer. */
if (infop == NULL)
{
__set_errno (EFAULT);
return -1;
}
cancel_oldtype = LIBC_CANCEL_ASYNC();
#if HURD_INTERFACE_VERSION >= 20201227
err = __USEPORT_CANCEL (PROC, __proc_waitid (port, pid, options,
&status, &sigcode,
&ignored, &child));
if (err == MIG_BAD_ID || err == EOPNOTSUPP)
#endif
err = __USEPORT_CANCEL (PROC, __proc_wait (port, pid, options,
&status, &sigcode,
&ignored, &child));
LIBC_CANCEL_RESET (cancel_oldtype);
if (err == EAGAIN)
{
/* POSIX.1-2008, Technical Corrigendum 1 XSH/TC1-2008/0713 [153] states
that if waitid returns because WNOHANG was specified and status is
not available for any process specified by idtype and id, then the
si_signo and si_pid members of the structure pointed to by infop
shall be set to zero. */
infop->si_signo = 0;
infop->si_code = 0;
return 0;
}
if (err != 0)
return __hurd_fail (err);
/* Decode the status field and set infop members... */
infop->si_signo = SIGCHLD;
infop->si_pid = child;
infop->si_errno = 0;
if (WIFEXITED (status))
{
infop->si_code = CLD_EXITED;
infop->si_status = WEXITSTATUS (status);
}
else if (WIFSIGNALED (status))
{
infop->si_code = WCOREDUMP (status) ? CLD_DUMPED : CLD_KILLED;
infop->si_status = WTERMSIG (status);
}
else if (WIFSTOPPED (status))
{
infop->si_code = CLD_STOPPED;
infop->si_status = WSTOPSIG (status);
}
else if (WIFCONTINUED (status))
{
infop->si_code = CLD_CONTINUED;
infop->si_status = SIGCONT;
}
return 0;
}
weak_alias (__waitid, waitid)
strong_alias (__waitid, __libc_waitid)
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