mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-11 13:50:06 +00:00
146 lines
3.6 KiB
C
146 lines
3.6 KiB
C
/* Pseudo implementation of waitid.
|
|
Copyright (C) 1997, 1998, 2002 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, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
#include <assert.h>
|
|
#include <errno.h>
|
|
#include <signal.h>
|
|
#define __need_NULL
|
|
#include <stddef.h>
|
|
#include <sys/wait.h>
|
|
#include <sys/types.h>
|
|
#include <nptl/pthreadP.h>
|
|
#include <tls.h>
|
|
|
|
|
|
static int
|
|
do_waitid (idtype_t idtype, id_t id, siginfo_t *infop, int options)
|
|
{
|
|
pid_t pid, child;
|
|
int status;
|
|
|
|
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;
|
|
}
|
|
|
|
child = __waitpid (pid, &status, options);
|
|
|
|
if (child == -1)
|
|
/* `waitpid' set `errno' for us. */
|
|
return -1;
|
|
|
|
if (child == 0)
|
|
{
|
|
/* The WHOHANG bit in OPTIONS is set and there are children available
|
|
but none has a status for us. The XPG docs do not mention this
|
|
case so we clear the `siginfo_t' struct and return successfully. */
|
|
infop->si_signo = 0;
|
|
infop->si_code = 0;
|
|
return 0;
|
|
}
|
|
|
|
/* 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);
|
|
}
|
|
#ifdef WIFCONTINUED
|
|
else if (WIFCONTINUED (status))
|
|
{
|
|
infop->si_code = CLD_CONTINUED;
|
|
infop->si_status = SIGCONT;
|
|
}
|
|
#endif
|
|
else
|
|
/* Can't happen. */
|
|
assert (! "What?");
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
int
|
|
__waitid (idtype, id, infop, options)
|
|
idtype_t idtype;
|
|
id_t id;
|
|
siginfo_t *infop;
|
|
int options;
|
|
{
|
|
#ifndef NOT_IN_libc
|
|
if (__builtin_expect (THREAD_GETMEM (THREAD_SELF,
|
|
header.data.multiple_threads) == 0, 1))
|
|
return do_waitid (idtype, id, infop, options);
|
|
|
|
int oldtype = LIBC_CANCEL_ASYNC ();
|
|
#endif
|
|
|
|
int result = do_waitid (idtype, id, infop, options);
|
|
|
|
#ifndef NOT_IN_libc
|
|
LIBC_CANCEL_RESET (oldtype);
|
|
#endif
|
|
|
|
return result;
|
|
}
|
|
weak_alias (__waitid, waitid)
|
|
strong_alias (__waitid, __libc_waitid)
|