| /* Copyright (C) 1993-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| 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 |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| #include <errno.h> |
| #include <hurd.h> |
| #include <hurd/port.h> |
| |
| pid_t |
| __wait4 (pid_t pid, __WAIT_STATUS_DEFN stat_loc, int options, |
| struct rusage *usage) |
| { |
| pid_t dead; |
| error_t err; |
| struct rusage ignored; |
| int sigcode; |
| int dummy; |
| |
| err = __USEPORT (PROC, __proc_wait (port, pid, options, |
| stat_loc ?: &dummy, &sigcode, |
| usage ?: &ignored, &dead)); |
| switch (err) |
| { |
| case 0: /* Got a child. */ |
| return dead; |
| case EAGAIN: |
| /* The RPC returns this error when the WNOHANG flag is set and no |
| selected children are dead (but some are living). In that |
| situation, our return value is zero. (The RPC can't return zero |
| for DEAD without also returning some garbage for the other out |
| parameters, so an error return is much more natural here. Hence |
| the difference between the RPC and the POSIX.1 interface. */ |
| return (pid_t) 0; |
| default: |
| return (pid_t) __hurd_fail (err); |
| } |
| } |
| |
| weak_alias (__wait4, wait4) |