| xf.li | bfc6e71 | 2025-02-07 01:54:34 -0800 | [diff] [blame^] | 1 | /* Copyright (C) 1993-2016 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. |
| 3 | |
| 4 | The GNU C Library is free software; you can redistribute it and/or |
| 5 | modify it under the terms of the GNU Lesser General Public |
| 6 | License as published by the Free Software Foundation; either |
| 7 | version 2.1 of the License, or (at your option) any later version. |
| 8 | |
| 9 | The GNU C Library is distributed in the hope that it will be useful, |
| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | Lesser General Public License for more details. |
| 13 | |
| 14 | You should have received a copy of the GNU Lesser General Public |
| 15 | License along with the GNU C Library; if not, see |
| 16 | <http://www.gnu.org/licenses/>. */ |
| 17 | |
| 18 | #include <sys/types.h> |
| 19 | #include <sys/wait.h> |
| 20 | #include <errno.h> |
| 21 | #include <hurd.h> |
| 22 | #include <hurd/port.h> |
| 23 | |
| 24 | pid_t |
| 25 | __wait4 (pid_t pid, __WAIT_STATUS_DEFN stat_loc, int options, |
| 26 | struct rusage *usage) |
| 27 | { |
| 28 | pid_t dead; |
| 29 | error_t err; |
| 30 | struct rusage ignored; |
| 31 | int sigcode; |
| 32 | int dummy; |
| 33 | |
| 34 | err = __USEPORT (PROC, __proc_wait (port, pid, options, |
| 35 | stat_loc ?: &dummy, &sigcode, |
| 36 | usage ?: &ignored, &dead)); |
| 37 | switch (err) |
| 38 | { |
| 39 | case 0: /* Got a child. */ |
| 40 | return dead; |
| 41 | case EAGAIN: |
| 42 | /* The RPC returns this error when the WNOHANG flag is set and no |
| 43 | selected children are dead (but some are living). In that |
| 44 | situation, our return value is zero. (The RPC can't return zero |
| 45 | for DEAD without also returning some garbage for the other out |
| 46 | parameters, so an error return is much more natural here. Hence |
| 47 | the difference between the RPC and the POSIX.1 interface. */ |
| 48 | return (pid_t) 0; |
| 49 | default: |
| 50 | return (pid_t) __hurd_fail (err); |
| 51 | } |
| 52 | } |
| 53 | |
| 54 | weak_alias (__wait4, wait4) |